diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c index e6bbed4ba836..54870b0153c9 100644 --- a/sys/amd64/linux/linux_sysvec.c +++ b/sys/amd64/linux/linux_sysvec.c @@ -1,944 +1,940 @@ /*- * Copyright (c) 2013 Dmitry Chagin * Copyright (c) 2004 Tim J. Robbins * Copyright (c) 2003 Peter Wemm * Copyright (c) 2002 Doug Rabson * Copyright (c) 1998-1999 Andrew Gallatin * Copyright (c) 1994-1996 Søren Schmidt * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #define __ELF_WORD_SIZE 64 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_VERSION(linux64, 1); -const char *linux_kplatform; static int linux_szsigcode; static vm_object_t linux_shared_page_obj; static char *linux_shared_page_mapping; extern char _binary_linux_locore_o_start; extern char _binary_linux_locore_o_end; extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base); static int linux_fixup_elf(uintptr_t *stack_base, struct image_params *iparams); static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); static void linux_vdso_install(void *param); static void linux_vdso_deinstall(void *param); static void linux_set_syscall_retval(struct thread *td, int error); static int linux_fetch_syscall_args(struct thread *td); static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack); static int linux_vsyscall(struct thread *td); #define LINUX_T_UNKNOWN 255 static int _bsd_to_linux_trapcode[] = { LINUX_T_UNKNOWN, /* 0 */ 6, /* 1 T_PRIVINFLT */ LINUX_T_UNKNOWN, /* 2 */ 3, /* 3 T_BPTFLT */ LINUX_T_UNKNOWN, /* 4 */ LINUX_T_UNKNOWN, /* 5 */ 16, /* 6 T_ARITHTRAP */ 254, /* 7 T_ASTFLT */ LINUX_T_UNKNOWN, /* 8 */ 13, /* 9 T_PROTFLT */ 1, /* 10 T_TRCTRAP */ LINUX_T_UNKNOWN, /* 11 */ 14, /* 12 T_PAGEFLT */ LINUX_T_UNKNOWN, /* 13 */ 17, /* 14 T_ALIGNFLT */ LINUX_T_UNKNOWN, /* 15 */ LINUX_T_UNKNOWN, /* 16 */ LINUX_T_UNKNOWN, /* 17 */ 0, /* 18 T_DIVIDE */ 2, /* 19 T_NMI */ 4, /* 20 T_OFLOW */ 5, /* 21 T_BOUND */ 7, /* 22 T_DNA */ 8, /* 23 T_DOUBLEFLT */ 9, /* 24 T_FPOPFLT */ 10, /* 25 T_TSSFLT */ 11, /* 26 T_SEGNPFLT */ 12, /* 27 T_STKFLT */ 18, /* 28 T_MCHK */ 19, /* 29 T_XMMFLT */ 15 /* 30 T_RESERVED */ }; #define bsd_to_linux_trapcode(code) \ ((code)td_proc; frame = td->td_frame; sa = &td->td_sa; sa->args[0] = frame->tf_rdi; sa->args[1] = frame->tf_rsi; sa->args[2] = frame->tf_rdx; sa->args[3] = frame->tf_rcx; sa->args[4] = frame->tf_r8; sa->args[5] = frame->tf_r9; sa->code = frame->tf_rax; if (sa->code >= p->p_sysent->sv_size) /* nosys */ sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; else sa->callp = &p->p_sysent->sv_table[sa->code]; td->td_retval[0] = 0; return (0); } static void linux_set_syscall_retval(struct thread *td, int error) { struct trapframe *frame; frame = td->td_frame; switch (error) { case 0: frame->tf_rax = td->td_retval[0]; frame->tf_r10 = frame->tf_rcx; break; case ERESTART: /* * Reconstruct pc, we know that 'syscall' is 2 bytes, * lcall $X,y is 7 bytes, int 0x80 is 2 bytes. * We saved this in tf_err. * */ frame->tf_rip -= frame->tf_err; frame->tf_r10 = frame->tf_rcx; break; case EJUSTRETURN: break; default: frame->tf_rax = bsd_to_linux_errno(error); frame->tf_r10 = frame->tf_rcx; break; } /* * Differently from FreeBSD native ABI, on Linux only %rcx * and %r11 values are not preserved across the syscall. * Require full context restore to get all registers except * those two restored at return to usermode. * * XXX: Would be great to be able to avoid PCB_FULL_IRET * for the error == 0 case. */ set_pcb_flags(td->td_pcb, PCB_FULL_IRET); } static int linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) { Elf_Auxargs *args; Elf_Auxinfo *argarray, *pos; struct proc *p; int error, issetugid; p = imgp->proc; args = (Elf64_Auxargs *)imgp->auxargs; argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, M_WAITOK | M_ZERO); issetugid = p->p_flag & P_SUGID ? 1 : 0; AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, imgp->proc->p_sysent->sv_shared_page_base); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); AUXARGS_ENTRY(pos, AT_PHENT, args->phent); AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); AUXARGS_ENTRY(pos, AT_BASE, args->base); AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); if (imgp->execpathp != 0) AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); if (args->execfd != -1) AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); AUXARGS_ENTRY(pos, AT_NULL, 0); free(imgp->auxargs, M_TEMP); imgp->auxargs = NULL; KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); error = copyout(argarray, (void *)base, sizeof(*argarray) * LINUX_AT_COUNT); free(argarray, M_TEMP); return (error); } static int linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) { Elf_Addr *base; base = (Elf64_Addr *)*stack_base; base--; if (suword(base, (uint64_t)imgp->args->argc) == -1) return (EFAULT); *stack_base = (uintptr_t)base; return (0); } /* * Copy strings out to the new process address space, constructing new arg * and env vector tables. Return a pointer to the base so that it can be used * as the initial stack pointer. */ static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) { int argc, envc, error; char **vectp; char *stringp; uintptr_t destp, ustringp; struct ps_strings *arginfo; char canary[LINUX_AT_RANDOM_LEN]; size_t execpath_len; struct proc *p; p = imgp->proc; arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); destp = (uintptr_t)arginfo; if (imgp->execpath != NULL && imgp->auxargs != NULL) { execpath_len = strlen(imgp->execpath) + 1; destp -= execpath_len; destp = rounddown2(destp, sizeof(void *)); imgp->execpathp = (void *)destp; error = copyout(imgp->execpath, imgp->execpathp, execpath_len); if (error != 0) return (error); } /* Prepare the canary for SSP. */ arc4rand(canary, sizeof(canary), 0); destp -= roundup(sizeof(canary), sizeof(void *)); imgp->canary = (void *)destp; error = copyout(canary, imgp->canary, sizeof(canary)); if (error != 0) return (error); /* Allocate room for the argument and environment strings. */ destp -= ARG_MAX - imgp->args->stringspace; destp = rounddown2(destp, sizeof(void *)); ustringp = destp; if (imgp->auxargs) { /* * Allocate room on the stack for the ELF auxargs * array. It has LINUX_AT_COUNT entries. */ destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo); destp = rounddown2(destp, sizeof(void *)); } vectp = (char **)destp; /* * Allocate room for the argv[] and env vectors including the * terminating NULL pointers. */ vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; /* * Starting with 2.24, glibc depends on a 16-byte stack alignment. * One "long argc" will be prepended later. */ vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8); /* vectp also becomes our initial stack base. */ *stack_base = (uintptr_t)vectp; stringp = imgp->args->begin_argv; argc = imgp->args->argc; envc = imgp->args->envc; /* Copy out strings - arguments and environment. */ error = copyout(stringp, (void *)ustringp, ARG_MAX - imgp->args->stringspace); if (error != 0) return (error); /* Fill in "ps_strings" struct for ps, w, etc. */ if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || suword(&arginfo->ps_nargvstr, argc) != 0) return (EFAULT); /* Fill in argument portion of vector table. */ for (; argc > 0; --argc) { if (suword(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* A null vector table pointer separates the argp's from the envp's. */ if (suword(vectp++, 0) != 0) return (EFAULT); if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || suword(&arginfo->ps_nenvstr, envc) != 0) return (EFAULT); /* Fill in environment portion of vector table. */ for (; envc > 0; --envc) { if (suword(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* The end of the vector table is a null pointer. */ if (suword(vectp, 0) != 0) return (EFAULT); if (imgp->auxargs) { vectp++; error = imgp->sysent->sv_copyout_auxargs(imgp, (uintptr_t)vectp); if (error != 0) return (error); } return (0); } /* * Reset registers to default values on exec. */ static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) { struct trapframe *regs; struct pcb *pcb; register_t saved_rflags; regs = td->td_frame; pcb = td->td_pcb; if (td->td_proc->p_md.md_ldt != NULL) user_ldt_free(td); pcb->pcb_fsbase = 0; pcb->pcb_gsbase = 0; clear_pcb_flags(pcb, PCB_32BIT); pcb->pcb_initial_fpucw = __LINUX_NPXCW__; set_pcb_flags(pcb, PCB_FULL_IRET); saved_rflags = regs->tf_rflags & PSL_T; bzero((char *)regs, sizeof(struct trapframe)); regs->tf_rip = imgp->entry_addr; regs->tf_rsp = stack; regs->tf_rflags = PSL_USER | saved_rflags; regs->tf_ss = _udatasel; regs->tf_cs = _ucodesel; regs->tf_ds = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _ufssel; regs->tf_gs = _ugssel; regs->tf_flags = TF_HASSEGS; x86_clear_dbregs(pcb); /* * Drop the FP state if we hold it, so that the process gets a * clean FP state if it uses the FPU again. */ fpstate_drop(td); } /* * Copied from amd64/amd64/machdep.c * * XXX fpu state need? don't think so */ int linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) { struct proc *p; struct l_ucontext uc; struct l_sigcontext *context; struct trapframe *regs; unsigned long rflags; int error; ksiginfo_t ksi; regs = td->td_frame; error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc)); if (error != 0) return (error); p = td->td_proc; context = &uc.uc_mcontext; rflags = context->sc_rflags; /* * Don't allow users to change privileged or reserved flags. */ /* * XXX do allow users to change the privileged flag PSL_RF. * The cpu sets PSL_RF in tf_rflags for faults. Debuggers * should sometimes set it there too. tf_rflags is kept in * the signal context during signal handling and there is no * other place to remember it, so the PSL_RF bit may be * corrupted by the signal handler without us knowing. * Corruption of the PSL_RF bit at worst causes one more or * one less debugger trap, so allowing it is fairly harmless. */ if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { uprintf("pid %d comm %s linux mangled rflags %#lx\n", p->p_pid, p->p_comm, rflags); return (EINVAL); } /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ if (!CS_SECURE(context->sc_cs)) { uprintf("pid %d comm %s linux mangled cs %#x\n", p->p_pid, p->p_comm, context->sc_cs); ksiginfo_init_trap(&ksi); ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; ksi.ksi_trapno = T_PROTFLT; ksi.ksi_addr = (void *)regs->tf_rip; trapsignal(td, &ksi); return (EINVAL); } PROC_LOCK(p); linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask); SIG_CANTMASK(td->td_sigmask); signotify(td); PROC_UNLOCK(p); regs->tf_rdi = context->sc_rdi; regs->tf_rsi = context->sc_rsi; regs->tf_rdx = context->sc_rdx; regs->tf_rbp = context->sc_rbp; regs->tf_rbx = context->sc_rbx; regs->tf_rcx = context->sc_rcx; regs->tf_rax = context->sc_rax; regs->tf_rip = context->sc_rip; regs->tf_rsp = context->sc_rsp; regs->tf_r8 = context->sc_r8; regs->tf_r9 = context->sc_r9; regs->tf_r10 = context->sc_r10; regs->tf_r11 = context->sc_r11; regs->tf_r12 = context->sc_r12; regs->tf_r13 = context->sc_r13; regs->tf_r14 = context->sc_r14; regs->tf_r15 = context->sc_r15; regs->tf_cs = context->sc_cs; regs->tf_err = context->sc_err; regs->tf_rflags = rflags; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); return (EJUSTRETURN); } /* * copied from amd64/amd64/machdep.c * * Send an interrupt to process. */ static void linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct l_rt_sigframe sf, *sfp; struct proc *p; struct thread *td; struct sigacts *psp; caddr_t sp; struct trapframe *regs; int sig, code; int oonstack; td = curthread; p = td->td_proc; PROC_LOCK_ASSERT(p, MA_OWNED); sig = ksi->ksi_signo; psp = p->p_sigacts; code = ksi->ksi_code; mtx_assert(&psp->ps_mtx, MA_OWNED); regs = td->td_frame; oonstack = sigonstack(regs->tf_rsp); LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u", catcher, sig, mask, code); /* Save user context. */ bzero(&sf, sizeof(sf)); bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask); bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask); sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi; sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi; sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx; sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp; sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx; sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx; sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax; sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip; sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp; sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8; sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9; sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10; sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11; sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12; sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13; sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14; sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15; sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags; sf.sf_sc.uc_mcontext.sc_err = regs->tf_err; sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; /* Allocate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe); } else sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128; /* Align to 16 bytes. */ sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul); /* Translate the signal. */ sig = bsd_to_linux_signal(sig); /* Build the argument list for the signal handler. */ regs->tf_rdi = sig; /* arg 1 in %rdi */ regs->tf_rax = 0; regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */ /* Fill in POSIX parts. */ siginfo_to_lsiginfo(&ksi->ksi_info, &sf.sf_si, sig); sf.sf_handler = catcher; mtx_unlock(&psp->ps_mtx); PROC_UNLOCK(p); /* Copy the sigframe out to the user's stack. */ if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { PROC_LOCK(p); sigexit(td, SIGILL); } regs->tf_rsp = (long)sfp; regs->tf_rip = linux_rt_sigcode; regs->tf_rflags &= ~(PSL_T | PSL_D); regs->tf_cs = _ucodesel; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } #define LINUX_VSYSCALL_START (-10UL << 20) #define LINUX_VSYSCALL_SZ 1024 const unsigned long linux_vsyscall_vector[] = { LINUX_SYS_gettimeofday, LINUX_SYS_linux_time, LINUX_SYS_linux_getcpu, }; static int linux_vsyscall(struct thread *td) { struct trapframe *frame; uint64_t retqaddr; int code, traced; int error; frame = td->td_frame; /* Check %rip for vsyscall area. */ if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START)) return (EINVAL); if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0) return (EINVAL); code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ; if (code >= nitems(linux_vsyscall_vector)) return (EINVAL); /* * vsyscall called as callq *(%rax), so we must * use return address from %rsp and also fixup %rsp. */ error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr)); if (error) return (error); frame->tf_rip = retqaddr; frame->tf_rax = linux_vsyscall_vector[code]; frame->tf_rsp += 8; traced = (frame->tf_flags & PSL_T); amd64_syscall(td, traced); return (0); } struct sysentvec elf_linux_sysvec = { .sv_size = LINUX_SYS_MAXSYSCALL, .sv_table = linux_sysent, .sv_transtrap = linux_translate_traps, .sv_fixup = linux_fixup_elf, .sv_sendsig = linux_rt_sendsig, .sv_sigcode = &_binary_linux_locore_o_start, .sv_szsigcode = &linux_szsigcode, .sv_name = "Linux ELF64", .sv_coredump = elf64_coredump, .sv_elf_core_osabi = ELFOSABI_NONE, .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, .sv_elf_core_prepare_notes = elf64_prepare_notes, .sv_imgact_try = linux_exec_imgact_try, .sv_minsigstksz = LINUX_MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS_LA48, .sv_usrstack = USRSTACK_LA48, .sv_psstrings = PS_STRINGS_LA48, .sv_psstringssz = sizeof(struct ps_strings), .sv_stackprot = VM_PROT_ALL, .sv_copyout_auxargs = linux_copyout_auxargs, .sv_copyout_strings = linux_copyout_strings, .sv_setregs = linux_exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP | SV_SIG_DISCIGN | SV_SIG_WAITNDQ, .sv_set_syscall_retval = linux_set_syscall_retval, .sv_fetch_syscall_args = linux_fetch_syscall_args, .sv_syscallnames = NULL, .sv_shared_page_base = SHAREDPAGE_LA48, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = linux_schedtail, .sv_thread_detach = linux_thread_detach, .sv_trap = linux_vsyscall, .sv_onexec = linux_on_exec, .sv_onexit = linux_on_exit, .sv_ontdexit = linux_thread_dtor, .sv_setid_allowed = &linux_setid_allowed_query, }; static void linux_vdso_install(void *param) { amd64_lower_shared_page(&elf_linux_sysvec); linux_szsigcode = (&_binary_linux_locore_o_end - &_binary_linux_locore_o_start); if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) panic("Linux invalid vdso size\n"); __elfN(linux_vdso_fixup)(&elf_linux_sysvec); linux_shared_page_obj = __elfN(linux_shared_page_init) (&linux_shared_page_mapping); __elfN(linux_vdso_reloc)(&elf_linux_sysvec); bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, linux_szsigcode); elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; - - linux_kplatform = linux_shared_page_mapping + - (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); } SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, linux_vdso_install, NULL); static void linux_vdso_deinstall(void *param) { __elfN(linux_shared_page_fini)(linux_shared_page_obj, linux_shared_page_mapping); } SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, linux_vdso_deinstall, NULL); static char GNULINUX_ABI_VENDOR[] = "GNU"; static int GNULINUX_ABI_DESC = 0; static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel) { const Elf32_Word *desc; uintptr_t p; p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); desc = (const Elf32_Word *)p; if (desc[0] != GNULINUX_ABI_DESC) return (false); /* * For Linux we encode osrel using the Linux convention of * (version << 16) | (major << 8) | (minor) * See macro in linux_mib.h */ *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); return (true); } static Elf_Brandnote linux64_brandnote = { .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR), .hdr.n_descsz = 16, .hdr.n_type = 1, .vendor = GNULINUX_ABI_VENDOR, .flags = BN_TRANSLATE_OSREL, .trans_osrel = linux_trans_osrel }; static Elf64_Brandinfo linux_glibc2brand = { .brand = ELFOSABI_LINUX, .machine = EM_X86_64, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib64/ld-linux-x86-64.so.2", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux64_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; static Elf64_Brandinfo linux_glibc2brandshort = { .brand = ELFOSABI_LINUX, .machine = EM_X86_64, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib64/ld-linux.so.2", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux64_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; static Elf64_Brandinfo linux_muslbrand = { .brand = ELFOSABI_LINUX, .machine = EM_X86_64, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-musl-x86_64.so.1", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux64_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; Elf64_Brandinfo *linux_brandlist[] = { &linux_glibc2brand, &linux_glibc2brandshort, &linux_muslbrand, NULL }; static int linux64_elf_modevent(module_t mod, int type, void *data) { Elf64_Brandinfo **brandinfo; int error; struct linux_ioctl_handler **lihp; error = 0; switch(type) { case MOD_LOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf64_insert_brand_entry(*brandinfo) < 0) error = EINVAL; if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux_ioctl_register_handler(*lihp); stclohz = (stathz ? stathz : hz); if (bootverbose) printf("Linux x86-64 ELF exec handler installed\n"); } else printf("cannot insert Linux x86-64 ELF brand handler\n"); break; case MOD_UNLOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf64_brand_inuse(*brandinfo)) error = EBUSY; if (error == 0) { for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf64_remove_brand_entry(*brandinfo) < 0) error = EINVAL; } if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux_ioctl_unregister_handler(*lihp); if (bootverbose) printf("Linux ELF exec handler removed\n"); } else printf("Could not deinstall ELF interpreter entry\n"); break; default: return (EOPNOTSUPP); } return (error); } static moduledata_t linux64_elf_mod = { "linux64elf", linux64_elf_modevent, 0 }; DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); FEATURE(linux64, "Linux 64bit support"); diff --git a/sys/amd64/linux32/linux32_sysvec.c b/sys/amd64/linux32/linux32_sysvec.c index cce0c8261a84..2670f9ff7b83 100644 --- a/sys/amd64/linux32/linux32_sysvec.c +++ b/sys/amd64/linux32/linux32_sysvec.c @@ -1,1105 +1,1101 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2004 Tim J. Robbins * Copyright (c) 2003 Peter Wemm * Copyright (c) 2002 Doug Rabson * Copyright (c) 1998-1999 Andrew Gallatin * Copyright (c) 1994-1996 Søren Schmidt * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "opt_compat.h" #include __FBSDID("$FreeBSD$"); #ifndef COMPAT_FREEBSD32 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" #endif #define __ELF_WORD_SIZE 32 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_VERSION(linux, 1); -const char *linux_kplatform; static int linux_szsigcode; static vm_object_t linux_shared_page_obj; static char *linux_shared_page_mapping; extern char _binary_linux32_locore_o_start; extern char _binary_linux32_locore_o_end; extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); static int linux_fixup_elf(uintptr_t *stack_base, struct image_params *iparams); static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base); static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack); static void linux32_fixlimit(struct rlimit *rl, int which); static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); static void linux_vdso_install(void *param); static void linux_vdso_deinstall(void *param); static void linux32_set_syscall_retval(struct thread *td, int error); #define LINUX_T_UNKNOWN 255 static int _bsd_to_linux_trapcode[] = { LINUX_T_UNKNOWN, /* 0 */ 6, /* 1 T_PRIVINFLT */ LINUX_T_UNKNOWN, /* 2 */ 3, /* 3 T_BPTFLT */ LINUX_T_UNKNOWN, /* 4 */ LINUX_T_UNKNOWN, /* 5 */ 16, /* 6 T_ARITHTRAP */ 254, /* 7 T_ASTFLT */ LINUX_T_UNKNOWN, /* 8 */ 13, /* 9 T_PROTFLT */ 1, /* 10 T_TRCTRAP */ LINUX_T_UNKNOWN, /* 11 */ 14, /* 12 T_PAGEFLT */ LINUX_T_UNKNOWN, /* 13 */ 17, /* 14 T_ALIGNFLT */ LINUX_T_UNKNOWN, /* 15 */ LINUX_T_UNKNOWN, /* 16 */ LINUX_T_UNKNOWN, /* 17 */ 0, /* 18 T_DIVIDE */ 2, /* 19 T_NMI */ 4, /* 20 T_OFLOW */ 5, /* 21 T_BOUND */ 7, /* 22 T_DNA */ 8, /* 23 T_DOUBLEFLT */ 9, /* 24 T_FPOPFLT */ 10, /* 25 T_TSSFLT */ 11, /* 26 T_SEGNPFLT */ 12, /* 27 T_STKFLT */ 18, /* 28 T_MCHK */ 19, /* 29 T_XMMFLT */ 15 /* 30 T_RESERVED */ }; #define bsd_to_linux_trapcode(code) \ ((code)auxargs; argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, M_WAITOK | M_ZERO); issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux32_vsyscall); AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, imgp->proc->p_sysent->sv_shared_page_base); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); /* * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, * as it has appeared in the 2.4.0-rc7 first time. * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), * glibc falls back to the hard-coded CLK_TCK value when aux entry * is not present. * Also see linux_times() implementation. */ if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); AUXARGS_ENTRY(pos, AT_PHENT, args->phent); AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); AUXARGS_ENTRY(pos, AT_BASE, args->base); AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); if (imgp->execpathp != 0) AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); if (args->execfd != -1) AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); AUXARGS_ENTRY(pos, AT_NULL, 0); free(imgp->auxargs, M_TEMP); imgp->auxargs = NULL; KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); error = copyout(argarray, (void *)base, sizeof(*argarray) * LINUX_AT_COUNT); free(argarray, M_TEMP); return (error); } static int linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) { Elf32_Addr *base; base = (Elf32_Addr *)*stack_base; base--; if (suword32(base, (uint32_t)imgp->args->argc) == -1) return (EFAULT); *stack_base = (uintptr_t)base; return (0); } static void linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct thread *td = curthread; struct proc *p = td->td_proc; struct sigacts *psp; struct trapframe *regs; struct l_rt_sigframe *fp, frame; int oonstack; int sig; int code; sig = ksi->ksi_signo; code = ksi->ksi_code; PROC_LOCK_ASSERT(p, MA_OWNED); psp = p->p_sigacts; mtx_assert(&psp->ps_mtx, MA_OWNED); regs = td->td_frame; oonstack = sigonstack(regs->tf_rsp); /* Allocate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); } else fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; mtx_unlock(&psp->ps_mtx); /* Build the argument list for the signal handler. */ sig = bsd_to_linux_signal(sig); bzero(&frame, sizeof(frame)); frame.sf_handler = PTROUT(catcher); frame.sf_sig = sig; frame.sf_siginfo = PTROUT(&fp->sf_si); frame.sf_ucontext = PTROUT(&fp->sf_sc); /* Fill in POSIX parts. */ siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); /* * Build the signal context to be used by sigreturn and libgcc unwind. */ frame.sf_sc.uc_flags = 0; /* XXX ??? */ frame.sf_sc.uc_link = 0; /* XXX ??? */ frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; PROC_UNLOCK(p); bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); if (copyout(&frame, fp, sizeof(frame)) != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ PROC_LOCK(p); sigexit(td, SIGILL); } /* Build context to run handler in. */ regs->tf_rsp = PTROUT(fp); regs->tf_rip = linux32_rt_sigcode; regs->tf_rflags &= ~(PSL_T | PSL_D); regs->tf_cs = _ucode32sel; regs->tf_ss = _udatasel; regs->tf_ds = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _ufssel; regs->tf_gs = _ugssel; regs->tf_flags = TF_HASSEGS; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * in u. to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct thread *td = curthread; struct proc *p = td->td_proc; struct sigacts *psp; struct trapframe *regs; struct l_sigframe *fp, frame; l_sigset_t lmask; int oonstack; int sig, code; sig = ksi->ksi_signo; code = ksi->ksi_code; PROC_LOCK_ASSERT(p, MA_OWNED); psp = p->p_sigacts; mtx_assert(&psp->ps_mtx, MA_OWNED); if (SIGISMEMBER(psp->ps_siginfo, sig)) { /* Signal handler installed with SA_SIGINFO. */ linux_rt_sendsig(catcher, ksi, mask); return; } regs = td->td_frame; oonstack = sigonstack(regs->tf_rsp); /* Allocate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - sizeof(struct l_sigframe)); } else fp = (struct l_sigframe *)regs->tf_rsp - 1; mtx_unlock(&psp->ps_mtx); PROC_UNLOCK(p); /* Build the argument list for the signal handler. */ sig = bsd_to_linux_signal(sig); bzero(&frame, sizeof(frame)); frame.sf_handler = PTROUT(catcher); frame.sf_sig = sig; bsd_to_linux_sigset(mask, &lmask); /* Build the signal context to be used by sigreturn. */ frame.sf_sc.sc_mask = lmask.__mask; frame.sf_sc.sc_gs = regs->tf_gs; frame.sf_sc.sc_fs = regs->tf_fs; frame.sf_sc.sc_es = regs->tf_es; frame.sf_sc.sc_ds = regs->tf_ds; frame.sf_sc.sc_edi = regs->tf_rdi; frame.sf_sc.sc_esi = regs->tf_rsi; frame.sf_sc.sc_ebp = regs->tf_rbp; frame.sf_sc.sc_ebx = regs->tf_rbx; frame.sf_sc.sc_esp = regs->tf_rsp; frame.sf_sc.sc_edx = regs->tf_rdx; frame.sf_sc.sc_ecx = regs->tf_rcx; frame.sf_sc.sc_eax = regs->tf_rax; frame.sf_sc.sc_eip = regs->tf_rip; frame.sf_sc.sc_cs = regs->tf_cs; frame.sf_sc.sc_eflags = regs->tf_rflags; frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; frame.sf_sc.sc_ss = regs->tf_ss; frame.sf_sc.sc_err = regs->tf_err; frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); frame.sf_extramask[0] = lmask.__mask; if (copyout(&frame, fp, sizeof(frame)) != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ PROC_LOCK(p); sigexit(td, SIGILL); } /* Build context to run handler in. */ regs->tf_rsp = PTROUT(fp); regs->tf_rip = linux32_sigcode; regs->tf_rflags &= ~(PSL_T | PSL_D); regs->tf_cs = _ucode32sel; regs->tf_ss = _udatasel; regs->tf_ds = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _ufssel; regs->tf_gs = _ugssel; regs->tf_flags = TF_HASSEGS; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. */ int linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) { struct l_sigframe frame; struct trapframe *regs; sigset_t bmask; l_sigset_t lmask; int eflags; ksiginfo_t ksi; regs = td->td_frame; /* * The trampoline code hands us the sigframe. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ if (copyin(args->sfp, &frame, sizeof(frame)) != 0) return (EFAULT); /* Check for security violations. */ eflags = frame.sf_sc.sc_eflags; if (!EFL_SECURE(eflags, regs->tf_rflags)) return(EINVAL); /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ if (!CS_SECURE(frame.sf_sc.sc_cs)) { ksiginfo_init_trap(&ksi); ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; ksi.ksi_trapno = T_PROTFLT; ksi.ksi_addr = (void *)regs->tf_rip; trapsignal(td, &ksi); return(EINVAL); } lmask.__mask = frame.sf_sc.sc_mask; lmask.__mask = frame.sf_extramask[0]; linux_to_bsd_sigset(&lmask, &bmask); kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); /* Restore signal context. */ regs->tf_rdi = frame.sf_sc.sc_edi; regs->tf_rsi = frame.sf_sc.sc_esi; regs->tf_rbp = frame.sf_sc.sc_ebp; regs->tf_rbx = frame.sf_sc.sc_ebx; regs->tf_rdx = frame.sf_sc.sc_edx; regs->tf_rcx = frame.sf_sc.sc_ecx; regs->tf_rax = frame.sf_sc.sc_eax; regs->tf_rip = frame.sf_sc.sc_eip; regs->tf_cs = frame.sf_sc.sc_cs; regs->tf_ds = frame.sf_sc.sc_ds; regs->tf_es = frame.sf_sc.sc_es; regs->tf_fs = frame.sf_sc.sc_fs; regs->tf_gs = frame.sf_sc.sc_gs; regs->tf_rflags = eflags; regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; regs->tf_ss = frame.sf_sc.sc_ss; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); return (EJUSTRETURN); } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by rt_sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. */ int linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) { struct l_ucontext uc; struct l_sigcontext *context; sigset_t bmask; l_stack_t *lss; stack_t ss; struct trapframe *regs; int eflags; ksiginfo_t ksi; regs = td->td_frame; /* * The trampoline code hands us the ucontext. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ if (copyin(args->ucp, &uc, sizeof(uc)) != 0) return (EFAULT); context = &uc.uc_mcontext; /* Check for security violations. */ eflags = context->sc_eflags; if (!EFL_SECURE(eflags, regs->tf_rflags)) return(EINVAL); /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ if (!CS_SECURE(context->sc_cs)) { ksiginfo_init_trap(&ksi); ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; ksi.ksi_trapno = T_PROTFLT; ksi.ksi_addr = (void *)regs->tf_rip; trapsignal(td, &ksi); return(EINVAL); } linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); /* * Restore signal context */ regs->tf_gs = context->sc_gs; regs->tf_fs = context->sc_fs; regs->tf_es = context->sc_es; regs->tf_ds = context->sc_ds; regs->tf_rdi = context->sc_edi; regs->tf_rsi = context->sc_esi; regs->tf_rbp = context->sc_ebp; regs->tf_rbx = context->sc_ebx; regs->tf_rdx = context->sc_edx; regs->tf_rcx = context->sc_ecx; regs->tf_rax = context->sc_eax; regs->tf_rip = context->sc_eip; regs->tf_cs = context->sc_cs; regs->tf_rflags = eflags; regs->tf_rsp = context->sc_esp_at_signal; regs->tf_ss = context->sc_ss; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); /* * call sigaltstack & ignore results.. */ lss = &uc.uc_stack; ss.ss_sp = PTRIN(lss->ss_sp); ss.ss_size = lss->ss_size; ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); (void)kern_sigaltstack(td, &ss, NULL); return (EJUSTRETURN); } static int linux32_fetch_syscall_args(struct thread *td) { struct proc *p; struct trapframe *frame; struct syscall_args *sa; p = td->td_proc; frame = td->td_frame; sa = &td->td_sa; sa->args[0] = frame->tf_rbx; sa->args[1] = frame->tf_rcx; sa->args[2] = frame->tf_rdx; sa->args[3] = frame->tf_rsi; sa->args[4] = frame->tf_rdi; sa->args[5] = frame->tf_rbp; /* Unconfirmed */ sa->code = frame->tf_rax; if (sa->code >= p->p_sysent->sv_size) /* nosys */ sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; else sa->callp = &p->p_sysent->sv_table[sa->code]; td->td_retval[0] = 0; td->td_retval[1] = frame->tf_rdx; return (0); } static void linux32_set_syscall_retval(struct thread *td, int error) { struct trapframe *frame = td->td_frame; cpu_set_syscall_retval(td, error); if (__predict_false(error != 0)) { if (error != ERESTART && error != EJUSTRETURN) frame->tf_rax = bsd_to_linux_errno(error); } } /* * Clear registers on exec * XXX copied from ia32_signal.c. */ static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) { struct trapframe *regs = td->td_frame; struct pcb *pcb = td->td_pcb; register_t saved_rflags; regs = td->td_frame; pcb = td->td_pcb; if (td->td_proc->p_md.md_ldt != NULL) user_ldt_free(td); critical_enter(); wrmsr(MSR_FSBASE, 0); wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ pcb->pcb_fsbase = 0; pcb->pcb_gsbase = 0; critical_exit(); pcb->pcb_initial_fpucw = __LINUX_NPXCW__; saved_rflags = regs->tf_rflags & PSL_T; bzero((char *)regs, sizeof(struct trapframe)); regs->tf_rip = imgp->entry_addr; regs->tf_rsp = stack; regs->tf_rflags = PSL_USER | saved_rflags; regs->tf_gs = _ugssel; regs->tf_fs = _ufssel; regs->tf_es = _udatasel; regs->tf_ds = _udatasel; regs->tf_ss = _udatasel; regs->tf_flags = TF_HASSEGS; regs->tf_cs = _ucode32sel; regs->tf_rbx = (register_t)imgp->ps_strings; x86_clear_dbregs(pcb); fpstate_drop(td); /* Do full restore on return so that we can change to a different %cs */ set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); } /* * XXX copied from ia32_sysvec.c. */ static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) { int argc, envc, error; u_int32_t *vectp; char *stringp; uintptr_t destp, ustringp; struct linux32_ps_strings *arginfo; char canary[LINUX_AT_RANDOM_LEN]; size_t execpath_len; arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; destp = (uintptr_t)arginfo; if (imgp->execpath != NULL && imgp->auxargs != NULL) { execpath_len = strlen(imgp->execpath) + 1; destp -= execpath_len; destp = rounddown2(destp, sizeof(uint32_t)); imgp->execpathp = (void *)destp; error = copyout(imgp->execpath, imgp->execpathp, execpath_len); if (error != 0) return (error); } /* Prepare the canary for SSP. */ arc4rand(canary, sizeof(canary), 0); destp -= roundup(sizeof(canary), sizeof(uint32_t)); imgp->canary = (void *)destp; error = copyout(canary, imgp->canary, sizeof(canary)); if (error != 0) return (error); /* Allocate room for the argument and environment strings. */ destp -= ARG_MAX - imgp->args->stringspace; destp = rounddown2(destp, sizeof(uint32_t)); ustringp = destp; if (imgp->auxargs) { /* * Allocate room on the stack for the ELF auxargs * array. It has LINUX_AT_COUNT entries. */ destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); destp = rounddown2(destp, sizeof(uint32_t)); } vectp = (uint32_t *)destp; /* * Allocate room for the argv[] and env vectors including the * terminating NULL pointers. */ vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; /* vectp also becomes our initial stack base. */ *stack_base = (uintptr_t)vectp; stringp = imgp->args->begin_argv; argc = imgp->args->argc; envc = imgp->args->envc; /* Copy out strings - arguments and environment. */ error = copyout(stringp, (void *)ustringp, ARG_MAX - imgp->args->stringspace); if (error != 0) return (error); /* Fill in "ps_strings" struct for ps, w, etc. */ if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || suword32(&arginfo->ps_nargvstr, argc) != 0) return (EFAULT); /* Fill in argument portion of vector table. */ for (; argc > 0; --argc) { if (suword32(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* A null vector table pointer separates the argp's from the envp's. */ if (suword32(vectp++, 0) != 0) return (EFAULT); if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || suword32(&arginfo->ps_nenvstr, envc) != 0) return (EFAULT); /* Fill in environment portion of vector table. */ for (; envc > 0; --envc) { if (suword32(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* The end of the vector table is a null pointer. */ if (suword32(vectp, 0) != 0) return (EFAULT); if (imgp->auxargs) { vectp++; error = imgp->sysent->sv_copyout_auxargs(imgp, (uintptr_t)vectp); if (error != 0) return (error); } return (0); } static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "32-bit Linux emulation"); static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, &linux32_maxdsiz, 0, ""); static u_long linux32_maxssiz = LINUX32_MAXSSIZ; SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, &linux32_maxssiz, 0, ""); static u_long linux32_maxvmem = LINUX32_MAXVMEM; SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, &linux32_maxvmem, 0, ""); static void linux32_fixlimit(struct rlimit *rl, int which) { switch (which) { case RLIMIT_DATA: if (linux32_maxdsiz != 0) { if (rl->rlim_cur > linux32_maxdsiz) rl->rlim_cur = linux32_maxdsiz; if (rl->rlim_max > linux32_maxdsiz) rl->rlim_max = linux32_maxdsiz; } break; case RLIMIT_STACK: if (linux32_maxssiz != 0) { if (rl->rlim_cur > linux32_maxssiz) rl->rlim_cur = linux32_maxssiz; if (rl->rlim_max > linux32_maxssiz) rl->rlim_max = linux32_maxssiz; } break; case RLIMIT_VMEM: if (linux32_maxvmem != 0) { if (rl->rlim_cur > linux32_maxvmem) rl->rlim_cur = linux32_maxvmem; if (rl->rlim_max > linux32_maxvmem) rl->rlim_max = linux32_maxvmem; } break; } } struct sysentvec elf_linux_sysvec = { .sv_size = LINUX32_SYS_MAXSYSCALL, .sv_table = linux32_sysent, .sv_transtrap = linux_translate_traps, .sv_fixup = linux_fixup_elf, .sv_sendsig = linux_sendsig, .sv_sigcode = &_binary_linux32_locore_o_start, .sv_szsigcode = &linux_szsigcode, .sv_name = "Linux ELF32", .sv_coredump = elf32_coredump, .sv_elf_core_osabi = ELFOSABI_FREEBSD, .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, .sv_elf_core_prepare_notes = elf32_prepare_notes, .sv_imgact_try = linux_exec_imgact_try, .sv_minsigstksz = LINUX_MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = LINUX32_MAXUSER, .sv_usrstack = LINUX32_USRSTACK, .sv_psstrings = LINUX32_PS_STRINGS, .sv_psstringssz = sizeof(struct linux32_ps_strings), .sv_stackprot = VM_PROT_ALL, .sv_copyout_auxargs = linux_copyout_auxargs, .sv_copyout_strings = linux_copyout_strings, .sv_setregs = linux_exec_setregs, .sv_fixlimit = linux32_fixlimit, .sv_maxssiz = &linux32_maxssiz, .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | SV_SIG_DISCIGN | SV_SIG_WAITNDQ, .sv_set_syscall_retval = linux32_set_syscall_retval, .sv_fetch_syscall_args = linux32_fetch_syscall_args, .sv_syscallnames = NULL, .sv_shared_page_base = LINUX32_SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = linux_schedtail, .sv_thread_detach = linux_thread_detach, .sv_trap = NULL, .sv_onexec = linux_on_exec, .sv_onexit = linux_on_exit, .sv_ontdexit = linux_thread_dtor, .sv_setid_allowed = &linux_setid_allowed_query, }; static void linux_vdso_install(void *param) { linux_szsigcode = (&_binary_linux32_locore_o_end - &_binary_linux32_locore_o_start); if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) panic("Linux invalid vdso size\n"); __elfN(linux_vdso_fixup)(&elf_linux_sysvec); linux_shared_page_obj = __elfN(linux_shared_page_init) (&linux_shared_page_mapping); __elfN(linux_vdso_reloc)(&elf_linux_sysvec); bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, linux_szsigcode); elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; - - linux_kplatform = linux_shared_page_mapping + - (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); } SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, linux_vdso_install, NULL); static void linux_vdso_deinstall(void *param) { __elfN(linux_shared_page_fini)(linux_shared_page_obj, linux_shared_page_mapping); } SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, linux_vdso_deinstall, NULL); static char GNU_ABI_VENDOR[] = "GNU"; static int GNULINUX_ABI_DESC = 0; static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) { const Elf32_Word *desc; uintptr_t p; p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); desc = (const Elf32_Word *)p; if (desc[0] != GNULINUX_ABI_DESC) return (false); /* * For Linux we encode osrel using the Linux convention of * (version << 16) | (major << 8) | (minor) * See macro in linux_mib.h */ *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); return (true); } static Elf_Brandnote linux32_brandnote = { .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), .hdr.n_descsz = 16, /* XXX at least 16 */ .hdr.n_type = 1, .vendor = GNU_ABI_VENDOR, .flags = BN_TRANSLATE_OSREL, .trans_osrel = linux32_trans_osrel }; static Elf32_Brandinfo linux_brand = { .brand = ELFOSABI_LINUX, .machine = EM_386, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-linux.so.1", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux32_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; static Elf32_Brandinfo linux_glibc2brand = { .brand = ELFOSABI_LINUX, .machine = EM_386, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-linux.so.2", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux32_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; static Elf32_Brandinfo linux_muslbrand = { .brand = ELFOSABI_LINUX, .machine = EM_386, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-musl-i386.so.1", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux32_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; Elf32_Brandinfo *linux_brandlist[] = { &linux_brand, &linux_glibc2brand, &linux_muslbrand, NULL }; static int linux_elf_modevent(module_t mod, int type, void *data) { Elf32_Brandinfo **brandinfo; int error; struct linux_ioctl_handler **lihp; error = 0; switch(type) { case MOD_LOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf32_insert_brand_entry(*brandinfo) < 0) error = EINVAL; if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux32_ioctl_register_handler(*lihp); stclohz = (stathz ? stathz : hz); if (bootverbose) printf("Linux ELF exec handler installed\n"); } else printf("cannot insert Linux ELF brand handler\n"); break; case MOD_UNLOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf32_brand_inuse(*brandinfo)) error = EBUSY; if (error == 0) { for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf32_remove_brand_entry(*brandinfo) < 0) error = EINVAL; } if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux32_ioctl_unregister_handler(*lihp); if (bootverbose) printf("Linux ELF exec handler removed\n"); } else printf("Could not deinstall ELF interpreter entry\n"); break; default: return (EOPNOTSUPP); } return (error); } static moduledata_t linux_elf_mod = { "linuxelf", linux_elf_modevent, 0 }; DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); FEATURE(linux, "Linux 32bit support"); diff --git a/sys/arm64/linux/linux_sysvec.c b/sys/arm64/linux/linux_sysvec.c index 1051cd755883..5a2edcefac2c 100644 --- a/sys/arm64/linux/linux_sysvec.c +++ b/sys/arm64/linux/linux_sysvec.c @@ -1,581 +1,577 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1994-1996 Søren Schmidt * Copyright (c) 2018 Turing Robotic Industries Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef VFP #include #endif MODULE_VERSION(linux64elf, 1); -const char *linux_kplatform; static int linux_szsigcode; static vm_object_t linux_shared_page_obj; static char *linux_shared_page_mapping; extern char _binary_linux_locore_o_start; extern char _binary_linux_locore_o_end; extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base); static int linux_elf_fixup(uintptr_t *stack_base, struct image_params *iparams); static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); static void linux_vdso_install(const void *param); static void linux_vdso_deinstall(const void *param); static void linux_set_syscall_retval(struct thread *td, int error); static int linux_fetch_syscall_args(struct thread *td); static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack); /* DTrace init */ LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); /* DTrace probes */ LIN_SDT_PROBE_DEFINE2(sysvec, linux_translate_traps, todo, "int", "int"); LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo); LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo); LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo); LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sigreturn, todo); LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sendsig, todo); LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_install, todo); LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_deinstall, todo); /* LINUXTODO: do we have traps to translate? */ static int linux_translate_traps(int signal, int trap_code) { LIN_SDT_PROBE2(sysvec, linux_translate_traps, todo, signal, trap_code); return (signal); } LINUX_VDSO_SYM_CHAR(linux_platform); static int linux_fetch_syscall_args(struct thread *td) { struct proc *p; struct syscall_args *sa; register_t *ap; p = td->td_proc; ap = td->td_frame->tf_x; sa = &td->td_sa; sa->code = td->td_frame->tf_x[8]; /* LINUXTODO: generic syscall? */ if (sa->code >= p->p_sysent->sv_size) sa->callp = &p->p_sysent->sv_table[0]; else sa->callp = &p->p_sysent->sv_table[sa->code]; if (sa->callp->sy_narg > MAXARGS) panic("ARM64TODO: Could we have more than %d args?", MAXARGS); memcpy(sa->args, ap, MAXARGS * sizeof(register_t)); td->td_retval[0] = 0; return (0); } static void linux_set_syscall_retval(struct thread *td, int error) { td->td_retval[1] = td->td_frame->tf_x[1]; cpu_set_syscall_retval(td, error); if (__predict_false(error != 0)) { if (error != ERESTART && error != EJUSTRETURN) td->td_frame->tf_x[0] = bsd_to_linux_errno(error); } } static int linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) { Elf_Auxargs *args; Elf_Auxinfo *argarray, *pos; struct proc *p; int error, issetugid; LIN_SDT_PROBE0(sysvec, linux_copyout_auxargs, todo); p = imgp->proc; args = (Elf64_Auxargs *)imgp->auxargs; argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, M_WAITOK | M_ZERO); issetugid = p->p_flag & P_SUGID ? 1 : 0; AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, imgp->proc->p_sysent->sv_shared_page_base); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap); AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); AUXARGS_ENTRY(pos, AT_PHENT, args->phent); AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); AUXARGS_ENTRY(pos, AT_BASE, args->base); AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2); if (imgp->execpathp != 0) AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); if (args->execfd != -1) AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); AUXARGS_ENTRY(pos, AT_NULL, 0); free(imgp->auxargs, M_TEMP); imgp->auxargs = NULL; KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); error = copyout(argarray, (void *)base, sizeof(*argarray) * LINUX_AT_COUNT); free(argarray, M_TEMP); return (error); } static int linux_elf_fixup(uintptr_t *stack_base, struct image_params *imgp) { LIN_SDT_PROBE0(sysvec, linux_elf_fixup, todo); return (0); } /* * Copy strings out to the new process address space, constructing new arg * and env vector tables. Return a pointer to the base so that it can be used * as the initial stack pointer. * LINUXTODO: deduplicate against other linuxulator archs */ static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) { char **vectp; char *stringp; uintptr_t destp, ustringp; struct ps_strings *arginfo; char canary[LINUX_AT_RANDOM_LEN]; size_t execpath_len; struct proc *p; int argc, envc, error; p = imgp->proc; arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); destp = (uintptr_t)arginfo; if (imgp->execpath != NULL && imgp->auxargs != NULL) { execpath_len = strlen(imgp->execpath) + 1; destp -= execpath_len; destp = rounddown2(destp, sizeof(void *)); imgp->execpathp = (void *)destp; error = copyout(imgp->execpath, imgp->execpathp, execpath_len); if (error != 0) return (error); } /* Prepare the canary for SSP. */ arc4rand(canary, sizeof(canary), 0); destp -= roundup(sizeof(canary), sizeof(void *)); imgp->canary = (void *)destp; error = copyout(canary, imgp->canary, sizeof(canary)); if (error != 0) return (error); /* Allocate room for the argument and environment strings. */ destp -= ARG_MAX - imgp->args->stringspace; destp = rounddown2(destp, sizeof(void *)); ustringp = destp; if (imgp->auxargs) { /* * Allocate room on the stack for the ELF auxargs * array. It has up to LINUX_AT_COUNT entries. */ destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo); destp = rounddown2(destp, sizeof(void *)); } vectp = (char **)destp; /* * Allocate room for argc and the argv[] and env vectors including the * terminating NULL pointers. */ vectp -= 1 + imgp->args->argc + 1 + imgp->args->envc + 1; vectp = (char **)STACKALIGN(vectp); /* vectp also becomes our initial stack base. */ *stack_base = (uintptr_t)vectp; stringp = imgp->args->begin_argv; argc = imgp->args->argc; envc = imgp->args->envc; /* Copy out strings - arguments and environment. */ error = copyout(stringp, (void *)ustringp, ARG_MAX - imgp->args->stringspace); if (error != 0) return (error); /* Fill in "ps_strings" struct for ps, w, etc. */ if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || suword(&arginfo->ps_nargvstr, argc) != 0) return (EFAULT); if (suword(vectp++, argc) != 0) return (EFAULT); /* Fill in argument portion of vector table. */ for (; argc > 0; --argc) { if (suword(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* A null vector table pointer separates the argp's from the envp's. */ if (suword(vectp++, 0) != 0) return (EFAULT); if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || suword(&arginfo->ps_nenvstr, envc) != 0) return (EFAULT); /* Fill in environment portion of vector table. */ for (; envc > 0; --envc) { if (suword(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* The end of the vector table is a null pointer. */ if (suword(vectp, 0) != 0) return (EFAULT); if (imgp->auxargs) { vectp++; error = imgp->sysent->sv_copyout_auxargs(imgp, (uintptr_t)vectp); if (error != 0) return (error); } return (0); } /* * Reset registers to default values on exec. */ static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) { struct trapframe *regs = td->td_frame; struct pcb *pcb = td->td_pcb; /* LINUXTODO: validate */ LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo); memset(regs, 0, sizeof(*regs)); /* glibc start.S registers function pointer in x0 with atexit. */ regs->tf_sp = stack; #if 0 /* LINUXTODO: See if this is used. */ regs->tf_lr = imgp->entry_addr; #else regs->tf_lr = 0xffffffffffffffff; #endif regs->tf_elr = imgp->entry_addr; pcb->pcb_tpidr_el0 = 0; pcb->pcb_tpidrro_el0 = 0; WRITE_SPECIALREG(tpidrro_el0, 0); WRITE_SPECIALREG(tpidr_el0, 0); #ifdef VFP vfp_reset_state(td, pcb); #endif /* * Clear debug register state. It is not applicable to the new process. */ bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs)); } int linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) { /* LINUXTODO: implement */ LIN_SDT_PROBE0(sysvec, linux_rt_sigreturn, todo); return (EDOOFUS); } static void linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { /* LINUXTODO: implement */ LIN_SDT_PROBE0(sysvec, linux_rt_sendsig, todo); } struct sysentvec elf_linux_sysvec = { .sv_size = LINUX_SYS_MAXSYSCALL, .sv_table = linux_sysent, .sv_transtrap = linux_translate_traps, .sv_fixup = linux_elf_fixup, .sv_sendsig = linux_rt_sendsig, .sv_sigcode = &_binary_linux_locore_o_start, .sv_szsigcode = &linux_szsigcode, .sv_name = "Linux ELF64", .sv_coredump = elf64_coredump, .sv_elf_core_osabi = ELFOSABI_NONE, .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, .sv_elf_core_prepare_notes = elf64_prepare_notes, .sv_imgact_try = linux_exec_imgact_try, .sv_minsigstksz = LINUX_MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = USRSTACK, .sv_psstrings = PS_STRINGS, /* XXX */ .sv_psstringssz = sizeof(struct ps_strings), .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, .sv_copyout_auxargs = linux_copyout_auxargs, .sv_copyout_strings = linux_copyout_strings, .sv_setregs = linux_exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP | SV_SIG_DISCIGN | SV_SIG_WAITNDQ, .sv_set_syscall_retval = linux_set_syscall_retval, .sv_fetch_syscall_args = linux_fetch_syscall_args, .sv_syscallnames = NULL, .sv_shared_page_base = SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = linux_schedtail, .sv_thread_detach = linux_thread_detach, .sv_trap = NULL, .sv_hwcap = &elf_hwcap, .sv_hwcap2 = &elf_hwcap2, .sv_onexec = linux_on_exec, .sv_onexit = linux_on_exit, .sv_ontdexit = linux_thread_dtor, .sv_setid_allowed = &linux_setid_allowed_query, }; static void linux_vdso_install(const void *param) { linux_szsigcode = (&_binary_linux_locore_o_end - &_binary_linux_locore_o_start); if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) panic("invalid Linux VDSO size\n"); __elfN(linux_vdso_fixup)(&elf_linux_sysvec); linux_shared_page_obj = __elfN(linux_shared_page_init) (&linux_shared_page_mapping); __elfN(linux_vdso_reloc)(&elf_linux_sysvec); memcpy(linux_shared_page_mapping, elf_linux_sysvec.sv_sigcode, linux_szsigcode); elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; - - linux_kplatform = linux_shared_page_mapping + - (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); } SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, linux_vdso_install, NULL); static void linux_vdso_deinstall(const void *param) { LIN_SDT_PROBE0(sysvec, linux_vdso_deinstall, todo); __elfN(linux_shared_page_fini)(linux_shared_page_obj, linux_shared_page_mapping); } SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, linux_vdso_deinstall, NULL); static char GNU_ABI_VENDOR[] = "GNU"; static int GNU_ABI_LINUX = 0; /* LINUXTODO: deduplicate */ static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel) { const Elf32_Word *desc; uintptr_t p; p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); desc = (const Elf32_Word *)p; if (desc[0] != GNU_ABI_LINUX) return (false); *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); return (true); } static Elf_Brandnote linux64_brandnote = { .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), .hdr.n_descsz = 16, .hdr.n_type = 1, .vendor = GNU_ABI_VENDOR, .flags = BN_TRANSLATE_OSREL, .trans_osrel = linux_trans_osrel }; static Elf64_Brandinfo linux_glibc2brand = { .brand = ELFOSABI_LINUX, .machine = EM_AARCH64, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib64/ld-linux-x86-64.so.2", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux64_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; Elf64_Brandinfo *linux_brandlist[] = { &linux_glibc2brand, NULL }; static int linux64_elf_modevent(module_t mod, int type, void *data) { Elf64_Brandinfo **brandinfo; struct linux_ioctl_handler**lihp; int error; error = 0; switch(type) { case MOD_LOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf64_insert_brand_entry(*brandinfo) < 0) error = EINVAL; if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux_ioctl_register_handler(*lihp); stclohz = (stathz ? stathz : hz); if (bootverbose) printf("Linux arm64 ELF exec handler installed\n"); } break; case MOD_UNLOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf64_brand_inuse(*brandinfo)) error = EBUSY; if (error == 0) { for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf64_remove_brand_entry(*brandinfo) < 0) error = EINVAL; } if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux_ioctl_unregister_handler(*lihp); if (bootverbose) printf("Linux ELF exec handler removed\n"); } else printf("Could not deinstall ELF interpreter entry\n"); break; default: return (EOPNOTSUPP); } return (error); } static moduledata_t linux64_elf_mod = { "linux64elf", linux64_elf_modevent, 0 }; DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); FEATURE(linux64, "AArch64 Linux 64bit support"); diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c index a6e170f47435..117b36056760 100644 --- a/sys/compat/linux/linux_misc.c +++ b/sys/compat/linux/linux_misc.c @@ -1,2889 +1,2891 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2002 Doug Rabson * Copyright (c) 1994-1995 Søren Schmidt * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "opt_compat.h" #include #include #include #if defined(__i386__) #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef COMPAT_LINUX32 #include #include #else #include #include #endif #include #include #include #include #include #include #include #include #include #include int stclohz; /* Statistics clock frequency */ static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = { RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK, RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE, RLIMIT_MEMLOCK, RLIMIT_AS }; struct l_sysinfo { l_long uptime; /* Seconds since boot */ l_ulong loads[3]; /* 1, 5, and 15 minute load averages */ #define LINUX_SYSINFO_LOADS_SCALE 65536 l_ulong totalram; /* Total usable main memory size */ l_ulong freeram; /* Available memory size */ l_ulong sharedram; /* Amount of shared memory */ l_ulong bufferram; /* Memory used by buffers */ l_ulong totalswap; /* Total swap space size */ l_ulong freeswap; /* swap space still available */ l_ushort procs; /* Number of current processes */ l_ushort pads; l_ulong totalhigh; l_ulong freehigh; l_uint mem_unit; char _f[20-2*sizeof(l_long)-sizeof(l_int)]; /* padding */ }; struct l_pselect6arg { l_uintptr_t ss; l_size_t ss_len; }; static int linux_utimensat_lts_to_ts(struct l_timespec *, struct timespec *); #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) static int linux_utimensat_lts64_to_ts(struct l_timespec64 *, struct timespec *); #endif static int linux_common_utimensat(struct thread *, int, const char *, struct timespec *, int); static int linux_common_pselect6(struct thread *, l_int, l_fd_set *, l_fd_set *, l_fd_set *, struct timespec *, l_uintptr_t *); static int linux_common_ppoll(struct thread *, struct pollfd *, uint32_t, struct timespec *, l_sigset_t *, l_size_t); static int linux_pollin(struct thread *, struct pollfd *, struct pollfd *, u_int); static int linux_pollout(struct thread *, struct pollfd *, struct pollfd *, u_int); int linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args) { struct l_sysinfo sysinfo; int i, j; struct timespec ts; bzero(&sysinfo, sizeof(sysinfo)); getnanouptime(&ts); if (ts.tv_nsec != 0) ts.tv_sec++; sysinfo.uptime = ts.tv_sec; /* Use the information from the mib to get our load averages */ for (i = 0; i < 3; i++) sysinfo.loads[i] = averunnable.ldavg[i] * LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale; sysinfo.totalram = physmem * PAGE_SIZE; sysinfo.freeram = (u_long)vm_free_count() * PAGE_SIZE; /* * sharedram counts pages allocated to named, swap-backed objects such * as shared memory segments and tmpfs files. There is no cheap way to * compute this, so just leave the field unpopulated. Linux itself only * started setting this field in the 3.x timeframe. */ sysinfo.sharedram = 0; sysinfo.bufferram = 0; swap_pager_status(&i, &j); sysinfo.totalswap = i * PAGE_SIZE; sysinfo.freeswap = (i - j) * PAGE_SIZE; sysinfo.procs = nprocs; /* * Platforms supported by the emulation layer do not have a notion of * high memory. */ sysinfo.totalhigh = 0; sysinfo.freehigh = 0; sysinfo.mem_unit = 1; return (copyout(&sysinfo, args->info, sizeof(sysinfo))); } #ifdef LINUX_LEGACY_SYSCALLS int linux_alarm(struct thread *td, struct linux_alarm_args *args) { struct itimerval it, old_it; u_int secs; int error; secs = args->secs; /* * Linux alarm() is always successful. Limit secs to INT32_MAX / 2 * to match kern_setitimer()'s limit to avoid error from it. * * XXX. Linux limit secs to INT_MAX on 32 and does not limit on 64-bit * platforms. */ if (secs > INT32_MAX / 2) secs = INT32_MAX / 2; it.it_value.tv_sec = secs; it.it_value.tv_usec = 0; timevalclear(&it.it_interval); error = kern_setitimer(td, ITIMER_REAL, &it, &old_it); KASSERT(error == 0, ("kern_setitimer returns %d", error)); if ((old_it.it_value.tv_sec == 0 && old_it.it_value.tv_usec > 0) || old_it.it_value.tv_usec >= 500000) old_it.it_value.tv_sec++; td->td_retval[0] = old_it.it_value.tv_sec; return (0); } #endif int linux_brk(struct thread *td, struct linux_brk_args *args) { struct vmspace *vm = td->td_proc->p_vmspace; uintptr_t new, old; old = (uintptr_t)vm->vm_daddr + ctob(vm->vm_dsize); new = (uintptr_t)args->dsend; if ((caddr_t)new > vm->vm_daddr && !kern_break(td, &new)) td->td_retval[0] = (register_t)new; else td->td_retval[0] = (register_t)old; return (0); } #if defined(__i386__) /* XXX: what about amd64/linux32? */ int linux_uselib(struct thread *td, struct linux_uselib_args *args) { struct nameidata ni; struct vnode *vp; struct exec *a_out; vm_map_t map; vm_map_entry_t entry; struct vattr attr; vm_offset_t vmaddr; unsigned long file_offset; unsigned long bss_size; char *library; ssize_t aresid; int error; bool locked, opened, textset; a_out = NULL; vp = NULL; locked = false; textset = false; opened = false; if (!LUSECONVPATH(td)) { NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, args->library, td); error = namei(&ni); } else { LCONVPATHEXIST(td, args->library, &library); NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, library, td); error = namei(&ni); LFREEPATH(library); } if (error) goto cleanup; vp = ni.ni_vp; NDFREE(&ni, NDF_ONLY_PNBUF); /* * From here on down, we have a locked vnode that must be unlocked. * XXX: The code below largely duplicates exec_check_permissions(). */ locked = true; /* Executable? */ error = VOP_GETATTR(vp, &attr, td->td_ucred); if (error) goto cleanup; if ((vp->v_mount->mnt_flag & MNT_NOEXEC) || ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) { /* EACCESS is what exec(2) returns. */ error = ENOEXEC; goto cleanup; } /* Sensible size? */ if (attr.va_size == 0) { error = ENOEXEC; goto cleanup; } /* Can we access it? */ error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); if (error) goto cleanup; /* * XXX: This should use vn_open() so that it is properly authorized, * and to reduce code redundancy all over the place here. * XXX: Not really, it duplicates far more of exec_check_permissions() * than vn_open(). */ #ifdef MAC error = mac_vnode_check_open(td->td_ucred, vp, VREAD); if (error) goto cleanup; #endif error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL); if (error) goto cleanup; opened = true; /* Pull in executable header into exec_map */ error = vm_mmap(exec_map, (vm_offset_t *)&a_out, PAGE_SIZE, VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0); if (error) goto cleanup; /* Is it a Linux binary ? */ if (((a_out->a_magic >> 16) & 0xff) != 0x64) { error = ENOEXEC; goto cleanup; } /* * While we are here, we should REALLY do some more checks */ /* Set file/virtual offset based on a.out variant. */ switch ((int)(a_out->a_magic & 0xffff)) { case 0413: /* ZMAGIC */ file_offset = 1024; break; case 0314: /* QMAGIC */ file_offset = 0; break; default: error = ENOEXEC; goto cleanup; } bss_size = round_page(a_out->a_bss); /* Check various fields in header for validity/bounds. */ if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) { error = ENOEXEC; goto cleanup; } /* text + data can't exceed file size */ if (a_out->a_data + a_out->a_text > attr.va_size) { error = EFAULT; goto cleanup; } /* * text/data/bss must not exceed limits * XXX - this is not complete. it should check current usage PLUS * the resources needed by this library. */ PROC_LOCK(td->td_proc); if (a_out->a_text > maxtsiz || a_out->a_data + bss_size > lim_cur_proc(td->td_proc, RLIMIT_DATA) || racct_set(td->td_proc, RACCT_DATA, a_out->a_data + bss_size) != 0) { PROC_UNLOCK(td->td_proc); error = ENOMEM; goto cleanup; } PROC_UNLOCK(td->td_proc); /* * Prevent more writers. */ error = VOP_SET_TEXT(vp); if (error != 0) goto cleanup; textset = true; /* * Lock no longer needed */ locked = false; VOP_UNLOCK(vp); /* * Check if file_offset page aligned. Currently we cannot handle * misalinged file offsets, and so we read in the entire image * (what a waste). */ if (file_offset & PAGE_MASK) { /* Map text+data read/write/execute */ /* a_entry is the load address and is page aligned */ vmaddr = trunc_page(a_out->a_entry); /* get anon user mapping, read+write+execute */ error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0, &vmaddr, a_out->a_text + a_out->a_data, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0); if (error) goto cleanup; error = vn_rdwr(UIO_READ, vp, (void *)vmaddr, file_offset, a_out->a_text + a_out->a_data, UIO_USERSPACE, 0, td->td_ucred, NOCRED, &aresid, td); if (error != 0) goto cleanup; if (aresid != 0) { error = ENOEXEC; goto cleanup; } } else { /* * for QMAGIC, a_entry is 20 bytes beyond the load address * to skip the executable header */ vmaddr = trunc_page(a_out->a_entry); /* * Map it all into the process's space as a single * copy-on-write "data" segment. */ map = &td->td_proc->p_vmspace->vm_map; error = vm_mmap(map, &vmaddr, a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset); if (error) goto cleanup; vm_map_lock(map); if (!vm_map_lookup_entry(map, vmaddr, &entry)) { vm_map_unlock(map); error = EDOOFUS; goto cleanup; } entry->eflags |= MAP_ENTRY_VN_EXEC; vm_map_unlock(map); textset = false; } if (bss_size != 0) { /* Calculate BSS start address */ vmaddr = trunc_page(a_out->a_entry) + a_out->a_text + a_out->a_data; /* allocate some 'anon' space */ error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0, &vmaddr, bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0); if (error) goto cleanup; } cleanup: if (opened) { if (locked) VOP_UNLOCK(vp); locked = false; VOP_CLOSE(vp, FREAD, td->td_ucred, td); } if (textset) { if (!locked) { locked = true; VOP_LOCK(vp, LK_SHARED | LK_RETRY); } VOP_UNSET_TEXT_CHECKED(vp); } if (locked) VOP_UNLOCK(vp); /* Release the temporary mapping. */ if (a_out) kmap_free_wakeup(exec_map, (vm_offset_t)a_out, PAGE_SIZE); return (error); } #endif /* __i386__ */ #ifdef LINUX_LEGACY_SYSCALLS int linux_select(struct thread *td, struct linux_select_args *args) { l_timeval ltv; struct timeval tv0, tv1, utv, *tvp; int error; /* * Store current time for computation of the amount of * time left. */ if (args->timeout) { if ((error = copyin(args->timeout, <v, sizeof(ltv)))) goto select_out; utv.tv_sec = ltv.tv_sec; utv.tv_usec = ltv.tv_usec; if (itimerfix(&utv)) { /* * The timeval was invalid. Convert it to something * valid that will act as it does under Linux. */ utv.tv_sec += utv.tv_usec / 1000000; utv.tv_usec %= 1000000; if (utv.tv_usec < 0) { utv.tv_sec -= 1; utv.tv_usec += 1000000; } if (utv.tv_sec < 0) timevalclear(&utv); } microtime(&tv0); tvp = &utv; } else tvp = NULL; error = kern_select(td, args->nfds, args->readfds, args->writefds, args->exceptfds, tvp, LINUX_NFDBITS); if (error) goto select_out; if (args->timeout) { if (td->td_retval[0]) { /* * Compute how much time was left of the timeout, * by subtracting the current time and the time * before we started the call, and subtracting * that result from the user-supplied value. */ microtime(&tv1); timevalsub(&tv1, &tv0); timevalsub(&utv, &tv1); if (utv.tv_sec < 0) timevalclear(&utv); } else timevalclear(&utv); ltv.tv_sec = utv.tv_sec; ltv.tv_usec = utv.tv_usec; if ((error = copyout(<v, args->timeout, sizeof(ltv)))) goto select_out; } select_out: return (error); } #endif int linux_mremap(struct thread *td, struct linux_mremap_args *args) { uintptr_t addr; size_t len; int error = 0; if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) { td->td_retval[0] = 0; return (EINVAL); } /* * Check for the page alignment. * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK. */ if (args->addr & PAGE_MASK) { td->td_retval[0] = 0; return (EINVAL); } args->new_len = round_page(args->new_len); args->old_len = round_page(args->old_len); if (args->new_len > args->old_len) { td->td_retval[0] = 0; return (ENOMEM); } if (args->new_len < args->old_len) { addr = args->addr + args->new_len; len = args->old_len - args->new_len; error = kern_munmap(td, addr, len); } td->td_retval[0] = error ? 0 : (uintptr_t)args->addr; return (error); } #define LINUX_MS_ASYNC 0x0001 #define LINUX_MS_INVALIDATE 0x0002 #define LINUX_MS_SYNC 0x0004 int linux_msync(struct thread *td, struct linux_msync_args *args) { return (kern_msync(td, args->addr, args->len, args->fl & ~LINUX_MS_SYNC)); } #ifdef LINUX_LEGACY_SYSCALLS int linux_time(struct thread *td, struct linux_time_args *args) { struct timeval tv; l_time_t tm; int error; microtime(&tv); tm = tv.tv_sec; if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm)))) return (error); td->td_retval[0] = tm; return (0); } #endif struct l_times_argv { l_clock_t tms_utime; l_clock_t tms_stime; l_clock_t tms_cutime; l_clock_t tms_cstime; }; /* * Glibc versions prior to 2.2.1 always use hard-coded CLK_TCK value. * Since 2.2.1 Glibc uses value exported from kernel via AT_CLKTCK * auxiliary vector entry. */ #define CLK_TCK 100 #define CONVOTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) #define CONVNTCK(r) (r.tv_sec * stclohz + r.tv_usec / (1000000 / stclohz)) #define CONVTCK(r) (linux_kernver(td) >= LINUX_KERNVER_2004000 ? \ CONVNTCK(r) : CONVOTCK(r)) int linux_times(struct thread *td, struct linux_times_args *args) { struct timeval tv, utime, stime, cutime, cstime; struct l_times_argv tms; struct proc *p; int error; if (args->buf != NULL) { p = td->td_proc; PROC_LOCK(p); PROC_STATLOCK(p); calcru(p, &utime, &stime); PROC_STATUNLOCK(p); calccru(p, &cutime, &cstime); PROC_UNLOCK(p); tms.tms_utime = CONVTCK(utime); tms.tms_stime = CONVTCK(stime); tms.tms_cutime = CONVTCK(cutime); tms.tms_cstime = CONVTCK(cstime); if ((error = copyout(&tms, args->buf, sizeof(tms)))) return (error); } microuptime(&tv); td->td_retval[0] = (int)CONVTCK(tv); return (0); } int linux_newuname(struct thread *td, struct linux_newuname_args *args) { struct l_new_utsname utsname; char osname[LINUX_MAX_UTSNAME]; char osrelease[LINUX_MAX_UTSNAME]; char *p; linux_get_osname(td, osname); linux_get_osrelease(td, osrelease); bzero(&utsname, sizeof(utsname)); strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME); getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME); getcreddomainname(td->td_ucred, utsname.domainname, LINUX_MAX_UTSNAME); strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME); strlcpy(utsname.version, version, LINUX_MAX_UTSNAME); for (p = utsname.version; *p != '\0'; ++p) if (*p == '\n') { *p = '\0'; break; } #if defined(__amd64__) /* * On amd64, Linux uname(2) needs to return "x86_64" * for both 64-bit and 32-bit applications. On 32-bit, * the string returned by getauxval(AT_PLATFORM) needs * to remain "i686", though. */ strlcpy(utsname.machine, "x86_64", LINUX_MAX_UTSNAME); -#else - strlcpy(utsname.machine, linux_kplatform, LINUX_MAX_UTSNAME); +#elif defined(__aarch64__) + strlcpy(utsname.machine, "aarch64", LINUX_MAX_UTSNAME); +#elif defined(__i386__) + strlcpy(utsname.machine, "i686", LINUX_MAX_UTSNAME); #endif return (copyout(&utsname, args->buf, sizeof(utsname))); } struct l_utimbuf { l_time_t l_actime; l_time_t l_modtime; }; #ifdef LINUX_LEGACY_SYSCALLS int linux_utime(struct thread *td, struct linux_utime_args *args) { struct timeval tv[2], *tvp; struct l_utimbuf lut; char *fname; int error; if (args->times) { if ((error = copyin(args->times, &lut, sizeof lut)) != 0) return (error); tv[0].tv_sec = lut.l_actime; tv[0].tv_usec = 0; tv[1].tv_sec = lut.l_modtime; tv[1].tv_usec = 0; tvp = tv; } else tvp = NULL; if (!LUSECONVPATH(td)) { error = kern_utimesat(td, AT_FDCWD, args->fname, UIO_USERSPACE, tvp, UIO_SYSSPACE); } else { LCONVPATHEXIST(td, args->fname, &fname); error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE); LFREEPATH(fname); } return (error); } #endif #ifdef LINUX_LEGACY_SYSCALLS int linux_utimes(struct thread *td, struct linux_utimes_args *args) { l_timeval ltv[2]; struct timeval tv[2], *tvp = NULL; char *fname; int error; if (args->tptr != NULL) { if ((error = copyin(args->tptr, ltv, sizeof ltv)) != 0) return (error); tv[0].tv_sec = ltv[0].tv_sec; tv[0].tv_usec = ltv[0].tv_usec; tv[1].tv_sec = ltv[1].tv_sec; tv[1].tv_usec = ltv[1].tv_usec; tvp = tv; } if (!LUSECONVPATH(td)) { error = kern_utimesat(td, AT_FDCWD, args->fname, UIO_USERSPACE, tvp, UIO_SYSSPACE); } else { LCONVPATHEXIST(td, args->fname, &fname); error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE); LFREEPATH(fname); } return (error); } #endif static int linux_utimensat_lts_to_ts(struct l_timespec *l_times, struct timespec *times) { if (l_times->tv_nsec != LINUX_UTIME_OMIT && l_times->tv_nsec != LINUX_UTIME_NOW && (l_times->tv_nsec < 0 || l_times->tv_nsec > 999999999)) return (EINVAL); times->tv_sec = l_times->tv_sec; switch (l_times->tv_nsec) { case LINUX_UTIME_OMIT: times->tv_nsec = UTIME_OMIT; break; case LINUX_UTIME_NOW: times->tv_nsec = UTIME_NOW; break; default: times->tv_nsec = l_times->tv_nsec; } return (0); } static int linux_common_utimensat(struct thread *td, int ldfd, const char *pathname, struct timespec *timesp, int lflags) { char *path = NULL; int error, dfd, flags = 0; dfd = (ldfd == LINUX_AT_FDCWD) ? AT_FDCWD : ldfd; if (lflags & ~(LINUX_AT_SYMLINK_NOFOLLOW | LINUX_AT_EMPTY_PATH)) return (EINVAL); if (timesp != NULL) { /* This breaks POSIX, but is what the Linux kernel does * _on purpose_ (documented in the man page for utimensat(2)), * so we must follow that behaviour. */ if (timesp[0].tv_nsec == UTIME_OMIT && timesp[1].tv_nsec == UTIME_OMIT) return (0); } if (lflags & LINUX_AT_SYMLINK_NOFOLLOW) flags |= AT_SYMLINK_NOFOLLOW; if (lflags & LINUX_AT_EMPTY_PATH) flags |= AT_EMPTY_PATH; if (!LUSECONVPATH(td)) { if (pathname != NULL) { return (kern_utimensat(td, dfd, pathname, UIO_USERSPACE, timesp, UIO_SYSSPACE, flags)); } } if (pathname != NULL) LCONVPATHEXIST_AT(td, pathname, &path, dfd); else if (lflags != 0) return (EINVAL); if (path == NULL) error = kern_futimens(td, dfd, timesp, UIO_SYSSPACE); else { error = kern_utimensat(td, dfd, path, UIO_SYSSPACE, timesp, UIO_SYSSPACE, flags); LFREEPATH(path); } return (error); } int linux_utimensat(struct thread *td, struct linux_utimensat_args *args) { struct l_timespec l_times[2]; struct timespec times[2], *timesp; int error; if (args->times != NULL) { error = copyin(args->times, l_times, sizeof(l_times)); if (error != 0) return (error); error = linux_utimensat_lts_to_ts(&l_times[0], ×[0]); if (error != 0) return (error); error = linux_utimensat_lts_to_ts(&l_times[1], ×[1]); if (error != 0) return (error); timesp = times; } else timesp = NULL; return (linux_common_utimensat(td, args->dfd, args->pathname, timesp, args->flags)); } #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) static int linux_utimensat_lts64_to_ts(struct l_timespec64 *l_times, struct timespec *times) { if (l_times->tv_nsec != LINUX_UTIME_OMIT && l_times->tv_nsec != LINUX_UTIME_NOW && (l_times->tv_nsec < 0 || l_times->tv_nsec > 999999999)) return (EINVAL); times->tv_sec = l_times->tv_sec; switch (l_times->tv_nsec) { case LINUX_UTIME_OMIT: times->tv_nsec = UTIME_OMIT; break; case LINUX_UTIME_NOW: times->tv_nsec = UTIME_NOW; break; default: times->tv_nsec = l_times->tv_nsec; } return (0); } int linux_utimensat_time64(struct thread *td, struct linux_utimensat_time64_args *args) { struct l_timespec64 l_times[2]; struct timespec times[2], *timesp; int error; if (args->times64 != NULL) { error = copyin(args->times64, l_times, sizeof(l_times)); if (error != 0) return (error); error = linux_utimensat_lts64_to_ts(&l_times[0], ×[0]); if (error != 0) return (error); error = linux_utimensat_lts64_to_ts(&l_times[1], ×[1]); if (error != 0) return (error); timesp = times; } else timesp = NULL; return (linux_common_utimensat(td, args->dfd, args->pathname, timesp, args->flags)); } #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ #ifdef LINUX_LEGACY_SYSCALLS int linux_futimesat(struct thread *td, struct linux_futimesat_args *args) { l_timeval ltv[2]; struct timeval tv[2], *tvp = NULL; char *fname; int error, dfd; dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; if (args->utimes != NULL) { if ((error = copyin(args->utimes, ltv, sizeof ltv)) != 0) return (error); tv[0].tv_sec = ltv[0].tv_sec; tv[0].tv_usec = ltv[0].tv_usec; tv[1].tv_sec = ltv[1].tv_sec; tv[1].tv_usec = ltv[1].tv_usec; tvp = tv; } if (!LUSECONVPATH(td)) { error = kern_utimesat(td, dfd, args->filename, UIO_USERSPACE, tvp, UIO_SYSSPACE); } else { LCONVPATHEXIST_AT(td, args->filename, &fname, dfd); error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE); LFREEPATH(fname); } return (error); } #endif static int linux_common_wait(struct thread *td, int pid, int *statusp, int options, struct __wrusage *wrup) { siginfo_t siginfo; idtype_t idtype; id_t id; int error, status, tmpstat; if (pid == WAIT_ANY) { idtype = P_ALL; id = 0; } else if (pid < 0) { idtype = P_PGID; id = (id_t)-pid; } else { idtype = P_PID; id = (id_t)pid; } /* * For backward compatibility we implicitly add flags WEXITED * and WTRAPPED here. */ options |= WEXITED | WTRAPPED; error = kern_wait6(td, idtype, id, &status, options, wrup, &siginfo); if (error) return (error); if (statusp) { tmpstat = status & 0xffff; if (WIFSIGNALED(tmpstat)) { tmpstat = (tmpstat & 0xffffff80) | bsd_to_linux_signal(WTERMSIG(tmpstat)); } else if (WIFSTOPPED(tmpstat)) { tmpstat = (tmpstat & 0xffff00ff) | (bsd_to_linux_signal(WSTOPSIG(tmpstat)) << 8); #if defined(__amd64__) && !defined(COMPAT_LINUX32) if (WSTOPSIG(status) == SIGTRAP) { tmpstat = linux_ptrace_status(td, siginfo.si_pid, tmpstat); } #endif } else if (WIFCONTINUED(tmpstat)) { tmpstat = 0xffff; } error = copyout(&tmpstat, statusp, sizeof(int)); } return (error); } #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) int linux_waitpid(struct thread *td, struct linux_waitpid_args *args) { struct linux_wait4_args wait4_args; wait4_args.pid = args->pid; wait4_args.status = args->status; wait4_args.options = args->options; wait4_args.rusage = NULL; return (linux_wait4(td, &wait4_args)); } #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ int linux_wait4(struct thread *td, struct linux_wait4_args *args) { int error, options; struct __wrusage wru, *wrup; if (args->options & ~(LINUX_WUNTRACED | LINUX_WNOHANG | LINUX_WCONTINUED | __WCLONE | __WNOTHREAD | __WALL)) return (EINVAL); options = WEXITED; linux_to_bsd_waitopts(args->options, &options); if (args->rusage != NULL) wrup = &wru; else wrup = NULL; error = linux_common_wait(td, args->pid, args->status, options, wrup); if (error != 0) return (error); if (args->rusage != NULL) error = linux_copyout_rusage(&wru.wru_self, args->rusage); return (error); } int linux_waitid(struct thread *td, struct linux_waitid_args *args) { int status, options, sig; struct __wrusage wru; siginfo_t siginfo; l_siginfo_t lsi; idtype_t idtype; struct proc *p; int error; options = 0; linux_to_bsd_waitopts(args->options, &options); if (options & ~(WNOHANG | WNOWAIT | WEXITED | WUNTRACED | WCONTINUED)) return (EINVAL); if (!(options & (WEXITED | WUNTRACED | WCONTINUED))) return (EINVAL); switch (args->idtype) { case LINUX_P_ALL: idtype = P_ALL; break; case LINUX_P_PID: if (args->id <= 0) return (EINVAL); idtype = P_PID; break; case LINUX_P_PGID: if (args->id <= 0) return (EINVAL); idtype = P_PGID; break; default: return (EINVAL); } error = kern_wait6(td, idtype, args->id, &status, options, &wru, &siginfo); if (error != 0) return (error); if (args->rusage != NULL) { error = linux_copyout_rusage(&wru.wru_children, args->rusage); if (error != 0) return (error); } if (args->info != NULL) { p = td->td_proc; bzero(&lsi, sizeof(lsi)); if (td->td_retval[0] != 0) { sig = bsd_to_linux_signal(siginfo.si_signo); siginfo_to_lsiginfo(&siginfo, &lsi, sig); } error = copyout(&lsi, args->info, sizeof(lsi)); } td->td_retval[0] = 0; return (error); } #ifdef LINUX_LEGACY_SYSCALLS int linux_mknod(struct thread *td, struct linux_mknod_args *args) { char *path; int error; enum uio_seg seg; bool convpath; convpath = LUSECONVPATH(td); if (!convpath) { path = args->path; seg = UIO_USERSPACE; } else { LCONVPATHCREAT(td, args->path, &path); seg = UIO_SYSSPACE; } switch (args->mode & S_IFMT) { case S_IFIFO: case S_IFSOCK: error = kern_mkfifoat(td, AT_FDCWD, path, seg, args->mode); break; case S_IFCHR: case S_IFBLK: error = kern_mknodat(td, AT_FDCWD, path, seg, args->mode, args->dev); break; case S_IFDIR: error = EPERM; break; case 0: args->mode |= S_IFREG; /* FALLTHROUGH */ case S_IFREG: error = kern_openat(td, AT_FDCWD, path, seg, O_WRONLY | O_CREAT | O_TRUNC, args->mode); if (error == 0) kern_close(td, td->td_retval[0]); break; default: error = EINVAL; break; } if (convpath) LFREEPATH(path); return (error); } #endif int linux_mknodat(struct thread *td, struct linux_mknodat_args *args) { char *path; int error, dfd; enum uio_seg seg; bool convpath; dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; convpath = LUSECONVPATH(td); if (!convpath) { path = __DECONST(char *, args->filename); seg = UIO_USERSPACE; } else { LCONVPATHCREAT_AT(td, args->filename, &path, dfd); seg = UIO_SYSSPACE; } switch (args->mode & S_IFMT) { case S_IFIFO: case S_IFSOCK: error = kern_mkfifoat(td, dfd, path, seg, args->mode); break; case S_IFCHR: case S_IFBLK: error = kern_mknodat(td, dfd, path, seg, args->mode, args->dev); break; case S_IFDIR: error = EPERM; break; case 0: args->mode |= S_IFREG; /* FALLTHROUGH */ case S_IFREG: error = kern_openat(td, dfd, path, seg, O_WRONLY | O_CREAT | O_TRUNC, args->mode); if (error == 0) kern_close(td, td->td_retval[0]); break; default: error = EINVAL; break; } if (convpath) LFREEPATH(path); return (error); } /* * UGH! This is just about the dumbest idea I've ever heard!! */ int linux_personality(struct thread *td, struct linux_personality_args *args) { struct linux_pemuldata *pem; struct proc *p = td->td_proc; uint32_t old; PROC_LOCK(p); pem = pem_find(p); old = pem->persona; if (args->per != 0xffffffff) pem->persona = args->per; PROC_UNLOCK(p); td->td_retval[0] = old; return (0); } struct l_itimerval { l_timeval it_interval; l_timeval it_value; }; #define B2L_ITIMERVAL(bip, lip) \ (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec; \ (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec; \ (bip)->it_value.tv_sec = (lip)->it_value.tv_sec; \ (bip)->it_value.tv_usec = (lip)->it_value.tv_usec; int linux_setitimer(struct thread *td, struct linux_setitimer_args *uap) { int error; struct l_itimerval ls; struct itimerval aitv, oitv; if (uap->itv == NULL) { uap->itv = uap->oitv; return (linux_getitimer(td, (struct linux_getitimer_args *)uap)); } error = copyin(uap->itv, &ls, sizeof(ls)); if (error != 0) return (error); B2L_ITIMERVAL(&aitv, &ls); error = kern_setitimer(td, uap->which, &aitv, &oitv); if (error != 0 || uap->oitv == NULL) return (error); B2L_ITIMERVAL(&ls, &oitv); return (copyout(&ls, uap->oitv, sizeof(ls))); } int linux_getitimer(struct thread *td, struct linux_getitimer_args *uap) { int error; struct l_itimerval ls; struct itimerval aitv; error = kern_getitimer(td, uap->which, &aitv); if (error != 0) return (error); B2L_ITIMERVAL(&ls, &aitv); return (copyout(&ls, uap->itv, sizeof(ls))); } #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) int linux_nice(struct thread *td, struct linux_nice_args *args) { return (kern_setpriority(td, PRIO_PROCESS, 0, args->inc)); } #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ int linux_setgroups(struct thread *td, struct linux_setgroups_args *args) { struct ucred *newcred, *oldcred; l_gid_t *linux_gidset; gid_t *bsd_gidset; int ngrp, error; struct proc *p; ngrp = args->gidsetsize; if (ngrp < 0 || ngrp >= ngroups_max + 1) return (EINVAL); linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK); error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t)); if (error) goto out; newcred = crget(); crextend(newcred, ngrp + 1); p = td->td_proc; PROC_LOCK(p); oldcred = p->p_ucred; crcopy(newcred, oldcred); /* * cr_groups[0] holds egid. Setting the whole set from * the supplied set will cause egid to be changed too. * Keep cr_groups[0] unchanged to prevent that. */ if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS)) != 0) { PROC_UNLOCK(p); crfree(newcred); goto out; } if (ngrp > 0) { newcred->cr_ngroups = ngrp + 1; bsd_gidset = newcred->cr_groups; ngrp--; while (ngrp >= 0) { bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; ngrp--; } } else newcred->cr_ngroups = 1; setsugid(p); proc_set_cred(p, newcred); PROC_UNLOCK(p); crfree(oldcred); error = 0; out: free(linux_gidset, M_LINUX); return (error); } int linux_getgroups(struct thread *td, struct linux_getgroups_args *args) { struct ucred *cred; l_gid_t *linux_gidset; gid_t *bsd_gidset; int bsd_gidsetsz, ngrp, error; cred = td->td_ucred; bsd_gidset = cred->cr_groups; bsd_gidsetsz = cred->cr_ngroups - 1; /* * cr_groups[0] holds egid. Returning the whole set * here will cause a duplicate. Exclude cr_groups[0] * to prevent that. */ if ((ngrp = args->gidsetsize) == 0) { td->td_retval[0] = bsd_gidsetsz; return (0); } if (ngrp < bsd_gidsetsz) return (EINVAL); ngrp = 0; linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset), M_LINUX, M_WAITOK); while (ngrp < bsd_gidsetsz) { linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; ngrp++; } error = copyout(linux_gidset, args->grouplist, ngrp * sizeof(l_gid_t)); free(linux_gidset, M_LINUX); if (error) return (error); td->td_retval[0] = ngrp; return (0); } static bool linux_get_dummy_limit(l_uint resource, struct rlimit *rlim) { if (linux_dummy_rlimits == 0) return (false); switch (resource) { case LINUX_RLIMIT_LOCKS: case LINUX_RLIMIT_SIGPENDING: case LINUX_RLIMIT_MSGQUEUE: case LINUX_RLIMIT_RTTIME: rlim->rlim_cur = LINUX_RLIM_INFINITY; rlim->rlim_max = LINUX_RLIM_INFINITY; return (true); case LINUX_RLIMIT_NICE: case LINUX_RLIMIT_RTPRIO: rlim->rlim_cur = 0; rlim->rlim_max = 0; return (true); default: return (false); } } int linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args) { struct rlimit bsd_rlim; struct l_rlimit rlim; u_int which; int error; if (args->resource >= LINUX_RLIM_NLIMITS) return (EINVAL); which = linux_to_bsd_resource[args->resource]; if (which == -1) return (EINVAL); error = copyin(args->rlim, &rlim, sizeof(rlim)); if (error) return (error); bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur; bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max; return (kern_setrlimit(td, which, &bsd_rlim)); } #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) int linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args) { struct l_rlimit rlim; struct rlimit bsd_rlim; u_int which; if (linux_get_dummy_limit(args->resource, &bsd_rlim)) { rlim.rlim_cur = bsd_rlim.rlim_cur; rlim.rlim_max = bsd_rlim.rlim_max; return (copyout(&rlim, args->rlim, sizeof(rlim))); } if (args->resource >= LINUX_RLIM_NLIMITS) return (EINVAL); which = linux_to_bsd_resource[args->resource]; if (which == -1) return (EINVAL); lim_rlimit(td, which, &bsd_rlim); #ifdef COMPAT_LINUX32 rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur; if (rlim.rlim_cur == UINT_MAX) rlim.rlim_cur = INT_MAX; rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max; if (rlim.rlim_max == UINT_MAX) rlim.rlim_max = INT_MAX; #else rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur; if (rlim.rlim_cur == ULONG_MAX) rlim.rlim_cur = LONG_MAX; rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max; if (rlim.rlim_max == ULONG_MAX) rlim.rlim_max = LONG_MAX; #endif return (copyout(&rlim, args->rlim, sizeof(rlim))); } #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ int linux_getrlimit(struct thread *td, struct linux_getrlimit_args *args) { struct l_rlimit rlim; struct rlimit bsd_rlim; u_int which; if (linux_get_dummy_limit(args->resource, &bsd_rlim)) { rlim.rlim_cur = bsd_rlim.rlim_cur; rlim.rlim_max = bsd_rlim.rlim_max; return (copyout(&rlim, args->rlim, sizeof(rlim))); } if (args->resource >= LINUX_RLIM_NLIMITS) return (EINVAL); which = linux_to_bsd_resource[args->resource]; if (which == -1) return (EINVAL); lim_rlimit(td, which, &bsd_rlim); rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur; rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max; return (copyout(&rlim, args->rlim, sizeof(rlim))); } int linux_sched_setscheduler(struct thread *td, struct linux_sched_setscheduler_args *args) { struct sched_param sched_param; struct thread *tdt; int error, policy; switch (args->policy) { case LINUX_SCHED_OTHER: policy = SCHED_OTHER; break; case LINUX_SCHED_FIFO: policy = SCHED_FIFO; break; case LINUX_SCHED_RR: policy = SCHED_RR; break; default: return (EINVAL); } error = copyin(args->param, &sched_param, sizeof(sched_param)); if (error) return (error); if (linux_map_sched_prio) { switch (policy) { case SCHED_OTHER: if (sched_param.sched_priority != 0) return (EINVAL); sched_param.sched_priority = PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE; break; case SCHED_FIFO: case SCHED_RR: if (sched_param.sched_priority < 1 || sched_param.sched_priority >= LINUX_MAX_RT_PRIO) return (EINVAL); /* * Map [1, LINUX_MAX_RT_PRIO - 1] to * [0, RTP_PRIO_MAX - RTP_PRIO_MIN] (rounding down). */ sched_param.sched_priority = (sched_param.sched_priority - 1) * (RTP_PRIO_MAX - RTP_PRIO_MIN + 1) / (LINUX_MAX_RT_PRIO - 1); break; } } tdt = linux_tdfind(td, args->pid, -1); if (tdt == NULL) return (ESRCH); error = kern_sched_setscheduler(td, tdt, policy, &sched_param); PROC_UNLOCK(tdt->td_proc); return (error); } int linux_sched_getscheduler(struct thread *td, struct linux_sched_getscheduler_args *args) { struct thread *tdt; int error, policy; tdt = linux_tdfind(td, args->pid, -1); if (tdt == NULL) return (ESRCH); error = kern_sched_getscheduler(td, tdt, &policy); PROC_UNLOCK(tdt->td_proc); switch (policy) { case SCHED_OTHER: td->td_retval[0] = LINUX_SCHED_OTHER; break; case SCHED_FIFO: td->td_retval[0] = LINUX_SCHED_FIFO; break; case SCHED_RR: td->td_retval[0] = LINUX_SCHED_RR; break; } return (error); } int linux_sched_get_priority_max(struct thread *td, struct linux_sched_get_priority_max_args *args) { struct sched_get_priority_max_args bsd; if (linux_map_sched_prio) { switch (args->policy) { case LINUX_SCHED_OTHER: td->td_retval[0] = 0; return (0); case LINUX_SCHED_FIFO: case LINUX_SCHED_RR: td->td_retval[0] = LINUX_MAX_RT_PRIO - 1; return (0); default: return (EINVAL); } } switch (args->policy) { case LINUX_SCHED_OTHER: bsd.policy = SCHED_OTHER; break; case LINUX_SCHED_FIFO: bsd.policy = SCHED_FIFO; break; case LINUX_SCHED_RR: bsd.policy = SCHED_RR; break; default: return (EINVAL); } return (sys_sched_get_priority_max(td, &bsd)); } int linux_sched_get_priority_min(struct thread *td, struct linux_sched_get_priority_min_args *args) { struct sched_get_priority_min_args bsd; if (linux_map_sched_prio) { switch (args->policy) { case LINUX_SCHED_OTHER: td->td_retval[0] = 0; return (0); case LINUX_SCHED_FIFO: case LINUX_SCHED_RR: td->td_retval[0] = 1; return (0); default: return (EINVAL); } } switch (args->policy) { case LINUX_SCHED_OTHER: bsd.policy = SCHED_OTHER; break; case LINUX_SCHED_FIFO: bsd.policy = SCHED_FIFO; break; case LINUX_SCHED_RR: bsd.policy = SCHED_RR; break; default: return (EINVAL); } return (sys_sched_get_priority_min(td, &bsd)); } #define REBOOT_CAD_ON 0x89abcdef #define REBOOT_CAD_OFF 0 #define REBOOT_HALT 0xcdef0123 #define REBOOT_RESTART 0x01234567 #define REBOOT_RESTART2 0xA1B2C3D4 #define REBOOT_POWEROFF 0x4321FEDC #define REBOOT_MAGIC1 0xfee1dead #define REBOOT_MAGIC2 0x28121969 #define REBOOT_MAGIC2A 0x05121996 #define REBOOT_MAGIC2B 0x16041998 int linux_reboot(struct thread *td, struct linux_reboot_args *args) { struct reboot_args bsd_args; if (args->magic1 != REBOOT_MAGIC1) return (EINVAL); switch (args->magic2) { case REBOOT_MAGIC2: case REBOOT_MAGIC2A: case REBOOT_MAGIC2B: break; default: return (EINVAL); } switch (args->cmd) { case REBOOT_CAD_ON: case REBOOT_CAD_OFF: return (priv_check(td, PRIV_REBOOT)); case REBOOT_HALT: bsd_args.opt = RB_HALT; break; case REBOOT_RESTART: case REBOOT_RESTART2: bsd_args.opt = 0; break; case REBOOT_POWEROFF: bsd_args.opt = RB_POWEROFF; break; default: return (EINVAL); } return (sys_reboot(td, &bsd_args)); } int linux_getpid(struct thread *td, struct linux_getpid_args *args) { td->td_retval[0] = td->td_proc->p_pid; return (0); } int linux_gettid(struct thread *td, struct linux_gettid_args *args) { struct linux_emuldata *em; em = em_find(td); KASSERT(em != NULL, ("gettid: emuldata not found.\n")); td->td_retval[0] = em->em_tid; return (0); } int linux_getppid(struct thread *td, struct linux_getppid_args *args) { td->td_retval[0] = kern_getppid(td); return (0); } int linux_getgid(struct thread *td, struct linux_getgid_args *args) { td->td_retval[0] = td->td_ucred->cr_rgid; return (0); } int linux_getuid(struct thread *td, struct linux_getuid_args *args) { td->td_retval[0] = td->td_ucred->cr_ruid; return (0); } int linux_getsid(struct thread *td, struct linux_getsid_args *args) { return (kern_getsid(td, args->pid)); } int linux_nosys(struct thread *td, struct nosys_args *ignore) { return (ENOSYS); } int linux_getpriority(struct thread *td, struct linux_getpriority_args *args) { int error; error = kern_getpriority(td, args->which, args->who); td->td_retval[0] = 20 - td->td_retval[0]; return (error); } int linux_sethostname(struct thread *td, struct linux_sethostname_args *args) { int name[2]; name[0] = CTL_KERN; name[1] = KERN_HOSTNAME; return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname, args->len, 0, 0)); } int linux_setdomainname(struct thread *td, struct linux_setdomainname_args *args) { int name[2]; name[0] = CTL_KERN; name[1] = KERN_NISDOMAINNAME; return (userland_sysctl(td, name, 2, 0, 0, 0, args->name, args->len, 0, 0)); } int linux_exit_group(struct thread *td, struct linux_exit_group_args *args) { LINUX_CTR2(exit_group, "thread(%d) (%d)", td->td_tid, args->error_code); /* * XXX: we should send a signal to the parent if * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?) * as it doesnt occur often. */ exit1(td, args->error_code, 0); /* NOTREACHED */ } #define _LINUX_CAPABILITY_VERSION_1 0x19980330 #define _LINUX_CAPABILITY_VERSION_2 0x20071026 #define _LINUX_CAPABILITY_VERSION_3 0x20080522 struct l_user_cap_header { l_int version; l_int pid; }; struct l_user_cap_data { l_int effective; l_int permitted; l_int inheritable; }; int linux_capget(struct thread *td, struct linux_capget_args *uap) { struct l_user_cap_header luch; struct l_user_cap_data lucd[2]; int error, u32s; if (uap->hdrp == NULL) return (EFAULT); error = copyin(uap->hdrp, &luch, sizeof(luch)); if (error != 0) return (error); switch (luch.version) { case _LINUX_CAPABILITY_VERSION_1: u32s = 1; break; case _LINUX_CAPABILITY_VERSION_2: case _LINUX_CAPABILITY_VERSION_3: u32s = 2; break; default: luch.version = _LINUX_CAPABILITY_VERSION_1; error = copyout(&luch, uap->hdrp, sizeof(luch)); if (error) return (error); return (EINVAL); } if (luch.pid) return (EPERM); if (uap->datap) { /* * The current implementation doesn't support setting * a capability (it's essentially a stub) so indicate * that no capabilities are currently set or available * to request. */ memset(&lucd, 0, u32s * sizeof(lucd[0])); error = copyout(&lucd, uap->datap, u32s * sizeof(lucd[0])); } return (error); } int linux_capset(struct thread *td, struct linux_capset_args *uap) { struct l_user_cap_header luch; struct l_user_cap_data lucd[2]; int error, i, u32s; if (uap->hdrp == NULL || uap->datap == NULL) return (EFAULT); error = copyin(uap->hdrp, &luch, sizeof(luch)); if (error != 0) return (error); switch (luch.version) { case _LINUX_CAPABILITY_VERSION_1: u32s = 1; break; case _LINUX_CAPABILITY_VERSION_2: case _LINUX_CAPABILITY_VERSION_3: u32s = 2; break; default: luch.version = _LINUX_CAPABILITY_VERSION_1; error = copyout(&luch, uap->hdrp, sizeof(luch)); if (error) return (error); return (EINVAL); } if (luch.pid) return (EPERM); error = copyin(uap->datap, &lucd, u32s * sizeof(lucd[0])); if (error != 0) return (error); /* We currently don't support setting any capabilities. */ for (i = 0; i < u32s; i++) { if (lucd[i].effective || lucd[i].permitted || lucd[i].inheritable) { linux_msg(td, "capset[%d] effective=0x%x, permitted=0x%x, " "inheritable=0x%x is not implemented", i, (int)lucd[i].effective, (int)lucd[i].permitted, (int)lucd[i].inheritable); return (EPERM); } } return (0); } int linux_prctl(struct thread *td, struct linux_prctl_args *args) { int error = 0, max_size, arg; struct proc *p = td->td_proc; char comm[LINUX_MAX_COMM_LEN]; int pdeath_signal, trace_state; switch (args->option) { case LINUX_PR_SET_PDEATHSIG: if (!LINUX_SIG_VALID(args->arg2)) return (EINVAL); pdeath_signal = linux_to_bsd_signal(args->arg2); return (kern_procctl(td, P_PID, 0, PROC_PDEATHSIG_CTL, &pdeath_signal)); case LINUX_PR_GET_PDEATHSIG: error = kern_procctl(td, P_PID, 0, PROC_PDEATHSIG_STATUS, &pdeath_signal); if (error != 0) return (error); pdeath_signal = bsd_to_linux_signal(pdeath_signal); return (copyout(&pdeath_signal, (void *)(register_t)args->arg2, sizeof(pdeath_signal))); /* * In Linux, this flag controls if set[gu]id processes can coredump. * There are additional semantics imposed on processes that cannot * coredump: * - Such processes can not be ptraced. * - There are some semantics around ownership of process-related files * in the /proc namespace. * * In FreeBSD, we can (and by default, do) disable setuid coredump * system-wide with 'sugid_coredump.' We control tracability on a * per-process basis with the procctl PROC_TRACE (=> P2_NOTRACE flag). * By happy coincidence, P2_NOTRACE also prevents coredumping. So the * procctl is roughly analogous to Linux's DUMPABLE. * * So, proxy these knobs to the corresponding PROC_TRACE setting. */ case LINUX_PR_GET_DUMPABLE: error = kern_procctl(td, P_PID, p->p_pid, PROC_TRACE_STATUS, &trace_state); if (error != 0) return (error); td->td_retval[0] = (trace_state != -1); return (0); case LINUX_PR_SET_DUMPABLE: /* * It is only valid for userspace to set one of these two * flags, and only one at a time. */ switch (args->arg2) { case LINUX_SUID_DUMP_DISABLE: trace_state = PROC_TRACE_CTL_DISABLE_EXEC; break; case LINUX_SUID_DUMP_USER: trace_state = PROC_TRACE_CTL_ENABLE; break; default: return (EINVAL); } return (kern_procctl(td, P_PID, p->p_pid, PROC_TRACE_CTL, &trace_state)); case LINUX_PR_GET_KEEPCAPS: /* * Indicate that we always clear the effective and * permitted capability sets when the user id becomes * non-zero (actually the capability sets are simply * always zero in the current implementation). */ td->td_retval[0] = 0; break; case LINUX_PR_SET_KEEPCAPS: /* * Ignore requests to keep the effective and permitted * capability sets when the user id becomes non-zero. */ break; case LINUX_PR_SET_NAME: /* * To be on the safe side we need to make sure to not * overflow the size a Linux program expects. We already * do this here in the copyin, so that we don't need to * check on copyout. */ max_size = MIN(sizeof(comm), sizeof(p->p_comm)); error = copyinstr((void *)(register_t)args->arg2, comm, max_size, NULL); /* Linux silently truncates the name if it is too long. */ if (error == ENAMETOOLONG) { /* * XXX: copyinstr() isn't documented to populate the * array completely, so do a copyin() to be on the * safe side. This should be changed in case * copyinstr() is changed to guarantee this. */ error = copyin((void *)(register_t)args->arg2, comm, max_size - 1); comm[max_size - 1] = '\0'; } if (error) return (error); PROC_LOCK(p); strlcpy(p->p_comm, comm, sizeof(p->p_comm)); PROC_UNLOCK(p); break; case LINUX_PR_GET_NAME: PROC_LOCK(p); strlcpy(comm, p->p_comm, sizeof(comm)); PROC_UNLOCK(p); error = copyout(comm, (void *)(register_t)args->arg2, strlen(comm) + 1); break; case LINUX_PR_GET_SECCOMP: case LINUX_PR_SET_SECCOMP: /* * Same as returned by Linux without CONFIG_SECCOMP enabled. */ error = EINVAL; break; case LINUX_PR_CAPBSET_READ: #if 0 /* * This makes too much noise with Ubuntu Focal. */ linux_msg(td, "unsupported prctl PR_CAPBSET_READ %d", (int)args->arg2); #endif error = EINVAL; break; case LINUX_PR_SET_NO_NEW_PRIVS: arg = args->arg2 == 1 ? PROC_NO_NEW_PRIVS_ENABLE : PROC_NO_NEW_PRIVS_DISABLE; error = kern_procctl(td, P_PID, p->p_pid, PROC_NO_NEW_PRIVS_CTL, &arg); break; case LINUX_PR_SET_PTRACER: linux_msg(td, "unsupported prctl PR_SET_PTRACER"); error = EINVAL; break; default: linux_msg(td, "unsupported prctl option %d", args->option); error = EINVAL; break; } return (error); } int linux_sched_setparam(struct thread *td, struct linux_sched_setparam_args *uap) { struct sched_param sched_param; struct thread *tdt; int error, policy; error = copyin(uap->param, &sched_param, sizeof(sched_param)); if (error) return (error); tdt = linux_tdfind(td, uap->pid, -1); if (tdt == NULL) return (ESRCH); if (linux_map_sched_prio) { error = kern_sched_getscheduler(td, tdt, &policy); if (error) goto out; switch (policy) { case SCHED_OTHER: if (sched_param.sched_priority != 0) { error = EINVAL; goto out; } sched_param.sched_priority = PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE; break; case SCHED_FIFO: case SCHED_RR: if (sched_param.sched_priority < 1 || sched_param.sched_priority >= LINUX_MAX_RT_PRIO) { error = EINVAL; goto out; } /* * Map [1, LINUX_MAX_RT_PRIO - 1] to * [0, RTP_PRIO_MAX - RTP_PRIO_MIN] (rounding down). */ sched_param.sched_priority = (sched_param.sched_priority - 1) * (RTP_PRIO_MAX - RTP_PRIO_MIN + 1) / (LINUX_MAX_RT_PRIO - 1); break; } } error = kern_sched_setparam(td, tdt, &sched_param); out: PROC_UNLOCK(tdt->td_proc); return (error); } int linux_sched_getparam(struct thread *td, struct linux_sched_getparam_args *uap) { struct sched_param sched_param; struct thread *tdt; int error, policy; tdt = linux_tdfind(td, uap->pid, -1); if (tdt == NULL) return (ESRCH); error = kern_sched_getparam(td, tdt, &sched_param); if (error) { PROC_UNLOCK(tdt->td_proc); return (error); } if (linux_map_sched_prio) { error = kern_sched_getscheduler(td, tdt, &policy); PROC_UNLOCK(tdt->td_proc); if (error) return (error); switch (policy) { case SCHED_OTHER: sched_param.sched_priority = 0; break; case SCHED_FIFO: case SCHED_RR: /* * Map [0, RTP_PRIO_MAX - RTP_PRIO_MIN] to * [1, LINUX_MAX_RT_PRIO - 1] (rounding up). */ sched_param.sched_priority = (sched_param.sched_priority * (LINUX_MAX_RT_PRIO - 1) + (RTP_PRIO_MAX - RTP_PRIO_MIN - 1)) / (RTP_PRIO_MAX - RTP_PRIO_MIN) + 1; break; } } else PROC_UNLOCK(tdt->td_proc); error = copyout(&sched_param, uap->param, sizeof(sched_param)); return (error); } static const struct cpuset_copy_cb copy_set = { .cpuset_copyin = copyin, .cpuset_copyout = copyout }; /* * Get affinity of a process. */ int linux_sched_getaffinity(struct thread *td, struct linux_sched_getaffinity_args *args) { int error; struct thread *tdt; if (args->len < sizeof(cpuset_t)) return (EINVAL); tdt = linux_tdfind(td, args->pid, -1); if (tdt == NULL) return (ESRCH); PROC_UNLOCK(tdt->td_proc); error = kern_cpuset_getaffinity(td, CPU_LEVEL_WHICH, CPU_WHICH_TID, tdt->td_tid, sizeof(cpuset_t), (cpuset_t *)args->user_mask_ptr, ©_set); if (error == 0) td->td_retval[0] = sizeof(cpuset_t); return (error); } /* * Set affinity of a process. */ int linux_sched_setaffinity(struct thread *td, struct linux_sched_setaffinity_args *args) { struct thread *tdt; if (args->len < sizeof(cpuset_t)) return (EINVAL); tdt = linux_tdfind(td, args->pid, -1); if (tdt == NULL) return (ESRCH); PROC_UNLOCK(tdt->td_proc); return (kern_cpuset_setaffinity(td, CPU_LEVEL_WHICH, CPU_WHICH_TID, tdt->td_tid, sizeof(cpuset_t), (cpuset_t *) args->user_mask_ptr, ©_set)); } struct linux_rlimit64 { uint64_t rlim_cur; uint64_t rlim_max; }; int linux_prlimit64(struct thread *td, struct linux_prlimit64_args *args) { struct rlimit rlim, nrlim; struct linux_rlimit64 lrlim; struct proc *p; u_int which; int flags; int error; if (args->new == NULL && args->old != NULL) { if (linux_get_dummy_limit(args->resource, &rlim)) { lrlim.rlim_cur = rlim.rlim_cur; lrlim.rlim_max = rlim.rlim_max; return (copyout(&lrlim, args->old, sizeof(lrlim))); } } if (args->resource >= LINUX_RLIM_NLIMITS) return (EINVAL); which = linux_to_bsd_resource[args->resource]; if (which == -1) return (EINVAL); if (args->new != NULL) { /* * Note. Unlike FreeBSD where rlim is signed 64-bit Linux * rlim is unsigned 64-bit. FreeBSD treats negative limits * as INFINITY so we do not need a conversion even. */ error = copyin(args->new, &nrlim, sizeof(nrlim)); if (error != 0) return (error); } flags = PGET_HOLD | PGET_NOTWEXIT; if (args->new != NULL) flags |= PGET_CANDEBUG; else flags |= PGET_CANSEE; if (args->pid == 0) { p = td->td_proc; PHOLD(p); } else { error = pget(args->pid, flags, &p); if (error != 0) return (error); } if (args->old != NULL) { PROC_LOCK(p); lim_rlimit_proc(p, which, &rlim); PROC_UNLOCK(p); if (rlim.rlim_cur == RLIM_INFINITY) lrlim.rlim_cur = LINUX_RLIM_INFINITY; else lrlim.rlim_cur = rlim.rlim_cur; if (rlim.rlim_max == RLIM_INFINITY) lrlim.rlim_max = LINUX_RLIM_INFINITY; else lrlim.rlim_max = rlim.rlim_max; error = copyout(&lrlim, args->old, sizeof(lrlim)); if (error != 0) goto out; } if (args->new != NULL) error = kern_proc_setrlimit(td, p, which, &nrlim); out: PRELE(p); return (error); } int linux_pselect6(struct thread *td, struct linux_pselect6_args *args) { struct l_timespec lts; struct timespec ts, *tsp; int error; if (args->tsp != NULL) { error = copyin(args->tsp, <s, sizeof(lts)); if (error != 0) return (error); error = linux_to_native_timespec(&ts, <s); if (error != 0) return (error); tsp = &ts; } else tsp = NULL; error = linux_common_pselect6(td, args->nfds, args->readfds, args->writefds, args->exceptfds, tsp, args->sig); if (error != 0) return (error); if (args->tsp != NULL) { error = native_to_linux_timespec(<s, tsp); if (error == 0) error = copyout(<s, args->tsp, sizeof(lts)); } return (error); } static int linux_common_pselect6(struct thread *td, l_int nfds, l_fd_set *readfds, l_fd_set *writefds, l_fd_set *exceptfds, struct timespec *tsp, l_uintptr_t *sig) { struct timeval utv, tv0, tv1, *tvp; struct l_pselect6arg lpse6; l_sigset_t l_ss; sigset_t *ssp; sigset_t ss; int error; ssp = NULL; if (sig != NULL) { error = copyin(sig, &lpse6, sizeof(lpse6)); if (error != 0) return (error); if (lpse6.ss_len != sizeof(l_ss)) return (EINVAL); if (lpse6.ss != 0) { error = copyin(PTRIN(lpse6.ss), &l_ss, sizeof(l_ss)); if (error != 0) return (error); linux_to_bsd_sigset(&l_ss, &ss); ssp = &ss; } } else ssp = NULL; /* * Currently glibc changes nanosecond number to microsecond. * This mean losing precision but for now it is hardly seen. */ if (tsp != NULL) { TIMESPEC_TO_TIMEVAL(&utv, tsp); if (itimerfix(&utv)) return (EINVAL); microtime(&tv0); tvp = &utv; } else tvp = NULL; error = kern_pselect(td, nfds, readfds, writefds, exceptfds, tvp, ssp, LINUX_NFDBITS); if (error == 0 && tsp != NULL) { if (td->td_retval[0] != 0) { /* * Compute how much time was left of the timeout, * by subtracting the current time and the time * before we started the call, and subtracting * that result from the user-supplied value. */ microtime(&tv1); timevalsub(&tv1, &tv0); timevalsub(&utv, &tv1); if (utv.tv_sec < 0) timevalclear(&utv); } else timevalclear(&utv); TIMEVAL_TO_TIMESPEC(&utv, tsp); } return (error); } #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) int linux_pselect6_time64(struct thread *td, struct linux_pselect6_time64_args *args) { struct l_timespec64 lts; struct timespec ts, *tsp; int error; if (args->tsp != NULL) { error = copyin(args->tsp, <s, sizeof(lts)); if (error != 0) return (error); error = linux_to_native_timespec64(&ts, <s); if (error != 0) return (error); tsp = &ts; } else tsp = NULL; error = linux_common_pselect6(td, args->nfds, args->readfds, args->writefds, args->exceptfds, tsp, args->sig); if (error != 0) return (error); if (args->tsp != NULL) { error = native_to_linux_timespec64(<s, tsp); if (error == 0) error = copyout(<s, args->tsp, sizeof(lts)); } return (error); } #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ int linux_ppoll(struct thread *td, struct linux_ppoll_args *args) { struct timespec uts, *tsp; struct l_timespec lts; int error; if (args->tsp != NULL) { error = copyin(args->tsp, <s, sizeof(lts)); if (error) return (error); error = linux_to_native_timespec(&uts, <s); if (error != 0) return (error); tsp = &uts; } else tsp = NULL; error = linux_common_ppoll(td, args->fds, args->nfds, tsp, args->sset, args->ssize); if (error != 0) return (error); if (tsp != NULL) { error = native_to_linux_timespec(<s, tsp); if (error == 0) error = copyout(<s, args->tsp, sizeof(lts)); } return (error); } static int linux_common_ppoll(struct thread *td, struct pollfd *fds, uint32_t nfds, struct timespec *tsp, l_sigset_t *sset, l_size_t ssize) { struct timespec ts0, ts1; struct pollfd stackfds[32]; struct pollfd *kfds; l_sigset_t l_ss; sigset_t *ssp; sigset_t ss; int error; if (kern_poll_maxfds(nfds)) return (EINVAL); if (sset != NULL) { if (ssize != sizeof(l_ss)) return (EINVAL); error = copyin(sset, &l_ss, sizeof(l_ss)); if (error) return (error); linux_to_bsd_sigset(&l_ss, &ss); ssp = &ss; } else ssp = NULL; if (tsp != NULL) nanotime(&ts0); if (nfds > nitems(stackfds)) kfds = mallocarray(nfds, sizeof(*kfds), M_TEMP, M_WAITOK); else kfds = stackfds; error = linux_pollin(td, kfds, fds, nfds); if (error != 0) goto out; error = kern_poll_kfds(td, kfds, nfds, tsp, ssp); if (error == 0) error = linux_pollout(td, kfds, fds, nfds); if (error == 0 && tsp != NULL) { if (td->td_retval[0]) { nanotime(&ts1); timespecsub(&ts1, &ts0, &ts1); timespecsub(tsp, &ts1, tsp); if (tsp->tv_sec < 0) timespecclear(tsp); } else timespecclear(tsp); } out: if (nfds > nitems(stackfds)) free(kfds, M_TEMP); return (error); } #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) int linux_ppoll_time64(struct thread *td, struct linux_ppoll_time64_args *args) { struct timespec uts, *tsp; struct l_timespec64 lts; int error; if (args->tsp != NULL) { error = copyin(args->tsp, <s, sizeof(lts)); if (error != 0) return (error); error = linux_to_native_timespec64(&uts, <s); if (error != 0) return (error); tsp = &uts; } else tsp = NULL; error = linux_common_ppoll(td, args->fds, args->nfds, tsp, args->sset, args->ssize); if (error != 0) return (error); if (tsp != NULL) { error = native_to_linux_timespec64(<s, tsp); if (error == 0) error = copyout(<s, args->tsp, sizeof(lts)); } return (error); } #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ static int linux_pollin(struct thread *td, struct pollfd *fds, struct pollfd *ufds, u_int nfd) { int error; u_int i; error = copyin(ufds, fds, nfd * sizeof(*fds)); if (error != 0) return (error); for (i = 0; i < nfd; i++) { if (fds->events != 0) linux_to_bsd_poll_events(td, fds->fd, fds->events, &fds->events); fds++; } return (0); } static int linux_pollout(struct thread *td, struct pollfd *fds, struct pollfd *ufds, u_int nfd) { int error = 0; u_int i, n = 0; for (i = 0; i < nfd; i++) { if (fds->revents != 0) { bsd_to_linux_poll_events(fds->revents, &fds->revents); n++; } error = copyout(&fds->revents, &ufds->revents, sizeof(ufds->revents)); if (error) return (error); fds++; ufds++; } td->td_retval[0] = n; return (0); } int linux_sched_rr_get_interval(struct thread *td, struct linux_sched_rr_get_interval_args *uap) { struct timespec ts; struct l_timespec lts; struct thread *tdt; int error; /* * According to man in case the invalid pid specified * EINVAL should be returned. */ if (uap->pid < 0) return (EINVAL); tdt = linux_tdfind(td, uap->pid, -1); if (tdt == NULL) return (ESRCH); error = kern_sched_rr_get_interval_td(td, tdt, &ts); PROC_UNLOCK(tdt->td_proc); if (error != 0) return (error); error = native_to_linux_timespec(<s, &ts); if (error != 0) return (error); return (copyout(<s, uap->interval, sizeof(lts))); } /* * In case when the Linux thread is the initial thread in * the thread group thread id is equal to the process id. * Glibc depends on this magic (assert in pthread_getattr_np.c). */ struct thread * linux_tdfind(struct thread *td, lwpid_t tid, pid_t pid) { struct linux_emuldata *em; struct thread *tdt; struct proc *p; tdt = NULL; if (tid == 0 || tid == td->td_tid) { tdt = td; PROC_LOCK(tdt->td_proc); } else if (tid > PID_MAX) tdt = tdfind(tid, pid); else { /* * Initial thread where the tid equal to the pid. */ p = pfind(tid); if (p != NULL) { if (SV_PROC_ABI(p) != SV_ABI_LINUX) { /* * p is not a Linuxulator process. */ PROC_UNLOCK(p); return (NULL); } FOREACH_THREAD_IN_PROC(p, tdt) { em = em_find(tdt); if (tid == em->em_tid) return (tdt); } PROC_UNLOCK(p); } return (NULL); } return (tdt); } void linux_to_bsd_waitopts(int options, int *bsdopts) { if (options & LINUX_WNOHANG) *bsdopts |= WNOHANG; if (options & LINUX_WUNTRACED) *bsdopts |= WUNTRACED; if (options & LINUX_WEXITED) *bsdopts |= WEXITED; if (options & LINUX_WCONTINUED) *bsdopts |= WCONTINUED; if (options & LINUX_WNOWAIT) *bsdopts |= WNOWAIT; if (options & __WCLONE) *bsdopts |= WLINUXCLONE; } int linux_getrandom(struct thread *td, struct linux_getrandom_args *args) { struct uio uio; struct iovec iov; int error; if (args->flags & ~(LINUX_GRND_NONBLOCK|LINUX_GRND_RANDOM)) return (EINVAL); if (args->count > INT_MAX) args->count = INT_MAX; iov.iov_base = args->buf; iov.iov_len = args->count; uio.uio_iov = &iov; uio.uio_iovcnt = 1; uio.uio_resid = iov.iov_len; uio.uio_segflg = UIO_USERSPACE; uio.uio_rw = UIO_READ; uio.uio_td = td; error = read_random_uio(&uio, args->flags & LINUX_GRND_NONBLOCK); if (error == 0) td->td_retval[0] = args->count - uio.uio_resid; return (error); } int linux_mincore(struct thread *td, struct linux_mincore_args *args) { /* Needs to be page-aligned */ if (args->start & PAGE_MASK) return (EINVAL); return (kern_mincore(td, args->start, args->len, args->vec)); } #define SYSLOG_TAG "<6>" int linux_syslog(struct thread *td, struct linux_syslog_args *args) { char buf[128], *src, *dst; u_int seq; int buflen, error; if (args->type != LINUX_SYSLOG_ACTION_READ_ALL) { linux_msg(td, "syslog unsupported type 0x%x", args->type); return (EINVAL); } if (args->len < 6) { td->td_retval[0] = 0; return (0); } error = priv_check(td, PRIV_MSGBUF); if (error) return (error); mtx_lock(&msgbuf_lock); msgbuf_peekbytes(msgbufp, NULL, 0, &seq); mtx_unlock(&msgbuf_lock); dst = args->buf; error = copyout(&SYSLOG_TAG, dst, sizeof(SYSLOG_TAG)); /* The -1 is to skip the trailing '\0'. */ dst += sizeof(SYSLOG_TAG) - 1; while (error == 0) { mtx_lock(&msgbuf_lock); buflen = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq); mtx_unlock(&msgbuf_lock); if (buflen == 0) break; for (src = buf; src < buf + buflen && error == 0; src++) { if (*src == '\0') continue; if (dst >= args->buf + args->len) goto out; error = copyout(src, dst, 1); dst++; if (*src == '\n' && *(src + 1) != '<' && dst + sizeof(SYSLOG_TAG) < args->buf + args->len) { error = copyout(&SYSLOG_TAG, dst, sizeof(SYSLOG_TAG)); dst += sizeof(SYSLOG_TAG) - 1; } } } out: td->td_retval[0] = dst - args->buf; return (error); } int linux_getcpu(struct thread *td, struct linux_getcpu_args *args) { int cpu, error, node; cpu = td->td_oncpu; /* Make sure it doesn't change during copyout(9) */ error = 0; node = cpuid_to_pcpu[cpu]->pc_domain; if (args->cpu != NULL) error = copyout(&cpu, args->cpu, sizeof(l_int)); if (args->node != NULL) error = copyout(&node, args->node, sizeof(l_int)); return (error); } #if defined(__i386__) || defined(__amd64__) int linux_poll(struct thread *td, struct linux_poll_args *args) { struct timespec ts, *tsp; if (args->timeout != INFTIM) { if (args->timeout < 0) return (EINVAL); ts.tv_sec = args->timeout / 1000; ts.tv_nsec = (args->timeout % 1000) * 1000000; tsp = &ts; } else tsp = NULL; return (linux_common_ppoll(td, args->fds, args->nfds, tsp, NULL, 0)); } #endif /* __i386__ || __amd64__ */ diff --git a/sys/compat/linux/linux_misc.h b/sys/compat/linux/linux_misc.h index bd8b2f3f63b4..dc17ed430014 100644 --- a/sys/compat/linux/linux_misc.h +++ b/sys/compat/linux/linux_misc.h @@ -1,189 +1,187 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2006 Roman Divacky * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _LINUX_MISC_H_ #define _LINUX_MISC_H_ #include /* bits per mask */ #define LINUX_NFDBITS sizeof(l_fd_mask) * 8 /* * Miscellaneous */ #define LINUX_NAME_MAX 255 #define LINUX_MAX_UTSNAME 65 #define LINUX_CTL_MAXNAME 10 /* defines for prctl */ #define LINUX_PR_SET_PDEATHSIG 1 /* Second arg is a signal. */ #define LINUX_PR_GET_PDEATHSIG 2 /* * Second arg is a ptr to return the * signal. */ #define LINUX_PR_GET_DUMPABLE 3 #define LINUX_PR_SET_DUMPABLE 4 #define LINUX_PR_GET_KEEPCAPS 7 /* Get drop capabilities on setuid */ #define LINUX_PR_SET_KEEPCAPS 8 /* Set drop capabilities on setuid */ #define LINUX_PR_SET_NAME 15 /* Set process name. */ #define LINUX_PR_GET_NAME 16 /* Get process name. */ #define LINUX_PR_GET_SECCOMP 21 #define LINUX_PR_SET_SECCOMP 22 #define LINUX_PR_CAPBSET_READ 23 #define LINUX_PR_SET_NO_NEW_PRIVS 38 #define LINUX_PR_SET_PTRACER 1499557217 #define LINUX_MAX_COMM_LEN 16 /* Maximum length of the process name. */ /* For GET/SET DUMPABLE */ #define LINUX_SUID_DUMP_DISABLE 0 /* Don't coredump setuid processes. */ #define LINUX_SUID_DUMP_USER 1 /* Dump as user of process. */ #define LINUX_SUID_DUMP_ROOT 2 /* Dump as root. */ #define LINUX_MREMAP_MAYMOVE 1 #define LINUX_MREMAP_FIXED 2 #define LINUX_PATH_MAX 4096 -extern const char *linux_kplatform; - /* * Non-standard aux entry types used in Linux ELF binaries. */ #define LINUX_AT_PLATFORM 15 /* String identifying CPU */ #define LINUX_AT_HWCAP 16 /* CPU capabilities */ #define LINUX_AT_CLKTCK 17 /* frequency at which times() increments */ #define LINUX_AT_SECURE 23 /* secure mode boolean */ #define LINUX_AT_BASE_PLATFORM 24 /* string identifying real platform, may * differ from AT_PLATFORM. */ #define LINUX_AT_RANDOM 25 /* address of random bytes */ #define LINUX_AT_HWCAP2 26 /* CPU capabilities, second part */ #define LINUX_AT_EXECFN 31 /* filename of program */ #define LINUX_AT_SYSINFO 32 /* vsyscall */ #define LINUX_AT_SYSINFO_EHDR 33 /* vdso header */ #define LINUX_AT_RANDOM_LEN 16 /* size of random bytes */ /* Linux sets the i387 to extended precision. */ #if defined(__i386__) || defined(__amd64__) #define __LINUX_NPXCW__ 0x37f #endif #define LINUX_CLONE_VM 0x00000100 #define LINUX_CLONE_FS 0x00000200 #define LINUX_CLONE_FILES 0x00000400 #define LINUX_CLONE_SIGHAND 0x00000800 #define LINUX_CLONE_PID 0x00001000 /* No longer exist in Linux */ #define LINUX_CLONE_PTRACE 0x00002000 #define LINUX_CLONE_VFORK 0x00004000 #define LINUX_CLONE_PARENT 0x00008000 #define LINUX_CLONE_THREAD 0x00010000 #define LINUX_CLONE_NEWNS 0x00020000 /* New mount NS */ #define LINUX_CLONE_SYSVSEM 0x00040000 #define LINUX_CLONE_SETTLS 0x00080000 #define LINUX_CLONE_PARENT_SETTID 0x00100000 #define LINUX_CLONE_CHILD_CLEARTID 0x00200000 #define LINUX_CLONE_DETACHED 0x00400000 /* Unused */ #define LINUX_CLONE_UNTRACED 0x00800000 #define LINUX_CLONE_CHILD_SETTID 0x01000000 #define LINUX_CLONE_NEWCGROUP 0x02000000 /* New cgroup NS */ #define LINUX_CLONE_NEWUTS 0x04000000 #define LINUX_CLONE_NEWIPC 0x08000000 #define LINUX_CLONE_NEWUSER 0x10000000 #define LINUX_CLONE_NEWPID 0x20000000 #define LINUX_CLONE_NEWNET 0x40000000 #define LINUX_CLONE_IO 0x80000000 /* Scheduling policies */ #define LINUX_SCHED_OTHER 0 #define LINUX_SCHED_FIFO 1 #define LINUX_SCHED_RR 2 #define LINUX_MAX_RT_PRIO 100 struct l_new_utsname { char sysname[LINUX_MAX_UTSNAME]; char nodename[LINUX_MAX_UTSNAME]; char release[LINUX_MAX_UTSNAME]; char version[LINUX_MAX_UTSNAME]; char machine[LINUX_MAX_UTSNAME]; char domainname[LINUX_MAX_UTSNAME]; }; #define LINUX_UTIME_NOW 0x3FFFFFFF #define LINUX_UTIME_OMIT 0x3FFFFFFE extern int stclohz; #define LINUX_WNOHANG 0x00000001 #define LINUX_WUNTRACED 0x00000002 #define LINUX_WSTOPPED LINUX_WUNTRACED #define LINUX_WEXITED 0x00000004 #define LINUX_WCONTINUED 0x00000008 #define LINUX_WNOWAIT 0x01000000 #define __WNOTHREAD 0x20000000 #define __WALL 0x40000000 #define __WCLONE 0x80000000 /* Linux waitid idtype */ #define LINUX_P_ALL 0 #define LINUX_P_PID 1 #define LINUX_P_PGID 2 #define LINUX_RLIMIT_LOCKS 10 #define LINUX_RLIMIT_SIGPENDING 11 #define LINUX_RLIMIT_MSGQUEUE 12 #define LINUX_RLIMIT_NICE 13 #define LINUX_RLIMIT_RTPRIO 14 #define LINUX_RLIMIT_RTTIME 15 #define LINUX_RLIM_INFINITY (~0UL) /* Linux getrandom flags */ #define LINUX_GRND_NONBLOCK 0x0001 #define LINUX_GRND_RANDOM 0x0002 /* Linux syslog flags */ #define LINUX_SYSLOG_ACTION_READ_ALL 3 #if defined(__amd64__) && !defined(COMPAT_LINUX32) int linux_ptrace_status(struct thread *td, int pid, int status); #endif void linux_to_bsd_waitopts(int options, int *bsdopts); int linux_set_upcall(struct thread *td, register_t stack); int linux_set_cloned_tls(struct thread *td, void *desc); struct thread *linux_tdfind(struct thread *, lwpid_t, pid_t); #endif /* _LINUX_MISC_H_ */ diff --git a/sys/i386/linux/linux_locore.asm b/sys/i386/linux/linux_locore.asm index 8c2499af872e..11427345f7ce 100644 --- a/sys/i386/linux/linux_locore.asm +++ b/sys/i386/linux/linux_locore.asm @@ -1,149 +1,157 @@ /* $FreeBSD$ */ #include "linux_assym.h" /* system definitions */ #include /* miscellaneous asm macros */ #include /* system call numbers */ #include "assym.inc" + .data + + .globl linux_platform +linux_platform: + .asciz "i686" + + .text + /* * To avoid excess stack frame the signal trampoline code emulates * the 'call' instruction. */ NON_GPROF_ENTRY(linux_sigcode) movl %esp, %ebx /* preserve sigframe */ call .getip0 .getip0: popl %eax add $.startsigcode-.getip0, %eax /* ret address */ push %eax jmp *LINUX_SIGF_HANDLER(%ebx) .startsigcode: popl %eax /* gcc unwind code need this */ movl $LINUX_SYS_linux_sigreturn,%eax /* linux_sigreturn() */ int $0x80 /* enter kernel with args */ .endsigcode: 0: jmp 0b NON_GPROF_ENTRY(linux_rt_sigcode) leal LINUX_RT_SIGF_UC(%esp),%ebx /* linux ucp */ leal LINUX_RT_SIGF_SC(%ebx),%ecx /* linux sigcontext */ movl %esp, %edi call .getip1 .getip1: popl %eax add $.startrtsigcode-.getip1, %eax /* ret address */ push %eax jmp *LINUX_RT_SIGF_HANDLER(%edi) .startrtsigcode: movl $LINUX_SYS_linux_rt_sigreturn,%eax /* linux_rt_sigreturn() */ int $0x80 /* enter kernel with args */ .endrtsigcode: 0: jmp 0b NON_GPROF_ENTRY(linux_vsyscall) .startvsyscall: int $0x80 ret .endvsyscall: #if 0 .section .note.Linux, "a",@note .long 2f - 1f /* namesz */ .balign 4 .long 4f - 3f /* descsz */ .long 0 1: .asciz "Linux" 2: .balign 4 3: .long LINUX_VERSION_CODE 4: .balign 4 .previous #endif #define do_cfa_expr(offset) \ .byte 0x0f; /* DW_CFA_def_cfa_expression */ \ .uleb128 11f-10f; /* length */ \ 10: .byte 0x74; /* DW_OP_breg4 */ \ .sleb128 offset; /* offset */ \ .byte 0x06; /* DW_OP_deref */ \ 11: /* CIE */ .section .eh_frame,"a",@progbits .LSTARTFRAMEDLSI1: .long .LENDCIEDLSI1-.LSTARTCIEDLSI1 .LSTARTCIEDLSI1: .long 0 /* CIE ID */ .byte 1 /* Version number */ .string "zRS" /* NULL-terminated * augmentation string */ .uleb128 1 /* Code alignment factor */ .sleb128 -4 /* Data alignment factor */ .byte 8 /* Return address * register column */ .uleb128 1 /* Augmentation value length */ .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ .byte 0 /* DW_CFA_nop */ .align 4 .LENDCIEDLSI1: /* FDE */ .long .LENDFDEDLSI1-.LSTARTFDEDLSI1 /* Length FDE */ .LSTARTFDEDLSI1: .long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */ .long .startsigcode-. /* PC-relative start address */ .long .endsigcode-.startsigcode .uleb128 0 /* Augmentation */ do_cfa_expr(LINUX_SIGF_SC-8) .align 4 .LENDFDEDLSI1: .long .LENDFDEDLSI2-.LSTARTFDEDLSI2 /* Length FDE */ .LSTARTFDEDLSI2: .long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1 /* CIE pointer */ .long .startrtsigcode-. /* PC-relative start address */ .long .endrtsigcode-.startrtsigcode .uleb128 0 /* Augmentation */ do_cfa_expr(LINUX_RT_SIGF_SC-4+LINUX_SC_ESP) .align 4 .LENDFDEDLSI2: .previous .section .eh_frame,"a",@progbits .LSTARTFRAMEDLSI2: .long .LENDCIEDLSI2-.LSTARTCIEDLSI2 .LSTARTCIEDLSI2: .long 0 /* CIE ID */ .byte 1 /* Version number */ .string "zR" /* NULL-terminated * augmentation string */ .uleb128 1 /* Code alignment factor */ .sleb128 -4 /* Data alignment factor */ .byte 8 /* Return address register column */ .uleb128 1 /* Augmentation value length */ .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ .byte 0x0c /* DW_CFA_def_cfa */ .uleb128 4 .uleb128 4 .byte 0x88 /* DW_CFA_offset, column 0x8 */ .uleb128 1 .align 4 .LENDCIEDLSI2: .long .LENDFDEDLSI3-.LSTARTFDEDLSI3 /* Length FDE */ .LSTARTFDEDLSI3: .long .LSTARTFDEDLSI3-.LSTARTFRAMEDLSI2 /* CIE pointer */ .long .startvsyscall-. /* PC-relative start address */ .long .endvsyscall-.startvsyscall .uleb128 0 .align 4 .LENDFDEDLSI3: .previous diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c index ed7223f3681a..e01526d9b8b0 100644 --- a/sys/i386/linux/linux_sysvec.c +++ b/sys/i386/linux/linux_sysvec.c @@ -1,1096 +1,1063 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1994-1996 Søren Schmidt * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_VERSION(linux, 1); #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) static int linux_szsigcode; static vm_object_t linux_shared_page_obj; static char *linux_shared_page_mapping; extern char _binary_linux_locore_o_start; extern char _binary_linux_locore_o_end; extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); static int linux_fixup(uintptr_t *stack_base, struct image_params *iparams); static int linux_fixup_elf(uintptr_t *stack_base, struct image_params *iparams); static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack); static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base); static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); static void linux_vdso_install(void *param); static void linux_vdso_deinstall(void *param); -static int linux_szplatform; -const char *linux_kplatform; - #define LINUX_T_UNKNOWN 255 static int _bsd_to_linux_trapcode[] = { LINUX_T_UNKNOWN, /* 0 */ 6, /* 1 T_PRIVINFLT */ LINUX_T_UNKNOWN, /* 2 */ 3, /* 3 T_BPTFLT */ LINUX_T_UNKNOWN, /* 4 */ LINUX_T_UNKNOWN, /* 5 */ 16, /* 6 T_ARITHTRAP */ 254, /* 7 T_ASTFLT */ LINUX_T_UNKNOWN, /* 8 */ 13, /* 9 T_PROTFLT */ 1, /* 10 T_TRCTRAP */ LINUX_T_UNKNOWN, /* 11 */ 14, /* 12 T_PAGEFLT */ LINUX_T_UNKNOWN, /* 13 */ 17, /* 14 T_ALIGNFLT */ LINUX_T_UNKNOWN, /* 15 */ LINUX_T_UNKNOWN, /* 16 */ LINUX_T_UNKNOWN, /* 17 */ 0, /* 18 T_DIVIDE */ 2, /* 19 T_NMI */ 4, /* 20 T_OFLOW */ 5, /* 21 T_BOUND */ 7, /* 22 T_DNA */ 8, /* 23 T_DOUBLEFLT */ 9, /* 24 T_FPOPFLT */ 10, /* 25 T_TSSFLT */ 11, /* 26 T_SEGNPFLT */ 12, /* 27 T_STKFLT */ 18, /* 28 T_MCHK */ 19, /* 29 T_XMMFLT */ 15 /* 30 T_RESERVED */ }; #define bsd_to_linux_trapcode(code) \ ((code)args->argc + 1); base--; suword(base, (intptr_t)envp); base--; suword(base, (intptr_t)argv); base--; suword(base, imgp->args->argc); *stack_base = (uintptr_t)base; return (0); } static int linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) { struct proc *p; Elf32_Auxargs *args; Elf32_Auxinfo *argarray, *pos; - Elf32_Addr *uplatform; struct ps_strings *arginfo; int error, issetugid; p = imgp->proc; issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); - uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); args = (Elf32_Auxargs *)imgp->auxargs; argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, M_WAITOK | M_ZERO); AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, imgp->proc->p_sysent->sv_shared_page_base); AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); /* * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, * as it has appeared in the 2.4.0-rc7 first time. * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), * glibc falls back to the hard-coded CLK_TCK value when aux entry * is not present. * Also see linux_times() implementation. */ if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); AUXARGS_ENTRY(pos, AT_PHENT, args->phent); AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); AUXARGS_ENTRY(pos, AT_BASE, args->base); AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); - AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); + AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); if (imgp->execpathp != 0) AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); if (args->execfd != -1) AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); AUXARGS_ENTRY(pos, AT_NULL, 0); free(imgp->auxargs, M_TEMP); imgp->auxargs = NULL; KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); error = copyout(argarray, (void *)base, sizeof(*argarray) * LINUX_AT_COUNT); free(argarray, M_TEMP); return (error); } static int linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) { register_t *base; base = (register_t *)*stack_base; base--; if (suword(base, (register_t)imgp->args->argc) == -1) return (EFAULT); *stack_base = (uintptr_t)base; return (0); } /* * Copied from kern/kern_exec.c */ static int linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) { int argc, envc, error; char **vectp; char *stringp; uintptr_t destp, ustringp; struct ps_strings *arginfo; char canary[LINUX_AT_RANDOM_LEN]; size_t execpath_len; struct proc *p; p = imgp->proc; arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); destp = (uintptr_t)arginfo; - /* Install LINUX_PLATFORM. */ - destp -= linux_szplatform; - destp = rounddown2(destp, sizeof(void *)); - error = copyout(linux_kplatform, (void *)destp, linux_szplatform); - if (error != 0) - return (error); - if (imgp->execpath != NULL && imgp->auxargs != NULL) { execpath_len = strlen(imgp->execpath) + 1; destp -= execpath_len; destp = rounddown2(destp, sizeof(void *)); imgp->execpathp = (void *)destp; error = copyout(imgp->execpath, imgp->execpathp, execpath_len); if (error != 0) return (error); } /* Prepare the canary for SSP. */ arc4rand(canary, sizeof(canary), 0); destp -= roundup(sizeof(canary), sizeof(void *)); imgp->canary = (void *)destp; error = copyout(canary, imgp->canary, sizeof(canary)); if (error != 0) return (error); /* Allocate room for the argument and environment strings. */ destp -= ARG_MAX - imgp->args->stringspace; destp = rounddown2(destp, sizeof(void *)); ustringp = destp; if (imgp->auxargs) { /* * Allocate room on the stack for the ELF auxargs * array. It has LINUX_AT_COUNT entries. */ destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); destp = rounddown2(destp, sizeof(void *)); } vectp = (char **)destp; /* * Allocate room for the argv[] and env vectors including the * terminating NULL pointers. */ vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; /* vectp also becomes our initial stack base. */ *stack_base = (uintptr_t)vectp; stringp = imgp->args->begin_argv; argc = imgp->args->argc; envc = imgp->args->envc; /* Copy out strings - arguments and environment. */ error = copyout(stringp, (void *)ustringp, ARG_MAX - imgp->args->stringspace); if (error != 0) return (error); /* Fill in "ps_strings" struct for ps, w, etc. */ if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || suword(&arginfo->ps_nargvstr, argc) != 0) return (EFAULT); /* Fill in argument portion of vector table. */ for (; argc > 0; --argc) { if (suword(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* A null vector table pointer separates the argp's from the envp's. */ if (suword(vectp++, 0) != 0) return (EFAULT); if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || suword(&arginfo->ps_nenvstr, envc) != 0) return (EFAULT); /* Fill in environment portion of vector table. */ for (; envc > 0; --envc) { if (suword(vectp++, ustringp) != 0) return (EFAULT); while (*stringp++ != 0) ustringp++; ustringp++; } /* The end of the vector table is a null pointer. */ if (suword(vectp, 0) != 0) return (EFAULT); if (imgp->auxargs) { vectp++; error = imgp->sysent->sv_copyout_auxargs(imgp, (uintptr_t)vectp); if (error != 0) return (error); } return (0); } static void linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct thread *td = curthread; struct proc *p = td->td_proc; struct sigacts *psp; struct trapframe *regs; struct l_rt_sigframe *fp, frame; int sig, code; int oonstack; sig = ksi->ksi_signo; code = ksi->ksi_code; PROC_LOCK_ASSERT(p, MA_OWNED); psp = p->p_sigacts; mtx_assert(&psp->ps_mtx, MA_OWNED); regs = td->td_frame; oonstack = sigonstack(regs->tf_esp); /* Allocate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); } else fp = (struct l_rt_sigframe *)regs->tf_esp - 1; mtx_unlock(&psp->ps_mtx); /* Build the argument list for the signal handler. */ sig = bsd_to_linux_signal(sig); bzero(&frame, sizeof(frame)); frame.sf_handler = catcher; frame.sf_sig = sig; frame.sf_siginfo = &fp->sf_si; frame.sf_ucontext = &fp->sf_sc; /* Fill in POSIX parts. */ siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); /* Build the signal context to be used by sigreturn. */ frame.sf_sc.uc_flags = 0; /* XXX ??? */ frame.sf_sc.uc_link = NULL; /* XXX ??? */ frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; PROC_UNLOCK(p); bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; frame.sf_sc.uc_mcontext.sc_gs = rgs(); frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); if (copyout(&frame, fp, sizeof(frame)) != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ PROC_LOCK(p); sigexit(td, SIGILL); } /* Build context to run handler in. */ regs->tf_esp = (int)fp; regs->tf_eip = linux_rt_sigcode; regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); regs->tf_cs = _ucodesel; regs->tf_ds = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _udatasel; regs->tf_ss = _udatasel; PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * in u. to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct thread *td = curthread; struct proc *p = td->td_proc; struct sigacts *psp; struct trapframe *regs; struct l_sigframe *fp, frame; l_sigset_t lmask; int sig, code; int oonstack; PROC_LOCK_ASSERT(p, MA_OWNED); psp = p->p_sigacts; sig = ksi->ksi_signo; code = ksi->ksi_code; mtx_assert(&psp->ps_mtx, MA_OWNED); if (SIGISMEMBER(psp->ps_siginfo, sig)) { /* Signal handler installed with SA_SIGINFO. */ linux_rt_sendsig(catcher, ksi, mask); return; } regs = td->td_frame; oonstack = sigonstack(regs->tf_esp); /* Allocate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - sizeof(struct l_sigframe)); } else fp = (struct l_sigframe *)regs->tf_esp - 1; mtx_unlock(&psp->ps_mtx); PROC_UNLOCK(p); /* Build the argument list for the signal handler. */ sig = bsd_to_linux_signal(sig); bzero(&frame, sizeof(frame)); frame.sf_handler = catcher; frame.sf_sig = sig; bsd_to_linux_sigset(mask, &lmask); /* Build the signal context to be used by sigreturn. */ frame.sf_sc.sc_mask = lmask.__mask; frame.sf_sc.sc_gs = rgs(); frame.sf_sc.sc_fs = regs->tf_fs; frame.sf_sc.sc_es = regs->tf_es; frame.sf_sc.sc_ds = regs->tf_ds; frame.sf_sc.sc_edi = regs->tf_edi; frame.sf_sc.sc_esi = regs->tf_esi; frame.sf_sc.sc_ebp = regs->tf_ebp; frame.sf_sc.sc_ebx = regs->tf_ebx; frame.sf_sc.sc_esp = regs->tf_esp; frame.sf_sc.sc_edx = regs->tf_edx; frame.sf_sc.sc_ecx = regs->tf_ecx; frame.sf_sc.sc_eax = regs->tf_eax; frame.sf_sc.sc_eip = regs->tf_eip; frame.sf_sc.sc_cs = regs->tf_cs; frame.sf_sc.sc_eflags = regs->tf_eflags; frame.sf_sc.sc_esp_at_signal = regs->tf_esp; frame.sf_sc.sc_ss = regs->tf_ss; frame.sf_sc.sc_err = regs->tf_err; frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); frame.sf_extramask[0] = lmask.__mask; if (copyout(&frame, fp, sizeof(frame)) != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ PROC_LOCK(p); sigexit(td, SIGILL); } /* Build context to run handler in. */ regs->tf_esp = (int)fp; regs->tf_eip = linux_sigcode; regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); regs->tf_cs = _ucodesel; regs->tf_ds = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _udatasel; regs->tf_ss = _udatasel; PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. */ int linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) { struct l_sigframe frame; struct trapframe *regs; l_sigset_t lmask; sigset_t bmask; int eflags; ksiginfo_t ksi; regs = td->td_frame; /* * The trampoline code hands us the sigframe. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ if (copyin(args->sfp, &frame, sizeof(frame)) != 0) return (EFAULT); /* Check for security violations. */ #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) eflags = frame.sf_sc.sc_eflags; if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) return (EINVAL); /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) if (!CS_SECURE(frame.sf_sc.sc_cs)) { ksiginfo_init_trap(&ksi); ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; ksi.ksi_trapno = T_PROTFLT; ksi.ksi_addr = (void *)regs->tf_eip; trapsignal(td, &ksi); return (EINVAL); } lmask.__mask = frame.sf_sc.sc_mask; linux_to_bsd_sigset(&lmask, &bmask); kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); /* Restore signal context. */ /* %gs was restored by the trampoline. */ regs->tf_fs = frame.sf_sc.sc_fs; regs->tf_es = frame.sf_sc.sc_es; regs->tf_ds = frame.sf_sc.sc_ds; regs->tf_edi = frame.sf_sc.sc_edi; regs->tf_esi = frame.sf_sc.sc_esi; regs->tf_ebp = frame.sf_sc.sc_ebp; regs->tf_ebx = frame.sf_sc.sc_ebx; regs->tf_edx = frame.sf_sc.sc_edx; regs->tf_ecx = frame.sf_sc.sc_ecx; regs->tf_eax = frame.sf_sc.sc_eax; regs->tf_eip = frame.sf_sc.sc_eip; regs->tf_cs = frame.sf_sc.sc_cs; regs->tf_eflags = eflags; regs->tf_esp = frame.sf_sc.sc_esp_at_signal; regs->tf_ss = frame.sf_sc.sc_ss; return (EJUSTRETURN); } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by rt_sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. */ int linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) { struct l_ucontext uc; struct l_sigcontext *context; sigset_t bmask; l_stack_t *lss; stack_t ss; struct trapframe *regs; int eflags; ksiginfo_t ksi; regs = td->td_frame; /* * The trampoline code hands us the ucontext. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ if (copyin(args->ucp, &uc, sizeof(uc)) != 0) return (EFAULT); context = &uc.uc_mcontext; /* Check for security violations. */ #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) eflags = context->sc_eflags; if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) return (EINVAL); /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) if (!CS_SECURE(context->sc_cs)) { ksiginfo_init_trap(&ksi); ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; ksi.ksi_trapno = T_PROTFLT; ksi.ksi_addr = (void *)regs->tf_eip; trapsignal(td, &ksi); return (EINVAL); } linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); /* Restore signal context. */ /* %gs was restored by the trampoline. */ regs->tf_fs = context->sc_fs; regs->tf_es = context->sc_es; regs->tf_ds = context->sc_ds; regs->tf_edi = context->sc_edi; regs->tf_esi = context->sc_esi; regs->tf_ebp = context->sc_ebp; regs->tf_ebx = context->sc_ebx; regs->tf_edx = context->sc_edx; regs->tf_ecx = context->sc_ecx; regs->tf_eax = context->sc_eax; regs->tf_eip = context->sc_eip; regs->tf_cs = context->sc_cs; regs->tf_eflags = eflags; regs->tf_esp = context->sc_esp_at_signal; regs->tf_ss = context->sc_ss; /* Call sigaltstack & ignore results. */ lss = &uc.uc_stack; ss.ss_sp = lss->ss_sp; ss.ss_size = lss->ss_size; ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); (void)kern_sigaltstack(td, &ss, NULL); return (EJUSTRETURN); } static int linux_fetch_syscall_args(struct thread *td) { struct proc *p; struct trapframe *frame; struct syscall_args *sa; p = td->td_proc; frame = td->td_frame; sa = &td->td_sa; sa->code = frame->tf_eax; sa->args[0] = frame->tf_ebx; sa->args[1] = frame->tf_ecx; sa->args[2] = frame->tf_edx; sa->args[3] = frame->tf_esi; sa->args[4] = frame->tf_edi; sa->args[5] = frame->tf_ebp; /* Unconfirmed */ if (sa->code >= p->p_sysent->sv_size) /* nosys */ sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; else sa->callp = &p->p_sysent->sv_table[sa->code]; td->td_retval[0] = 0; td->td_retval[1] = frame->tf_edx; return (0); } static void linux_set_syscall_retval(struct thread *td, int error) { struct trapframe *frame = td->td_frame; cpu_set_syscall_retval(td, error); if (__predict_false(error != 0)) { if (error != ERESTART && error != EJUSTRETURN) frame->tf_eax = bsd_to_linux_errno(error); } } /* * exec_setregs may initialize some registers differently than Linux * does, thus potentially confusing Linux binaries. If necessary, we * override the exec_setregs default(s) here. */ static void linux_exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) { struct pcb *pcb = td->td_pcb; exec_setregs(td, imgp, stack); /* Linux sets %gs to 0, we default to _udatasel. */ pcb->pcb_gs = 0; load_gs(0); pcb->pcb_initial_npxcw = __LINUX_NPXCW__; } -static void -linux_get_machine(const char **dst) -{ - - switch (cpu_class) { - case CPUCLASS_686: - *dst = "i686"; - break; - case CPUCLASS_586: - *dst = "i586"; - break; - case CPUCLASS_486: - *dst = "i486"; - break; - default: - *dst = "i386"; - } -} - struct sysentvec linux_sysvec = { .sv_size = LINUX_SYS_MAXSYSCALL, .sv_table = linux_sysent, .sv_transtrap = linux_translate_traps, .sv_fixup = linux_fixup, .sv_sendsig = linux_sendsig, .sv_sigcode = &_binary_linux_locore_o_start, .sv_szsigcode = &linux_szsigcode, .sv_name = "Linux a.out", .sv_coredump = NULL, .sv_imgact_try = linux_exec_imgact_try, .sv_minsigstksz = LINUX_MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = LINUX_USRSTACK, .sv_psstrings = PS_STRINGS, .sv_psstringssz = sizeof(struct ps_strings), .sv_stackprot = VM_PROT_ALL, .sv_copyout_strings = exec_copyout_strings, .sv_setregs = linux_exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 | SV_SIG_DISCIGN | SV_SIG_WAITNDQ, .sv_set_syscall_retval = linux_set_syscall_retval, .sv_fetch_syscall_args = linux_fetch_syscall_args, .sv_syscallnames = NULL, .sv_shared_page_base = LINUX_SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = linux_schedtail, .sv_thread_detach = linux_thread_detach, .sv_trap = NULL, .sv_onexec = linux_on_exec, .sv_onexit = linux_on_exit, .sv_ontdexit = linux_thread_dtor, .sv_setid_allowed = &linux_setid_allowed_query, }; INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); struct sysentvec elf_linux_sysvec = { .sv_size = LINUX_SYS_MAXSYSCALL, .sv_table = linux_sysent, .sv_transtrap = linux_translate_traps, .sv_fixup = linux_fixup_elf, .sv_sendsig = linux_sendsig, .sv_sigcode = &_binary_linux_locore_o_start, .sv_szsigcode = &linux_szsigcode, .sv_name = "Linux ELF32", .sv_coredump = elf32_coredump, .sv_elf_core_osabi = ELFOSABI_FREEBSD, .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, .sv_elf_core_prepare_notes = elf32_prepare_notes, .sv_imgact_try = linux_exec_imgact_try, .sv_minsigstksz = LINUX_MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = LINUX_USRSTACK, .sv_psstrings = LINUX_PS_STRINGS, .sv_psstringssz = sizeof(struct ps_strings), .sv_stackprot = VM_PROT_ALL, .sv_copyout_auxargs = linux_copyout_auxargs, .sv_copyout_strings = linux_copyout_strings, .sv_setregs = linux_exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP | SV_SIG_DISCIGN | SV_SIG_WAITNDQ, .sv_set_syscall_retval = linux_set_syscall_retval, .sv_fetch_syscall_args = linux_fetch_syscall_args, .sv_syscallnames = NULL, .sv_shared_page_base = LINUX_SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = linux_schedtail, .sv_thread_detach = linux_thread_detach, .sv_trap = NULL, .sv_onexec = linux_on_exec, .sv_onexit = linux_on_exit, .sv_ontdexit = linux_thread_dtor, .sv_setid_allowed = &linux_setid_allowed_query, }; static void linux_vdso_install(void *param) { linux_szsigcode = (&_binary_linux_locore_o_end - &_binary_linux_locore_o_start); if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) panic("Linux invalid vdso size\n"); __elfN(linux_vdso_fixup)(&elf_linux_sysvec); linux_shared_page_obj = __elfN(linux_shared_page_init) (&linux_shared_page_mapping); __elfN(linux_vdso_reloc)(&elf_linux_sysvec); bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, linux_szsigcode); elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; } SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, linux_vdso_install, NULL); static void linux_vdso_deinstall(void *param) { __elfN(linux_shared_page_fini)(linux_shared_page_obj, linux_shared_page_mapping); } SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, linux_vdso_deinstall, NULL); static char GNU_ABI_VENDOR[] = "GNU"; static int GNULINUX_ABI_DESC = 0; static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel) { const Elf32_Word *desc; uintptr_t p; p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); desc = (const Elf32_Word *)p; if (desc[0] != GNULINUX_ABI_DESC) return (false); /* * For Linux we encode osrel using the Linux convention of * (version << 16) | (major << 8) | (minor) * See macro in linux_mib.h */ *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); return (true); } static Elf_Brandnote linux_brandnote = { .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), .hdr.n_descsz = 16, /* XXX at least 16 */ .hdr.n_type = 1, .vendor = GNU_ABI_VENDOR, .flags = BN_TRANSLATE_OSREL, .trans_osrel = linux_trans_osrel }; static Elf32_Brandinfo linux_brand = { .brand = ELFOSABI_LINUX, .machine = EM_386, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-linux.so.1", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; static Elf32_Brandinfo linux_glibc2brand = { .brand = ELFOSABI_LINUX, .machine = EM_386, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-linux.so.2", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; static Elf32_Brandinfo linux_muslbrand = { .brand = ELFOSABI_LINUX, .machine = EM_386, .compat_3_brand = "Linux", .emul_path = linux_emul_path, .interp_path = "/lib/ld-musl-i386.so.1", .sysvec = &elf_linux_sysvec, .interp_newpath = NULL, .brand_note = &linux_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; Elf32_Brandinfo *linux_brandlist[] = { &linux_brand, &linux_glibc2brand, &linux_muslbrand, NULL }; static int linux_elf_modevent(module_t mod, int type, void *data) { Elf32_Brandinfo **brandinfo; int error; struct linux_ioctl_handler **lihp; error = 0; switch(type) { case MOD_LOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf32_insert_brand_entry(*brandinfo) < 0) error = EINVAL; if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux_ioctl_register_handler(*lihp); LIST_INIT(&futex_list); mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); - linux_get_machine(&linux_kplatform); - linux_szplatform = roundup(strlen(linux_kplatform) + 1, - sizeof(char *)); linux_dev_shm_create(); linux_osd_jail_register(); stclohz = (stathz ? stathz : hz); if (bootverbose) printf("Linux ELF exec handler installed\n"); } else printf("cannot insert Linux ELF brand handler\n"); break; case MOD_UNLOAD: for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf32_brand_inuse(*brandinfo)) error = EBUSY; if (error == 0) { for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; ++brandinfo) if (elf32_remove_brand_entry(*brandinfo) < 0) error = EINVAL; } if (error == 0) { SET_FOREACH(lihp, linux_ioctl_handler_set) linux_ioctl_unregister_handler(*lihp); mtx_destroy(&futex_mtx); linux_dev_shm_destroy(); linux_osd_jail_deregister(); if (bootverbose) printf("Linux ELF exec handler removed\n"); } else printf("Could not deinstall ELF interpreter entry\n"); break; default: return (EOPNOTSUPP); } return (error); } static moduledata_t linux_elf_mod = { "linuxelf", linux_elf_modevent, 0 }; DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); FEATURE(linux, "Linux 32bit support");