Index: stable/12/sys/arm64/arm64/elf_machdep.c =================================================================== --- stable/12/sys/arm64/arm64/elf_machdep.c (revision 354259) +++ stable/12/sys/arm64/arm64/elf_machdep.c (revision 354260) @@ -1,230 +1,215 @@ /*- * Copyright (c) 2014, 2015 The FreeBSD Foundation. * Copyright (c) 2014 Andrew Turner. * All rights reserved. * * This software was developed by Andrew Turner under * sponsorship from the FreeBSD Foundation. * * Portions of this software were developed by Konstantin Belousov * under sponsorship from the FreeBSD Foundation. * * 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 "linker_if.h" static struct sysentvec elf64_freebsd_sysvec = { .sv_size = SYS_MAXSYSCALL, .sv_table = sysent, .sv_mask = 0, .sv_errsize = 0, .sv_errtbl = NULL, .sv_transtrap = NULL, .sv_fixup = __elfN(freebsd_fixup), .sv_sendsig = sendsig, .sv_sigcode = sigcode, .sv_szsigcode = &szsigcode, .sv_name = "FreeBSD ELF64", .sv_coredump = __elfN(coredump), .sv_imgact_try = NULL, .sv_minsigstksz = MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = USRSTACK, .sv_psstrings = PS_STRINGS, .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, .sv_copyout_strings = exec_copyout_strings, .sv_setregs = exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 | SV_ASLR, .sv_set_syscall_retval = cpu_set_syscall_retval, .sv_fetch_syscall_args = cpu_fetch_syscall_args, .sv_syscallnames = syscallnames, .sv_shared_page_base = SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = NULL, .sv_thread_detach = NULL, .sv_trap = NULL, }; INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); static Elf64_Brandinfo freebsd_brand_info = { .brand = ELFOSABI_FREEBSD, .machine = EM_AARCH64, .compat_3_brand = "FreeBSD", .emul_path = NULL, .interp_path = "/libexec/ld-elf.so.1", .sysvec = &elf64_freebsd_sysvec, .interp_newpath = NULL, .brand_note = &elf64_freebsd_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info); -static Elf64_Brandinfo freebsd_brand_oinfo = { - .brand = ELFOSABI_FREEBSD, - .machine = EM_AARCH64, - .compat_3_brand = "FreeBSD", - .emul_path = NULL, - .interp_path = "/usr/libexec/ld-elf.so.1", - .sysvec = &elf64_freebsd_sysvec, - .interp_newpath = NULL, - .brand_note = &elf64_freebsd_brandnote, - .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE -}; - -SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, - (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo); - void elf64_dump_thread(struct thread *td __unused, void *dst __unused, size_t *off __unused) { } bool elf_is_ifunc_reloc(Elf_Size r_info __unused) { return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE); } static int elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, int local, elf_lookup_fn lookup) { Elf_Addr *where, addr, addend, val; Elf_Word rtype, symidx; const Elf_Rel *rel; const Elf_Rela *rela; int error; switch (type) { case ELF_RELOC_REL: rel = (const Elf_Rel *)data; where = (Elf_Addr *) (relocbase + rel->r_offset); addend = *where; rtype = ELF_R_TYPE(rel->r_info); symidx = ELF_R_SYM(rel->r_info); break; case ELF_RELOC_RELA: rela = (const Elf_Rela *)data; where = (Elf_Addr *) (relocbase + rela->r_offset); addend = rela->r_addend; rtype = ELF_R_TYPE(rela->r_info); symidx = ELF_R_SYM(rela->r_info); break; default: panic("unknown reloc type %d\n", type); } if (local) { if (rtype == R_AARCH64_RELATIVE) *where = elf_relocaddr(lf, relocbase + addend); return (0); } switch (rtype) { case R_AARCH64_NONE: case R_AARCH64_RELATIVE: break; case R_AARCH64_ABS64: case R_AARCH64_GLOB_DAT: case R_AARCH64_JUMP_SLOT: error = lookup(lf, symidx, 1, &addr); if (error != 0) return (-1); *where = addr + addend; break; case R_AARCH64_IRELATIVE: addr = relocbase + addend; val = ((Elf64_Addr (*)(void))addr)(); if (*where != val) *where = val; break; default: printf("kldload: unexpected relocation type %d\n", rtype); return (-1); } return (0); } int elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); } /* Process one elf relocation with addend. */ int elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); } int elf_cpu_load_file(linker_file_t lf) { if (lf->id != 1) cpu_icache_sync_range((vm_offset_t)lf->address, lf->size); return (0); } int elf_cpu_unload_file(linker_file_t lf __unused) { return (0); } Index: stable/12/sys/kern/imgact_elf.c =================================================================== --- stable/12/sys/kern/imgact_elf.c (revision 354259) +++ stable/12/sys/kern/imgact_elf.c (revision 354260) @@ -1,2769 +1,2770 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2017 Dell EMC * Copyright (c) 2000-2001, 2003 David O'Brien * Copyright (c) 1995-1996 Søren Schmidt * Copyright (c) 1996 Peter Wemm * 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_capsicum.h" #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 #include #define ELF_NOTE_ROUNDSIZE 4 #define OLD_EI_BRAND 8 static int __elfN(check_header)(const Elf_Ehdr *hdr); static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, const char *interp, int32_t *osrel, uint32_t *fctl0); static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, u_long *entry); static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot); static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel); static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); static boolean_t __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, int32_t *osrel, uint32_t *fctl0); static vm_prot_t __elfN(trans_prot)(Elf_Word); static Elf_Word __elfN(untrans_prot)(vm_prot_t); SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, ""); #define CORE_BUF_SIZE (16 * 1024) int __elfN(fallback_brand) = -1; SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); static int elf_legacy_coredump = 0; SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, &elf_legacy_coredump, 0, "include all and only RW pages in core dumps"); int __elfN(nxstack) = #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ - (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) + (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) || \ + defined(__riscv) 1; #else 0; #endif SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); #if __ELF_WORD_SIZE == 32 #if defined(__amd64__) int i386_read_exec = 0; SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, "enable execution from readable segments"); #endif #endif static u_long __elfN(pie_base) = ET_DYN_LOAD_ADDR; static int sysctl_pie_base(SYSCTL_HANDLER_ARGS) { u_long val; int error; val = __elfN(pie_base); error = sysctl_handle_long(oidp, &val, 0, req); if (error != 0 || req->newptr == NULL) return (error); if ((val & PAGE_MASK) != 0) return (EINVAL); __elfN(pie_base) = val; return (0); } SYSCTL_PROC(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base, CTLTYPE_ULONG | CTLFLAG_MPSAFE | CTLFLAG_RW, NULL, 0, sysctl_pie_base, "LU", "PIE load base without randomization"); SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, CTLFLAG_RW, 0, ""); #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr) static int __elfN(aslr_enabled) = 0; SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN, &__elfN(aslr_enabled), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable address map randomization"); static int __elfN(pie_aslr_enabled) = 0; SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN, &__elfN(pie_aslr_enabled), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable address map randomization for PIE binaries"); static int __elfN(aslr_honor_sbrk) = 1; SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW, &__elfN(aslr_honor_sbrk), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used"); static int __elfN(aslr_stack_gap) = 3; SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, stack_gap, CTLFLAG_RW, &__elfN(aslr_stack_gap), 0, __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": maximum percentage of main stack to waste on a random gap"); static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a)) static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; Elf_Brandnote __elfN(freebsd_brandnote) = { .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), .hdr.n_descsz = sizeof(int32_t), .hdr.n_type = NT_FREEBSD_ABI_TAG, .vendor = FREEBSD_ABI_VENDOR, .flags = BN_TRANSLATE_OSREL, .trans_osrel = __elfN(freebsd_trans_osrel) }; static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) { uintptr_t p; p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); *osrel = *(const int32_t *)(p); return (true); } static const char GNU_ABI_VENDOR[] = "GNU"; static int GNU_KFREEBSD_ABI_DESC = 3; Elf_Brandnote __elfN(kfreebsd_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 = kfreebsd_trans_osrel }; static bool kfreebsd_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, ELF_NOTE_ROUNDSIZE); desc = (const Elf32_Word *)p; if (desc[0] != GNU_KFREEBSD_ABI_DESC) return (false); /* * Debian GNU/kFreeBSD embed the earliest compatible kernel version * (__FreeBSD_version: Rxx) in the LSB way. */ *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; return (true); } int __elfN(insert_brand_entry)(Elf_Brandinfo *entry) { int i; for (i = 0; i < MAX_BRANDS; i++) { if (elf_brand_list[i] == NULL) { elf_brand_list[i] = entry; break; } } if (i == MAX_BRANDS) { printf("WARNING: %s: could not insert brandinfo entry: %p\n", __func__, entry); return (-1); } return (0); } int __elfN(remove_brand_entry)(Elf_Brandinfo *entry) { int i; for (i = 0; i < MAX_BRANDS; i++) { if (elf_brand_list[i] == entry) { elf_brand_list[i] = NULL; break; } } if (i == MAX_BRANDS) return (-1); return (0); } int __elfN(brand_inuse)(Elf_Brandinfo *entry) { struct proc *p; int rval = FALSE; sx_slock(&allproc_lock); FOREACH_PROC_IN_SYSTEM(p) { if (p->p_sysent == entry->sysvec) { rval = TRUE; break; } } sx_sunlock(&allproc_lock); return (rval); } static Elf_Brandinfo * __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, int32_t *osrel, uint32_t *fctl0) { const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; Elf_Brandinfo *bi, *bi_m; boolean_t ret; int i, interp_name_len; interp_name_len = interp != NULL ? strlen(interp) + 1 : 0; /* * We support four types of branding -- (1) the ELF EI_OSABI field * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string * branding w/in the ELF header, (3) path of the `interp_path' * field, and (4) the ".note.ABI-tag" ELF section. */ /* Look for an ".note.ABI-tag" ELF section */ bi_m = NULL; for (i = 0; i < MAX_BRANDS; i++) { bi = elf_brand_list[i]; if (bi == NULL) continue; if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) continue; if (hdr->e_machine == bi->machine && (bi->flags & (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { ret = __elfN(check_note)(imgp, bi->brand_note, osrel, fctl0); /* Give brand a chance to veto check_note's guess */ if (ret && bi->header_supported) ret = bi->header_supported(imgp); /* * If note checker claimed the binary, but the * interpreter path in the image does not * match default one for the brand, try to * search for other brands with the same * interpreter. Either there is better brand * with the right interpreter, or, failing * this, we return first brand which accepted * our note and, optionally, header. */ if (ret && bi_m == NULL && interp != NULL && (bi->interp_path == NULL || (strlen(bi->interp_path) + 1 != interp_name_len || strncmp(interp, bi->interp_path, interp_name_len) != 0))) { bi_m = bi; ret = 0; } if (ret) return (bi); } } if (bi_m != NULL) return (bi_m); /* If the executable has a brand, search for it in the brand list. */ for (i = 0; i < MAX_BRANDS; i++) { bi = elf_brand_list[i]; if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) continue; if (hdr->e_machine == bi->machine && (hdr->e_ident[EI_OSABI] == bi->brand || (bi->compat_3_brand != NULL && strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], bi->compat_3_brand) == 0))) { /* Looks good, but give brand a chance to veto */ if (bi->header_supported == NULL || bi->header_supported(imgp)) { /* * Again, prefer strictly matching * interpreter path. */ if (interp_name_len == 0 && bi->interp_path == NULL) return (bi); if (bi->interp_path != NULL && strlen(bi->interp_path) + 1 == interp_name_len && strncmp(interp, bi->interp_path, interp_name_len) == 0) return (bi); if (bi_m == NULL) bi_m = bi; } } } if (bi_m != NULL) return (bi_m); /* No known brand, see if the header is recognized by any brand */ for (i = 0; i < MAX_BRANDS; i++) { bi = elf_brand_list[i]; if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || bi->header_supported == NULL) continue; if (hdr->e_machine == bi->machine) { ret = bi->header_supported(imgp); if (ret) return (bi); } } /* Lacking a known brand, search for a recognized interpreter. */ if (interp != NULL) { for (i = 0; i < MAX_BRANDS; i++) { bi = elf_brand_list[i]; if (bi == NULL || (bi->flags & (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) != 0) continue; if (hdr->e_machine == bi->machine && bi->interp_path != NULL && /* ELF image p_filesz includes terminating zero */ strlen(bi->interp_path) + 1 == interp_name_len && strncmp(interp, bi->interp_path, interp_name_len) == 0 && (bi->header_supported == NULL || bi->header_supported(imgp))) return (bi); } } /* Lacking a recognized interpreter, try the default brand */ for (i = 0; i < MAX_BRANDS; i++) { bi = elf_brand_list[i]; if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) continue; if (hdr->e_machine == bi->machine && __elfN(fallback_brand) == bi->brand && (bi->header_supported == NULL || bi->header_supported(imgp))) return (bi); } return (NULL); } static int __elfN(check_header)(const Elf_Ehdr *hdr) { Elf_Brandinfo *bi; int i; if (!IS_ELF(*hdr) || hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || hdr->e_ident[EI_DATA] != ELF_TARG_DATA || hdr->e_ident[EI_VERSION] != EV_CURRENT || hdr->e_phentsize != sizeof(Elf_Phdr) || hdr->e_version != ELF_TARG_VER) return (ENOEXEC); /* * Make sure we have at least one brand for this machine. */ for (i = 0; i < MAX_BRANDS; i++) { bi = elf_brand_list[i]; if (bi != NULL && bi->machine == hdr->e_machine) break; } if (i == MAX_BRANDS) return (ENOEXEC); return (0); } static int __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot) { struct sf_buf *sf; int error; vm_offset_t off; /* * Create the page if it doesn't exist yet. Ignore errors. */ vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); /* * Find the page from the underlying object. */ if (object != NULL) { sf = vm_imgact_map_page(object, offset); if (sf == NULL) return (KERN_FAILURE); off = offset - trunc_page(offset); error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, end - start); vm_imgact_unmap_page(sf); if (error != 0) return (KERN_FAILURE); } return (KERN_SUCCESS); } static int __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) { struct sf_buf *sf; vm_offset_t off; vm_size_t sz; int error, locked, rv; if (start != trunc_page(start)) { rv = __elfN(map_partial)(map, object, offset, start, round_page(start), prot); if (rv != KERN_SUCCESS) return (rv); offset += round_page(start) - start; start = round_page(start); } if (end != round_page(end)) { rv = __elfN(map_partial)(map, object, offset + trunc_page(end) - start, trunc_page(end), end, prot); if (rv != KERN_SUCCESS) return (rv); end = trunc_page(end); } if (start >= end) return (KERN_SUCCESS); if ((offset & PAGE_MASK) != 0) { /* * The mapping is not page aligned. This means that we have * to copy the data. */ rv = vm_map_fixed(map, NULL, 0, start, end - start, prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); if (rv != KERN_SUCCESS) return (rv); if (object == NULL) return (KERN_SUCCESS); for (; start < end; start += sz) { sf = vm_imgact_map_page(object, offset); if (sf == NULL) return (KERN_FAILURE); off = offset - trunc_page(offset); sz = end - start; if (sz > PAGE_SIZE - off) sz = PAGE_SIZE - off; error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, sz); vm_imgact_unmap_page(sf); if (error != 0) return (KERN_FAILURE); offset += sz; } } else { vm_object_reference(object); rv = vm_map_fixed(map, object, offset, start, end - start, prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL | (object != NULL ? MAP_VN_EXEC : 0)); if (rv != KERN_SUCCESS) { locked = VOP_ISLOCKED(imgp->vp); VOP_UNLOCK(imgp->vp, 0); vm_object_deallocate(object); vn_lock(imgp->vp, locked | LK_RETRY); return (rv); } else if (object != NULL) { MPASS(imgp->vp->v_object == object); VOP_SET_TEXT_CHECKED(imgp->vp); } } return (KERN_SUCCESS); } static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) { struct sf_buf *sf; size_t map_len; vm_map_t map; vm_object_t object; vm_offset_t off, map_addr; int error, rv, cow; size_t copy_len; vm_ooffset_t file_addr; /* * It's necessary to fail if the filsz + offset taken from the * header is greater than the actual file pager object's size. * If we were to allow this, then the vm_map_find() below would * walk right off the end of the file object and into the ether. * * While I'm here, might as well check for something else that * is invalid: filsz cannot be greater than memsz. */ if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || filsz > memsz) { uprintf("elf_load_section: truncated ELF file\n"); return (ENOEXEC); } object = imgp->object; map = &imgp->proc->p_vmspace->vm_map; map_addr = trunc_page((vm_offset_t)vmaddr); file_addr = trunc_page(offset); /* * We have two choices. We can either clear the data in the last page * of an oversized mapping, or we can start the anon mapping a page * early and copy the initialized data into that first page. We * choose the second. */ if (filsz == 0) map_len = 0; else if (memsz > filsz) map_len = trunc_page(offset + filsz) - file_addr; else map_len = round_page(offset + filsz) - file_addr; if (map_len != 0) { /* cow flags: don't dump readonly sections in core */ cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); rv = __elfN(map_insert)(imgp, map, object, file_addr, map_addr, map_addr + map_len, prot, cow); if (rv != KERN_SUCCESS) return (EINVAL); /* we can stop now if we've covered it all */ if (memsz == filsz) return (0); } /* * We have to get the remaining bit of the file into the first part * of the oversized map segment. This is normally because the .data * segment in the file is extended to provide bss. It's a neat idea * to try and save a page, but it's a pain in the behind to implement. */ copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset + filsz); map_addr = trunc_page((vm_offset_t)vmaddr + filsz); map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; /* This had damn well better be true! */ if (map_len != 0) { rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, map_addr + map_len, prot, 0); if (rv != KERN_SUCCESS) return (EINVAL); } if (copy_len != 0) { sf = vm_imgact_map_page(object, offset + filsz); if (sf == NULL) return (EIO); /* send the page fragment to user space */ off = trunc_page(offset + filsz) - trunc_page(offset + filsz); error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)map_addr, copy_len); vm_imgact_unmap_page(sf); if (error != 0) return (error); } /* * Remove write access to the page if it was only granted by map_insert * to allow copyout. */ if ((prot & VM_PROT_WRITE) == 0) vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + map_len), prot, FALSE); return (0); } static int __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr, const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp) { vm_prot_t prot; u_long base_addr; bool first; int error, i; ASSERT_VOP_LOCKED(imgp->vp, __func__); base_addr = 0; first = true; for (i = 0; i < hdr->e_phnum; i++) { if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0) continue; /* Loadable segment */ prot = __elfN(trans_prot)(phdr[i].p_flags); error = __elfN(load_section)(imgp, phdr[i].p_offset, (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, phdr[i].p_memsz, phdr[i].p_filesz, prot); if (error != 0) return (error); /* * Establish the base address if this is the first segment. */ if (first) { base_addr = trunc_page(phdr[i].p_vaddr + rbase); first = false; } } if (base_addrp != NULL) *base_addrp = base_addr; return (0); } /* * Load the file "file" into memory. It may be either a shared object * or an executable. * * The "addr" reference parameter is in/out. On entry, it specifies * the address where a shared object should be loaded. If the file is * an executable, this value is ignored. On exit, "addr" specifies * where the file was actually loaded. * * The "entry" reference parameter is out only. On exit, it specifies * the entry point for the loaded file. */ static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, u_long *entry) { struct { struct nameidata nd; struct vattr attr; struct image_params image_params; } *tempdata; const Elf_Ehdr *hdr = NULL; const Elf_Phdr *phdr = NULL; struct nameidata *nd; struct vattr *attr; struct image_params *imgp; u_long rbase; u_long base_addr = 0; int error; #ifdef CAPABILITY_MODE /* * XXXJA: This check can go away once we are sufficiently confident * that the checks in namei() are correct. */ if (IN_CAPABILITY_MODE(curthread)) return (ECAPMODE); #endif tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK | M_ZERO); nd = &tempdata->nd; attr = &tempdata->attr; imgp = &tempdata->image_params; /* * Initialize part of the common data */ imgp->proc = p; imgp->attr = attr; NDINIT(nd, LOOKUP, ISOPEN | FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, file, curthread); if ((error = namei(nd)) != 0) { nd->ni_vp = NULL; goto fail; } NDFREE(nd, NDF_ONLY_PNBUF); imgp->vp = nd->ni_vp; /* * Check permissions, modes, uid, etc on the file, and "open" it. */ error = exec_check_permissions(imgp); if (error) goto fail; error = exec_map_first_page(imgp); if (error) goto fail; imgp->object = nd->ni_vp->v_object; hdr = (const Elf_Ehdr *)imgp->image_header; if ((error = __elfN(check_header)(hdr)) != 0) goto fail; if (hdr->e_type == ET_DYN) rbase = *addr; else if (hdr->e_type == ET_EXEC) rbase = 0; else { error = ENOEXEC; goto fail; } /* Only support headers that fit within first page for now */ if ((hdr->e_phoff > PAGE_SIZE) || (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { error = ENOEXEC; goto fail; } phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); if (!aligned(phdr, Elf_Addr)) { error = ENOEXEC; goto fail; } error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr); if (error != 0) goto fail; *addr = base_addr; *entry = (unsigned long)hdr->e_entry + rbase; fail: if (imgp->firstpage) exec_unmap_first_page(imgp); if (nd->ni_vp) { if (imgp->textset) VOP_UNSET_TEXT_CHECKED(nd->ni_vp); vput(nd->ni_vp); } free(tempdata, M_TEMP); return (error); } static u_long __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv, u_int align) { u_long rbase, res; MPASS(vm_map_min(map) <= minv); MPASS(maxv <= vm_map_max(map)); MPASS(minv < maxv); MPASS(minv + align < maxv); arc4rand(&rbase, sizeof(rbase), 0); res = roundup(minv, (u_long)align) + rbase % (maxv - minv); res &= ~((u_long)align - 1); if (res >= maxv) res -= align; KASSERT(res >= minv, ("res %#lx < minv %#lx, maxv %#lx rbase %#lx", res, minv, maxv, rbase)); KASSERT(res < maxv, ("res %#lx > maxv %#lx, minv %#lx rbase %#lx", res, maxv, minv, rbase)); return (res); } static int __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr, const Elf_Phdr *phdr, u_long et_dyn_addr) { struct vmspace *vmspace; const char *err_str; u_long text_size, data_size, total_size, text_addr, data_addr; u_long seg_size, seg_addr; int i; err_str = NULL; text_size = data_size = total_size = text_addr = data_addr = 0; for (i = 0; i < hdr->e_phnum; i++) { if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0) continue; seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); seg_size = round_page(phdr[i].p_memsz + phdr[i].p_vaddr + et_dyn_addr - seg_addr); /* * Make the largest executable segment the official * text segment and all others data. * * Note that obreak() assumes that data_addr + data_size == end * of data load area, and the ELF file format expects segments * to be sorted by address. If multiple data segments exist, * the last one will be used. */ if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) { text_size = seg_size; text_addr = seg_addr; } else { data_size = seg_size; data_addr = seg_addr; } total_size += seg_size; } if (data_addr == 0 && data_size == 0) { data_addr = text_addr; data_size = text_size; } /* * Check limits. It should be safe to check the * limits after loading the segments since we do * not actually fault in all the segments pages. */ PROC_LOCK(imgp->proc); if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) err_str = "Data segment size exceeds process limit"; else if (text_size > maxtsiz) err_str = "Text segment size exceeds system limit"; else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) err_str = "Total segment size exceeds process limit"; else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) err_str = "Data segment size exceeds resource limit"; else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) err_str = "Total segment size exceeds resource limit"; PROC_UNLOCK(imgp->proc); if (err_str != NULL) { uprintf("%s\n", err_str); return (ENOMEM); } vmspace = imgp->proc->p_vmspace; vmspace->vm_tsize = text_size >> PAGE_SHIFT; vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; vmspace->vm_dsize = data_size >> PAGE_SHIFT; vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; return (0); } static int __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr, char **interpp, bool *free_interpp) { struct thread *td; char *interp; int error, interp_name_len; KASSERT(phdr->p_type == PT_INTERP, ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type)); ASSERT_VOP_LOCKED(imgp->vp, __func__); td = curthread; /* Path to interpreter */ if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) { uprintf("Invalid PT_INTERP\n"); return (ENOEXEC); } interp_name_len = phdr->p_filesz; if (phdr->p_offset > PAGE_SIZE || interp_name_len > PAGE_SIZE - phdr->p_offset) { /* * The vnode lock might be needed by the pagedaemon to * clean pages owned by the vnode. Do not allow sleep * waiting for memory with the vnode locked, instead * try non-sleepable allocation first, and if it * fails, go to the slow path were we drop the lock * and do M_WAITOK. A text reference prevents * modifications to the vnode content. */ interp = malloc(interp_name_len + 1, M_TEMP, M_NOWAIT); if (interp == NULL) { VOP_UNLOCK(imgp->vp, 0); interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK); vn_lock(imgp->vp, LK_SHARED | LK_RETRY); } error = vn_rdwr(UIO_READ, imgp->vp, interp, interp_name_len, phdr->p_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, NULL, td); if (error != 0) { free(interp, M_TEMP); uprintf("i/o error PT_INTERP %d\n", error); return (error); } interp[interp_name_len] = '\0'; *interpp = interp; *free_interpp = true; return (0); } interp = __DECONST(char *, imgp->image_header) + phdr->p_offset; if (interp[interp_name_len - 1] != '\0') { uprintf("Invalid PT_INTERP\n"); return (ENOEXEC); } *interpp = interp; *free_interpp = false; return (0); } static int __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info, const char *interp, u_long *addr, u_long *entry) { char *path; int error; if (brand_info->emul_path != NULL && brand_info->emul_path[0] != '\0') { path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); snprintf(path, MAXPATHLEN, "%s%s", brand_info->emul_path, interp); error = __elfN(load_file)(imgp->proc, path, addr, entry); free(path, M_TEMP); if (error == 0) return (0); } if (brand_info->interp_newpath != NULL && (brand_info->interp_path == NULL || strcmp(interp, brand_info->interp_path) == 0)) { error = __elfN(load_file)(imgp->proc, brand_info->interp_newpath, addr, entry); if (error == 0) return (0); } error = __elfN(load_file)(imgp->proc, interp, addr, entry); if (error == 0) return (0); uprintf("ELF interpreter %s not found, error %d\n", interp, error); return (error); } /* * Impossible et_dyn_addr initial value indicating that the real base * must be calculated later with some randomization applied. */ #define ET_DYN_ADDR_RAND 1 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) { struct thread *td; const Elf_Ehdr *hdr; const Elf_Phdr *phdr; Elf_Auxargs *elf_auxargs; struct vmspace *vmspace; vm_map_t map; char *interp; Elf_Brandinfo *brand_info; struct sysentvec *sv; u_long addr, baddr, et_dyn_addr, entry, proghdr; u_long maxalign, mapsz, maxv, maxv1; uint32_t fctl0; int32_t osrel; bool free_interp; int error, i, n; hdr = (const Elf_Ehdr *)imgp->image_header; /* * Do we have a valid ELF header ? * * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later * if particular brand doesn't support it. */ if (__elfN(check_header)(hdr) != 0 || (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) return (-1); /* * From here on down, we return an errno, not -1, as we've * detected an ELF file. */ if ((hdr->e_phoff > PAGE_SIZE) || (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { /* Only support headers in first page for now */ uprintf("Program headers not in the first page\n"); return (ENOEXEC); } phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); if (!aligned(phdr, Elf_Addr)) { uprintf("Unaligned program headers\n"); return (ENOEXEC); } n = error = 0; baddr = 0; osrel = 0; fctl0 = 0; entry = proghdr = 0; interp = NULL; free_interp = false; td = curthread; maxalign = PAGE_SIZE; mapsz = 0; for (i = 0; i < hdr->e_phnum; i++) { switch (phdr[i].p_type) { case PT_LOAD: if (n == 0) baddr = phdr[i].p_vaddr; if (phdr[i].p_align > maxalign) maxalign = phdr[i].p_align; mapsz += phdr[i].p_memsz; n++; /* * If this segment contains the program headers, * remember their virtual address for the AT_PHDR * aux entry. Static binaries don't usually include * a PT_PHDR entry. */ if (phdr[i].p_offset == 0 && hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize <= phdr[i].p_filesz) proghdr = phdr[i].p_vaddr + hdr->e_phoff; break; case PT_INTERP: /* Path to interpreter */ if (interp != NULL) { uprintf("Multiple PT_INTERP headers\n"); error = ENOEXEC; goto ret; } error = __elfN(get_interp)(imgp, &phdr[i], &interp, &free_interp); if (error != 0) goto ret; break; case PT_GNU_STACK: if (__elfN(nxstack)) imgp->stack_prot = __elfN(trans_prot)(phdr[i].p_flags); imgp->stack_sz = phdr[i].p_memsz; break; case PT_PHDR: /* Program header table info */ proghdr = phdr[i].p_vaddr; break; } } brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0); if (brand_info == NULL) { uprintf("ELF binary type \"%u\" not known.\n", hdr->e_ident[EI_OSABI]); error = ENOEXEC; goto ret; } sv = brand_info->sysvec; et_dyn_addr = 0; if (hdr->e_type == ET_DYN) { if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { uprintf("Cannot execute shared object\n"); error = ENOEXEC; goto ret; } /* * Honour the base load address from the dso if it is * non-zero for some reason. */ if (baddr == 0) { if ((sv->sv_flags & SV_ASLR) == 0 || (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) et_dyn_addr = __elfN(pie_base); else if ((__elfN(pie_aslr_enabled) && (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) || (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0) et_dyn_addr = ET_DYN_ADDR_RAND; else et_dyn_addr = __elfN(pie_base); } } /* * Avoid a possible deadlock if the current address space is destroyed * and that address space maps the locked vnode. In the common case, * the locked vnode's v_usecount is decremented but remains greater * than zero. Consequently, the vnode lock is not needed by vrele(). * However, in cases where the vnode lock is external, such as nullfs, * v_usecount may become zero. * * The VV_TEXT flag prevents modifications to the executable while * the vnode is unlocked. */ VOP_UNLOCK(imgp->vp, 0); /* * Decide whether to enable randomization of user mappings. * First, reset user preferences for the setid binaries. * Then, account for the support of the randomization by the * ABI, by user preferences, and make special treatment for * PIE binaries. */ if (imgp->credential_setid) { PROC_LOCK(imgp->proc); imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE); PROC_UNLOCK(imgp->proc); } if ((sv->sv_flags & SV_ASLR) == 0 || (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 || (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) { KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND, ("et_dyn_addr == RAND and !ASLR")); } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 || (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) || et_dyn_addr == ET_DYN_ADDR_RAND) { imgp->map_flags |= MAP_ASLR; /* * If user does not care about sbrk, utilize the bss * grow region for mappings as well. We can select * the base for the image anywere and still not suffer * from the fragmentation. */ if (!__elfN(aslr_honor_sbrk) || (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0) imgp->map_flags |= MAP_ASLR_IGNSTART; } error = exec_new_vmspace(imgp, sv); vmspace = imgp->proc->p_vmspace; map = &vmspace->vm_map; imgp->proc->p_sysent = sv; maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK); if (et_dyn_addr == ET_DYN_ADDR_RAND) { KASSERT((map->flags & MAP_ASLR) != 0, ("ET_DYN_ADDR_RAND but !MAP_ASLR")); et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map, vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA), /* reserve half of the address space to interpreter */ maxv / 2, 1UL << flsl(maxalign)); } vn_lock(imgp->vp, LK_SHARED | LK_RETRY); if (error != 0) goto ret; error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL); if (error != 0) goto ret; error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr); if (error != 0) goto ret; entry = (u_long)hdr->e_entry + et_dyn_addr; /* * We load the dynamic linker where a userland call * to mmap(0, ...) would put it. The rationale behind this * calculation is that it leaves room for the heap to grow to * its maximum allowed size. */ addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, RLIMIT_DATA)); if ((map->flags & MAP_ASLR) != 0) { maxv1 = maxv / 2 + addr / 2; MPASS(maxv1 >= addr); /* No overflow */ map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1, MAXPAGESIZES > 1 ? pagesizes[1] : pagesizes[0]); } else { map->anon_loc = addr; } imgp->entry_addr = entry; if (interp != NULL) { VOP_UNLOCK(imgp->vp, 0); if ((map->flags & MAP_ASLR) != 0) { /* Assume that interpeter fits into 1/4 of AS */ maxv1 = maxv / 2 + addr / 2; MPASS(maxv1 >= addr); /* No overflow */ addr = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1, PAGE_SIZE); } error = __elfN(load_interp)(imgp, brand_info, interp, &addr, &imgp->entry_addr); vn_lock(imgp->vp, LK_SHARED | LK_RETRY); if (error != 0) goto ret; } else addr = et_dyn_addr; /* * Construct auxargs table (used by the fixup routine) */ elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_NOWAIT); if (elf_auxargs == NULL) { VOP_UNLOCK(imgp->vp, 0); elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); vn_lock(imgp->vp, LK_SHARED | LK_RETRY); } elf_auxargs->execfd = -1; elf_auxargs->phdr = proghdr + et_dyn_addr; elf_auxargs->phent = hdr->e_phentsize; elf_auxargs->phnum = hdr->e_phnum; elf_auxargs->pagesz = PAGE_SIZE; elf_auxargs->base = addr; elf_auxargs->flags = 0; elf_auxargs->entry = entry; elf_auxargs->hdr_eflags = hdr->e_flags; imgp->auxargs = elf_auxargs; imgp->interpreted = 0; imgp->reloc_base = addr; imgp->proc->p_osrel = osrel; imgp->proc->p_fctl0 = fctl0; imgp->proc->p_elf_machine = hdr->e_machine; imgp->proc->p_elf_flags = hdr->e_flags; ret: if (free_interp) free(interp, M_TEMP); return (error); } #define suword __CONCAT(suword, __ELF_WORD_SIZE) int __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) { Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; Elf_Auxinfo *argarray, *pos; Elf_Addr *base, *auxbase; int error; base = (Elf_Addr *)*stack_base; auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1; argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, M_WAITOK | M_ZERO); if (args->execfd != -1) AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 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, AT_EHDRFLAGS, args->hdr_eflags); if (imgp->execpathp != 0) AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); AUXARGS_ENTRY(pos, AT_OSRELDATE, imgp->proc->p_ucred->cr_prison->pr_osreldate); if (imgp->canary != 0) { AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); } AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); if (imgp->pagesizes != 0) { AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); } if (imgp->sysent->sv_timekeep_base != 0) { AUXARGS_ENTRY(pos, AT_TIMEKEEP, imgp->sysent->sv_timekeep_base); } AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : imgp->sysent->sv_stackprot); if (imgp->sysent->sv_hwcap != NULL) AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); if (imgp->sysent->sv_hwcap2 != NULL) AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); AUXARGS_ENTRY(pos, AT_NULL, 0); free(imgp->auxargs, M_TEMP); imgp->auxargs = NULL; KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs")); error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT); free(argarray, M_TEMP); if (error != 0) return (error); base--; if (suword(base, imgp->args->argc) == -1) return (EFAULT); *stack_base = (register_t *)base; return (0); } /* * Code for generating ELF core dumps. */ typedef void (*segment_callback)(vm_map_entry_t, void *); /* Closure for cb_put_phdr(). */ struct phdr_closure { Elf_Phdr *phdr; /* Program header to fill in */ Elf_Off offset; /* Offset of segment in core file */ }; /* Closure for cb_size_segment(). */ struct sseg_closure { int count; /* Count of writable segments. */ size_t size; /* Total size of all writable segments. */ }; typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); struct note_info { int type; /* Note type. */ outfunc_t outfunc; /* Output function. */ void *outarg; /* Argument for the output function. */ size_t outsize; /* Output size. */ TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ }; TAILQ_HEAD(note_info_list, note_info); /* Coredump output parameters. */ struct coredump_params { off_t offset; struct ucred *active_cred; struct ucred *file_cred; struct thread *td; struct vnode *vp; struct compressor *comp; }; extern int compress_user_cores; extern int compress_user_cores_level; static void cb_put_phdr(vm_map_entry_t, void *); static void cb_size_segment(vm_map_entry_t, void *); static int core_write(struct coredump_params *, const void *, size_t, off_t, enum uio_seg); static void each_dumpable_segment(struct thread *, segment_callback, void *); static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, struct note_info_list *, size_t); static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, size_t *); static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); static void __elfN(putnote)(struct note_info *, struct sbuf *); static size_t register_note(struct note_info_list *, int, outfunc_t, void *); static int sbuf_drain_core_output(void *, const char *, int); static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); static void note_procstat_files(void *, struct sbuf *, size_t *); static void note_procstat_groups(void *, struct sbuf *, size_t *); static void note_procstat_osrel(void *, struct sbuf *, size_t *); static void note_procstat_rlimit(void *, struct sbuf *, size_t *); static void note_procstat_umask(void *, struct sbuf *, size_t *); static void note_procstat_vmmap(void *, struct sbuf *, size_t *); /* * Write out a core segment to the compression stream. */ static int compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) { u_int chunk_len; int error; while (len > 0) { chunk_len = MIN(len, CORE_BUF_SIZE); /* * We can get EFAULT error here. * In that case zero out the current chunk of the segment. */ error = copyin(base, buf, chunk_len); if (error != 0) bzero(buf, chunk_len); error = compressor_write(p->comp, buf, chunk_len); if (error != 0) break; base += chunk_len; len -= chunk_len; } return (error); } static int core_compressed_write(void *base, size_t len, off_t offset, void *arg) { return (core_write((struct coredump_params *)arg, base, len, offset, UIO_SYSSPACE)); } static int core_write(struct coredump_params *p, const void *base, size_t len, off_t offset, enum uio_seg seg) { return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, p->active_cred, p->file_cred, NULL, p->td)); } static int core_output(void *base, size_t len, off_t offset, struct coredump_params *p, void *tmpbuf) { int error; if (p->comp != NULL) return (compress_chunk(p, base, tmpbuf, len)); /* * EFAULT is a non-fatal error that we can get, for example, * if the segment is backed by a file but extends beyond its * end. */ error = core_write(p, base, len, offset, UIO_USERSPACE); if (error == EFAULT) { log(LOG_WARNING, "Failed to fully fault in a core file segment " "at VA %p with size 0x%zx to be written at offset 0x%jx " "for process %s\n", base, len, offset, curproc->p_comm); /* * Write a "real" zero byte at the end of the target region * in the case this is the last segment. * The intermediate space will be implicitly zero-filled. */ error = core_write(p, zero_region, 1, offset + len - 1, UIO_SYSSPACE); } return (error); } /* * Drain into a core file. */ static int sbuf_drain_core_output(void *arg, const char *data, int len) { struct coredump_params *p; int error, locked; p = (struct coredump_params *)arg; /* * Some kern_proc out routines that print to this sbuf may * call us with the process lock held. Draining with the * non-sleepable lock held is unsafe. The lock is needed for * those routines when dumping a live process. In our case we * can safely release the lock before draining and acquire * again after. */ locked = PROC_LOCKED(p->td->td_proc); if (locked) PROC_UNLOCK(p->td->td_proc); if (p->comp != NULL) error = compressor_write(p->comp, __DECONST(char *, data), len); else error = core_write(p, __DECONST(void *, data), len, p->offset, UIO_SYSSPACE); if (locked) PROC_LOCK(p->td->td_proc); if (error != 0) return (-error); p->offset += len; return (len); } int __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) { struct ucred *cred = td->td_ucred; int error = 0; struct sseg_closure seginfo; struct note_info_list notelst; struct coredump_params params; struct note_info *ninfo; void *hdr, *tmpbuf; size_t hdrsize, notesz, coresize; hdr = NULL; tmpbuf = NULL; TAILQ_INIT(¬elst); /* Size the program segments. */ seginfo.count = 0; seginfo.size = 0; each_dumpable_segment(td, cb_size_segment, &seginfo); /* * Collect info about the core file header area. */ hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); if (seginfo.count + 1 >= PN_XNUM) hdrsize += sizeof(Elf_Shdr); __elfN(prepare_notes)(td, ¬elst, ¬esz); coresize = round_page(hdrsize + notesz) + seginfo.size; /* Set up core dump parameters. */ params.offset = 0; params.active_cred = cred; params.file_cred = NOCRED; params.td = td; params.vp = vp; params.comp = NULL; #ifdef RACCT if (racct_enable) { PROC_LOCK(td->td_proc); error = racct_add(td->td_proc, RACCT_CORE, coresize); PROC_UNLOCK(td->td_proc); if (error != 0) { error = EFAULT; goto done; } } #endif if (coresize >= limit) { error = EFAULT; goto done; } /* Create a compression stream if necessary. */ if (compress_user_cores != 0) { params.comp = compressor_init(core_compressed_write, compress_user_cores, CORE_BUF_SIZE, compress_user_cores_level, ¶ms); if (params.comp == NULL) { error = EFAULT; goto done; } tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); } /* * Allocate memory for building the header, fill it up, * and write it out following the notes. */ hdr = malloc(hdrsize, M_TEMP, M_WAITOK); error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, notesz); /* Write the contents of all of the writable segments. */ if (error == 0) { Elf_Phdr *php; off_t offset; int i; php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; offset = round_page(hdrsize + notesz); for (i = 0; i < seginfo.count; i++) { error = core_output((caddr_t)(uintptr_t)php->p_vaddr, php->p_filesz, offset, ¶ms, tmpbuf); if (error != 0) break; offset += php->p_filesz; php++; } if (error == 0 && params.comp != NULL) error = compressor_flush(params.comp); } if (error) { log(LOG_WARNING, "Failed to write core file for process %s (error %d)\n", curproc->p_comm, error); } done: free(tmpbuf, M_TEMP); if (params.comp != NULL) compressor_fini(params.comp); while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { TAILQ_REMOVE(¬elst, ninfo, link); free(ninfo, M_TEMP); } if (hdr != NULL) free(hdr, M_TEMP); return (error); } /* * A callback for each_dumpable_segment() to write out the segment's * program header entry. */ static void cb_put_phdr(vm_map_entry_t entry, void *closure) { struct phdr_closure *phc = (struct phdr_closure *)closure; Elf_Phdr *phdr = phc->phdr; phc->offset = round_page(phc->offset); phdr->p_type = PT_LOAD; phdr->p_offset = phc->offset; phdr->p_vaddr = entry->start; phdr->p_paddr = 0; phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; phdr->p_align = PAGE_SIZE; phdr->p_flags = __elfN(untrans_prot)(entry->protection); phc->offset += phdr->p_filesz; phc->phdr++; } /* * A callback for each_dumpable_segment() to gather information about * the number of segments and their total size. */ static void cb_size_segment(vm_map_entry_t entry, void *closure) { struct sseg_closure *ssc = (struct sseg_closure *)closure; ssc->count++; ssc->size += entry->end - entry->start; } /* * For each writable segment in the process's memory map, call the given * function with a pointer to the map entry and some arbitrary * caller-supplied data. */ static void each_dumpable_segment(struct thread *td, segment_callback func, void *closure) { struct proc *p = td->td_proc; vm_map_t map = &p->p_vmspace->vm_map; vm_map_entry_t entry; vm_object_t backing_object, object; boolean_t ignore_entry; vm_map_lock_read(map); for (entry = map->header.next; entry != &map->header; entry = entry->next) { /* * Don't dump inaccessible mappings, deal with legacy * coredump mode. * * Note that read-only segments related to the elf binary * are marked MAP_ENTRY_NOCOREDUMP now so we no longer * need to arbitrarily ignore such segments. */ if (elf_legacy_coredump) { if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) continue; } else { if ((entry->protection & VM_PROT_ALL) == 0) continue; } /* * Dont include memory segment in the coredump if * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in * madvise(2). Do not dump submaps (i.e. parts of the * kernel map). */ if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) continue; if ((object = entry->object.vm_object) == NULL) continue; /* Ignore memory-mapped devices and such things. */ VM_OBJECT_RLOCK(object); while ((backing_object = object->backing_object) != NULL) { VM_OBJECT_RLOCK(backing_object); VM_OBJECT_RUNLOCK(object); object = backing_object; } ignore_entry = object->type != OBJT_DEFAULT && object->type != OBJT_SWAP && object->type != OBJT_VNODE && object->type != OBJT_PHYS; VM_OBJECT_RUNLOCK(object); if (ignore_entry) continue; (*func)(entry, closure); } vm_map_unlock_read(map); } /* * Write the core file header to the file, including padding up to * the page boundary. */ static int __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst, size_t notesz) { struct note_info *ninfo; struct sbuf *sb; int error; /* Fill in the header. */ bzero(hdr, hdrsize); __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); sbuf_set_drain(sb, sbuf_drain_core_output, p); sbuf_start_section(sb, NULL); sbuf_bcat(sb, hdr, hdrsize); TAILQ_FOREACH(ninfo, notelst, link) __elfN(putnote)(ninfo, sb); /* Align up to a page boundary for the program segments. */ sbuf_end_section(sb, -1, PAGE_SIZE, 0); error = sbuf_finish(sb); sbuf_delete(sb); return (error); } static void __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, size_t *sizep) { struct proc *p; struct thread *thr; size_t size; p = td->td_proc; size = 0; size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); /* * To have the debugger select the right thread (LWP) as the initial * thread, we dump the state of the thread passed to us in td first. * This is the thread that causes the core dump and thus likely to * be the right thread one wants to have selected in the debugger. */ thr = td; while (thr != NULL) { size += register_note(list, NT_PRSTATUS, __elfN(note_prstatus), thr); size += register_note(list, NT_FPREGSET, __elfN(note_fpregset), thr); size += register_note(list, NT_THRMISC, __elfN(note_thrmisc), thr); size += register_note(list, NT_PTLWPINFO, __elfN(note_ptlwpinfo), thr); size += register_note(list, -1, __elfN(note_threadmd), thr); thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : TAILQ_NEXT(thr, td_plist); if (thr == td) thr = TAILQ_NEXT(thr, td_plist); } size += register_note(list, NT_PROCSTAT_PROC, __elfN(note_procstat_proc), p); size += register_note(list, NT_PROCSTAT_FILES, note_procstat_files, p); size += register_note(list, NT_PROCSTAT_VMMAP, note_procstat_vmmap, p); size += register_note(list, NT_PROCSTAT_GROUPS, note_procstat_groups, p); size += register_note(list, NT_PROCSTAT_UMASK, note_procstat_umask, p); size += register_note(list, NT_PROCSTAT_RLIMIT, note_procstat_rlimit, p); size += register_note(list, NT_PROCSTAT_OSREL, note_procstat_osrel, p); size += register_note(list, NT_PROCSTAT_PSSTRINGS, __elfN(note_procstat_psstrings), p); size += register_note(list, NT_PROCSTAT_AUXV, __elfN(note_procstat_auxv), p); *sizep = size; } static void __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, size_t notesz) { Elf_Ehdr *ehdr; Elf_Phdr *phdr; Elf_Shdr *shdr; struct phdr_closure phc; ehdr = (Elf_Ehdr *)hdr; ehdr->e_ident[EI_MAG0] = ELFMAG0; ehdr->e_ident[EI_MAG1] = ELFMAG1; ehdr->e_ident[EI_MAG2] = ELFMAG2; ehdr->e_ident[EI_MAG3] = ELFMAG3; ehdr->e_ident[EI_CLASS] = ELF_CLASS; ehdr->e_ident[EI_DATA] = ELF_DATA; ehdr->e_ident[EI_VERSION] = EV_CURRENT; ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; ehdr->e_ident[EI_ABIVERSION] = 0; ehdr->e_ident[EI_PAD] = 0; ehdr->e_type = ET_CORE; ehdr->e_machine = td->td_proc->p_elf_machine; ehdr->e_version = EV_CURRENT; ehdr->e_entry = 0; ehdr->e_phoff = sizeof(Elf_Ehdr); ehdr->e_flags = td->td_proc->p_elf_flags; ehdr->e_ehsize = sizeof(Elf_Ehdr); ehdr->e_phentsize = sizeof(Elf_Phdr); ehdr->e_shentsize = sizeof(Elf_Shdr); ehdr->e_shstrndx = SHN_UNDEF; if (numsegs + 1 < PN_XNUM) { ehdr->e_phnum = numsegs + 1; ehdr->e_shnum = 0; } else { ehdr->e_phnum = PN_XNUM; ehdr->e_shnum = 1; ehdr->e_shoff = ehdr->e_phoff + (numsegs + 1) * ehdr->e_phentsize; KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), ("e_shoff: %zu, hdrsize - shdr: %zu", (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); memset(shdr, 0, sizeof(*shdr)); /* * A special first section is used to hold large segment and * section counts. This was proposed by Sun Microsystems in * Solaris and has been adopted by Linux; the standard ELF * tools are already familiar with the technique. * * See table 7-7 of the Solaris "Linker and Libraries Guide" * (or 12-7 depending on the version of the document) for more * details. */ shdr->sh_type = SHT_NULL; shdr->sh_size = ehdr->e_shnum; shdr->sh_link = ehdr->e_shstrndx; shdr->sh_info = numsegs + 1; } /* * Fill in the program header entries. */ phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); /* The note segement. */ phdr->p_type = PT_NOTE; phdr->p_offset = hdrsize; phdr->p_vaddr = 0; phdr->p_paddr = 0; phdr->p_filesz = notesz; phdr->p_memsz = 0; phdr->p_flags = PF_R; phdr->p_align = ELF_NOTE_ROUNDSIZE; phdr++; /* All the writable segments from the program. */ phc.phdr = phdr; phc.offset = round_page(hdrsize + notesz); each_dumpable_segment(td, cb_put_phdr, &phc); } static size_t register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) { struct note_info *ninfo; size_t size, notesize; size = 0; out(arg, NULL, &size); ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); ninfo->type = type; ninfo->outfunc = out; ninfo->outarg = arg; ninfo->outsize = size; TAILQ_INSERT_TAIL(list, ninfo, link); if (type == -1) return (size); notesize = sizeof(Elf_Note) + /* note header */ roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + /* note name */ roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ return (notesize); } static size_t append_note_data(const void *src, void *dst, size_t len) { size_t padded_len; padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); if (dst != NULL) { bcopy(src, dst, len); bzero((char *)dst + len, padded_len - len); } return (padded_len); } size_t __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) { Elf_Note *note; char *buf; size_t notesize; buf = dst; if (buf != NULL) { note = (Elf_Note *)buf; note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); note->n_descsz = size; note->n_type = type; buf += sizeof(*note); buf += append_note_data(FREEBSD_ABI_VENDOR, buf, sizeof(FREEBSD_ABI_VENDOR)); append_note_data(src, buf, size); if (descp != NULL) *descp = buf; } notesize = sizeof(Elf_Note) + /* note header */ roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + /* note name */ roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ return (notesize); } static void __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) { Elf_Note note; ssize_t old_len, sect_len; size_t new_len, descsz, i; if (ninfo->type == -1) { ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); return; } note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); note.n_descsz = ninfo->outsize; note.n_type = ninfo->type; sbuf_bcat(sb, ¬e, sizeof(note)); sbuf_start_section(sb, &old_len); sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); if (note.n_descsz == 0) return; sbuf_start_section(sb, &old_len); ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); if (sect_len < 0) return; new_len = (size_t)sect_len; descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); if (new_len < descsz) { /* * It is expected that individual note emitters will correctly * predict their expected output size and fill up to that size * themselves, padding in a format-specific way if needed. * However, in case they don't, just do it here with zeros. */ for (i = 0; i < descsz - new_len; i++) sbuf_putc(sb, 0); } else if (new_len > descsz) { /* * We can't always truncate sb -- we may have drained some * of it already. */ KASSERT(new_len == descsz, ("%s: Note type %u changed as we " "read it (%zu > %zu). Since it is longer than " "expected, this coredump's notes are corrupt. THIS " "IS A BUG in the note_procstat routine for type %u.\n", __func__, (unsigned)note.n_type, new_len, descsz, (unsigned)note.n_type)); } } /* * Miscellaneous note out functions. */ #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 #include #include typedef struct prstatus32 elf_prstatus_t; typedef struct prpsinfo32 elf_prpsinfo_t; typedef struct fpreg32 elf_prfpregset_t; typedef struct fpreg32 elf_fpregset_t; typedef struct reg32 elf_gregset_t; typedef struct thrmisc32 elf_thrmisc_t; #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 typedef struct kinfo_proc32 elf_kinfo_proc_t; typedef uint32_t elf_ps_strings_t; #else typedef prstatus_t elf_prstatus_t; typedef prpsinfo_t elf_prpsinfo_t; typedef prfpregset_t elf_prfpregset_t; typedef prfpregset_t elf_fpregset_t; typedef gregset_t elf_gregset_t; typedef thrmisc_t elf_thrmisc_t; #define ELF_KERN_PROC_MASK 0 typedef struct kinfo_proc elf_kinfo_proc_t; typedef vm_offset_t elf_ps_strings_t; #endif static void __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) { struct sbuf sbarg; size_t len; char *cp, *end; struct proc *p; elf_prpsinfo_t *psinfo; int error; p = (struct proc *)arg; if (sb != NULL) { KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); psinfo->pr_version = PRPSINFO_VERSION; psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); PROC_LOCK(p); if (p->p_args != NULL) { len = sizeof(psinfo->pr_psargs) - 1; if (len > p->p_args->ar_length) len = p->p_args->ar_length; memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); PROC_UNLOCK(p); error = 0; } else { _PHOLD(p); PROC_UNLOCK(p); sbuf_new(&sbarg, psinfo->pr_psargs, sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); error = proc_getargv(curthread, p, &sbarg); PRELE(p); if (sbuf_finish(&sbarg) == 0) len = sbuf_len(&sbarg) - 1; else len = sizeof(psinfo->pr_psargs) - 1; sbuf_delete(&sbarg); } if (error || len == 0) strlcpy(psinfo->pr_psargs, p->p_comm, sizeof(psinfo->pr_psargs)); else { KASSERT(len < sizeof(psinfo->pr_psargs), ("len is too long: %zu vs %zu", len, sizeof(psinfo->pr_psargs))); cp = psinfo->pr_psargs; end = cp + len - 1; for (;;) { cp = memchr(cp, '\0', end - cp); if (cp == NULL) break; *cp = ' '; } } psinfo->pr_pid = p->p_pid; sbuf_bcat(sb, psinfo, sizeof(*psinfo)); free(psinfo, M_TEMP); } *sizep = sizeof(*psinfo); } static void __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) { struct thread *td; elf_prstatus_t *status; td = (struct thread *)arg; if (sb != NULL) { KASSERT(*sizep == sizeof(*status), ("invalid size")); status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); status->pr_version = PRSTATUS_VERSION; status->pr_statussz = sizeof(elf_prstatus_t); status->pr_gregsetsz = sizeof(elf_gregset_t); status->pr_fpregsetsz = sizeof(elf_fpregset_t); status->pr_osreldate = osreldate; status->pr_cursig = td->td_proc->p_sig; status->pr_pid = td->td_tid; #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 fill_regs32(td, &status->pr_reg); #else fill_regs(td, &status->pr_reg); #endif sbuf_bcat(sb, status, sizeof(*status)); free(status, M_TEMP); } *sizep = sizeof(*status); } static void __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) { struct thread *td; elf_prfpregset_t *fpregset; td = (struct thread *)arg; if (sb != NULL) { KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 fill_fpregs32(td, fpregset); #else fill_fpregs(td, fpregset); #endif sbuf_bcat(sb, fpregset, sizeof(*fpregset)); free(fpregset, M_TEMP); } *sizep = sizeof(*fpregset); } static void __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) { struct thread *td; elf_thrmisc_t thrmisc; td = (struct thread *)arg; if (sb != NULL) { KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); bzero(&thrmisc._pad, sizeof(thrmisc._pad)); strcpy(thrmisc.pr_tname, td->td_name); sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); } *sizep = sizeof(thrmisc); } static void __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) { struct thread *td; size_t size; int structsize; #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 struct ptrace_lwpinfo32 pl; #else struct ptrace_lwpinfo pl; #endif td = (struct thread *)arg; size = sizeof(structsize) + sizeof(pl); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(pl); sbuf_bcat(sb, &structsize, sizeof(structsize)); bzero(&pl, sizeof(pl)); pl.pl_lwpid = td->td_tid; pl.pl_event = PL_EVENT_NONE; pl.pl_sigmask = td->td_sigmask; pl.pl_siglist = td->td_siglist; if (td->td_si.si_signo != 0) { pl.pl_event = PL_EVENT_SIGNAL; pl.pl_flags |= PL_FLAG_SI; #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); #else pl.pl_siginfo = td->td_si; #endif } strcpy(pl.pl_tdname, td->td_name); /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ sbuf_bcat(sb, &pl, sizeof(pl)); } *sizep = size; } /* * Allow for MD specific notes, as well as any MD * specific preparations for writing MI notes. */ static void __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) { struct thread *td; void *buf; size_t size; td = (struct thread *)arg; size = *sizep; if (size != 0 && sb != NULL) buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); else buf = NULL; size = 0; __elfN(dump_thread)(td, buf, &size); KASSERT(sb == NULL || *sizep == size, ("invalid size")); if (size != 0 && sb != NULL) sbuf_bcat(sb, buf, size); free(buf, M_TEMP); *sizep = size; } #ifdef KINFO_PROC_SIZE CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); #endif static void __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size; int structsize; p = (struct proc *)arg; size = sizeof(structsize) + p->p_numthreads * sizeof(elf_kinfo_proc_t); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(elf_kinfo_proc_t); sbuf_bcat(sb, &structsize, sizeof(structsize)); PROC_LOCK(p); kern_proc_out(p, sb, ELF_KERN_PROC_MASK); } *sizep = size; } #ifdef KINFO_FILE_SIZE CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); #endif static void note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size, sect_sz, i; ssize_t start_len, sect_len; int structsize, filedesc_flags; if (coredump_pack_fileinfo) filedesc_flags = KERN_FILEDESC_PACK_KINFO; else filedesc_flags = 0; p = (struct proc *)arg; structsize = sizeof(struct kinfo_file); if (sb == NULL) { size = 0; sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); sbuf_set_drain(sb, sbuf_count_drain, &size); sbuf_bcat(sb, &structsize, sizeof(structsize)); PROC_LOCK(p); kern_proc_filedesc_out(p, sb, -1, filedesc_flags); sbuf_finish(sb); sbuf_delete(sb); *sizep = size; } else { sbuf_start_section(sb, &start_len); sbuf_bcat(sb, &structsize, sizeof(structsize)); PROC_LOCK(p); kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), filedesc_flags); sect_len = sbuf_end_section(sb, start_len, 0, 0); if (sect_len < 0) return; sect_sz = sect_len; KASSERT(sect_sz <= *sizep, ("kern_proc_filedesc_out did not respect maxlen; " "requested %zu, got %zu", *sizep - sizeof(structsize), sect_sz - sizeof(structsize))); for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) sbuf_putc(sb, 0); } } #ifdef KINFO_VMENTRY_SIZE CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); #endif static void note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size; int structsize, vmmap_flags; if (coredump_pack_vmmapinfo) vmmap_flags = KERN_VMMAP_PACK_KINFO; else vmmap_flags = 0; p = (struct proc *)arg; structsize = sizeof(struct kinfo_vmentry); if (sb == NULL) { size = 0; sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); sbuf_set_drain(sb, sbuf_count_drain, &size); sbuf_bcat(sb, &structsize, sizeof(structsize)); PROC_LOCK(p); kern_proc_vmmap_out(p, sb, -1, vmmap_flags); sbuf_finish(sb); sbuf_delete(sb); *sizep = size; } else { sbuf_bcat(sb, &structsize, sizeof(structsize)); PROC_LOCK(p); kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), vmmap_flags); } } static void note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size; int structsize; p = (struct proc *)arg; size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(gid_t); sbuf_bcat(sb, &structsize, sizeof(structsize)); sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * sizeof(gid_t)); } *sizep = size; } static void note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size; int structsize; p = (struct proc *)arg; size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(p->p_fd->fd_cmask); sbuf_bcat(sb, &structsize, sizeof(structsize)); sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); } *sizep = size; } static void note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; struct rlimit rlim[RLIM_NLIMITS]; size_t size; int structsize, i; p = (struct proc *)arg; size = sizeof(structsize) + sizeof(rlim); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(rlim); sbuf_bcat(sb, &structsize, sizeof(structsize)); PROC_LOCK(p); for (i = 0; i < RLIM_NLIMITS; i++) lim_rlimit_proc(p, i, &rlim[i]); PROC_UNLOCK(p); sbuf_bcat(sb, rlim, sizeof(rlim)); } *sizep = size; } static void note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size; int structsize; p = (struct proc *)arg; size = sizeof(structsize) + sizeof(p->p_osrel); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(p->p_osrel); sbuf_bcat(sb, &structsize, sizeof(structsize)); sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); } *sizep = size; } static void __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; elf_ps_strings_t ps_strings; size_t size; int structsize; p = (struct proc *)arg; size = sizeof(structsize) + sizeof(ps_strings); if (sb != NULL) { KASSERT(*sizep == size, ("invalid size")); structsize = sizeof(ps_strings); #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 ps_strings = PTROUT(p->p_sysent->sv_psstrings); #else ps_strings = p->p_sysent->sv_psstrings; #endif sbuf_bcat(sb, &structsize, sizeof(structsize)); sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); } *sizep = size; } static void __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) { struct proc *p; size_t size; int structsize; p = (struct proc *)arg; if (sb == NULL) { size = 0; sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); sbuf_set_drain(sb, sbuf_count_drain, &size); sbuf_bcat(sb, &structsize, sizeof(structsize)); PHOLD(p); proc_getauxv(curthread, p, sb); PRELE(p); sbuf_finish(sb); sbuf_delete(sb); *sizep = size; } else { structsize = sizeof(Elf_Auxinfo); sbuf_bcat(sb, &structsize, sizeof(structsize)); PHOLD(p); proc_getauxv(curthread, p, sb); PRELE(p); } } static boolean_t __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote, const char *note_vendor, const Elf_Phdr *pnote, boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg) { const Elf_Note *note, *note0, *note_end; const char *note_name; char *buf; int i, error; boolean_t res; /* We need some limit, might as well use PAGE_SIZE. */ if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) return (FALSE); ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); if (pnote->p_offset > PAGE_SIZE || pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { buf = malloc(pnote->p_filesz, M_TEMP, M_NOWAIT); if (buf == NULL) { VOP_UNLOCK(imgp->vp, 0); buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); vn_lock(imgp->vp, LK_SHARED | LK_RETRY); } error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, curthread->td_ucred, NOCRED, NULL, curthread); if (error != 0) { uprintf("i/o error PT_NOTE\n"); goto retf; } note = note0 = (const Elf_Note *)buf; note_end = (const Elf_Note *)(buf + pnote->p_filesz); } else { note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset); note_end = (const Elf_Note *)(imgp->image_header + pnote->p_offset + pnote->p_filesz); buf = NULL; } for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { if (!aligned(note, Elf32_Addr) || (const char *)note_end - (const char *)note < sizeof(Elf_Note)) { goto retf; } if (note->n_namesz != checknote->n_namesz || note->n_descsz != checknote->n_descsz || note->n_type != checknote->n_type) goto nextnote; note_name = (const char *)(note + 1); if (note_name + checknote->n_namesz >= (const char *)note_end || strncmp(note_vendor, note_name, checknote->n_namesz) != 0) goto nextnote; if (cb(note, cb_arg, &res)) goto ret; nextnote: note = (const Elf_Note *)((const char *)(note + 1) + roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); } retf: res = FALSE; ret: free(buf, M_TEMP); return (res); } struct brandnote_cb_arg { Elf_Brandnote *brandnote; int32_t *osrel; }; static boolean_t brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res) { struct brandnote_cb_arg *arg; arg = arg0; /* * Fetch the osreldate for binary from the ELF OSABI-note if * necessary. */ *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 && arg->brandnote->trans_osrel != NULL ? arg->brandnote->trans_osrel(note, arg->osrel) : TRUE; return (TRUE); } static Elf_Note fctl_note = { .n_namesz = sizeof(FREEBSD_ABI_VENDOR), .n_descsz = sizeof(uint32_t), .n_type = NT_FREEBSD_FEATURE_CTL, }; struct fctl_cb_arg { uint32_t *fctl0; }; static boolean_t note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res) { struct fctl_cb_arg *arg; const Elf32_Word *desc; uintptr_t p; arg = arg0; p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); desc = (const Elf32_Word *)p; *arg->fctl0 = desc[0]; return (TRUE); } /* * Try to find the appropriate ABI-note section for checknote, fetch * the osreldate and feature control flags for binary from the ELF * OSABI-note. Only the first page of the image is searched, the same * as for headers. */ static boolean_t __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote, int32_t *osrel, uint32_t *fctl0) { const Elf_Phdr *phdr; const Elf_Ehdr *hdr; struct brandnote_cb_arg b_arg; struct fctl_cb_arg f_arg; int i, j; hdr = (const Elf_Ehdr *)imgp->image_header; phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); b_arg.brandnote = brandnote; b_arg.osrel = osrel; f_arg.fctl0 = fctl0; for (i = 0; i < hdr->e_phnum; i++) { if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp, &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb, &b_arg)) { for (j = 0; j < hdr->e_phnum; j++) { if (phdr[j].p_type == PT_NOTE && __elfN(parse_notes)(imgp, &fctl_note, FREEBSD_ABI_VENDOR, &phdr[j], note_fctl_cb, &f_arg)) break; } return (TRUE); } } return (FALSE); } /* * Tell kern_execve.c about it, with a little help from the linker. */ static struct execsw __elfN(execsw) = { .ex_imgact = __CONCAT(exec_, __elfN(imgact)), .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) }; EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); static vm_prot_t __elfN(trans_prot)(Elf_Word flags) { vm_prot_t prot; prot = 0; if (flags & PF_X) prot |= VM_PROT_EXECUTE; if (flags & PF_W) prot |= VM_PROT_WRITE; if (flags & PF_R) prot |= VM_PROT_READ; #if __ELF_WORD_SIZE == 32 #if defined(__amd64__) if (i386_read_exec && (flags & PF_R)) prot |= VM_PROT_EXECUTE; #endif #endif return (prot); } static Elf_Word __elfN(untrans_prot)(vm_prot_t prot) { Elf_Word flags; flags = 0; if (prot & VM_PROT_EXECUTE) flags |= PF_X; if (prot & VM_PROT_READ) flags |= PF_R; if (prot & VM_PROT_WRITE) flags |= PF_W; return (flags); } void __elfN(stackgap)(struct image_params *imgp, u_long *stack_base) { u_long range, rbase, gap; int pct; if ((imgp->map_flags & MAP_ASLR) == 0) return; pct = __elfN(aslr_stack_gap); if (pct == 0) return; if (pct > 50) pct = 50; range = imgp->eff_stack_sz * pct / 100; arc4rand(&rbase, sizeof(rbase), 0); gap = rbase % range; gap &= ~(sizeof(u_long) - 1); *stack_base -= gap; } Index: stable/12/sys/riscv/riscv/elf_machdep.c =================================================================== --- stable/12/sys/riscv/riscv/elf_machdep.c (revision 354259) +++ stable/12/sys/riscv/riscv/elf_machdep.c (revision 354260) @@ -1,539 +1,525 @@ /*- * Copyright 1996-1998 John D. Polstra. * Copyright (c) 2015 Ruslan Bukin * Copyright (c) 2016 Yukishige Shibata * All rights reserved. * * Portions of this software were developed by SRI International and the * University of Cambridge Computer Laboratory under DARPA/AFRL contract * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. * * Portions of this software were developed by the University of Cambridge * Computer Laboratory as part of the CTSRD Project, with support from the * UK Higher Education Innovation Fund (HEIF). * * 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 u_long elf_hwcap; struct sysentvec elf64_freebsd_sysvec = { .sv_size = SYS_MAXSYSCALL, .sv_table = sysent, .sv_mask = 0, .sv_errsize = 0, .sv_errtbl = NULL, .sv_transtrap = NULL, .sv_fixup = __elfN(freebsd_fixup), .sv_sendsig = sendsig, .sv_sigcode = sigcode, .sv_szsigcode = &szsigcode, .sv_name = "FreeBSD ELF64", .sv_coredump = __elfN(coredump), .sv_imgact_try = NULL, .sv_minsigstksz = MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = USRSTACK, .sv_psstrings = PS_STRINGS, .sv_stackprot = VM_PROT_ALL, .sv_copyout_strings = exec_copyout_strings, .sv_setregs = exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, - .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_ASLR, + .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_ASLR, .sv_set_syscall_retval = cpu_set_syscall_retval, .sv_fetch_syscall_args = cpu_fetch_syscall_args, .sv_syscallnames = syscallnames, + .sv_shared_page_base = SHAREDPAGE, + .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = NULL, .sv_thread_detach = NULL, .sv_trap = NULL, .sv_hwcap = &elf_hwcap, }; INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); static Elf64_Brandinfo freebsd_brand_info = { .brand = ELFOSABI_FREEBSD, .machine = EM_RISCV, .compat_3_brand = "FreeBSD", .emul_path = NULL, .interp_path = "/libexec/ld-elf.so.1", .sysvec = &elf64_freebsd_sysvec, .interp_newpath = NULL, .brand_note = &elf64_freebsd_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t) elf64_insert_brand_entry, &freebsd_brand_info); - -static Elf64_Brandinfo freebsd_brand_oinfo = { - .brand = ELFOSABI_FREEBSD, - .machine = EM_RISCV, - .compat_3_brand = "FreeBSD", - .emul_path = NULL, - .interp_path = "/usr/libexec/ld-elf.so.1", - .sysvec = &elf64_freebsd_sysvec, - .interp_newpath = NULL, - .brand_note = &elf64_freebsd_brandnote, - .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE -}; - -SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, - (sysinit_cfunc_t) elf64_insert_brand_entry, - &freebsd_brand_oinfo); static int debug_kld; SYSCTL_INT(_kern, OID_AUTO, debug_kld, CTLFLAG_RW, &debug_kld, 0, "Activate debug prints in elf_reloc_internal()"); struct type2str_ent { int type; const char *str; }; void elf64_dump_thread(struct thread *td, void *dst, size_t *off) { } /* * Following 4 functions are used to manupilate bits on 32bit interger value. * FIXME: I implemetend for ease-to-understand rather than for well-optimized. */ static uint32_t gen_bitmask(int msb, int lsb) { uint32_t mask; if (msb == sizeof(mask) * 8 - 1) mask = ~0; else mask = (1U << (msb + 1)) - 1; if (lsb > 0) mask &= ~((1U << lsb) - 1); return (mask); } static uint32_t extract_bits(uint32_t x, int msb, int lsb) { uint32_t mask; mask = gen_bitmask(msb, lsb); x &= mask; x >>= lsb; return (x); } static uint32_t insert_bits(uint32_t d, uint32_t s, int msb, int lsb) { uint32_t mask; mask = gen_bitmask(msb, lsb); d &= ~mask; s <<= lsb; s &= mask; return (d | s); } static uint32_t insert_imm(uint32_t insn, uint32_t imm, int imm_msb, int imm_lsb, int insn_lsb) { int insn_msb; uint32_t v; v = extract_bits(imm, imm_msb, imm_lsb); insn_msb = (imm_msb - imm_lsb) + insn_lsb; return (insert_bits(insn, v, insn_msb, insn_lsb)); } /* * The RISC-V ISA is designed so that all of immediate values are * sign-extended. * An immediate value is sometimes generated at runtime by adding * 12bit sign integer and 20bit signed integer. This requests 20bit * immediate value to be ajusted if the MSB of the 12bit immediate * value is asserted (sign-extended value is treated as negative value). * * For example, 0x123800 can be calculated by adding upper 20 bit of * 0x124000 and sign-extended 12bit immediate whose bit pattern is * 0x800 as follows: * 0x123800 * = 0x123000 + 0x800 * = (0x123000 + 0x1000) + (-0x1000 + 0x800) * = (0x123000 + 0x1000) + (0xff...ff800) * = 0x124000 + sign-extention(0x800) */ static uint32_t calc_hi20_imm(uint32_t value) { /* * There is the arithmetical hack that can remove conditional * statement. But I implement it in straightforward way. */ if ((value & 0x800) != 0) value += 0x1000; return (value & ~0xfff); } static const struct type2str_ent t2s[] = { { R_RISCV_NONE, "R_RISCV_NONE" }, { R_RISCV_64, "R_RISCV_64" }, { R_RISCV_JUMP_SLOT, "R_RISCV_JUMP_SLOT" }, { R_RISCV_RELATIVE, "R_RISCV_RELATIVE" }, { R_RISCV_JAL, "R_RISCV_JAL" }, { R_RISCV_CALL, "R_RISCV_CALL" }, { R_RISCV_PCREL_HI20, "R_RISCV_PCREL_HI20" }, { R_RISCV_PCREL_LO12_I, "R_RISCV_PCREL_LO12_I" }, { R_RISCV_PCREL_LO12_S, "R_RISCV_PCREL_LO12_S" }, { R_RISCV_HI20, "R_RISCV_HI20" }, { R_RISCV_LO12_I, "R_RISCV_LO12_I" }, { R_RISCV_LO12_S, "R_RISCV_LO12_S" }, }; static const char * reloctype_to_str(int type) { int i; for (i = 0; i < sizeof(t2s) / sizeof(t2s[0]); ++i) { if (type == t2s[i].type) return t2s[i].str; } return "*unknown*"; } bool elf_is_ifunc_reloc(Elf_Size r_info __unused) { return (false); } /* * Currently kernel loadable module for RISCV is compiled with -fPIC option. * (see also additional CFLAGS definition for RISCV in sys/conf/kmod.mk) * Only R_RISCV_64, R_RISCV_JUMP_SLOT and RISCV_RELATIVE are emitted in * the module. Other relocations will be processed when kernel loadable * modules are built in non-PIC. * * FIXME: only RISCV64 is supported. */ static int elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, int local, elf_lookup_fn lookup) { Elf_Size rtype, symidx; const Elf_Rela *rela; Elf_Addr val, addr; Elf64_Addr *where; Elf_Addr addend; uint32_t before32_1; uint32_t before32; uint64_t before64; uint32_t* insn32p; uint32_t imm20; int error; switch (type) { case ELF_RELOC_RELA: rela = (const Elf_Rela *)data; where = (Elf_Addr *)(relocbase + rela->r_offset); insn32p = (uint32_t*)where; addend = rela->r_addend; rtype = ELF_R_TYPE(rela->r_info); symidx = ELF_R_SYM(rela->r_info); break; default: printf("%s:%d unknown reloc type %d\n", __FUNCTION__, __LINE__, type); return -1; } switch (rtype) { case R_RISCV_NONE: break; case R_RISCV_64: case R_RISCV_JUMP_SLOT: error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; val = addr; before64 = *where; if (*where != val) *where = val; if (debug_kld) printf("%p %c %-24s %016lx -> %016lx\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before64, *where); break; case R_RISCV_RELATIVE: before64 = *where; *where = elf_relocaddr(lf, relocbase + addend); if (debug_kld) printf("%p %c %-24s %016lx -> %016lx\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before64, *where); break; case R_RISCV_JAL: error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; val = addr - (Elf_Addr)where; if ((val <= -(1UL << 20) || (1UL << 20) <= val)) { printf("kldload: huge offset against R_RISCV_JAL\n"); return -1; } before32 = *insn32p; *insn32p = insert_imm(*insn32p, val, 20, 20, 31); *insn32p = insert_imm(*insn32p, val, 10, 1, 21); *insn32p = insert_imm(*insn32p, val, 11, 11, 20); *insn32p = insert_imm(*insn32p, val, 19, 12, 12); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; case R_RISCV_CALL: /* * R_RISCV_CALL relocates 8-byte region that consists * of the sequence of AUIPC and JALR. */ /* calculate and check the pc relative offset. */ error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; val = addr - (Elf_Addr)where; if ((val <= -(1UL << 32) || (1UL << 32) <= val)) { printf("kldload: huge offset against R_RISCV_CALL\n"); return -1; } /* Relocate AUIPC. */ before32 = insn32p[0]; imm20 = calc_hi20_imm(val); insn32p[0] = insert_imm(insn32p[0], imm20, 31, 12, 12); /* Relocate JALR. */ before32_1 = insn32p[1]; insn32p[1] = insert_imm(insn32p[1], val, 11, 0, 20); if (debug_kld) printf("%p %c %-24s %08x %08x -> %08x %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, insn32p[0], before32_1, insn32p[1]); break; case R_RISCV_PCREL_HI20: val = addr - (Elf_Addr)where; insn32p = (uint32_t*)where; before32 = *insn32p; imm20 = calc_hi20_imm(val); *insn32p = insert_imm(*insn32p, imm20, 31, 12, 12); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; case R_RISCV_PCREL_LO12_I: val = addr - (Elf_Addr)where; insn32p = (uint32_t*)where; before32 = *insn32p; *insn32p = insert_imm(*insn32p, addr, 11, 0, 20); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; case R_RISCV_PCREL_LO12_S: val = addr - (Elf_Addr)where; insn32p = (uint32_t*)where; before32 = *insn32p; *insn32p = insert_imm(*insn32p, addr, 11, 5, 25); *insn32p = insert_imm(*insn32p, addr, 4, 0, 7); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; case R_RISCV_HI20: error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; insn32p = (uint32_t*)where; before32 = *insn32p; imm20 = calc_hi20_imm(val); *insn32p = insert_imm(*insn32p, imm20, 31, 12, 12); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; case R_RISCV_LO12_I: error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; val = addr; insn32p = (uint32_t*)where; before32 = *insn32p; *insn32p = insert_imm(*insn32p, addr, 11, 0, 20); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; case R_RISCV_LO12_S: error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; val = addr; insn32p = (uint32_t*)where; before32 = *insn32p; *insn32p = insert_imm(*insn32p, addr, 11, 5, 25); *insn32p = insert_imm(*insn32p, addr, 4, 0, 7); if (debug_kld) printf("%p %c %-24s %08x -> %08x\n", where, (local? 'l': 'g'), reloctype_to_str(rtype), before32, *insn32p); break; default: printf("kldload: unexpected relocation type %ld\n", rtype); return (-1); } return (0); } int elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); } int elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); } int elf_cpu_load_file(linker_file_t lf __unused) { return (0); } int elf_cpu_unload_file(linker_file_t lf __unused) { return (0); } Index: stable/12 =================================================================== --- stable/12 (revision 354259) +++ stable/12 (revision 354260) Property changes on: stable/12 ___________________________________________________________________ Modified: svn:mergeinfo ## -0,0 +0,1 ## Merged /head:r340228-340229,340231