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Differential D22401 Diff 64418 sys/amd64/linux/linux_sysvec.c

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sys/amd64/linux/linux_sysvec.c

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static char *linux_shared_page_mapping; static char *linux_shared_page_mapping;
extern char _binary_linux_locore_o_start; extern char _binary_linux_locore_o_start;
extern char _binary_linux_locore_o_end; extern char _binary_linux_locore_o_end;
extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
static register_t * linux_copyout_strings(struct image_params *imgp); static int linux_copyout_strings(struct image_params *imgp,
register_t **stack_base);
static int linux_fixup_elf(register_t **stack_base, static int linux_fixup_elf(register_t **stack_base,
struct image_params *iparams); struct image_params *iparams);
static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
static void linux_vdso_install(void *param); static void linux_vdso_install(void *param);
static void linux_vdso_deinstall(void *param); static void linux_vdso_deinstall(void *param);
static void linux_set_syscall_retval(struct thread *td, int error); static void linux_set_syscall_retval(struct thread *td, int error);
static int linux_fetch_syscall_args(struct thread *td); static int linux_fetch_syscall_args(struct thread *td);
static void linux_exec_setregs(struct thread *td, struct image_params *imgp, static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
▲ Show 20 Lines • Show All 109 Lines • ▼ Show 20 Lines if (error != EJUSTRETURN)
frame->tf_r10 = frame->tf_rcx; frame->tf_r10 = frame->tf_rcx;
cpu_set_syscall_retval(td, error); cpu_set_syscall_retval(td, error);
/* Restore all registers. */ /* Restore all registers. */
set_pcb_flags(td->td_pcb, PCB_FULL_IRET); set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
} }
static void static int
linux_copyout_auxargs(struct image_params *imgp, u_long *base) linux_copyout_auxargs(struct image_params *imgp, u_long *base)
{ {
Elf_Auxargs *args; Elf_Auxargs *args;
Elf_Auxinfo *argarray, *pos; Elf_Auxinfo *argarray, *pos;
u_long auxlen; u_long auxlen;
struct proc *p; struct proc *p;
int issetugid; int error, issetugid;
p = imgp->proc; p = imgp->proc;
args = (Elf64_Auxargs *)imgp->auxargs; args = (Elf64_Auxargs *)imgp->auxargs;
argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK | M_ZERO); M_WAITOK | M_ZERO);
issetugid = p->p_flag & P_SUGID ? 1 : 0; issetugid = p->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
Show All 21 Lineslinux_copyout_auxargs(struct image_params *imgp, u_long *base)
AUXARGS_ENTRY(pos, AT_NULL, 0); AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP); free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL; imgp->auxargs = NULL;
KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
auxlen = sizeof(*argarray) * (pos - argarray); auxlen = sizeof(*argarray) * (pos - argarray);
*base -= auxlen; *base -= auxlen;
copyout(argarray, (void *)*base, auxlen); error = copyout(argarray, (void *)*base, auxlen);
free(argarray, M_TEMP); free(argarray, M_TEMP);
return (error);
} }
static int static int
linux_fixup_elf(register_t **stack_base, struct image_params *imgp) linux_fixup_elf(register_t **stack_base, struct image_params *imgp)
{ {
Elf_Addr *base; Elf_Addr *base;
base = (Elf64_Addr *)*stack_base; base = (Elf64_Addr *)*stack_base;
base--; base--;
if (suword(base, (uint64_t)imgp->args->argc) == -1) if (suword(base, (uint64_t)imgp->args->argc) == -1)
return (EFAULT); return (EFAULT);
*stack_base = (register_t *)base; *stack_base = (register_t *)base;
return (0); return (0);
} }
/* /*
* Copy strings out to the new process address space, constructing new arg * 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 * and env vector tables. Return a pointer to the base so that it can be used
* as the initial stack pointer. * as the initial stack pointer.
*/ */
static register_t * static int
linux_copyout_strings(struct image_params *imgp) linux_copyout_strings(struct image_params *imgp, register_t **stack_base)
{ {
int argc, envc; int argc, envc, error;
char **vectp; char **vectp;
char *stringp, *destp; char *stringp, *destp;
register_t *stack_base;
struct ps_strings *arginfo; struct ps_strings *arginfo;
char canary[LINUX_AT_RANDOM_LEN]; char canary[LINUX_AT_RANDOM_LEN];
size_t execpath_len; size_t execpath_len;
struct proc *p; struct proc *p;
/* Calculate string base and vector table pointers. */ /* Calculate string base and vector table pointers. */
if (imgp->execpath != NULL && imgp->auxargs != NULL) if (imgp->execpath != NULL && imgp->auxargs != NULL)
execpath_len = strlen(imgp->execpath) + 1; execpath_len = strlen(imgp->execpath) + 1;
else else
execpath_len = 0; execpath_len = 0;
p = imgp->proc; p = imgp->proc;
arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
destp = (caddr_t)arginfo - SPARE_USRSPACE - destp = (caddr_t)arginfo - SPARE_USRSPACE -
roundup(sizeof(canary), sizeof(char *)) - roundup(sizeof(canary), sizeof(char *)) -
roundup(execpath_len, sizeof(char *)) - roundup(execpath_len, sizeof(char *)) -
roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
if (execpath_len != 0) { if (execpath_len != 0) {
imgp->execpathp = (uintptr_t)arginfo - execpath_len; imgp->execpathp = (uintptr_t)arginfo - execpath_len;
copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); error = copyout(imgp->execpath, (void *)imgp->execpathp,
execpath_len);
if (error)
kibUnsubmitted
Done
Inline Actions

if (error != 0) for all places

kib: `if (error != 0)` for all places
return (error);
} }
/* Prepare the canary for SSP. */ /* Prepare the canary for SSP. */
arc4rand(canary, sizeof(canary), 0); arc4rand(canary, sizeof(canary), 0);
imgp->canary = (uintptr_t)arginfo - imgp->canary = (uintptr_t)arginfo -
roundup(execpath_len, sizeof(char *)) - roundup(execpath_len, sizeof(char *)) -
roundup(sizeof(canary), sizeof(char *)); roundup(sizeof(canary), sizeof(char *));
copyout(canary, (void *)imgp->canary, sizeof(canary)); error = copyout(canary, (void *)imgp->canary, sizeof(canary));
if (error)
return (error);
vectp = (char **)destp; vectp = (char **)destp;
/* /*
* Starting with 2.24, glibc depends on a 16-byte stack alignment. * Starting with 2.24, glibc depends on a 16-byte stack alignment.
* One "long argc" will be prepended later. * One "long argc" will be prepended later.
*/ */
vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8); vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
if (imgp->auxargs) if (imgp->auxargs) {
imgp->sysent->sv_copyout_auxargs(imgp, (u_long *)&vectp); error = imgp->sysent->sv_copyout_auxargs(imgp,
(u_long *)&vectp);
if (error)
return (error);
}
/* /*
* Allocate room for the argv[] and env vectors including the * Allocate room for the argv[] and env vectors including the
* terminating NULL pointers. * terminating NULL pointers.
*/ */
vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
/* vectp also becomes our initial stack base. */ /* vectp also becomes our initial stack base. */
stack_base = (register_t *)vectp; *stack_base = (register_t *)vectp;
stringp = imgp->args->begin_argv; stringp = imgp->args->begin_argv;
argc = imgp->args->argc; argc = imgp->args->argc;
envc = imgp->args->envc; envc = imgp->args->envc;
/* Copy out strings - arguments and environment. */ /* Copy out strings - arguments and environment. */
copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); error = copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
if (error)
return (error);
/* Fill in "ps_strings" struct for ps, w, etc. */ /* Fill in "ps_strings" struct for ps, w, etc. */
suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
suword(&arginfo->ps_nargvstr, argc); suword(&arginfo->ps_nargvstr, argc) != 0)
return (EFAULT);
/* Fill in argument portion of vector table. */ /* Fill in argument portion of vector table. */
for (; argc > 0; --argc) { for (; argc > 0; --argc) {
suword(vectp++, (long)(intptr_t)destp); if (suword(vectp++, (long)(intptr_t)destp) != 0)
return (EFAULT);
while (*stringp++ != 0) while (*stringp++ != 0)
destp++; destp++;
destp++; destp++;
} }
/* A null vector table pointer separates the argp's from the envp's. */ /* A null vector table pointer separates the argp's from the envp's. */
suword(vectp++, 0); if (suword(vectp++, 0) != 0)
return (EFAULT);
suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
suword(&arginfo->ps_nenvstr, envc); suword(&arginfo->ps_nenvstr, envc) != 0)
return (EFAULT);
/* Fill in environment portion of vector table. */ /* Fill in environment portion of vector table. */
for (; envc > 0; --envc) { for (; envc > 0; --envc) {
suword(vectp++, (long)(intptr_t)destp); if (suword(vectp++, (long)(intptr_t)destp) != 0)
return (EFAULT);
while (*stringp++ != 0) while (*stringp++ != 0)
destp++; destp++;
destp++; destp++;
} }
/* The end of the vector table is a null pointer. */ /* The end of the vector table is a null pointer. */
suword(vectp, 0); if (suword(vectp, 0) != 0)
return (stack_base); return (EFAULT);
return (0);
} }
/* /*
* Reset registers to default values on exec. * Reset registers to default values on exec.
*/ */
static void static void
linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{ {
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