linux(4): Deduplicate linux_copyout_strings().
It is still present in the 32-bit Linuxulator on amd64. MFC after: 1 week
This commit is contained in:
parent
9e550625f8
commit
6039e966ff
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@ -115,8 +115,6 @@ extern const char *linux_syscallnames[];
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SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
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static int linux_copyout_strings(struct image_params *imgp,
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uintptr_t *stack_base);
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static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
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static void linux_vdso_install(const void *param);
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static void linux_vdso_deinstall(const void *param);
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@ -268,132 +266,6 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
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return (error);
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}
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/*
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* Copy strings out to the new process address space, constructing new arg
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* and env vector tables. Return a pointer to the base so that it can be used
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* as the initial stack pointer.
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*/
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static int
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linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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{
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int argc, envc, error;
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char **vectp;
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char *stringp;
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uintptr_t destp, ustringp;
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struct ps_strings *arginfo;
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char canary[LINUX_AT_RANDOM_LEN];
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size_t execpath_len;
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struct proc *p;
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p = imgp->proc;
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arginfo = (struct ps_strings *)PROC_PS_STRINGS(p);
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destp = (uintptr_t)arginfo;
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
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if (error != 0)
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return (error);
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}
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/* Prepare the canary for SSP. */
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arc4rand(canary, sizeof(canary), 0);
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destp -= roundup(sizeof(canary), sizeof(void *));
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imgp->canary = (void *)destp;
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error = copyout(canary, imgp->canary, sizeof(canary));
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if (error != 0)
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return (error);
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/* Allocate room for the argument and environment strings. */
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destp -= ARG_MAX - imgp->args->stringspace;
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destp = rounddown2(destp, sizeof(void *));
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ustringp = destp;
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if (imgp->auxargs) {
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/*
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* Allocate room on the stack for the ELF auxargs
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* array. It has LINUX_AT_COUNT entries.
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*/
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destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo);
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destp = rounddown2(destp, sizeof(void *));
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}
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vectp = (char **)destp;
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/*
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* Allocate room for the argv[] and env vectors including the
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* terminating NULL pointers.
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*/
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vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
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/*
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* Starting with 2.24, glibc depends on a 16-byte stack alignment.
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* One "long argc" will be prepended later.
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*/
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vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
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/* vectp also becomes our initial stack base. */
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*stack_base = (uintptr_t)vectp;
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stringp = imgp->args->begin_argv;
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argc = imgp->args->argc;
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envc = imgp->args->envc;
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/* Copy out strings - arguments and environment. */
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error = copyout(stringp, (void *)ustringp,
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ARG_MAX - imgp->args->stringspace);
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if (error != 0)
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return (error);
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/* Fill in "ps_strings" struct for ps, w, etc. */
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if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
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suword(&arginfo->ps_nargvstr, argc) != 0)
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return (EFAULT);
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/* Fill in argument portion of vector table. */
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for (; argc > 0; --argc) {
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if (suword(vectp++, ustringp) != 0)
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return (EFAULT);
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while (*stringp++ != 0)
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ustringp++;
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ustringp++;
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}
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/* A null vector table pointer separates the argp's from the envp's. */
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if (suword(vectp++, 0) != 0)
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return (EFAULT);
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if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
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suword(&arginfo->ps_nenvstr, envc) != 0)
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return (EFAULT);
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/* Fill in environment portion of vector table. */
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for (; envc > 0; --envc) {
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if (suword(vectp++, ustringp) != 0)
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return (EFAULT);
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while (*stringp++ != 0)
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ustringp++;
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ustringp++;
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}
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/* The end of the vector table is a null pointer. */
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if (suword(vectp, 0) != 0)
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return (EFAULT);
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if (imgp->auxargs) {
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vectp++;
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error = imgp->sysent->sv_copyout_auxargs(imgp,
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(uintptr_t)vectp);
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if (error != 0)
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return (error);
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}
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return (0);
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}
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/*
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* Reset registers to default values on exec.
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*/
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@ -707,7 +579,7 @@ struct sysentvec elf_linux_sysvec = {
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.sv_psstringssz = sizeof(struct ps_strings),
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_auxargs = linux_copyout_auxargs,
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.sv_copyout_strings = linux_copyout_strings,
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.sv_copyout_strings = __linuxN(copyout_strings),
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.sv_setregs = linux_exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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@ -105,10 +105,6 @@ extern const char *linux_syscallnames[];
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SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
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static int linux_copyout_strings(struct image_params *imgp,
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uintptr_t *stack_base);
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static int linux_elf_fixup(uintptr_t *stack_base,
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struct image_params *iparams);
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static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
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static void linux_vdso_install(const void *param);
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static void linux_vdso_deinstall(const void *param);
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@ -127,7 +123,6 @@ LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
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/* DTrace probes */
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo);
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LINUX_VDSO_SYM_CHAR(linux_platform);
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LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
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@ -225,140 +220,6 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
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return (error);
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}
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static int
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linux_elf_fixup(uintptr_t *stack_base, struct image_params *imgp)
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{
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LIN_SDT_PROBE0(sysvec, linux_elf_fixup, todo);
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return (0);
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}
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/*
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* Copy strings out to the new process address space, constructing new arg
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* and env vector tables. Return a pointer to the base so that it can be used
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* as the initial stack pointer.
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* LINUXTODO: deduplicate against other linuxulator archs
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*/
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static int
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linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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{
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char **vectp;
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char *stringp;
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uintptr_t destp, ustringp;
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struct ps_strings *arginfo;
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char canary[LINUX_AT_RANDOM_LEN];
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size_t execpath_len;
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struct proc *p;
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int argc, envc, error;
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p = imgp->proc;
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arginfo = (struct ps_strings *)PROC_PS_STRINGS(p);
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destp = (uintptr_t)arginfo;
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
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if (error != 0)
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return (error);
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}
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/* Prepare the canary for SSP. */
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arc4rand(canary, sizeof(canary), 0);
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destp -= roundup(sizeof(canary), sizeof(void *));
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imgp->canary = (void *)destp;
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error = copyout(canary, imgp->canary, sizeof(canary));
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if (error != 0)
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return (error);
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/* Allocate room for the argument and environment strings. */
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destp -= ARG_MAX - imgp->args->stringspace;
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destp = rounddown2(destp, sizeof(void *));
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ustringp = destp;
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if (imgp->auxargs) {
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/*
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* Allocate room on the stack for the ELF auxargs
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* array. It has up to LINUX_AT_COUNT entries.
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*/
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destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo);
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destp = rounddown2(destp, sizeof(void *));
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}
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vectp = (char **)destp;
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/*
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* Allocate room for argc and the argv[] and env vectors including the
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* terminating NULL pointers.
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*/
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vectp -= 1 + imgp->args->argc + 1 + imgp->args->envc + 1;
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vectp = (char **)STACKALIGN(vectp);
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/* vectp also becomes our initial stack base. */
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*stack_base = (uintptr_t)vectp;
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stringp = imgp->args->begin_argv;
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argc = imgp->args->argc;
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envc = imgp->args->envc;
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/* Copy out strings - arguments and environment. */
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error = copyout(stringp, (void *)ustringp,
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ARG_MAX - imgp->args->stringspace);
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if (error != 0)
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return (error);
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/* Fill in "ps_strings" struct for ps, w, etc. */
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if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
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suword(&arginfo->ps_nargvstr, argc) != 0)
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return (EFAULT);
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if (suword(vectp++, argc) != 0)
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return (EFAULT);
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/* Fill in argument portion of vector table. */
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for (; argc > 0; --argc) {
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if (suword(vectp++, ustringp) != 0)
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return (EFAULT);
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while (*stringp++ != 0)
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ustringp++;
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ustringp++;
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}
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/* A null vector table pointer separates the argp's from the envp's. */
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if (suword(vectp++, 0) != 0)
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return (EFAULT);
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if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
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suword(&arginfo->ps_nenvstr, envc) != 0)
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return (EFAULT);
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/* Fill in environment portion of vector table. */
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for (; envc > 0; --envc) {
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if (suword(vectp++, ustringp) != 0)
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return (EFAULT);
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while (*stringp++ != 0)
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ustringp++;
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ustringp++;
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}
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/* The end of the vector table is a null pointer. */
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if (suword(vectp, 0) != 0)
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return (EFAULT);
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if (imgp->auxargs) {
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vectp++;
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error = imgp->sysent->sv_copyout_auxargs(imgp,
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(uintptr_t)vectp);
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if (error != 0)
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return (error);
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}
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return (0);
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}
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/*
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* Reset registers to default values on exec.
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*/
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@ -554,7 +415,7 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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struct sysentvec elf_linux_sysvec = {
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.sv_size = LINUX_SYS_MAXSYSCALL,
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.sv_table = linux_sysent,
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.sv_fixup = linux_elf_fixup,
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.sv_fixup = __elfN(freebsd_fixup),
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.sv_sendsig = linux_rt_sendsig,
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.sv_sigcode = &_binary_linux_vdso_so_o_start,
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.sv_szsigcode = &linux_szsigcode,
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@ -572,7 +433,7 @@ struct sysentvec elf_linux_sysvec = {
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.sv_psstringssz = sizeof(struct ps_strings),
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.sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
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.sv_copyout_auxargs = linux_copyout_auxargs,
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.sv_copyout_strings = linux_copyout_strings,
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.sv_copyout_strings = __linuxN(copyout_strings),
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.sv_setregs = linux_exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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@ -41,6 +41,7 @@
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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#include <sys/lock.h>
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@ -50,6 +51,11 @@ __FBSDID("$FreeBSD$");
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#include <sys/procfs.h>
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#include <sys/reg.h>
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#include <sys/sbuf.h>
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#include <sys/sysent.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <machine/elf.h>
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@ -61,6 +67,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/../linux/linux.h>
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#endif
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#include <compat/linux/linux_elf.h>
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#include <compat/linux/linux_misc.h>
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struct l_elf_siginfo {
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l_int si_signo;
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@ -312,3 +319,149 @@ __linuxN(note_nt_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
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PRELE(p);
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}
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}
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/*
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* Copy strings out to the new process address space, constructing new arg
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* and env vector tables. Return a pointer to the base so that it can be used
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* as the initial stack pointer.
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*/
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int
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__linuxN(copyout_strings)(struct image_params *imgp, uintptr_t *stack_base)
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{
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char canary[LINUX_AT_RANDOM_LEN];
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char **vectp;
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char *stringp;
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uintptr_t destp, ustringp;
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struct ps_strings *arginfo;
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struct proc *p;
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size_t execpath_len;
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int argc, envc;
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int error;
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p = imgp->proc;
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destp = PROC_PS_STRINGS(p);
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arginfo = imgp->ps_strings = (void *)destp;
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/*
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* Copy the image path for the rtld.
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*/
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
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if (error != 0)
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return (error);
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}
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/*
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* Prepare the canary for SSP.
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*/
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arc4rand(canary, sizeof(canary), 0);
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destp -= sizeof(canary);
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imgp->canary = (void *)destp;
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error = copyout(canary, imgp->canary, sizeof(canary));
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if (error != 0)
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return (error);
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imgp->canarylen = sizeof(canary);
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/*
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* Allocate room for the argument and environment strings.
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*/
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destp -= ARG_MAX - imgp->args->stringspace;
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destp = rounddown2(destp, sizeof(void *));
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ustringp = destp;
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if (imgp->auxargs) {
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/*
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* Allocate room on the stack for the ELF auxargs
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* array. It has up to LINUX_AT_COUNT entries.
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*/
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destp -= LINUX_AT_COUNT * sizeof(Elf_Auxinfo);
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destp = rounddown2(destp, sizeof(void *));
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}
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vectp = (char **)destp;
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/*
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* Allocate room for the argv[] and env vectors including the
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* terminating NULL pointers.
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*/
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vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
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/*
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* Starting with 2.24, glibc depends on a 16-byte stack alignment.
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*/
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vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
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/*
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* vectp also becomes our initial stack base
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*/
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*stack_base = (uintptr_t)vectp;
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stringp = imgp->args->begin_argv;
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argc = imgp->args->argc;
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envc = imgp->args->envc;
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/*
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* Copy out strings - arguments and environment.
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*/
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error = copyout(stringp, (void *)ustringp,
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ARG_MAX - imgp->args->stringspace);
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if (error != 0)
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return (error);
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/*
|
||||
* Fill in "ps_strings" struct for ps, w, etc.
|
||||
*/
|
||||
imgp->argv = vectp;
|
||||
if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
|
||||
suword32(&arginfo->ps_nargvstr, argc) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
/*
|
||||
* Fill in argument portion of vector table.
|
||||
*/
|
||||
for (; argc > 0; --argc) {
|
||||
if (suword(vectp++, ustringp) != 0)
|
||||
return (EFAULT);
|
||||
while (*stringp++ != 0)
|
||||
ustringp++;
|
||||
ustringp++;
|
||||
}
|
||||
|
||||
/* a null vector table pointer separates the argp's from the envp's */
|
||||
if (suword(vectp++, 0) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
imgp->envv = vectp;
|
||||
if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
|
||||
suword32(&arginfo->ps_nenvstr, envc) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
/*
|
||||
* Fill in environment portion of vector table.
|
||||
*/
|
||||
for (; envc > 0; --envc) {
|
||||
if (suword(vectp++, ustringp) != 0)
|
||||
return (EFAULT);
|
||||
while (*stringp++ != 0)
|
||||
ustringp++;
|
||||
ustringp++;
|
||||
}
|
||||
|
||||
/* end of vector table is a null pointer */
|
||||
if (suword(vectp, 0) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
if (imgp->auxargs) {
|
||||
vectp++;
|
||||
error = imgp->sysent->sv_copyout_auxargs(imgp,
|
||||
(uintptr_t)vectp);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
|
|
@ -38,5 +38,6 @@ struct note_info_list;
|
|||
|
||||
void __linuxN(prepare_notes)(struct thread *, struct note_info_list *,
|
||||
size_t *);
|
||||
int __linuxN(copyout_strings)(struct image_params *, uintptr_t *);
|
||||
|
||||
#endif
|
||||
|
|
|
@ -111,8 +111,6 @@ static void linux_exec_setregs(struct thread *td,
|
|||
static void linux_exec_sysvec_init(void *param);
|
||||
static int linux_on_exec_vmspace(struct proc *p,
|
||||
struct image_params *imgp);
|
||||
static int linux_copyout_strings(struct image_params *imgp,
|
||||
uintptr_t *stack_base);
|
||||
static void linux_set_fork_retval(struct thread *td);
|
||||
static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
|
||||
static void linux_vdso_install(const void *param);
|
||||
|
@ -201,124 +199,6 @@ linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
|
|||
return (error);
|
||||
}
|
||||
|
||||
/*
|
||||
* Copied from kern/kern_exec.c
|
||||
*/
|
||||
static int
|
||||
linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
|
||||
{
|
||||
int argc, envc, error;
|
||||
char **vectp;
|
||||
char *stringp;
|
||||
uintptr_t destp, ustringp;
|
||||
struct ps_strings *arginfo;
|
||||
char canary[LINUX_AT_RANDOM_LEN];
|
||||
size_t execpath_len;
|
||||
struct proc *p;
|
||||
|
||||
p = imgp->proc;
|
||||
arginfo = (struct ps_strings *)PROC_PS_STRINGS(p);
|
||||
destp = (uintptr_t)arginfo;
|
||||
|
||||
if (imgp->execpath != NULL && imgp->auxargs != NULL) {
|
||||
execpath_len = strlen(imgp->execpath) + 1;
|
||||
destp -= execpath_len;
|
||||
destp = rounddown2(destp, sizeof(void *));
|
||||
imgp->execpathp = (void *)destp;
|
||||
error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
/* Prepare the canary for SSP. */
|
||||
arc4rand(canary, sizeof(canary), 0);
|
||||
destp -= roundup(sizeof(canary), sizeof(void *));
|
||||
imgp->canary = (void *)destp;
|
||||
error = copyout(canary, imgp->canary, sizeof(canary));
|
||||
if (error != 0)
|
||||
return (error);
|
||||
|
||||
/* Allocate room for the argument and environment strings. */
|
||||
destp -= ARG_MAX - imgp->args->stringspace;
|
||||
destp = rounddown2(destp, sizeof(void *));
|
||||
ustringp = destp;
|
||||
|
||||
if (imgp->auxargs) {
|
||||
/*
|
||||
* Allocate room on the stack for the ELF auxargs
|
||||
* array. It has LINUX_AT_COUNT entries.
|
||||
*/
|
||||
destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo);
|
||||
destp = rounddown2(destp, sizeof(void *));
|
||||
}
|
||||
|
||||
vectp = (char **)destp;
|
||||
|
||||
/*
|
||||
* Allocate room for the argv[] and env vectors including the
|
||||
* terminating NULL pointers.
|
||||
*/
|
||||
vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
|
||||
|
||||
/* vectp also becomes our initial stack base. */
|
||||
*stack_base = (uintptr_t)vectp;
|
||||
|
||||
stringp = imgp->args->begin_argv;
|
||||
argc = imgp->args->argc;
|
||||
envc = imgp->args->envc;
|
||||
|
||||
/* Copy out strings - arguments and environment. */
|
||||
error = copyout(stringp, (void *)ustringp,
|
||||
ARG_MAX - imgp->args->stringspace);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
|
||||
/* Fill in "ps_strings" struct for ps, w, etc. */
|
||||
if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
|
||||
suword(&arginfo->ps_nargvstr, argc) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
/* Fill in argument portion of vector table. */
|
||||
for (; argc > 0; --argc) {
|
||||
if (suword(vectp++, ustringp) != 0)
|
||||
return (EFAULT);
|
||||
while (*stringp++ != 0)
|
||||
ustringp++;
|
||||
ustringp++;
|
||||
}
|
||||
|
||||
/* A null vector table pointer separates the argp's from the envp's. */
|
||||
if (suword(vectp++, 0) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
|
||||
suword(&arginfo->ps_nenvstr, envc) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
/* Fill in environment portion of vector table. */
|
||||
for (; envc > 0; --envc) {
|
||||
if (suword(vectp++, ustringp) != 0)
|
||||
return (EFAULT);
|
||||
while (*stringp++ != 0)
|
||||
ustringp++;
|
||||
ustringp++;
|
||||
}
|
||||
|
||||
/* The end of the vector table is a null pointer. */
|
||||
if (suword(vectp, 0) != 0)
|
||||
return (EFAULT);
|
||||
|
||||
if (imgp->auxargs) {
|
||||
vectp++;
|
||||
error = imgp->sysent->sv_copyout_auxargs(imgp,
|
||||
(uintptr_t)vectp);
|
||||
if (error != 0)
|
||||
return (error);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static void
|
||||
linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
|
||||
{
|
||||
|
@ -804,7 +684,7 @@ struct sysentvec elf_linux_sysvec = {
|
|||
.sv_psstringssz = sizeof(struct ps_strings),
|
||||
.sv_stackprot = VM_PROT_ALL,
|
||||
.sv_copyout_auxargs = linux_copyout_auxargs,
|
||||
.sv_copyout_strings = linux_copyout_strings,
|
||||
.sv_copyout_strings = __linuxN(copyout_strings),
|
||||
.sv_setregs = linux_exec_setregs,
|
||||
.sv_fixlimit = NULL,
|
||||
.sv_maxssiz = NULL,
|
||||
|
|
Loading…
Reference in New Issue