32#include "opt_capsicum.h"
33#include "opt_hwpmc_hooks.h"
34#include "opt_ktrace.h"
41#include <sys/capsicum.h>
42#include <sys/compressor.h>
43#include <sys/eventhandler.h>
46#include <sys/filedesc.h>
47#include <sys/imgact.h>
48#include <sys/imgact_elf.h>
49#include <sys/kernel.h>
51#include <sys/malloc.h>
58#include <sys/ptrace.h>
60#include <sys/resourcevar.h>
61#include <sys/rwlock.h>
64#include <sys/sf_buf.h>
66#include <sys/signalvar.h>
69#include <sys/syscallsubr.h>
70#include <sys/sysctl.h>
71#include <sys/sysent.h>
72#include <sys/sysproto.h>
73#include <sys/timers.h>
74#include <sys/umtxvar.h>
78#include <sys/ktrace.h>
82#include <vm/vm_param.h>
84#include <vm/vm_page.h>
86#include <vm/vm_kern.h>
87#include <vm/vm_extern.h>
88#include <vm/vm_object.h>
89#include <vm/vm_pager.h>
92#include <sys/pmckern.h>
95#include <security/audit/audit.h>
96#include <security/mac/mac_framework.h>
99#include <sys/dtrace_bsd.h>
100dtrace_execexit_func_t dtrace_fasttrap_exec;
113 "Enable file path packing in 'procstat -f' coredump notes");
118 "Enable file path packing in 'procstat -v' coredump notes");
123static int do_execve(
struct thread *td,
struct image_args *args,
124 struct mac *mac_p,
struct vmspace *oldvmspace);
127SYSCTL_PROC(_kern, KERN_PS_STRINGS, ps_strings, CTLTYPE_ULONG|CTLFLAG_RD|
129 "Location of process' ps_strings structure");
132SYSCTL_PROC(_kern, KERN_USRSTACK, usrstack, CTLTYPE_ULONG|CTLFLAG_RD|
134 "Top of process stack");
136SYSCTL_PROC(_kern, OID_AUTO, stackprot, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_MPSAFE,
138 "Stack memory permissions");
143 "Process' command line characters cache limit");
148 "Disallow execution of binaries built for higher version of the world");
152 "Permit processes to map an object at virtual address 0.");
157 "Core dumping interruptible with SIGKILL");
163 vm_offset_t ps_strings;
167 if (req->flags & SCTL_MASK32) {
169 val = (
unsigned int)PROC_PS_STRINGS(p);
170 return (SYSCTL_OUT(req, &val,
sizeof(val)));
173 ps_strings = PROC_PS_STRINGS(p);
174 return (SYSCTL_OUT(req, &ps_strings,
sizeof(ps_strings)));
185 if (req->flags & SCTL_MASK32) {
188 val32 = round_page((
unsigned int)p->p_vmspace->vm_stacktop);
189 return (SYSCTL_OUT(req, &val32,
sizeof(val32)));
192 val = round_page(p->p_vmspace->vm_stacktop);
193 return (SYSCTL_OUT(req, &val,
sizeof(val)));
202 return (SYSCTL_OUT(req, &p->p_sysent->sv_stackprot,
203 sizeof(p->p_sysent->sv_stackprot)));
212#ifndef _SYS_SYSPROTO_H_
223 struct image_args args;
224 struct vmspace *oldvmspace;
235 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td);
239#ifndef _SYS_SYSPROTO_H_
249 struct image_args args;
250 struct vmspace *oldvmspace;
263 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td);
267#ifndef _SYS_SYSPROTO_H_
280 struct image_args args;
281 struct vmspace *oldvmspace;
292 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td);
305 KASSERT(td == curthread, (
"non-current thread %p", td));
308 if ((p->p_flag & P_HADTHREADS) != 0) {
314 KASSERT(error != 0 || (td->td_pflags & TDP_EXECVMSPC) == 0,
316 *oldvmspace = p->p_vmspace;
321post_execve(
struct thread *td,
int error,
struct vmspace *oldvmspace)
325 KASSERT(td == curthread, (
"non-current thread %p", td));
327 if ((p->p_flag & P_HADTHREADS) != 0) {
333 if (error == EJUSTRETURN)
350kern_execve(
struct thread *td,
struct image_args *args,
struct mac *mac_p,
351 struct vmspace *oldvmspace)
354 TSEXEC(td->td_proc->p_pid, args->begin_argv);
355 AUDIT_ARG_ARGV(args->begin_argv, args->argc,
361 if (args->argc == 0) {
365 return (
do_execve(td, args, mac_p, oldvmspace));
371 imgp->credential_setid =
false;
372 if (imgp->newcred != NULL) {
374 imgp->newcred = NULL;
383do_execve(
struct thread *td,
struct image_args *args,
struct mac *mac_p,
384 struct vmspace *oldvmspace)
386 struct proc *p = td->td_proc;
388 struct ucred *oldcred;
389 struct uidinfo *euip = NULL;
390 uintptr_t stack_base;
391 struct image_params image_params, *imgp;
393 int (*img_first)(
struct image_params *);
394 struct pargs *oldargs = NULL, *newargs = NULL;
395 struct sigacts *oldsigacts = NULL, *newsigacts = NULL;
397 struct ktr_io_params *kiop;
399 struct vnode *oldtextvp, *newtextvp;
400 struct vnode *oldtextdvp, *newtextdvp;
401 char *oldbinname, *newbinname;
402 bool credential_changing;
404 struct label *interpvplabel = NULL;
405 bool will_transition;
408 struct pmckern_procexec pe;
410 int error, i, orig_osrel;
412 Elf_Brandinfo *orig_brandinfo;
413 size_t freepath_size;
414 static const char fexecv_proc_title[] =
"(fexecv)";
416 imgp = &image_params;
417 oldtextvp = oldtextdvp = NULL;
418 newtextvp = newtextdvp = NULL;
419 newbinname = oldbinname = NULL;
432 KASSERT((p->p_flag & P_INEXEC) == 0,
433 (
"%s(): process already has P_INEXEC flag", __func__));
434 p->p_flag |= P_INEXEC;
440 bzero(imgp,
sizeof(*imgp));
444 oldcred = p->p_ucred;
445 orig_osrel = p->p_osrel;
446 orig_fctl0 = p->p_fctl0;
447 orig_brandinfo = p->p_elf_brandinfo;
450 error = mac_execve_enter(imgp, mac_p);
455 SDT_PROBE1(proc, , , exec, args->fname);
458 if (args->fname != NULL) {
459#ifdef CAPABILITY_MODE
466 if (IN_CAPABILITY_MODE(td)) {
476 NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | LOCKSHARED | FOLLOW |
477 SAVENAME | AUDITVNODE1 | WANTPARENT, UIO_SYSSPACE,
484 newtextvp = nd.ni_vp;
485 newtextdvp = nd.ni_dvp;
487 newbinname =
malloc(nd.ni_cnd.cn_namelen + 1, M_PARGS,
489 memcpy(newbinname, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen);
490 newbinname[nd.ni_cnd.cn_namelen] =
'\0';
491 imgp->vp = newtextvp;
496 if (args->fname[0] ==
'/') {
497 imgp->execpath = args->fname;
499 VOP_UNLOCK(imgp->vp);
500 freepath_size = MAXPATHLEN;
502 newbinname, nd.ni_cnd.cn_namelen, &imgp->execpath,
503 &imgp->freepath, &freepath_size) != 0)
504 imgp->execpath = args->fname;
505 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
508 AUDIT_ARG_FD(args->fd);
524 &imgp->freepath) != 0)
525 imgp->execpath = args->fname;
526 vn_lock(newtextvp, LK_SHARED | LK_RETRY);
527 AUDIT_ARG_VNODE1(newtextvp);
528 imgp->vp = newtextvp;
537 goto exec_fail_dealloc;
539 imgp->object = imgp->vp->v_object;
540 if (imgp->object != NULL)
541 vm_object_reference(imgp->object);
545 goto exec_fail_dealloc;
547 imgp->proc->p_osrel = 0;
548 imgp->proc->p_fctl0 = 0;
549 imgp->proc->p_elf_brandinfo = NULL;
571 credential_changing =
false;
572 credential_changing |= (attr.va_mode & S_ISUID) &&
573 oldcred->cr_uid != attr.va_uid;
574 credential_changing |= (attr.va_mode & S_ISGID) &&
575 oldcred->cr_gid != attr.va_gid;
577 will_transition = mac_vnode_execve_will_transition(oldcred, imgp->vp,
578 interpvplabel, imgp) != 0;
579 credential_changing |= will_transition;
583 if (credential_changing)
584 imgp->proc->p_pdeathsig = 0;
586 if (credential_changing &&
587#ifdef CAPABILITY_MODE
588 ((oldcred->cr_flags & CRED_FLAG_CAPMODE) == 0) &&
590 (imgp->vp->v_mount->mnt_flag & MNT_NOSUID) == 0 &&
591 (p->p_flag & P_TRACED) == 0) {
592 imgp->credential_setid =
true;
593 VOP_UNLOCK(imgp->vp);
594 imgp->newcred =
crdup(oldcred);
595 if (attr.va_mode & S_ISUID) {
596 euip =
uifind(attr.va_uid);
599 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
600 if (attr.va_mode & S_ISGID)
624 if (oldcred->cr_svuid != oldcred->cr_uid ||
625 oldcred->cr_svgid != oldcred->cr_gid) {
626 VOP_UNLOCK(imgp->vp);
627 imgp->newcred =
crdup(oldcred);
628 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
641 if ((img_first = imgp->proc->p_sysent->sv_imgact_try) != NULL)
642 error = img_first(imgp);
649 for (i = 0; error == -1 &&
execsw[i]; ++i) {
650 if (
execsw[i]->ex_imgact == NULL ||
651 execsw[i]->ex_imgact == img_first) {
654 error = (*
execsw[i]->ex_imgact)(imgp);
660 goto exec_fail_dealloc;
667 if (imgp->interpreted) {
676 MPASS(imgp->textset);
677 VOP_UNSET_TEXT_CHECKED(newtextvp);
678 imgp->textset =
false;
681 mac_execve_interpreter_enter(newtextvp, &interpvplabel);
684 VOP_CLOSE(newtextvp, FREAD, td->td_ucred, td);
685 imgp->opened =
false;
688 imgp->vp = newtextvp = NULL;
689 if (args->fname != NULL) {
690 if (newtextdvp != NULL) {
694 NDFREE(&nd, NDF_ONLY_PNBUF);
695 free(newbinname, M_PARGS);
698 vm_object_deallocate(imgp->object);
701 imgp->execpath = NULL;
702 free(imgp->freepath, M_TEMP);
703 imgp->freepath = NULL;
705 args->fname = imgp->interpreter_name;
713 VOP_UNLOCK(imgp->vp);
716 P_OSREL_MAJOR(p->p_osrel) > P_OSREL_MAJOR(__FreeBSD_version)) {
718 uprintf(
"Osrel %d for image %s too high\n", p->p_osrel,
719 imgp->execpath != NULL ? imgp->execpath :
"<unresolved>");
720 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
721 goto exec_fail_dealloc;
727 error = (*p->p_sysent->sv_copyout_strings)(imgp, &stack_base);
729 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
730 goto exec_fail_dealloc;
736 error = (*p->p_sysent->sv_fixup)(&stack_base, imgp);
738 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
739 goto exec_fail_dealloc;
758 bcopy(imgp->args->begin_argv, newargs->ar_args, i);
768 oldsigacts = p->p_sigacts;
773 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
777 p->p_sigacts = newsigacts;
785 bzero(p->p_comm,
sizeof(p->p_comm));
787 bcopy(nd.ni_cnd.cn_nameptr, p->p_comm,
788 min(nd.ni_cnd.cn_namelen, MAXCOMLEN));
789 else if (
vn_commname(newtextvp, p->p_comm,
sizeof(p->p_comm)) != 0)
790 bcopy(fexecv_proc_title, p->p_comm,
sizeof(fexecv_proc_title));
791 bcopy(p->p_comm, td->td_name,
sizeof(td->td_name));
793 sched_clear_tdname(td);
801 if ((p->p_flag2 & P2_NOTRACE_EXEC) == 0)
802 p->p_flag2 &= ~P2_NOTRACE;
803 if ((p->p_flag2 & P2_STKGAP_DISABLE_EXEC) == 0)
804 p->p_flag2 &= ~P2_STKGAP_DISABLE;
805 if (p->p_flag & P_PPWAIT) {
806 p->p_flag &= ~(P_PPWAIT | P_PPTRACE);
807 cv_broadcast(&p->p_pwait);
812 if ((imgp->sysent->sv_setid_allowed != NULL &&
813 !(*imgp->sysent->sv_setid_allowed)(td, imgp)) ||
814 (p->p_flag2 & P2_NO_NEW_PRIVS) != 0)
820 if (imgp->credential_setid) {
828 kiop = ktrprocexec(p);
838 VOP_UNLOCK(imgp->vp);
841 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
843 goto exec_fail_dealloc;
846 if (will_transition) {
847 mac_vnode_execve_transition(oldcred, imgp->newcred,
848 imgp->vp, interpvplabel, imgp);
852 if (oldcred->cr_uid == oldcred->cr_ruid &&
853 oldcred->cr_gid == oldcred->cr_rgid)
854 p->p_flag &= ~P_SUGID;
859 if (imgp->newcred != NULL) {
869 oldtextvp = p->p_textvp;
870 p->p_textvp = newtextvp;
871 oldtextdvp = p->p_textdvp;
872 p->p_textdvp = newtextdvp;
874 oldbinname = p->p_binname;
875 p->p_binname = newbinname;
883 if (dtrace_fasttrap_exec)
884 dtrace_fasttrap_exec(p);
891 KNOTE_LOCKED(p->p_klist, NOTE_EXEC);
892 p->p_flag &= ~P_INEXEC;
895 p->p_acflag &= ~AFORK;
914 if (PMC_SYSTEM_SAMPLING_ACTIVE() || PMC_PROC_IS_USING_PMCS(p)) {
915 VOP_UNLOCK(imgp->vp);
916 pe.pm_credentialschanged = credential_changing;
917 pe.pm_entryaddr = imgp->entry_addr;
919 PMC_CALL_HOOK_X(td, PMC_FN_PROCESS_EXEC, (
void *) &pe);
920 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
925 (*p->p_sysent->sv_setregs)(td, imgp, stack_base);
927 VOP_MMAPPED(imgp->vp);
929 SDT_PROBE1(proc, , , exec__success, args->fname);
933 p->p_osrel = orig_osrel;
934 p->p_fctl0 = orig_fctl0;
935 p->p_elf_brandinfo = orig_brandinfo;
938 if (imgp->firstpage != NULL)
941 if (imgp->vp != NULL) {
943 VOP_CLOSE(imgp->vp, FREAD, td->td_ucred, td);
945 VOP_UNSET_TEXT_CHECKED(imgp->vp);
949 VOP_UNLOCK(imgp->vp);
950 if (args->fname != NULL)
951 NDFREE(&nd, NDF_ONLY_PNBUF);
952 if (newtextdvp != NULL)
954 free(newbinname, M_PARGS);
957 if (imgp->object != NULL)
958 vm_object_deallocate(imgp->object);
960 free(imgp->freepath, M_TEMP);
963 if (p->p_ptevents & PTRACE_EXEC) {
965 if (p->p_ptevents & PTRACE_EXEC)
966 td->td_dbgflags |= TDB_EXEC;
973 p->p_flag &= ~P_INEXEC;
976 SDT_PROBE1(proc, , , exec__failure, error);
979 if (imgp->newcred != NULL && oldcred != NULL)
983 mac_execve_exit(imgp);
984 mac_execve_interpreter_exit(interpvplabel);
991 if (oldtextvp != NULL)
993 if (oldtextdvp != NULL)
995 free(oldbinname, M_PARGS);
997 ktr_io_params_free(kiop);
1001 if (oldsigacts != NULL)
1006 if (error && imgp->vmspace_destroyed) {
1009 exit1(td, 0, SIGABRT);
1024 return (error == 0 ? EJUSTRETURN : error);
1030 if ((td->td_pflags & TDP_EXECVMSPC) != 0) {
1031 KASSERT(td->td_proc->p_vmspace != oldvmspace,
1032 (
"oldvmspace still used"));
1033 vmspace_free(oldvmspace);
1034 td->td_pflags &= ~TDP_EXECVMSPC;
1045 if (imgp->firstpage != NULL)
1048 object = imgp->vp->v_object;
1051#if VM_NRESERVLEVEL > 0
1052 if ((object->flags & OBJ_COLORED) == 0) {
1053 VM_OBJECT_WLOCK(
object);
1054 vm_object_color(
object, 0);
1055 VM_OBJECT_WUNLOCK(
object);
1058 error = vm_page_grab_valid_unlocked(&m,
object, 0,
1059 VM_ALLOC_COUNT(VM_INITIAL_PAGEIN) |
1060 VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY | VM_ALLOC_WIRED);
1062 if (error != VM_PAGER_OK)
1065 imgp->image_header = (
char *)sf_buf_kva(imgp->firstpage);
1075 if (imgp->firstpage != NULL) {
1076 m = sf_buf_page(imgp->firstpage);
1078 imgp->firstpage = NULL;
1079 vm_page_unwire(m, PQ_ACTIVE);
1099 struct vmspace *vmspace;
1100 struct sysentvec *sv;
1102 vmspace = p->p_vmspace;
1103 if (refcount_load(&vmspace->vm_refcnt) != 1)
1107 if (sv->sv_shared_page_obj == NULL)
1110 pmap_remove(vmspace_pmap(vmspace), sv->sv_shared_page_base,
1111 sv->sv_shared_page_base + sv->sv_shared_page_len);
1122 struct proc *p = imgp->proc;
1123 struct vmspace *vmspace = p->p_vmspace;
1124 struct thread *td = curthread;
1126 vm_offset_t sv_minuser;
1129 imgp->vmspace_destroyed =
true;
1132 if (p->p_sysent->sv_onexec_old != NULL)
1133 p->p_sysent->sv_onexec_old(td);
1136 EVENTHANDLER_DIRECT_INVOKE(process_exec, p, imgp);
1143 map = &vmspace->vm_map;
1145 sv_minuser = sv->sv_minuser;
1147 sv_minuser = MAX(sv->sv_minuser, PAGE_SIZE);
1148 if (refcount_load(&vmspace->vm_refcnt) == 1 &&
1149 vm_map_min(map) == sv_minuser &&
1150 vm_map_max(map) == sv->sv_maxuser &&
1151 cpu_exec_vmspace_reuse(p, map)) {
1154 pmap_remove_pages(vmspace_pmap(vmspace));
1155 vm_map_remove(map, vm_map_min(map), vm_map_max(map));
1161 vm_map_modflags(map, 0, MAP_WIREFUTURE | MAP_ASLR |
1162 MAP_ASLR_IGNSTART | MAP_ASLR_STACK | MAP_WXORX);
1165 error = vmspace_exec(p, sv_minuser, sv->sv_maxuser);
1168 vmspace = p->p_vmspace;
1169 map = &vmspace->vm_map;
1171 map->flags |= imgp->map_flags;
1174 obj = sv->sv_shared_page_obj;
1176 vm_object_reference(obj);
1177 error = vm_map_fixed(map, obj, 0,
1178 sv->sv_shared_page_base, sv->sv_shared_page_len,
1179 VM_PROT_READ | VM_PROT_EXECUTE,
1180 VM_PROT_READ | VM_PROT_EXECUTE,
1181 MAP_INHERIT_SHARE | MAP_ACC_NO_CHARGE);
1182 if (error != KERN_SUCCESS) {
1183 vm_object_deallocate(obj);
1184 return (vm_mmap_to_errno(error));
1188 return (sv->sv_onexec != NULL ? sv->sv_onexec(p, imgp) : 0);
1197 struct rlimit rlim_stack;
1198 struct sysentvec *sv;
1201 struct vmspace *vmspace;
1202 vm_offset_t stack_addr, stack_top;
1204 int error, find_space, stack_off;
1205 vm_prot_t stack_prot;
1210 if (imgp->stack_sz != 0) {
1211 ssiz = trunc_page(imgp->stack_sz);
1215 if (ssiz > rlim_stack.rlim_max)
1216 ssiz = rlim_stack.rlim_max;
1217 if (ssiz > rlim_stack.rlim_cur) {
1218 rlim_stack.rlim_cur = ssiz;
1221 }
else if (sv->sv_maxssiz != NULL) {
1222 ssiz = *sv->sv_maxssiz;
1227 vmspace = p->p_vmspace;
1228 map = &vmspace->vm_map;
1230 stack_prot = sv->sv_shared_page_obj != NULL && imgp->stack_prot != 0 ?
1231 imgp->stack_prot : sv->sv_stackprot;
1232 if ((map->flags & MAP_ASLR_STACK) != 0) {
1233 stack_addr = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
1234 lim_max(curthread, RLIMIT_DATA));
1235 find_space = VMFS_ANY_SPACE;
1237 stack_addr = sv->sv_usrstack - ssiz;
1238 find_space = VMFS_NO_SPACE;
1240 error = vm_map_find(map, NULL, 0, &stack_addr, (vm_size_t)ssiz,
1241 sv->sv_usrstack, find_space, stack_prot, VM_PROT_ALL,
1242 MAP_STACK_GROWS_DOWN);
1243 if (error != KERN_SUCCESS) {
1244 uprintf(
"exec_new_vmspace: mapping stack size %#jx prot %#x "
1245 "failed, mach error %d errno %d\n", (uintmax_t)ssiz,
1246 stack_prot, error, vm_mmap_to_errno(error));
1247 return (vm_mmap_to_errno(error));
1250 stack_top = stack_addr + ssiz;
1251 if ((map->flags & MAP_ASLR_STACK) != 0) {
1253 arc4rand(&stack_off,
sizeof(stack_off), 0);
1254 stack_top -= rounddown2(stack_off & PAGE_MASK,
sizeof(
void *));
1261 vmspace->vm_maxsaddr = (
char *)stack_addr;
1262 vmspace->vm_stacktop = stack_top;
1263 vmspace->vm_ssize =
sgrowsiz >> PAGE_SHIFT;
1274 enum uio_seg segflg,
char **argv,
char **envv)
1279 bzero(args,
sizeof(*args));
1302 error = fueword(argv++, &arg);
1320 error = fueword(envv++, &env);
1328 (
char *)(uintptr_t)env, UIO_USERSPACE);
1350static struct mtx exec_args_kva_mtx;
1351static u_int exec_args_gen;
1354exec_prealloc_args_kva(
void *arg __unused)
1359 SLIST_INIT(&exec_args_kva_freelist);
1360 mtx_init(&exec_args_kva_mtx,
"exec args kva", NULL, MTX_DEF);
1361 for (i = 0; i < exec_map_entries; i++) {
1362 argkva =
malloc(
sizeof(*argkva), M_PARGS, M_WAITOK);
1363 argkva->
addr = kmap_alloc_wait(exec_map, exec_map_entry_size);
1364 argkva->
gen = exec_args_gen;
1365 SLIST_INSERT_HEAD(&exec_args_kva_freelist, argkva, next);
1375 argkva = (
void *)atomic_readandclear_ptr(
1377 if (argkva == NULL) {
1378 mtx_lock(&exec_args_kva_mtx);
1379 while ((argkva = SLIST_FIRST(&exec_args_kva_freelist)) == NULL)
1380 (void)mtx_sleep(&exec_args_kva_freelist,
1381 &exec_args_kva_mtx, 0,
"execkva", 0);
1382 SLIST_REMOVE_HEAD(&exec_args_kva_freelist, next);
1383 mtx_unlock(&exec_args_kva_mtx);
1386 exec_map_entry_size, 0);
1388 return (argkva->
addr);
1396 base = argkva->
addr;
1398 KASAN_EXEC_ARGS_FREED);
1399 if (argkva->
gen !=
gen) {
1400 (void)vm_map_madvise(exec_map, base, base + exec_map_entry_size,
1404 if (!atomic_cmpset_ptr((uintptr_t *)DPCPU_PTR(
exec_args_kva),
1405 (uintptr_t)NULL, (uintptr_t)argkva)) {
1406 mtx_lock(&exec_args_kva_mtx);
1407 SLIST_INSERT_HEAD(&exec_args_kva_freelist, argkva, next);
1409 mtx_unlock(&exec_args_kva_mtx);
1428 gen = atomic_fetchadd_int(&exec_args_gen, 1) + 1;
1435 mtx_lock(&exec_args_kva_mtx);
1437 mtx_unlock(&exec_args_kva_mtx);
1438 while ((argkva = SLIST_FIRST(&head)) != NULL) {
1439 SLIST_REMOVE_HEAD(&head, next);
1444 argkva = (
void *)atomic_readandclear_ptr(
1451 EVENTHANDLER_PRI_ANY);
1469 if (args->buf != NULL) {
1473 if (args->fname_buf != NULL) {
1474 free(args->fname_buf, M_TEMP);
1475 args->fname_buf = NULL;
1495 enum uio_seg segflg)
1500 KASSERT(args->fname == NULL, (
"fname already appended"));
1501 KASSERT(args->endp == NULL, (
"already appending to args"));
1503 if (fname != NULL) {
1504 args->fname = args->buf;
1505 error = segflg == UIO_SYSSPACE ?
1506 copystr(fname, args->fname, PATH_MAX, &length) :
1507 copyinstr(fname, args->fname, PATH_MAX, &length);
1509 return (error == ENAMETOOLONG ? E2BIG : error);
1514 args->endp = args->buf + length;
1516 args->begin_argv = args->endp;
1517 KASSERT(exec_map_entry_size - length >= ARG_MAX,
1518 (
"too little space remaining for arguments %zu < %zu",
1519 exec_map_entry_size - length, (
size_t)ARG_MAX));
1520 args->stringspace = ARG_MAX;
1527 enum uio_seg segflg,
int *countp)
1532 KASSERT(args->endp != NULL, (
"endp not initialized"));
1533 KASSERT(args->begin_argv != NULL, (
"begin_argp not initialized"));
1535 error = (segflg == UIO_SYSSPACE) ?
1536 copystr(str, args->endp, args->stringspace, &length) :
1537 copyinstr(str, args->endp, args->stringspace, &length);
1539 return (error == ENAMETOOLONG ? E2BIG : error);
1540 args->stringspace -= length;
1541 args->endp += length;
1549 enum uio_seg segflg)
1552 KASSERT(args->envc == 0, (
"appending args after env"));
1559 enum uio_seg segflg)
1562 if (args->envc == 0)
1563 args->begin_envv = args->endp;
1573 KASSERT(args->endp != NULL, (
"endp not initialized"));
1574 KASSERT(args->begin_argv != NULL, (
"begin_argp not initialized"));
1576 offset = extend - consume;
1577 if (args->stringspace < offset)
1579 memmove(args->begin_argv + extend, args->begin_argv + consume,
1580 args->endp - args->begin_argv + consume);
1582 args->begin_envv += offset;
1583 args->endp += offset;
1584 args->stringspace -= offset;
1592 KASSERT(args->endp != NULL, (
"endp not initialized"));
1595 return (args->begin_envv);
1596 return (args->endp);
1610 uintptr_t destp, ustringp;
1611 struct ps_strings *arginfo;
1613 struct sysentvec *
sysent;
1614 size_t execpath_len;
1615 int error, szsigcode;
1616 char canary[
sizeof(long) * 8];
1621 destp = PROC_PS_STRINGS(p);
1622 arginfo = imgp->ps_strings = (
void *)destp;
1627 if (
sysent->sv_sigcode_base == 0 &&
sysent->sv_szsigcode != NULL) {
1628 szsigcode = *(
sysent->sv_szsigcode);
1630 destp = rounddown2(destp,
sizeof(
void *));
1631 error = copyout(
sysent->sv_sigcode, (
void *)destp, szsigcode);
1639 if (imgp->execpath != NULL && imgp->auxargs != NULL) {
1640 execpath_len = strlen(imgp->execpath) + 1;
1641 destp -= execpath_len;
1642 destp = rounddown2(destp,
sizeof(
void *));
1643 imgp->execpathp = (
void *)destp;
1644 error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
1652 arc4rand(canary,
sizeof(canary), 0);
1653 destp -=
sizeof(canary);
1654 imgp->canary = (
void *)destp;
1655 error = copyout(canary, imgp->canary,
sizeof(canary));
1658 imgp->canarylen =
sizeof(canary);
1663 imgp->pagesizeslen =
sizeof(
pagesizes[0]) * MAXPAGESIZES;
1664 destp -= imgp->pagesizeslen;
1665 destp = rounddown2(destp,
sizeof(
void *));
1666 imgp->pagesizes = (
void *)destp;
1667 error = copyout(
pagesizes, imgp->pagesizes, imgp->pagesizeslen);
1674 destp -= ARG_MAX - imgp->args->stringspace;
1675 destp = rounddown2(destp,
sizeof(
void *));
1678 if (imgp->auxargs) {
1683 destp -= AT_COUNT *
sizeof(Elf_Auxinfo);
1684 destp = rounddown2(destp,
sizeof(
void *));
1687 vectp = (
char **)destp;
1693 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
1698 *stack_base = (uintptr_t)vectp;
1700 stringp = imgp->args->begin_argv;
1701 argc = imgp->args->argc;
1702 envc = imgp->args->envc;
1707 error = copyout(stringp, (
void *)ustringp,
1708 ARG_MAX - imgp->args->stringspace);
1716 if (suword(&arginfo->ps_argvstr, (
long)(intptr_t)vectp) != 0 ||
1717 suword32(&arginfo->ps_nargvstr, argc) != 0)
1723 for (; argc > 0; --argc) {
1724 if (suword(vectp++, ustringp) != 0)
1726 while (*stringp++ != 0)
1732 if (suword(vectp++, 0) != 0)
1736 if (suword(&arginfo->ps_envstr, (
long)(intptr_t)vectp) != 0 ||
1737 suword32(&arginfo->ps_nenvstr, envc) != 0)
1743 for (; envc > 0; --envc) {
1744 if (suword(vectp++, ustringp) != 0)
1746 while (*stringp++ != 0)
1752 if (suword(vectp, 0) != 0)
1755 if (imgp->auxargs) {
1757 error = imgp->sysent->sv_copyout_auxargs(imgp,
1774 struct vnode *vp = imgp->vp;
1775 struct vattr *attr = imgp->attr;
1782 error = VOP_GETATTR(vp, attr, td->td_ucred);
1787 error = mac_vnode_check_exec(td->td_ucred, imgp->vp, imgp);
1800 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
1801 (attr->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0 ||
1802 (attr->va_type != VREG))
1808 if (attr->va_size == 0)
1814 error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
1828 error = VOP_SET_TEXT(vp);
1831 imgp->textset =
true;
1837 error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
1839 imgp->opened =
true;
1849 const struct execsw **es, **xs, **newexecsw;
1853 for (es =
execsw; *es; es++)
1855 newexecsw =
malloc(
count *
sizeof(*es), M_TEMP, M_WAITOK);
1858 for (es =
execsw; *es; es++)
1871 const struct execsw **es, **xs, **newexecsw;
1875 panic(
"unregister with no handlers left?\n");
1877 for (es =
execsw; *es; es++) {
1878 if (*es == execsw_arg)
1883 for (es =
execsw; *es; es++)
1884 if (*es != execsw_arg)
1886 newexecsw =
malloc(
count *
sizeof(*es), M_TEMP, M_WAITOK);
1888 for (es =
execsw; *es; es++)
1889 if (*es != execsw_arg)
1908 chunk_len = MIN(len, CORE_BUF_SIZE);
1914 error = copyin(base,
buf, chunk_len);
1916 bzero(
buf, chunk_len);
1927core_write(
struct coredump_params *cp,
const void *base,
size_t len,
1928 off_t offset,
enum uio_seg seg,
size_t *resid)
1932 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1933 cp->active_cred, cp->file_cred, resid, cp->td));
1937core_output(
char *base,
size_t len, off_t offset,
struct coredump_params *cp,
1942 size_t resid, runlen;
1946 KASSERT((uintptr_t)base % PAGE_SIZE == 0,
1947 (
"%s: user address %p is not page-aligned", __func__, base));
1949 if (cp->comp != NULL)
1952 map = &cp->td->td_proc->p_vmspace->vm_map;
1953 for (; len > 0; base += runlen, offset += runlen, len -= runlen) {
1960 for (runlen = 0; runlen < len; runlen += PAGE_SIZE) {
1963 error = vm_fault(map, (uintptr_t)base + runlen,
1964 VM_PROT_READ, VM_FAULT_NOFILL, NULL);
1966 success = error == KERN_SUCCESS;
1967 else if ((error == KERN_SUCCESS) != success)
1973 UIO_USERSPACE, &resid);
1975 if (error != EFAULT)
1998 vn_lock(cp->vp, LK_EXCLUSIVE | LK_RETRY);
2000 false, cp->td->td_ucred);
2016 struct coredump_params *cp;
2021 p = cp->td->td_proc;
2031 locked = PROC_LOCKED(p);
2034 if (cp->comp != NULL)
2039 UIO_SYSSPACE, NULL);
void stopprofclock(struct proc *p)
int fdcheckstd(struct thread *td)
void pdunshare(struct thread *td)
void fdunshare(struct thread *td)
int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp, struct vnode **vpp)
void fdsetugidsafety(struct thread *td)
void fdcloseexec(struct thread *td)
void exec_onexec_old(struct thread *td)
int exec_new_vmspace(struct image_params *imgp, struct sysentvec *sv)
int coredump_pack_vmmapinfo
static void execve_nosetid(struct image_params *imgp)
SYSINIT(exec_args_kva, SI_SUB_EXEC, SI_ORDER_ANY, exec_prealloc_args_kva, NULL)
SDT_PROBE_DEFINE1(proc,,, exec, "char *")
EVENTHANDLER_DEFINE(vm_lowmem, exec_args_kva_lowmem, NULL, EVENTHANDLER_PRI_ANY)
void exec_free_args(struct image_args *args)
int coredump_pack_fileinfo
void exec_unmap_first_page(struct image_params *imgp)
int exec_register(const struct execsw *execsw_arg)
static void exec_free_args_kva(void *cookie)
static int disallow_high_osrel
void exec_cleanup(struct thread *td, struct vmspace *oldvmspace)
static const struct execsw ** execsw
int exec_check_permissions(struct image_params *imgp)
int exec_map_stack(struct image_params *imgp)
SYSCTL_ULONG(_kern, OID_AUTO, ps_arg_cache_limit, CTLFLAG_RW, &ps_arg_cache_limit, 0, "Process' command line characters cache limit")
DPCPU_DEFINE_STATIC(struct exec_args_kva *, exec_args_kva)
SYSCTL_PROC(_kern, KERN_PS_STRINGS, ps_strings, CTLTYPE_ULONG|CTLFLAG_RD|CTLFLAG_CAPRD|CTLFLAG_MPSAFE, NULL, 0, sysctl_kern_ps_strings, "LU", "Location of process' ps_strings structure")
static int sysctl_kern_stackprot(SYSCTL_HANDLER_ARGS)
static int do_execve(struct thread *td, struct image_args *args, struct mac *mac_p, struct vmspace *oldvmspace)
int exec_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
int sys_fexecve(struct thread *td, struct fexecve_args *uap)
static vm_offset_t exec_alloc_args_kva(void **cookie)
static void exec_release_args_kva(struct exec_args_kva *argkva, u_int gen)
void exec_free_abi_mappings(struct proc *p)
int kern_execve(struct thread *td, struct image_args *args, struct mac *mac_p, struct vmspace *oldvmspace)
int exec_map_first_page(struct image_params *imgp)
static int compress_chunk(struct coredump_params *cp, char *base, char *buf, size_t len)
static int sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS)
u_long ps_arg_cache_limit
int exec_args_adjust_args(struct image_args *args, size_t consume, ssize_t extend)
static int core_dump_can_intr
int sbuf_drain_core_output(void *arg, const char *data, int len)
static void exec_args_kva_lowmem(void *arg __unused)
int exec_args_add_arg(struct image_args *args, const char *argp, enum uio_seg segflg)
static SLIST_HEAD(exec_args_kva)
char * exec_args_get_begin_envv(struct image_args *args)
MALLOC_DEFINE(M_PARGS, "proc-args", "Process arguments")
int exec_args_add_fname(struct image_args *args, const char *fname, enum uio_seg segflg)
int exec_args_add_env(struct image_args *args, const char *envp, enum uio_seg segflg)
int sys_execve(struct thread *td, struct execve_args *uap)
SYSCTL_INT(_kern, OID_AUTO, coredump_pack_fileinfo, CTLFLAG_RWTUN, &coredump_pack_fileinfo, 0, "Enable file path packing in 'procstat -f' coredump notes")
void post_execve(struct thread *td, int error, struct vmspace *oldvmspace)
SDT_PROVIDER_DECLARE(proc)
int exec_copyin_args(struct image_args *args, const char *fname, enum uio_seg segflg, char **argv, char **envv)
int sys___mac_execve(struct thread *td, struct __mac_execve_args *uap)
int exec_unregister(const struct execsw *execsw_arg)
int pre_execve(struct thread *td, struct vmspace **oldvmspace)
int core_output(char *base, size_t len, off_t offset, struct coredump_params *cp, void *tmpbuf)
static int sysctl_kern_ps_strings(SYSCTL_HANDLER_ARGS)
int exec_alloc_args(struct image_args *args)
int core_write(struct coredump_params *cp, const void *base, size_t len, off_t offset, enum uio_seg seg, size_t *resid)
static int exec_args_add_str(struct image_args *args, const char *str, enum uio_seg segflg, int *countp)
void exit1(struct thread *td, int rval, int signo)
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
void free(void *addr, struct malloc_type *mtp)
u_long pagesizes[MAXPAGESIZES]
struct pargs * pargs_alloc(int len)
void pargs_drop(struct pargs *pa)
struct ucred * crdup(struct ucred *cr)
void setsugid(struct proc *p)
void change_egid(struct ucred *newcred, gid_t egid)
void change_euid(struct ucred *newcred, struct uidinfo *euip)
void change_svuid(struct ucred *newcred, uid_t svuid)
void change_svgid(struct ucred *newcred, gid_t svgid)
void proc_set_cred(struct proc *p, struct ucred *newcred)
void crfree(struct ucred *cr)
void uifree(struct uidinfo *uip)
rlim_t lim_max(struct thread *td, int which)
int kern_setrlimit(struct thread *td, u_int which, struct rlimit *limp)
struct uidinfo * uifind(uid_t uid)
void lim_rlimit_proc(struct proc *p, int which, struct rlimit *rlp)
void panic(const char *fmt,...)
void signotify(struct thread *td)
int sigacts_shared(struct sigacts *ps)
void sigfastblock_clear(struct thread *td)
struct sigacts * sigacts_alloc(void)
void sigacts_copy(struct sigacts *dest, struct sigacts *src)
void sigacts_free(struct sigacts *ps)
bool curproc_sigkilled(void)
void execsigs(struct proc *p)
void wakeup_one(const void *ident)
void thread_single_end(struct proc *p, int mode)
int thread_single(struct proc *p, int mode)
void itimers_exec(struct proc *p)
void umtx_exec(struct proc *p)
void kasan_mark(const void *addr, size_t size, size_t redzsize, uint8_t code)
__read_mostly cap_rights_t cap_fexecve_rights
int compressor_write(struct compressor *stream, void *data, size_t len)
int uprintf(const char *fmt,...)
struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags)
void sf_buf_free(struct sf_buf *sf)
void shmexit(struct vmspace *vm)
int vn_commname(struct vnode *vp, char *buf, u_int buflen)
int vn_fullpath(struct vnode *vp, char **retbuf, char **freebuf)
int vn_fullpath_hardlink(struct vnode *vp, struct vnode *dvp, const char *hrdl_name, size_t hrdl_name_length, char **retbuf, char **freebuf, size_t *buflen)
void() NDFREE(struct nameidata *ndp, const u_int flags)
int namei(struct nameidata *ndp)
void vrele(struct vnode *vp)
void vput(struct vnode *vp)
int vn_start_write(struct vnode *vp, struct mount **mpp, int flags)
int vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, void *base, size_t len, off_t offset, enum uio_seg segflg, int ioflg, struct ucred *active_cred, struct ucred *file_cred, size_t *aresid, struct thread *td)
void vn_finished_write(struct mount *mp)
int vn_truncate_locked(struct vnode *vp, off_t length, bool sync, struct ucred *cred)