Lines Matching +full:protect +full:- +full:exec
1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/exec.c
9 * #!-checking implemented by tytso.
12 * Demand-loading implemented 01.12.91 - no need to read anything but
14 * "current->executable", and page faults do the actual loading. Clean.
17 * was less than 2 hours work to get demand-loading completely implemented.
20 * current->executable is only used by the procfs. This allows a dispatch
89 insert ? list_add(&fmt->lh, &formats) : in __register_binfmt()
90 list_add_tail(&fmt->lh, &formats); in __register_binfmt()
99 list_del(&fmt->lh); in unregister_binfmt()
107 module_put(fmt->module); in put_binfmt()
112 return (path->mnt->mnt_flags & MNT_NOEXEC) || in path_noexec()
113 (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC); in path_noexec()
148 error = -EACCES; in SYSCALL_DEFINE1()
149 if (WARN_ON_ONCE(!S_ISREG(file_inode(file)->i_mode)) || in SYSCALL_DEFINE1()
150 path_noexec(&file->f_path)) in SYSCALL_DEFINE1()
153 error = -ENOEXEC; in SYSCALL_DEFINE1()
157 if (!fmt->load_shlib) in SYSCALL_DEFINE1()
159 if (!try_module_get(fmt->module)) in SYSCALL_DEFINE1()
162 error = fmt->load_shlib(file); in SYSCALL_DEFINE1()
165 if (error != -ENOEXEC) in SYSCALL_DEFINE1()
178 * The nascent bprm->mm is not visible until exec_mmap() but it can
179 * use a lot of memory, account these pages in current->mm temporary
180 * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we
185 struct mm_struct *mm = current->mm; in acct_arg_size()
186 long diff = (long)(pages - bprm->vma_pages); in acct_arg_size()
191 bprm->vma_pages = pages; in acct_arg_size()
199 struct vm_area_struct *vma = bprm->vma; in get_arg_page()
200 struct mm_struct *mm = bprm->mm; in get_arg_page()
208 if (write && pos < vma->vm_start) { in get_arg_page()
220 * We are doing an exec(). 'current' is the process in get_arg_page()
221 * doing the exec and 'mm' is the new process's mm. in get_arg_page()
248 flush_cache_page(bprm->vma, pos, page_to_pfn(page)); in flush_arg_page()
255 struct mm_struct *mm = bprm->mm; in __bprm_mm_init()
257 bprm->vma = vma = vm_area_alloc(mm); in __bprm_mm_init()
259 return -ENOMEM; in __bprm_mm_init()
263 err = -EINTR; in __bprm_mm_init()
274 vma->vm_end = STACK_TOP_MAX; in __bprm_mm_init()
275 vma->vm_start = vma->vm_end - PAGE_SIZE; in __bprm_mm_init()
277 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); in __bprm_mm_init()
283 mm->stack_vm = mm->total_vm = 1; in __bprm_mm_init()
285 bprm->p = vma->vm_end - sizeof(void *); in __bprm_mm_init()
290 bprm->vma = NULL; in __bprm_mm_init()
311 page = bprm->page[pos / PAGE_SIZE]; in get_arg_page()
316 bprm->page[pos / PAGE_SIZE] = page; in get_arg_page()
328 if (bprm->page[i]) { in free_arg_page()
329 __free_page(bprm->page[i]); in free_arg_page()
330 bprm->page[i] = NULL; in free_arg_page()
349 bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *); in __bprm_mm_init()
355 return len <= bprm->p; in valid_arg_len()
371 bprm->mm = mm = mm_alloc(); in bprm_mm_init()
372 err = -ENOMEM; in bprm_mm_init()
376 /* Save current stack limit for all calculations made during exec. */ in bprm_mm_init()
377 task_lock(current->group_leader); in bprm_mm_init()
378 bprm->rlim_stack = current->signal->rlim[RLIMIT_STACK]; in bprm_mm_init()
379 task_unlock(current->group_leader); in bprm_mm_init()
389 bprm->mm = NULL; in bprm_mm_init()
417 return ERR_PTR(-EFAULT); in get_user_arg_ptr()
424 return ERR_PTR(-EFAULT); in get_user_arg_ptr()
444 return -EFAULT; in count()
447 return -E2BIG; in count()
451 return -ERESTARTNOHAND; in count()
467 return -E2BIG; in count_strings_kernel()
469 return -ERESTARTNOHAND; in count_strings_kernel()
483 * - the remaining binfmt code will not run out of stack space, in bprm_stack_limits()
484 * - the program will have a reasonable amount of stack left in bprm_stack_limits()
488 limit = min(limit, bprm->rlim_stack.rlim_cur / 4); in bprm_stack_limits()
507 ptr_size = (max(bprm->argc, 1) + bprm->envc) * sizeof(void *); in bprm_stack_limits()
509 return -E2BIG; in bprm_stack_limits()
510 limit -= ptr_size; in bprm_stack_limits()
512 bprm->argmin = bprm->p - limit; in bprm_stack_limits()
529 while (argc-- > 0) { in copy_strings()
534 ret = -EFAULT; in copy_strings()
543 ret = -E2BIG; in copy_strings()
548 pos = bprm->p; in copy_strings()
550 bprm->p -= len; in copy_strings()
552 if (bprm->p < bprm->argmin) in copy_strings()
560 ret = -ERESTARTNOHAND; in copy_strings()
573 offset -= bytes_to_copy; in copy_strings()
574 pos -= bytes_to_copy; in copy_strings()
575 str -= bytes_to_copy; in copy_strings()
576 len -= bytes_to_copy; in copy_strings()
583 ret = -E2BIG; in copy_strings()
598 ret = -EFAULT; in copy_strings()
619 unsigned long pos = bprm->p; in copy_string_kernel()
622 return -EFAULT; in copy_string_kernel()
624 return -E2BIG; in copy_string_kernel()
628 bprm->p -= len; in copy_string_kernel()
629 if (IS_ENABLED(CONFIG_MMU) && bprm->p < bprm->argmin) in copy_string_kernel()
630 return -E2BIG; in copy_string_kernel()
637 pos -= bytes_to_copy; in copy_string_kernel()
638 arg -= bytes_to_copy; in copy_string_kernel()
639 len -= bytes_to_copy; in copy_string_kernel()
643 return -E2BIG; in copy_string_kernel()
656 while (argc-- > 0) { in copy_strings_kernel()
661 return -ERESTARTNOHAND; in copy_strings_kernel()
683 struct mm_struct *mm = vma->vm_mm; in shift_arg_pages()
684 unsigned long old_start = vma->vm_start; in shift_arg_pages()
685 unsigned long old_end = vma->vm_end; in shift_arg_pages()
686 unsigned long length = old_end - old_start; in shift_arg_pages()
687 unsigned long new_start = old_start - shift; in shift_arg_pages()
688 unsigned long new_end = old_end - shift; in shift_arg_pages()
700 return -EFAULT; in shift_arg_pages()
706 if (vma_expand(&vmi, vma, new_start, old_end, vma->vm_pgoff, NULL)) in shift_arg_pages()
707 return -ENOMEM; in shift_arg_pages()
715 return -ENOMEM; in shift_arg_pages()
725 next ? next->vm_start : USER_PGTABLES_CEILING); in shift_arg_pages()
730 * have constraints on va-space that make this illegal (IA64) - in shift_arg_pages()
734 next ? next->vm_start : USER_PGTABLES_CEILING); in shift_arg_pages()
740 return vma_shrink(&vmi, vma, new_start, new_end, vma->vm_pgoff); in shift_arg_pages()
753 struct mm_struct *mm = current->mm; in setup_arg_pages()
754 struct vm_area_struct *vma = bprm->vma; in setup_arg_pages()
766 stack_base = bprm->rlim_stack.rlim_max; in setup_arg_pages()
771 if (current->flags & PF_RANDOMIZE) in setup_arg_pages()
775 if (vma->vm_end - vma->vm_start > stack_base) in setup_arg_pages()
776 return -ENOMEM; in setup_arg_pages()
778 stack_base = PAGE_ALIGN(stack_top - stack_base); in setup_arg_pages()
780 stack_shift = vma->vm_start - stack_base; in setup_arg_pages()
781 mm->arg_start = bprm->p - stack_shift; in setup_arg_pages()
782 bprm->p = vma->vm_end - stack_shift; in setup_arg_pages()
788 unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr)) in setup_arg_pages()
789 return -ENOMEM; in setup_arg_pages()
791 stack_shift = vma->vm_end - stack_top; in setup_arg_pages()
793 bprm->p -= stack_shift; in setup_arg_pages()
794 mm->arg_start = bprm->p; in setup_arg_pages()
797 if (bprm->loader) in setup_arg_pages()
798 bprm->loader -= stack_shift; in setup_arg_pages()
799 bprm->exec -= stack_shift; in setup_arg_pages()
802 return -EINTR; in setup_arg_pages()
815 vm_flags |= mm->def_flags; in setup_arg_pages()
818 vma_iter_init(&vmi, mm, vma->vm_start); in setup_arg_pages()
821 ret = mprotect_fixup(&vmi, &tlb, vma, &prev, vma->vm_start, vma->vm_end, in setup_arg_pages()
831 bprm->file); in setup_arg_pages()
845 stack_size = vma->vm_end - vma->vm_start; in setup_arg_pages()
850 rlim_stack = bprm->rlim_stack.rlim_cur & PAGE_MASK; in setup_arg_pages()
855 stack_base = vma->vm_start + stack_expand; in setup_arg_pages()
857 stack_base = vma->vm_end - stack_expand; in setup_arg_pages()
859 current->mm->start_stack = bprm->p; in setup_arg_pages()
862 ret = -EFAULT; in setup_arg_pages()
882 stop = bprm->p >> PAGE_SHIFT; in transfer_args_to_stack()
885 for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { in transfer_args_to_stack()
886 unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0; in transfer_args_to_stack()
887 char *src = kmap_local_page(bprm->page[index]) + offset; in transfer_args_to_stack()
888 sp -= PAGE_SIZE - offset; in transfer_args_to_stack()
889 if (copy_to_user((void *) sp, src, PAGE_SIZE - offset) != 0) in transfer_args_to_stack()
890 ret = -EFAULT; in transfer_args_to_stack()
896 bprm->exec += *sp_location - MAX_ARG_PAGES * PAGE_SIZE; in transfer_args_to_stack()
918 return ERR_PTR(-EINVAL); in do_open_execat()
930 * 633fb6ac3980 ("exec: move S_ISREG() check earlier"). Since then it is in do_open_execat()
931 * an invariant that all non-regular files error out before we get here. in do_open_execat()
933 err = -EACCES; in do_open_execat()
934 if (WARN_ON_ONCE(!S_ISREG(file_inode(file)->i_mode)) || in do_open_execat()
935 path_noexec(&file->f_path)) in do_open_execat()
986 old_mm = current->mm; in exec_mmap()
991 ret = down_write_killable(&tsk->signal->exec_update_lock); in exec_mmap()
999 * out and die instead of going through with the exec. in exec_mmap()
1003 up_write(&tsk->signal->exec_update_lock); in exec_mmap()
1012 active_mm = tsk->active_mm; in exec_mmap()
1013 tsk->active_mm = mm; in exec_mmap()
1014 tsk->mm = mm; in exec_mmap()
1034 setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm); in exec_mmap()
1045 struct signal_struct *sig = tsk->signal; in de_thread()
1046 struct sighand_struct *oldsighand = tsk->sighand; in de_thread()
1047 spinlock_t *lock = &oldsighand->siglock; in de_thread()
1056 if ((sig->flags & SIGNAL_GROUP_EXIT) || sig->group_exec_task) { in de_thread()
1062 return -EAGAIN; in de_thread()
1065 sig->group_exec_task = tsk; in de_thread()
1066 sig->notify_count = zap_other_threads(tsk); in de_thread()
1068 sig->notify_count--; in de_thread()
1070 while (sig->notify_count) { in de_thread()
1086 struct task_struct *leader = tsk->group_leader; in de_thread()
1093 * exit_notify() can't miss ->group_exec_task in de_thread()
1095 sig->notify_count = -1; in de_thread()
1096 if (likely(leader->exit_state)) in de_thread()
1107 * The only record we have of the real-time age of a in de_thread()
1110 * from sister threads now dead. But in this non-leader in de_thread()
1111 * exec, nothing survives from the original leader thread, in de_thread()
1116 tsk->start_time = leader->start_time; in de_thread()
1117 tsk->start_boottime = leader->start_boottime; in de_thread()
1121 * An exec() starts a new thread group with the in de_thread()
1135 list_replace_rcu(&leader->tasks, &tsk->tasks); in de_thread()
1136 list_replace_init(&leader->sibling, &tsk->sibling); in de_thread()
1138 tsk->group_leader = tsk; in de_thread()
1139 leader->group_leader = tsk; in de_thread()
1141 tsk->exit_signal = SIGCHLD; in de_thread()
1142 leader->exit_signal = -1; in de_thread()
1144 BUG_ON(leader->exit_state != EXIT_ZOMBIE); in de_thread()
1145 leader->exit_state = EXIT_DEAD; in de_thread()
1148 * We are going to release_task()->ptrace_unlink() silently, in de_thread()
1152 if (unlikely(leader->ptrace)) in de_thread()
1153 __wake_up_parent(leader, leader->parent); in de_thread()
1160 sig->group_exec_task = NULL; in de_thread()
1161 sig->notify_count = 0; in de_thread()
1165 tsk->exit_signal = SIGCHLD; in de_thread()
1173 sig->group_exec_task = NULL; in de_thread()
1174 sig->notify_count = 0; in de_thread()
1176 return -EAGAIN; in de_thread()
1188 struct sighand_struct *oldsighand = me->sighand; in unshare_sighand()
1190 if (refcount_read(&oldsighand->count) != 1) { in unshare_sighand()
1193 * This ->sighand is shared with the CLONE_SIGHAND in unshare_sighand()
1198 return -ENOMEM; in unshare_sighand()
1200 refcount_set(&newsighand->count, 1); in unshare_sighand()
1203 spin_lock(&oldsighand->siglock); in unshare_sighand()
1204 memcpy(newsighand->action, oldsighand->action, in unshare_sighand()
1205 sizeof(newsighand->action)); in unshare_sighand()
1206 rcu_assign_pointer(me->sighand, newsighand); in unshare_sighand()
1207 spin_unlock(&oldsighand->siglock); in unshare_sighand()
1218 /* Always NUL terminated and zero-padded */ in __get_task_comm()
1219 strscpy_pad(buf, tsk->comm, buf_size); in __get_task_comm()
1230 void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec) in __set_task_comm() argument
1234 strscpy_pad(tsk->comm, buf, sizeof(tsk->comm)); in __set_task_comm()
1236 perf_event_comm(tsk, exec); in __set_task_comm()
1258 bprm->point_of_no_return = true; in begin_new_exec()
1278 * Must be called _before_ exec_mmap() as bprm->mm is in begin_new_exec()
1282 retval = set_mm_exe_file(bprm->mm, bprm->file); in begin_new_exec()
1286 /* If the binary is not readable then enforce mm->dumpable=0 */ in begin_new_exec()
1287 would_dump(bprm, bprm->file); in begin_new_exec()
1288 if (bprm->have_execfd) in begin_new_exec()
1289 would_dump(bprm, bprm->executable); in begin_new_exec()
1295 retval = exec_mmap(bprm->mm); in begin_new_exec()
1299 bprm->mm = NULL; in begin_new_exec()
1306 spin_lock_irq(&me->sighand->siglock); in begin_new_exec()
1308 spin_unlock_irq(&me->sighand->siglock); in begin_new_exec()
1320 me->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | in begin_new_exec()
1323 me->personality &= ~bprm->per_clear; in begin_new_exec()
1330 * trying to access the should-be-closed file descriptors of a process in begin_new_exec()
1331 * undergoing exec(2). in begin_new_exec()
1333 do_close_on_exec(me->files); in begin_new_exec()
1335 if (bprm->secureexec) { in begin_new_exec()
1337 me->pdeath_signal = 0; in begin_new_exec()
1346 if (bprm->rlim_stack.rlim_cur > _STK_LIM) in begin_new_exec()
1347 bprm->rlim_stack.rlim_cur = _STK_LIM; in begin_new_exec()
1350 me->sas_ss_sp = me->sas_ss_size = 0; in begin_new_exec()
1355 * bprm->secureexec instead. in begin_new_exec()
1357 if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP || in begin_new_exec()
1360 set_dumpable(current->mm, suid_dumpable); in begin_new_exec()
1362 set_dumpable(current->mm, SUID_DUMP_USER); in begin_new_exec()
1371 if (bprm->comm_from_dentry) { in begin_new_exec()
1381 __set_task_comm(me, smp_load_acquire(&bprm->file->f_path.dentry->d_name.name), in begin_new_exec()
1385 __set_task_comm(me, kbasename(bprm->filename), true); in begin_new_exec()
1388 /* An exec changes our domain. We are no longer part of the thread in begin_new_exec()
1390 WRITE_ONCE(me->self_exec_id, me->self_exec_id + 1); in begin_new_exec()
1393 retval = set_cred_ucounts(bprm->cred); in begin_new_exec()
1402 commit_creds(bprm->cred); in begin_new_exec()
1403 bprm->cred = NULL; in begin_new_exec()
1411 if (get_dumpable(me->mm) != SUID_DUMP_USER) in begin_new_exec()
1421 if (bprm->have_execfd) { in begin_new_exec()
1425 fd_install(retval, bprm->executable); in begin_new_exec()
1426 bprm->executable = NULL; in begin_new_exec()
1427 bprm->execfd = retval; in begin_new_exec()
1432 up_write(&me->signal->exec_update_lock); in begin_new_exec()
1433 if (!bprm->cred) in begin_new_exec()
1434 mutex_unlock(&me->signal->cred_guard_mutex); in begin_new_exec()
1447 bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; in would_dump()
1449 /* Ensure mm->user_ns contains the executable */ in would_dump()
1450 user_ns = old = bprm->mm->user_ns; in would_dump()
1453 user_ns = user_ns->parent; in would_dump()
1456 bprm->mm->user_ns = get_user_ns(user_ns); in would_dump()
1468 arch_pick_mmap_layout(me->mm, &bprm->rlim_stack); in setup_new_exec()
1476 me->mm->task_size = TASK_SIZE; in setup_new_exec()
1477 up_write(&me->signal->exec_update_lock); in setup_new_exec()
1478 mutex_unlock(&me->signal->cred_guard_mutex); in setup_new_exec()
1486 task_lock(current->group_leader); in finalize_exec()
1487 current->signal->rlim[RLIMIT_STACK] = bprm->rlim_stack; in finalize_exec()
1488 task_unlock(current->group_leader); in finalize_exec()
1493 * Prepare credentials and lock ->cred_guard_mutex.
1495 * Or, if exec fails before, free_bprm() should release ->cred
1500 if (mutex_lock_interruptible(¤t->signal->cred_guard_mutex)) in prepare_bprm_creds()
1501 return -ERESTARTNOINTR; in prepare_bprm_creds()
1503 bprm->cred = prepare_exec_creds(); in prepare_bprm_creds()
1504 if (likely(bprm->cred)) in prepare_bprm_creds()
1507 mutex_unlock(¤t->signal->cred_guard_mutex); in prepare_bprm_creds()
1508 return -ENOMEM; in prepare_bprm_creds()
1513 if (bprm->mm) { in free_bprm()
1515 mmput(bprm->mm); in free_bprm()
1518 if (bprm->cred) { in free_bprm()
1519 mutex_unlock(¤t->signal->cred_guard_mutex); in free_bprm()
1520 abort_creds(bprm->cred); in free_bprm()
1522 if (bprm->file) { in free_bprm()
1523 allow_write_access(bprm->file); in free_bprm()
1524 fput(bprm->file); in free_bprm()
1526 if (bprm->executable) in free_bprm()
1527 fput(bprm->executable); in free_bprm()
1529 if (bprm->interp != bprm->filename) in free_bprm()
1530 kfree(bprm->interp); in free_bprm()
1531 kfree(bprm->fdpath); in free_bprm()
1538 int retval = -ENOMEM; in alloc_bprm()
1542 if (fd == AT_FDCWD || filename->name[0] == '/') { in alloc_bprm()
1543 bprm->filename = filename->name; in alloc_bprm()
1545 if (filename->name[0] == '\0') { in alloc_bprm()
1546 bprm->fdpath = kasprintf(GFP_KERNEL, "/dev/fd/%d", fd); in alloc_bprm()
1547 bprm->comm_from_dentry = 1; in alloc_bprm()
1549 bprm->fdpath = kasprintf(GFP_KERNEL, "/dev/fd/%d/%s", in alloc_bprm()
1550 fd, filename->name); in alloc_bprm()
1552 if (!bprm->fdpath) in alloc_bprm()
1555 bprm->filename = bprm->fdpath; in alloc_bprm()
1557 bprm->interp = bprm->filename; in alloc_bprm()
1573 if (bprm->interp != bprm->filename) in bprm_change_interp()
1574 kfree(bprm->interp); in bprm_change_interp()
1575 bprm->interp = kstrdup(interp, GFP_KERNEL); in bprm_change_interp()
1576 if (!bprm->interp) in bprm_change_interp()
1577 return -ENOMEM; in bprm_change_interp()
1584 * - the caller must hold ->cred_guard_mutex to protect against
1585 * PTRACE_ATTACH or seccomp thread-sync
1592 if (p->ptrace) in check_unsafe_exec()
1593 bprm->unsafe |= LSM_UNSAFE_PTRACE; in check_unsafe_exec()
1600 bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS; in check_unsafe_exec()
1604 * suid exec because the differently privileged task in check_unsafe_exec()
1610 spin_lock(&p->fs->lock); in check_unsafe_exec()
1613 if (t->fs == p->fs) in check_unsafe_exec()
1618 if (p->fs->users > n_fs) in check_unsafe_exec()
1619 bprm->unsafe |= LSM_UNSAFE_SHARE; in check_unsafe_exec()
1621 p->fs->in_exec = 1; in check_unsafe_exec()
1622 spin_unlock(&p->fs->lock); in check_unsafe_exec()
1635 if (!mnt_may_suid(file->f_path.mnt)) in bprm_fill_uid()
1641 mode = READ_ONCE(inode->i_mode); in bprm_fill_uid()
1651 mode = inode->i_mode; in bprm_fill_uid()
1657 /* Did the exec bit vanish out from under us? Give up. */ in bprm_fill_uid()
1662 if (!vfsuid_has_mapping(bprm->cred->user_ns, vfsuid) || in bprm_fill_uid()
1663 !vfsgid_has_mapping(bprm->cred->user_ns, vfsgid)) in bprm_fill_uid()
1667 bprm->per_clear |= PER_CLEAR_ON_SETID; in bprm_fill_uid()
1668 bprm->cred->euid = vfsuid_into_kuid(vfsuid); in bprm_fill_uid()
1672 bprm->per_clear |= PER_CLEAR_ON_SETID; in bprm_fill_uid()
1673 bprm->cred->egid = vfsgid_into_kgid(vfsgid); in bprm_fill_uid()
1678 * Compute brpm->cred based upon the final binary.
1683 struct file *file = bprm->execfd_creds ? bprm->executable : bprm->file; in bprm_creds_from_file()
1699 memset(bprm->buf, 0, BINPRM_BUF_SIZE); in prepare_binprm()
1700 return kernel_read(bprm->file, bprm->buf, BINPRM_BUF_SIZE, &pos); in prepare_binprm()
1704 * Arguments are '\0' separated strings found at the location bprm->p
1705 * points to; chop off the first by relocating brpm->p to right after
1715 if (!bprm->argc) in remove_arg_zero()
1719 offset = bprm->p & ~PAGE_MASK; in remove_arg_zero()
1720 page = get_arg_page(bprm, bprm->p, 0); in remove_arg_zero()
1722 ret = -EFAULT; in remove_arg_zero()
1728 offset++, bprm->p++) in remove_arg_zero()
1735 bprm->p++; in remove_arg_zero()
1736 bprm->argc--; in remove_arg_zero()
1762 retval = -ENOENT; in search_binary_handler()
1766 if (!try_module_get(fmt->module)) in search_binary_handler()
1770 retval = fmt->load_binary(bprm); in search_binary_handler()
1774 if (bprm->point_of_no_return || (retval != -ENOEXEC)) { in search_binary_handler()
1782 if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && in search_binary_handler()
1783 printable(bprm->buf[2]) && printable(bprm->buf[3])) in search_binary_handler()
1785 if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) in search_binary_handler()
1801 old_pid = current->pid; in exec_binprm()
1803 old_vpid = task_pid_nr_ns(current, task_active_pid_ns(current->parent)); in exec_binprm()
1808 struct file *exec; in exec_binprm() local
1810 return -ELOOP; in exec_binprm()
1815 if (!bprm->interpreter) in exec_binprm()
1818 exec = bprm->file; in exec_binprm()
1819 bprm->file = bprm->interpreter; in exec_binprm()
1820 bprm->interpreter = NULL; in exec_binprm()
1822 allow_write_access(exec); in exec_binprm()
1823 if (unlikely(bprm->have_execfd)) { in exec_binprm()
1824 if (bprm->executable) { in exec_binprm()
1825 fput(exec); in exec_binprm()
1826 return -ENOEXEC; in exec_binprm()
1828 bprm->executable = exec; in exec_binprm()
1830 fput(exec); in exec_binprm()
1856 * where setuid-ness is evaluated. in bprm_execve()
1859 current->in_execve = 1; in bprm_execve()
1869 bprm->file = file; in bprm_execve()
1872 * inaccessible after exec. This allows the code in exec to in bprm_execve()
1879 if (bprm->fdpath && get_close_on_exec(fd)) in bprm_execve()
1880 bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE; in bprm_execve()
1882 /* Set the unchanging part of bprm->cred */ in bprm_execve()
1893 current->fs->in_exec = 0; in bprm_execve()
1894 current->in_execve = 0; in bprm_execve()
1908 if (bprm->point_of_no_return && !fatal_signal_pending(current)) in bprm_execve()
1913 current->fs->in_exec = 0; in bprm_execve()
1914 current->in_execve = 0; in bprm_execve()
1936 if ((current->flags & PF_NPROC_EXCEEDED) && in do_execveat_common()
1938 retval = -EAGAIN; in do_execveat_common()
1944 current->flags &= ~PF_NPROC_EXCEEDED; in do_execveat_common()
1955 current->comm, bprm->filename); in do_execveat_common()
1958 bprm->argc = retval; in do_execveat_common()
1963 bprm->envc = retval; in do_execveat_common()
1969 retval = copy_string_kernel(bprm->filename, bprm); in do_execveat_common()
1972 bprm->exec = bprm->p; in do_execveat_common()
1974 retval = copy_strings(bprm->envc, envp, bprm); in do_execveat_common()
1978 retval = copy_strings(bprm->argc, argv, bprm); in do_execveat_common()
1988 if (bprm->argc == 0) { in do_execveat_common()
1992 bprm->argc = 1; in do_execveat_common()
2012 /* It is non-sense for kernel threads to call execve */ in kernel_execve()
2013 if (WARN_ON_ONCE(current->flags & PF_KTHREAD)) in kernel_execve()
2014 return -EINVAL; in kernel_execve()
2028 retval = -EINVAL; in kernel_execve()
2031 bprm->argc = retval; in kernel_execve()
2036 bprm->envc = retval; in kernel_execve()
2042 retval = copy_string_kernel(bprm->filename, bprm); in kernel_execve()
2045 bprm->exec = bprm->p; in kernel_execve()
2047 retval = copy_strings_kernel(bprm->envc, envp, bprm); in kernel_execve()
2051 retval = copy_strings_kernel(bprm->argc, argv, bprm); in kernel_execve()
2118 struct mm_struct *mm = current->mm; in set_binfmt()
2120 if (mm->binfmt) in set_binfmt()
2121 module_put(mm->binfmt->module); in set_binfmt()
2123 mm->binfmt = new; in set_binfmt()
2125 __module_get(new->module); in set_binfmt()
2130 * set_dumpable stores three-value SUID_DUMP_* into mm->flags.
2137 set_mask_bits(&mm->flags, MMF_DUMPABLE_MASK, value); in set_dumpable()