Lines Matching refs:bprm
79 static int bprm_creds_from_file(struct linux_binprm *bprm);
190 static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) in acct_arg_size() argument
193 long diff = (long)(pages - bprm->vma_pages); in acct_arg_size()
198 bprm->vma_pages = pages; in acct_arg_size()
202 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, in get_arg_page() argument
211 ret = expand_downwards(bprm->vma, pos); in get_arg_page()
224 ret = get_user_pages_remote(bprm->mm, pos, 1, gup_flags, in get_arg_page()
230 acct_arg_size(bprm, vma_pages(bprm->vma)); in get_arg_page()
240 static void free_arg_pages(struct linux_binprm *bprm) in free_arg_pages() argument
244 static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, in flush_arg_page() argument
247 flush_cache_page(bprm->vma, pos, page_to_pfn(page)); in flush_arg_page()
250 static int __bprm_mm_init(struct linux_binprm *bprm) in __bprm_mm_init() argument
254 struct mm_struct *mm = bprm->mm; in __bprm_mm_init()
256 bprm->vma = vma = vm_area_alloc(mm); in __bprm_mm_init()
284 bprm->p = vma->vm_end - sizeof(void *); in __bprm_mm_init()
289 bprm->vma = NULL; in __bprm_mm_init()
294 static bool valid_arg_len(struct linux_binprm *bprm, long len) in valid_arg_len() argument
301 static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) in acct_arg_size() argument
305 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, in get_arg_page() argument
310 page = bprm->page[pos / PAGE_SIZE]; in get_arg_page()
315 bprm->page[pos / PAGE_SIZE] = page; in get_arg_page()
325 static void free_arg_page(struct linux_binprm *bprm, int i) in free_arg_page() argument
327 if (bprm->page[i]) { in free_arg_page()
328 __free_page(bprm->page[i]); in free_arg_page()
329 bprm->page[i] = NULL; in free_arg_page()
333 static void free_arg_pages(struct linux_binprm *bprm) in free_arg_pages() argument
338 free_arg_page(bprm, i); in free_arg_pages()
341 static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, in flush_arg_page() argument
346 static int __bprm_mm_init(struct linux_binprm *bprm) in __bprm_mm_init() argument
348 bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *); in __bprm_mm_init()
352 static bool valid_arg_len(struct linux_binprm *bprm, long len) in valid_arg_len() argument
354 return len <= bprm->p; in valid_arg_len()
365 static int bprm_mm_init(struct linux_binprm *bprm) in bprm_mm_init() argument
370 bprm->mm = mm = mm_alloc(); in bprm_mm_init()
377 bprm->rlim_stack = current->signal->rlim[RLIMIT_STACK]; in bprm_mm_init()
380 err = __bprm_mm_init(bprm); in bprm_mm_init()
388 bprm->mm = NULL; in bprm_mm_init()
474 static int bprm_stack_limits(struct linux_binprm *bprm) in bprm_stack_limits() argument
487 limit = min(limit, bprm->rlim_stack.rlim_cur / 4); in bprm_stack_limits()
506 ptr_size = (max(bprm->argc, 1) + bprm->envc) * sizeof(void *); in bprm_stack_limits()
511 bprm->argmin = bprm->p - limit; in bprm_stack_limits()
521 struct linux_binprm *bprm) in copy_strings() argument
543 if (!valid_arg_len(bprm, len)) in copy_strings()
547 pos = bprm->p; in copy_strings()
549 bprm->p -= len; in copy_strings()
551 if (bprm->p < bprm->argmin) in copy_strings()
580 page = get_arg_page(bprm, pos, 1); in copy_strings()
594 flush_arg_page(bprm, kpos, kmapped_page); in copy_strings()
615 int copy_string_kernel(const char *arg, struct linux_binprm *bprm) in copy_string_kernel() argument
618 unsigned long pos = bprm->p; in copy_string_kernel()
622 if (!valid_arg_len(bprm, len)) in copy_string_kernel()
627 bprm->p -= len; in copy_string_kernel()
628 if (IS_ENABLED(CONFIG_MMU) && bprm->p < bprm->argmin) in copy_string_kernel()
641 page = get_arg_page(bprm, pos, 1); in copy_string_kernel()
645 flush_arg_page(bprm, pos & PAGE_MASK, page); in copy_string_kernel()
657 struct linux_binprm *bprm) in copy_strings_kernel() argument
660 int ret = copy_string_kernel(argv[argc], bprm); in copy_strings_kernel()
749 int setup_arg_pages(struct linux_binprm *bprm, in setup_arg_pages() argument
756 struct vm_area_struct *vma = bprm->vma; in setup_arg_pages()
766 stack_base = bprm->rlim_stack.rlim_max; in setup_arg_pages()
780 mm->arg_start = bprm->p - stack_shift; in setup_arg_pages()
781 bprm->p = vma->vm_end - stack_shift; in setup_arg_pages()
792 bprm->p -= stack_shift; in setup_arg_pages()
793 mm->arg_start = bprm->p; in setup_arg_pages()
796 if (bprm->loader) in setup_arg_pages()
797 bprm->loader -= stack_shift; in setup_arg_pages()
798 bprm->exec -= stack_shift; in setup_arg_pages()
825 bprm->file); in setup_arg_pages()
844 rlim_stack = bprm->rlim_stack.rlim_cur & PAGE_MASK; in setup_arg_pages()
856 current->mm->start_stack = bprm->p; in setup_arg_pages()
873 int transfer_args_to_stack(struct linux_binprm *bprm, in transfer_args_to_stack() argument
879 stop = bprm->p >> PAGE_SHIFT; in transfer_args_to_stack()
883 unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0; in transfer_args_to_stack()
884 char *src = kmap(bprm->page[index]) + offset; in transfer_args_to_stack()
888 kunmap(bprm->page[index]); in transfer_args_to_stack()
1246 int begin_new_exec(struct linux_binprm * bprm) in begin_new_exec() argument
1252 retval = bprm_creds_from_file(bprm); in begin_new_exec()
1259 bprm->point_of_no_return = true; in begin_new_exec()
1273 set_mm_exe_file(bprm->mm, bprm->file); in begin_new_exec()
1276 would_dump(bprm, bprm->file); in begin_new_exec()
1277 if (bprm->have_execfd) in begin_new_exec()
1278 would_dump(bprm, bprm->executable); in begin_new_exec()
1283 acct_arg_size(bprm, 0); in begin_new_exec()
1284 retval = exec_mmap(bprm->mm); in begin_new_exec()
1288 bprm->mm = NULL; in begin_new_exec()
1314 me->personality &= ~bprm->per_clear; in begin_new_exec()
1324 if (bprm->secureexec) { in begin_new_exec()
1335 if (bprm->rlim_stack.rlim_cur > _STK_LIM) in begin_new_exec()
1336 bprm->rlim_stack.rlim_cur = _STK_LIM; in begin_new_exec()
1346 if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP || in begin_new_exec()
1354 __set_task_comm(me, kbasename(bprm->filename), true); in begin_new_exec()
1364 security_bprm_committing_creds(bprm); in begin_new_exec()
1366 commit_creds(bprm->cred); in begin_new_exec()
1367 bprm->cred = NULL; in begin_new_exec()
1382 security_bprm_committed_creds(bprm); in begin_new_exec()
1385 if (bprm->have_execfd) { in begin_new_exec()
1389 fd_install(retval, bprm->executable); in begin_new_exec()
1390 bprm->executable = NULL; in begin_new_exec()
1391 bprm->execfd = retval; in begin_new_exec()
1397 if (!bprm->cred) in begin_new_exec()
1405 void would_dump(struct linux_binprm *bprm, struct file *file) in would_dump() argument
1410 bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; in would_dump()
1413 user_ns = old = bprm->mm->user_ns; in would_dump()
1419 bprm->mm->user_ns = get_user_ns(user_ns); in would_dump()
1426 void setup_new_exec(struct linux_binprm * bprm) in setup_new_exec() argument
1431 arch_pick_mmap_layout(me->mm, &bprm->rlim_stack); in setup_new_exec()
1446 void finalize_exec(struct linux_binprm *bprm) in finalize_exec() argument
1450 current->signal->rlim[RLIMIT_STACK] = bprm->rlim_stack; in finalize_exec()
1461 static int prepare_bprm_creds(struct linux_binprm *bprm) in prepare_bprm_creds() argument
1466 bprm->cred = prepare_exec_creds(); in prepare_bprm_creds()
1467 if (likely(bprm->cred)) in prepare_bprm_creds()
1474 static void free_bprm(struct linux_binprm *bprm) in free_bprm() argument
1476 if (bprm->mm) { in free_bprm()
1477 acct_arg_size(bprm, 0); in free_bprm()
1478 mmput(bprm->mm); in free_bprm()
1480 free_arg_pages(bprm); in free_bprm()
1481 if (bprm->cred) { in free_bprm()
1483 abort_creds(bprm->cred); in free_bprm()
1485 if (bprm->file) { in free_bprm()
1486 allow_write_access(bprm->file); in free_bprm()
1487 fput(bprm->file); in free_bprm()
1489 if (bprm->executable) in free_bprm()
1490 fput(bprm->executable); in free_bprm()
1492 if (bprm->interp != bprm->filename) in free_bprm()
1493 kfree(bprm->interp); in free_bprm()
1494 kfree(bprm->fdpath); in free_bprm()
1495 kfree(bprm); in free_bprm()
1500 struct linux_binprm *bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); in alloc_bprm() local
1502 if (!bprm) in alloc_bprm()
1506 bprm->filename = filename->name; in alloc_bprm()
1509 bprm->fdpath = kasprintf(GFP_KERNEL, "/dev/fd/%d", fd); in alloc_bprm()
1511 bprm->fdpath = kasprintf(GFP_KERNEL, "/dev/fd/%d/%s", in alloc_bprm()
1513 if (!bprm->fdpath) in alloc_bprm()
1516 bprm->filename = bprm->fdpath; in alloc_bprm()
1518 bprm->interp = bprm->filename; in alloc_bprm()
1520 retval = bprm_mm_init(bprm); in alloc_bprm()
1523 return bprm; in alloc_bprm()
1526 free_bprm(bprm); in alloc_bprm()
1531 int bprm_change_interp(const char *interp, struct linux_binprm *bprm) in bprm_change_interp() argument
1534 if (bprm->interp != bprm->filename) in bprm_change_interp()
1535 kfree(bprm->interp); in bprm_change_interp()
1536 bprm->interp = kstrdup(interp, GFP_KERNEL); in bprm_change_interp()
1537 if (!bprm->interp) in bprm_change_interp()
1548 static void check_unsafe_exec(struct linux_binprm *bprm) in check_unsafe_exec() argument
1554 bprm->unsafe |= LSM_UNSAFE_PTRACE; in check_unsafe_exec()
1561 bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS; in check_unsafe_exec()
1574 bprm->unsafe |= LSM_UNSAFE_SHARE; in check_unsafe_exec()
1580 static void bprm_fill_uid(struct linux_binprm *bprm, struct file *file) in bprm_fill_uid() argument
1609 if (!kuid_has_mapping(bprm->cred->user_ns, uid) || in bprm_fill_uid()
1610 !kgid_has_mapping(bprm->cred->user_ns, gid)) in bprm_fill_uid()
1614 bprm->per_clear |= PER_CLEAR_ON_SETID; in bprm_fill_uid()
1615 bprm->cred->euid = uid; in bprm_fill_uid()
1619 bprm->per_clear |= PER_CLEAR_ON_SETID; in bprm_fill_uid()
1620 bprm->cred->egid = gid; in bprm_fill_uid()
1627 static int bprm_creds_from_file(struct linux_binprm *bprm) in bprm_creds_from_file() argument
1630 struct file *file = bprm->execfd_creds ? bprm->executable : bprm->file; in bprm_creds_from_file()
1632 bprm_fill_uid(bprm, file); in bprm_creds_from_file()
1633 return security_bprm_creds_from_file(bprm, file); in bprm_creds_from_file()
1642 static int prepare_binprm(struct linux_binprm *bprm) in prepare_binprm() argument
1646 memset(bprm->buf, 0, BINPRM_BUF_SIZE); in prepare_binprm()
1647 return kernel_read(bprm->file, bprm->buf, BINPRM_BUF_SIZE, &pos); in prepare_binprm()
1655 int remove_arg_zero(struct linux_binprm *bprm) in remove_arg_zero() argument
1662 if (!bprm->argc) in remove_arg_zero()
1666 offset = bprm->p & ~PAGE_MASK; in remove_arg_zero()
1667 page = get_arg_page(bprm, bprm->p, 0); in remove_arg_zero()
1675 offset++, bprm->p++) in remove_arg_zero()
1682 bprm->p++; in remove_arg_zero()
1683 bprm->argc--; in remove_arg_zero()
1695 static int search_binary_handler(struct linux_binprm *bprm) in search_binary_handler() argument
1701 retval = prepare_binprm(bprm); in search_binary_handler()
1705 retval = security_bprm_check(bprm); in search_binary_handler()
1717 retval = fmt->load_binary(bprm); in search_binary_handler()
1721 if (bprm->point_of_no_return || (retval != -ENOEXEC)) { in search_binary_handler()
1729 if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && in search_binary_handler()
1730 printable(bprm->buf[2]) && printable(bprm->buf[3])) in search_binary_handler()
1732 if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) in search_binary_handler()
1741 static int exec_binprm(struct linux_binprm *bprm) in exec_binprm() argument
1758 ret = search_binary_handler(bprm); in exec_binprm()
1761 if (!bprm->interpreter) in exec_binprm()
1764 exec = bprm->file; in exec_binprm()
1765 bprm->file = bprm->interpreter; in exec_binprm()
1766 bprm->interpreter = NULL; in exec_binprm()
1769 if (unlikely(bprm->have_execfd)) { in exec_binprm()
1770 if (bprm->executable) { in exec_binprm()
1774 bprm->executable = exec; in exec_binprm()
1779 audit_bprm(bprm); in exec_binprm()
1780 trace_sched_process_exec(current, old_pid, bprm); in exec_binprm()
1789 static int bprm_execve(struct linux_binprm *bprm, in bprm_execve() argument
1805 retval = prepare_bprm_creds(bprm); in bprm_execve()
1809 check_unsafe_exec(bprm); in bprm_execve()
1819 bprm->file = file; in bprm_execve()
1825 if (bprm->fdpath && in bprm_execve()
1827 bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE; in bprm_execve()
1830 retval = security_bprm_creds_for_exec(bprm); in bprm_execve()
1834 retval = exec_binprm(bprm); in bprm_execve()
1855 if (bprm->point_of_no_return && !fatal_signal_pending(current)) in bprm_execve()
1874 struct linux_binprm *bprm; in do_execveat_common() local
1896 bprm = alloc_bprm(fd, filename); in do_execveat_common()
1897 if (IS_ERR(bprm)) { in do_execveat_common()
1898 retval = PTR_ERR(bprm); in do_execveat_common()
1905 current->comm, bprm->filename); in do_execveat_common()
1908 bprm->argc = retval; in do_execveat_common()
1913 bprm->envc = retval; in do_execveat_common()
1915 retval = bprm_stack_limits(bprm); in do_execveat_common()
1919 retval = copy_string_kernel(bprm->filename, bprm); in do_execveat_common()
1922 bprm->exec = bprm->p; in do_execveat_common()
1924 retval = copy_strings(bprm->envc, envp, bprm); in do_execveat_common()
1928 retval = copy_strings(bprm->argc, argv, bprm); in do_execveat_common()
1938 if (bprm->argc == 0) { in do_execveat_common()
1939 retval = copy_string_kernel("", bprm); in do_execveat_common()
1942 bprm->argc = 1; in do_execveat_common()
1945 retval = bprm_execve(bprm, fd, filename, flags); in do_execveat_common()
1947 free_bprm(bprm); in do_execveat_common()
1958 struct linux_binprm *bprm; in kernel_execve() local
1966 bprm = alloc_bprm(fd, filename); in kernel_execve()
1967 if (IS_ERR(bprm)) { in kernel_execve()
1968 retval = PTR_ERR(bprm); in kernel_execve()
1977 bprm->argc = retval; in kernel_execve()
1982 bprm->envc = retval; in kernel_execve()
1984 retval = bprm_stack_limits(bprm); in kernel_execve()
1988 retval = copy_string_kernel(bprm->filename, bprm); in kernel_execve()
1991 bprm->exec = bprm->p; in kernel_execve()
1993 retval = copy_strings_kernel(bprm->envc, envp, bprm); in kernel_execve()
1997 retval = copy_strings_kernel(bprm->argc, argv, bprm); in kernel_execve()
2001 retval = bprm_execve(bprm, fd, filename, 0); in kernel_execve()
2003 free_bprm(bprm); in kernel_execve()