Lines Matching refs:bprm
78 static int bprm_creds_from_file(struct linux_binprm *bprm);
186 static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) in acct_arg_size() argument
189 long diff = (long)(pages - bprm->vma_pages); in acct_arg_size()
194 bprm->vma_pages = pages; in acct_arg_size()
198 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, in get_arg_page() argument
207 ret = expand_downwards(bprm->vma, pos); in get_arg_page()
220 mmap_read_lock(bprm->mm); in get_arg_page()
221 ret = get_user_pages_remote(bprm->mm, pos, 1, gup_flags, in get_arg_page()
223 mmap_read_unlock(bprm->mm); in get_arg_page()
228 acct_arg_size(bprm, vma_pages(bprm->vma)); in get_arg_page()
238 static void free_arg_pages(struct linux_binprm *bprm) in free_arg_pages() argument
242 static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, in flush_arg_page() argument
245 flush_cache_page(bprm->vma, pos, page_to_pfn(page)); in flush_arg_page()
248 static int __bprm_mm_init(struct linux_binprm *bprm) in __bprm_mm_init() argument
252 struct mm_struct *mm = bprm->mm; in __bprm_mm_init()
254 bprm->vma = vma = vm_area_alloc(mm); in __bprm_mm_init()
282 bprm->p = vma->vm_end - sizeof(void *); in __bprm_mm_init()
287 bprm->vma = NULL; in __bprm_mm_init()
292 static bool valid_arg_len(struct linux_binprm *bprm, long len) in valid_arg_len() argument
299 static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) in acct_arg_size() argument
303 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, in get_arg_page() argument
308 page = bprm->page[pos / PAGE_SIZE]; in get_arg_page()
313 bprm->page[pos / PAGE_SIZE] = page; in get_arg_page()
323 static void free_arg_page(struct linux_binprm *bprm, int i) in free_arg_page() argument
325 if (bprm->page[i]) { in free_arg_page()
326 __free_page(bprm->page[i]); in free_arg_page()
327 bprm->page[i] = NULL; in free_arg_page()
331 static void free_arg_pages(struct linux_binprm *bprm) in free_arg_pages() argument
336 free_arg_page(bprm, i); in free_arg_pages()
339 static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, in flush_arg_page() argument
344 static int __bprm_mm_init(struct linux_binprm *bprm) in __bprm_mm_init() argument
346 bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *); in __bprm_mm_init()
350 static bool valid_arg_len(struct linux_binprm *bprm, long len) in valid_arg_len() argument
352 return len <= bprm->p; in valid_arg_len()
363 static int bprm_mm_init(struct linux_binprm *bprm) in bprm_mm_init() argument
368 bprm->mm = mm = mm_alloc(); in bprm_mm_init()
375 bprm->rlim_stack = current->signal->rlim[RLIMIT_STACK]; in bprm_mm_init()
378 err = __bprm_mm_init(bprm); in bprm_mm_init()
386 bprm->mm = NULL; in bprm_mm_init()
472 static int bprm_stack_limits(struct linux_binprm *bprm) in bprm_stack_limits() argument
485 limit = min(limit, bprm->rlim_stack.rlim_cur / 4); in bprm_stack_limits()
504 ptr_size = (max(bprm->argc, 1) + bprm->envc) * sizeof(void *); in bprm_stack_limits()
509 bprm->argmin = bprm->p - limit; in bprm_stack_limits()
519 struct linux_binprm *bprm) in copy_strings() argument
541 if (!valid_arg_len(bprm, len)) in copy_strings()
545 pos = bprm->p; in copy_strings()
547 bprm->p -= len; in copy_strings()
549 if (bprm->p < bprm->argmin) in copy_strings()
578 page = get_arg_page(bprm, pos, 1); in copy_strings()
592 flush_arg_page(bprm, kpos, kmapped_page); in copy_strings()
613 int copy_string_kernel(const char *arg, struct linux_binprm *bprm) in copy_string_kernel() argument
616 unsigned long pos = bprm->p; in copy_string_kernel()
620 if (!valid_arg_len(bprm, len)) in copy_string_kernel()
625 bprm->p -= len; in copy_string_kernel()
626 if (IS_ENABLED(CONFIG_MMU) && bprm->p < bprm->argmin) in copy_string_kernel()
638 page = get_arg_page(bprm, pos, 1); in copy_string_kernel()
641 flush_arg_page(bprm, pos & PAGE_MASK, page); in copy_string_kernel()
651 struct linux_binprm *bprm) in copy_strings_kernel() argument
654 int ret = copy_string_kernel(argv[argc], bprm); in copy_strings_kernel()
743 int setup_arg_pages(struct linux_binprm *bprm, in setup_arg_pages() argument
750 struct vm_area_struct *vma = bprm->vma; in setup_arg_pages()
762 stack_base = bprm->rlim_stack.rlim_max; in setup_arg_pages()
776 mm->arg_start = bprm->p - stack_shift; in setup_arg_pages()
777 bprm->p = vma->vm_end - stack_shift; in setup_arg_pages()
788 bprm->p -= stack_shift; in setup_arg_pages()
789 mm->arg_start = bprm->p; in setup_arg_pages()
792 if (bprm->loader) in setup_arg_pages()
793 bprm->loader -= stack_shift; in setup_arg_pages()
794 bprm->exec -= stack_shift; in setup_arg_pages()
826 bprm->file); in setup_arg_pages()
845 rlim_stack = bprm->rlim_stack.rlim_cur & PAGE_MASK; in setup_arg_pages()
854 current->mm->start_stack = bprm->p; in setup_arg_pages()
871 int transfer_args_to_stack(struct linux_binprm *bprm, in transfer_args_to_stack() argument
877 stop = bprm->p >> PAGE_SHIFT; in transfer_args_to_stack()
881 unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0; in transfer_args_to_stack()
882 char *src = kmap_local_page(bprm->page[index]) + offset; in transfer_args_to_stack()
1243 int begin_new_exec(struct linux_binprm * bprm) in begin_new_exec() argument
1249 retval = bprm_creds_from_file(bprm); in begin_new_exec()
1256 bprm->point_of_no_return = true; in begin_new_exec()
1280 retval = set_mm_exe_file(bprm->mm, bprm->file); in begin_new_exec()
1285 would_dump(bprm, bprm->file); in begin_new_exec()
1286 if (bprm->have_execfd) in begin_new_exec()
1287 would_dump(bprm, bprm->executable); in begin_new_exec()
1292 acct_arg_size(bprm, 0); in begin_new_exec()
1293 retval = exec_mmap(bprm->mm); in begin_new_exec()
1297 bprm->mm = NULL; in begin_new_exec()
1321 me->personality &= ~bprm->per_clear; in begin_new_exec()
1333 if (bprm->secureexec) { in begin_new_exec()
1344 if (bprm->rlim_stack.rlim_cur > _STK_LIM) in begin_new_exec()
1345 bprm->rlim_stack.rlim_cur = _STK_LIM; in begin_new_exec()
1355 if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP || in begin_new_exec()
1363 __set_task_comm(me, kbasename(bprm->filename), true); in begin_new_exec()
1370 retval = set_cred_ucounts(bprm->cred); in begin_new_exec()
1377 security_bprm_committing_creds(bprm); in begin_new_exec()
1379 commit_creds(bprm->cred); in begin_new_exec()
1380 bprm->cred = NULL; in begin_new_exec()
1395 security_bprm_committed_creds(bprm); in begin_new_exec()
1398 if (bprm->have_execfd) { in begin_new_exec()
1402 fd_install(retval, bprm->executable); in begin_new_exec()
1403 bprm->executable = NULL; in begin_new_exec()
1404 bprm->execfd = retval; in begin_new_exec()
1415 void would_dump(struct linux_binprm *bprm, struct file *file) in would_dump() argument
1421 bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; in would_dump()
1424 user_ns = old = bprm->mm->user_ns; in would_dump()
1430 bprm->mm->user_ns = get_user_ns(user_ns); in would_dump()
1437 void setup_new_exec(struct linux_binprm * bprm) in setup_new_exec() argument
1442 arch_pick_mmap_layout(me->mm, &bprm->rlim_stack); in setup_new_exec()
1457 void finalize_exec(struct linux_binprm *bprm) in finalize_exec() argument
1461 current->signal->rlim[RLIMIT_STACK] = bprm->rlim_stack; in finalize_exec()
1472 static int prepare_bprm_creds(struct linux_binprm *bprm) in prepare_bprm_creds() argument
1477 bprm->cred = prepare_exec_creds(); in prepare_bprm_creds()
1478 if (likely(bprm->cred)) in prepare_bprm_creds()
1485 static void free_bprm(struct linux_binprm *bprm) in free_bprm() argument
1487 if (bprm->mm) { in free_bprm()
1488 acct_arg_size(bprm, 0); in free_bprm()
1489 mmput(bprm->mm); in free_bprm()
1491 free_arg_pages(bprm); in free_bprm()
1492 if (bprm->cred) { in free_bprm()
1494 abort_creds(bprm->cred); in free_bprm()
1496 if (bprm->file) { in free_bprm()
1497 allow_write_access(bprm->file); in free_bprm()
1498 fput(bprm->file); in free_bprm()
1500 if (bprm->executable) in free_bprm()
1501 fput(bprm->executable); in free_bprm()
1503 if (bprm->interp != bprm->filename) in free_bprm()
1504 kfree(bprm->interp); in free_bprm()
1505 kfree(bprm->fdpath); in free_bprm()
1506 kfree(bprm); in free_bprm()
1511 struct linux_binprm *bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); in alloc_bprm() local
1513 if (!bprm) in alloc_bprm()
1517 bprm->filename = filename->name; in alloc_bprm()
1520 bprm->fdpath = kasprintf(GFP_KERNEL, "/dev/fd/%d", fd); in alloc_bprm()
1522 bprm->fdpath = kasprintf(GFP_KERNEL, "/dev/fd/%d/%s", in alloc_bprm()
1524 if (!bprm->fdpath) in alloc_bprm()
1527 bprm->filename = bprm->fdpath; in alloc_bprm()
1529 bprm->interp = bprm->filename; in alloc_bprm()
1531 retval = bprm_mm_init(bprm); in alloc_bprm()
1534 return bprm; in alloc_bprm()
1537 free_bprm(bprm); in alloc_bprm()
1542 int bprm_change_interp(const char *interp, struct linux_binprm *bprm) in bprm_change_interp() argument
1545 if (bprm->interp != bprm->filename) in bprm_change_interp()
1546 kfree(bprm->interp); in bprm_change_interp()
1547 bprm->interp = kstrdup(interp, GFP_KERNEL); in bprm_change_interp()
1548 if (!bprm->interp) in bprm_change_interp()
1559 static void check_unsafe_exec(struct linux_binprm *bprm) in check_unsafe_exec() argument
1565 bprm->unsafe |= LSM_UNSAFE_PTRACE; in check_unsafe_exec()
1572 bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS; in check_unsafe_exec()
1591 bprm->unsafe |= LSM_UNSAFE_SHARE; in check_unsafe_exec()
1597 static void bprm_fill_uid(struct linux_binprm *bprm, struct file *file) in bprm_fill_uid() argument
1628 if (!vfsuid_has_mapping(bprm->cred->user_ns, vfsuid) || in bprm_fill_uid()
1629 !vfsgid_has_mapping(bprm->cred->user_ns, vfsgid)) in bprm_fill_uid()
1633 bprm->per_clear |= PER_CLEAR_ON_SETID; in bprm_fill_uid()
1634 bprm->cred->euid = vfsuid_into_kuid(vfsuid); in bprm_fill_uid()
1638 bprm->per_clear |= PER_CLEAR_ON_SETID; in bprm_fill_uid()
1639 bprm->cred->egid = vfsgid_into_kgid(vfsgid); in bprm_fill_uid()
1646 static int bprm_creds_from_file(struct linux_binprm *bprm) in bprm_creds_from_file() argument
1649 struct file *file = bprm->execfd_creds ? bprm->executable : bprm->file; in bprm_creds_from_file()
1651 bprm_fill_uid(bprm, file); in bprm_creds_from_file()
1652 return security_bprm_creds_from_file(bprm, file); in bprm_creds_from_file()
1661 static int prepare_binprm(struct linux_binprm *bprm) in prepare_binprm() argument
1665 memset(bprm->buf, 0, BINPRM_BUF_SIZE); in prepare_binprm()
1666 return kernel_read(bprm->file, bprm->buf, BINPRM_BUF_SIZE, &pos); in prepare_binprm()
1674 int remove_arg_zero(struct linux_binprm *bprm) in remove_arg_zero() argument
1681 if (!bprm->argc) in remove_arg_zero()
1685 offset = bprm->p & ~PAGE_MASK; in remove_arg_zero()
1686 page = get_arg_page(bprm, bprm->p, 0); in remove_arg_zero()
1694 offset++, bprm->p++) in remove_arg_zero()
1701 bprm->p++; in remove_arg_zero()
1702 bprm->argc--; in remove_arg_zero()
1714 static int search_binary_handler(struct linux_binprm *bprm) in search_binary_handler() argument
1720 retval = prepare_binprm(bprm); in search_binary_handler()
1724 retval = security_bprm_check(bprm); in search_binary_handler()
1736 retval = fmt->load_binary(bprm); in search_binary_handler()
1740 if (bprm->point_of_no_return || (retval != -ENOEXEC)) { in search_binary_handler()
1748 if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && in search_binary_handler()
1749 printable(bprm->buf[2]) && printable(bprm->buf[3])) in search_binary_handler()
1751 if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) in search_binary_handler()
1761 static int exec_binprm(struct linux_binprm *bprm) in exec_binprm() argument
1778 ret = search_binary_handler(bprm); in exec_binprm()
1781 if (!bprm->interpreter) in exec_binprm()
1784 exec = bprm->file; in exec_binprm()
1785 bprm->file = bprm->interpreter; in exec_binprm()
1786 bprm->interpreter = NULL; in exec_binprm()
1789 if (unlikely(bprm->have_execfd)) { in exec_binprm()
1790 if (bprm->executable) { in exec_binprm()
1794 bprm->executable = exec; in exec_binprm()
1799 audit_bprm(bprm); in exec_binprm()
1800 trace_sched_process_exec(current, old_pid, bprm); in exec_binprm()
1809 static int bprm_execve(struct linux_binprm *bprm, in bprm_execve() argument
1815 retval = prepare_bprm_creds(bprm); in bprm_execve()
1824 check_unsafe_exec(bprm); in bprm_execve()
1835 bprm->file = file; in bprm_execve()
1845 if (bprm->fdpath && get_close_on_exec(fd)) in bprm_execve()
1846 bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE; in bprm_execve()
1849 retval = security_bprm_creds_for_exec(bprm); in bprm_execve()
1853 retval = exec_binprm(bprm); in bprm_execve()
1873 if (bprm->point_of_no_return && !fatal_signal_pending(current)) in bprm_execve()
1889 struct linux_binprm *bprm; in do_execveat_common() local
1911 bprm = alloc_bprm(fd, filename); in do_execveat_common()
1912 if (IS_ERR(bprm)) { in do_execveat_common()
1913 retval = PTR_ERR(bprm); in do_execveat_common()
1920 current->comm, bprm->filename); in do_execveat_common()
1923 bprm->argc = retval; in do_execveat_common()
1928 bprm->envc = retval; in do_execveat_common()
1930 retval = bprm_stack_limits(bprm); in do_execveat_common()
1934 retval = copy_string_kernel(bprm->filename, bprm); in do_execveat_common()
1937 bprm->exec = bprm->p; in do_execveat_common()
1939 retval = copy_strings(bprm->envc, envp, bprm); in do_execveat_common()
1943 retval = copy_strings(bprm->argc, argv, bprm); in do_execveat_common()
1953 if (bprm->argc == 0) { in do_execveat_common()
1954 retval = copy_string_kernel("", bprm); in do_execveat_common()
1957 bprm->argc = 1; in do_execveat_common()
1960 retval = bprm_execve(bprm, fd, filename, flags); in do_execveat_common()
1962 free_bprm(bprm); in do_execveat_common()
1973 struct linux_binprm *bprm; in kernel_execve() local
1985 bprm = alloc_bprm(fd, filename); in kernel_execve()
1986 if (IS_ERR(bprm)) { in kernel_execve()
1987 retval = PTR_ERR(bprm); in kernel_execve()
1996 bprm->argc = retval; in kernel_execve()
2001 bprm->envc = retval; in kernel_execve()
2003 retval = bprm_stack_limits(bprm); in kernel_execve()
2007 retval = copy_string_kernel(bprm->filename, bprm); in kernel_execve()
2010 bprm->exec = bprm->p; in kernel_execve()
2012 retval = copy_strings_kernel(bprm->envc, envp, bprm); in kernel_execve()
2016 retval = copy_strings_kernel(bprm->argc, argv, bprm); in kernel_execve()
2020 retval = bprm_execve(bprm, fd, filename, 0); in kernel_execve()
2022 free_bprm(bprm); in kernel_execve()