217 lines
6.0 KiB
C
217 lines
6.0 KiB
C
/* Test open and openat with O_TMPFILE.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This test verifies that open and openat work as expected, i.e. they
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create a deleted file with the requested file mode. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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#ifdef O_TMPFILE
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typedef int (*wrapper_func) (const char *, int, mode_t);
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/* Error-checking wrapper for the open function, compatible with the
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wrapper_func type. */
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static int
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wrap_open (const char *path, int flags, mode_t mode)
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{
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int ret = open (path, flags, mode);
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if (ret < 0)
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{
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printf ("error: open (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
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exit (1);
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}
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return ret;
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}
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/* Error-checking wrapper for the openat function, compatible with the
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wrapper_func type. */
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static int
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wrap_openat (const char *path, int flags, mode_t mode)
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{
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int ret = openat (AT_FDCWD, path, flags, mode);
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if (ret < 0)
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{
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printf ("error: openat (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
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exit (1);
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}
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return ret;
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}
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/* Return true if FD is flagged as deleted in /proc/self/fd, false if
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not. */
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static bool
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is_file_deteted (int fd)
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{
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char *proc_fd_path = xasprintf ("/proc/self/fd/%d", fd);
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char file_path[4096];
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ssize_t file_path_length
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= readlink (proc_fd_path, file_path, sizeof (file_path));
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if (file_path_length < 0)
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{
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printf ("error: readlink (\"%s\"): %m", proc_fd_path);
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free (proc_fd_path);
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exit (1);
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}
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free (proc_fd_path);
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if (file_path_length == sizeof (file_path))
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{
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printf ("error: path in /proc resolves to overlong file name: %.*s\n",
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(int) file_path_length, file_path);
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exit (1);
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}
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const char *deleted = " (deleted)";
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if (file_path_length < strlen (deleted))
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{
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printf ("error: path in /proc is too short: %.*s\n",
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(int) file_path_length, file_path);
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exit (1);
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}
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return memcmp (file_path + file_path_length - strlen (deleted),
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deleted, strlen (deleted)) == 0;
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}
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/* Check open/openat (as specified by OP and WRAPPER) with a specific
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PATH/FLAGS/MODE combination. */
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static void
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check_wrapper_flags_mode (const char *op, wrapper_func wrapper,
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const char *path, int flags, mode_t mode)
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{
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int fd = wrapper (path, flags | O_TMPFILE, mode);
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struct stat64 st;
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if (fstat64 (fd, &st) != 0)
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{
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printf ("error: fstat64: %m\n");
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exit (1);
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}
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/* Verify that the mode was correctly processed. */
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int actual_mode = st.st_mode & 0777;
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if (actual_mode != mode)
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{
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printf ("error: unexpected mode; expected 0%03o, actual 0%03o\n",
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mode, actual_mode);
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exit (1);
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}
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/* Check that the file is marked as deleted in /proc. */
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if (!is_file_deteted (fd))
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{
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printf ("error: path in /proc is not marked as deleted\n");
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exit (1);
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}
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close (fd);
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}
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/* Check OP/WRAPPER with various flags at a specific PATH and
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MODE. */
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static void
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check_wrapper_mode (const char *op, wrapper_func wrapper,
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const char *path, mode_t mode)
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{
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check_wrapper_flags_mode (op, wrapper, path, O_WRONLY, mode);
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check_wrapper_flags_mode (op, wrapper, path, O_WRONLY | O_EXCL, mode);
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check_wrapper_flags_mode (op, wrapper, path, O_RDWR, mode);
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check_wrapper_flags_mode (op, wrapper, path, O_RDWR | O_EXCL, mode);
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}
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/* Check open/openat with varying permissions. */
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static void
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check_wrapper (const char *op, wrapper_func wrapper,
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const char *path)
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{
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printf ("info: testing %s at: %s\n", op, path);
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check_wrapper_mode (op, wrapper, path, 0);
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check_wrapper_mode (op, wrapper, path, 0640);
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check_wrapper_mode (op, wrapper, path, 0600);
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check_wrapper_mode (op, wrapper, path, 0755);
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check_wrapper_mode (op, wrapper, path, 0750);
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}
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/* Verify that the directory at PATH supports O_TMPFILE. Exit with
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status 77 (unsupported) if the kernel does not support O_TMPFILE.
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Even with kernel support, not all file systems O_TMPFILE, so return
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true if the directory supports O_TMPFILE, false if not. */
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static bool
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probe_path (const char *path)
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{
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int fd = openat (AT_FDCWD, path, O_TMPFILE | O_RDWR, 0);
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if (fd < 0)
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{
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if (errno == EISDIR)
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/* The system does not support O_TMPFILE. */
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{
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printf ("info: kernel does not support O_TMPFILE\n");
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exit (77);
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}
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if (errno == EOPNOTSUPP)
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{
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printf ("info: path does not support O_TMPFILE: %s\n", path);
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return false;
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}
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printf ("error: openat (\"%s\", O_TMPFILE | O_RDWR): %m\n", path);
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exit (1);
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}
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close (fd);
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return true;
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}
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static int
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do_test (void)
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{
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umask (0);
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const char *paths[] = { ".", "/dev/shm", "/tmp",
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getenv ("TEST_TMPFILE_PATH"),
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NULL };
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bool supported = false;
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for (int i = 0; paths[i] != NULL; ++i)
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if (probe_path (paths[i]))
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{
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supported = true;
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check_wrapper ("open", wrap_open, paths[i]);
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check_wrapper ("openat", wrap_openat, paths[i]);
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}
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if (!supported)
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return 77;
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return 0;
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}
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#else /* !O_TMPFILE */
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static int
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do_test (void)
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{
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return 77;
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}
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#endif /* O_TMPFILE */
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