--- /dev/null
+/* Test execveat at the various corner cases.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/temp_file.h>
+#include <support/xdlfcn.h>
+#include <support/xstdio.h>
+#include <support/xunistd.h>
+#include <wait.h>
+#include <support/test-driver.h>
+
+int
+call_execveat (int fd, const char *pathname, int flags, int expected_fail,
+ int num)
+{
+ char *envp[] = { (char *) "FOO=3", NULL };
+ char *argv[] = { (char *) "sh", (char *) "-c", (char *) "exit $FOO", NULL };
+ pid_t pid;
+ int status;
+
+ if (test_verbose > 0)
+ printf ("call line number: %d\n", num);
+
+ pid = xfork ();
+ if (pid == 0)
+ {
+ TEST_COMPARE (execveat (fd, pathname, argv, envp, flags), -1);
+ if (errno == ENOSYS)
+ exit (EXIT_UNSUPPORTED);
+ else if (errno == expected_fail)
+ {
+ if (test_verbose > 0)
+ printf ("expected fail: errno %d\n", errno);
+ _exit (0);
+ }
+ else
+ FAIL_EXIT1 ("execveat failed: %m (%d)", errno);
+ }
+ xwaitpid (pid, &status, 0);
+
+ if (!WIFEXITED (status))
+ FAIL_RET ("child hasn't exited normally");
+
+ if (WIFEXITED (status))
+ {
+ if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
+ FAIL_UNSUPPORTED ("execveat is unimplemented");
+ else if (expected_fail != 0)
+ TEST_COMPARE (WEXITSTATUS (status), 0);
+ else
+ TEST_COMPARE (WEXITSTATUS (status), 3);
+ }
+ return 0;
+}
+
+static int
+do_test (void)
+{
+ DIR *dirp;
+ int fd, fd_out;
+ char *tmp_dir, *symlink_name, *tmp_sh;
+ struct stat64 st;
+
+ dirp = opendir ("/bin");
+ if (dirp == NULL)
+ FAIL_EXIT1 ("failed to open /bin");
+ fd = dirfd (dirp);
+
+ /* Call execveat for various fd/pathname combinations. */
+
+ /* Check the pathname relative to a valid dirfd. */
+ call_execveat (fd, "sh", 0, 0, __LINE__);
+ xchdir ("/bin");
+ /* Use the special value AT_FDCWD as dirfd. Quoting open(2):
+ If pathname is relative and dirfd is the special value AT_FDCWD, then
+ pathname is interpreted relative to the current working directory of
+ the calling process. */
+ call_execveat (AT_FDCWD, "sh", 0, 0, __LINE__);
+ xclose (fd);
+#ifdef O_PATH
+ /* Check the pathname relative to a valid dirfd with O_PATH. */
+ fd = xopen ("/bin", O_PATH | O_DIRECTORY, O_RDONLY);
+ call_execveat (fd, "sh", 0, 0, __LINE__);
+ xclose (fd);
+
+ /* Check absolute pathname, dirfd should be ignored. */
+ call_execveat (AT_FDCWD, "/bin/sh", 0, 0, __LINE__);
+ fd = xopen ("/usr", O_PATH | O_DIRECTORY, 0);
+ /* Same check for absolute pathname, but with input file descriptor
+ openend with different flags. The dirfd should be ignored. */
+ call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+ xclose (fd);
+#endif
+
+ fd = xopen ("/usr", O_RDONLY, 0);
+ /* Same check for absolute pathname, but with input file descriptor
+ openend with different flags. The dirfd should be ignored. */
+ call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+ xclose (fd);
+
+ fd = xopen ("/bin/sh", O_RDONLY, 0);
+ /* Check relative pathname, where dirfd does not point to a directory. */
+ call_execveat (fd, "sh", 0, ENOTDIR, __LINE__);
+ /* Check absolute pathname, but dirfd is a regular file. The dirfd
+ should be ignored. */
+ call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+ xclose (fd);
+
+#ifdef O_PATH
+ /* Quoting open(2): O_PATH
+ Obtain a file descriptor that can be used for two purposes: to
+ indicate a location in the filesystem tree and to perform
+ operations that act purely at the file descriptor level. */
+ fd = xopen ("/bin/sh", O_PATH, 0);
+ /* Check the empty pathname. Dirfd is a regular file with O_PATH. */
+ call_execveat (fd, "", 0, ENOENT, __LINE__);
+ /* Same check for an empty pathname, but with AT_EMPTY_PATH flag.
+ Quoting open(2):
+ If oldpath is an empty string, create a link to the file referenced
+ by olddirfd (which may have been obtained using the open(2) O_PATH flag. */
+ call_execveat (fd, "", AT_EMPTY_PATH, 0, __LINE__);
+ call_execveat (fd, "", AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW, 0, __LINE__);
+ xclose (fd);
+
+ /* Create a temporary directory "tmp_dir" and create a symbolik link tmp_sh
+ pointing to /bin/sh inside the tmp_dir. Open dirfd as a symbolic link. */
+ tmp_dir = support_create_temp_directory ("tst-execveat_dir");
+ symlink_name = xasprintf ("%s/symlink", tmp_dir);
+ xsymlink ("tmp_sh", symlink_name);
+ add_temp_file (symlink_name);
+ tmp_sh = xasprintf ("%s/tmp_sh", tmp_dir);
+ add_temp_file (tmp_sh);
+ fd_out = xopen (symlink_name, O_CREAT | O_WRONLY, 0);
+ xstat ("/bin/sh", &st);
+ fd = xopen ("/bin/sh", O_RDONLY, 0);
+ xcopy_file_range (fd, 0, fd_out, 0, st.st_size, 0);
+ xfchmod (fd_out, 0700);
+ xclose (fd);
+ xclose (fd_out);
+ fd_out = xopen (symlink_name, O_PATH, 0);
+
+ /* Check the empty pathname. Dirfd is a symbolic link. */
+ call_execveat (fd_out, "", 0, ENOENT, __LINE__);
+ call_execveat (fd_out, "", AT_EMPTY_PATH, 0, __LINE__);
+ call_execveat (fd_out, "", AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW, 0,
+ __LINE__);
+ xclose (fd_out);
+ free (symlink_name);
+ free (tmp_sh);
+ free (tmp_dir);
+#endif
+
+ /* Call execveat with closed fd, we expect this to fail with EBADF. */
+ call_execveat (fd, "sh", 0, EBADF, __LINE__);
+ /* Call execveat with closed fd, we expect this to pass because the pathname is
+ absolute. */
+ call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+
+ return 0;
+}
+
+#include <support/test-driver.c>
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