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-rw-r--r--io/tst-fchownat.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/io/tst-fchownat.c b/io/tst-fchownat.c
new file mode 100644
index 0000000..fd32ac9
--- /dev/null
+++ b/io/tst-fchownat.c
@@ -0,0 +1,190 @@
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static void prepare (void);
+#define PREPARE(argc, argv) prepare ()
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+
+#include "../test-skeleton.c"
+
+static int dir_fd;
+
+static void
+prepare (void)
+{
+#if _POSIX_CHOWN_RESTRICTED > 0
+ uid_t uid = getuid ();
+ if (uid != 0)
+ {
+ puts ("need root privileges");
+ exit (0);
+ }
+#endif
+
+ size_t test_dir_len = strlen (test_dir);
+ static const char dir_name[] = "/tst-fchownat.XXXXXX";
+
+ size_t dirbuflen = test_dir_len + sizeof (dir_name);
+ char *dirbuf = malloc (dirbuflen);
+ if (dirbuf == NULL)
+ {
+ puts ("out of memory");
+ exit (1);
+ }
+
+ snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
+ if (mkdtemp (dirbuf) == NULL)
+ {
+ puts ("cannot create temporary directory");
+ exit (1);
+ }
+
+ add_temp_file (dirbuf);
+
+ dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
+ if (dir_fd == -1)
+ {
+ puts ("cannot open directory");
+ exit (1);
+ }
+}
+
+
+static int
+do_test (void)
+{
+ /* fdopendir takes over the descriptor, make a copy. */
+ int dupfd = dup (dir_fd);
+ if (dupfd == -1)
+ {
+ puts ("dup failed");
+ return 1;
+ }
+ if (lseek (dupfd, 0, SEEK_SET) != 0)
+ {
+ puts ("1st lseek failed");
+ return 1;
+ }
+
+ /* The directory should be empty safe the . and .. files. */
+ DIR *dir = fdopendir (dupfd);
+ if (dir == NULL)
+ {
+ puts ("fdopendir failed");
+ return 1;
+ }
+ struct dirent64 *d;
+ while ((d = readdir64 (dir)) != NULL)
+ if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
+ {
+ printf ("temp directory contains file \"%s\"\n", d->d_name);
+ return 1;
+ }
+ closedir (dir);
+
+ /* Try to create a file. */
+ int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
+ if (fd == -1)
+ {
+ if (errno == ENOSYS)
+ {
+ puts ("*at functions not supported");
+ return 0;
+ }
+
+ puts ("file creation failed");
+ return 1;
+ }
+ write (fd, "hello", 5);
+ puts ("file created");
+
+ struct stat64 st1;
+ if (fstat64 (fd, &st1) != 0)
+ {
+ puts ("fstat64 failed");
+ return 1;
+ }
+
+ /* Before closing the file, try using this file descriptor to open
+ another file. This must fail. */
+ if (fchownat (fd, "some-file", 1, 1, 0) != -1)
+ {
+ puts ("fchownat using descriptor for normal file worked");
+ return 1;
+ }
+ if (errno != ENOTDIR)
+ {
+ puts ("\
+error for fchownat using descriptor for normal file not ENOTDIR ");
+ return 1;
+ }
+
+ close (fd);
+
+ if (fchownat (dir_fd, "some-file", st1.st_uid + 1, st1.st_gid + 1, 0) != 0)
+ {
+ puts ("fchownat failed");
+ return 1;
+ }
+
+ struct stat64 st2;
+ if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
+ {
+ puts ("fstatat64 failed");
+ return 1;
+ }
+
+ if (st1.st_uid + 1 != st2.st_uid || st1.st_gid + 1 != st2.st_gid)
+ {
+ puts ("owner change failed");
+ return 1;
+ }
+
+ if (unlinkat (dir_fd, "some-file", 0) != 0)
+ {
+ puts ("unlinkat failed");
+ return 1;
+ }
+
+ /* Create a file descriptor which is closed again right away. */
+ int dir_fd2 = dup (dir_fd);
+ if (dir_fd2 == -1)
+ {
+ puts ("dup failed");
+ return 1;
+ }
+ close (dir_fd2);
+
+ if (fchownat (dir_fd2, "some-file", 1, 1, 0) != -1)
+ {
+ puts ("fchownat using closed descriptor worked");
+ return 1;
+ }
+ if (errno != EBADF)
+ {
+ puts ("error for fchownat using closed descriptor not EBADF ");
+ return 1;
+ }
+
+ close (dir_fd);
+
+ if (fchownat (-1, "some-file", 1, 1, 0) != -1)
+ {
+ puts ("fchownat using invalid descriptor worked");
+ return 1;
+ }
+ if (errno != EBADF)
+ {
+ puts ("error for fchownat using invalid descriptor not EBADF ");
+ return 1;
+ }
+
+ return 0;
+}