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3844cdc330
We must not change the permissions of /dev/null if running as root. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* Test various fchmod error cases.
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Copyright (C) 2024 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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static int
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do_test (void)
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{
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{
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/* Permissions on /dev/null (the opened descriptor) cannot be changed. */
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int fd = xopen ("/dev/null", O_RDWR, 0);
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if (getuid () == 0)
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puts ("info: /dev/null fchmod test skipped because of root privileges");
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else
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{
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errno = 0;
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TEST_COMPARE (fchmod (fd, 0), -1);
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TEST_COMPARE (errno, EPERM);
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}
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xclose (fd);
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/* Now testing an invalid file descriptor. */
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errno = 0;
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TEST_COMPARE (fchmod (fd, 0600), -1);
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TEST_COMPARE (errno, EBADF);
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}
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errno = 0;
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TEST_COMPARE (fchmod (-1, 0600), -1);
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TEST_COMPARE (errno, EBADF);
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errno = 0;
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TEST_COMPARE (fchmod (AT_FDCWD, 0600), -1);
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TEST_COMPARE (errno, EBADF);
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/* Linux supports fchmod on pretty much all file descriptors, so
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there is no check for failure on specific types of descriptors
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here. */
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return 0;
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}
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#include <support/test-driver.c>
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