89 lines
2.7 KiB
Diff
89 lines
2.7 KiB
Diff
commit 424d97be50488beb6196c0ff0bc3dfeb87b4281c
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Aug 30 20:37:18 2024 +0200
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io: Add error tests for fchmod
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On Linux most descriptors that do not correspond to file system
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entities (such as anonymous pipes and sockets) have file permissions
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that can be changed. While it is possible to create a custom file
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system that returns (say) EINVAL for an fchmod attempt, testing this
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does not appear to be useful.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/io/Makefile b/io/Makefile
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index 54d950d51f31758b..8ecd2842e20fef97 100644
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--- a/io/Makefile
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+++ b/io/Makefile
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@@ -188,6 +188,7 @@ tests := \
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tst-closefrom \
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tst-copy_file_range \
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tst-faccessat \
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+ tst-fchmod-errors \
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tst-fchmodat \
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tst-fchownat \
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tst-fcntl \
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diff --git a/io/tst-fchmod-errors.c b/io/tst-fchmod-errors.c
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new file mode 100644
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index 0000000000000000..ee15300fc3edf6f0
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--- /dev/null
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+++ b/io/tst-fchmod-errors.c
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@@ -0,0 +1,56 @@
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+/* 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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+
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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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+
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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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+
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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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+
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+#include <errno.h>
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+#include <fcntl.h>
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+#include <support/check.h>
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+#include <support/xunistd.h>
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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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+ {
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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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+ errno = 0;
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+ TEST_COMPARE (fchmod (fd, 0), -1);
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+ TEST_COMPARE (errno, EPERM);
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+ xclose (fd);
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+
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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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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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