143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <syscall.h>
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#include <unistd.h>
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#include "../kselftest.h"
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int sys_fchmodat2(int dfd, const char *filename, mode_t mode, int flags)
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{
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int ret = syscall(__NR_fchmodat2, dfd, filename, mode, flags);
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return ret >= 0 ? ret : -errno;
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}
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int setup_testdir(void)
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{
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int dfd, ret;
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char dirname[] = "/tmp/ksft-fchmodat2.XXXXXX";
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/* Make the top-level directory. */
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if (!mkdtemp(dirname))
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ksft_exit_fail_msg("%s: failed to create tmpdir\n", __func__);
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dfd = open(dirname, O_PATH | O_DIRECTORY);
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if (dfd < 0)
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ksft_exit_fail_msg("%s: failed to open tmpdir\n", __func__);
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ret = openat(dfd, "regfile", O_CREAT | O_WRONLY | O_TRUNC, 0644);
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if (ret < 0)
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ksft_exit_fail_msg("%s: failed to create file in tmpdir\n",
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__func__);
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close(ret);
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ret = symlinkat("regfile", dfd, "symlink");
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if (ret < 0)
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ksft_exit_fail_msg("%s: failed to create symlink in tmpdir\n",
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__func__);
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return dfd;
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}
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int expect_mode(int dfd, const char *filename, mode_t expect_mode)
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{
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struct stat st;
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int ret = fstatat(dfd, filename, &st, AT_SYMLINK_NOFOLLOW);
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if (ret)
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ksft_exit_fail_msg("%s: %s: fstatat failed\n",
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__func__, filename);
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return (st.st_mode == expect_mode);
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}
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void test_regfile(void)
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{
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int dfd, ret;
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dfd = setup_testdir();
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ret = sys_fchmodat2(dfd, "regfile", 0640, 0);
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if (ret < 0)
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ksft_exit_fail_msg("%s: fchmodat2(noflag) failed\n", __func__);
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if (!expect_mode(dfd, "regfile", 0100640))
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ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2\n",
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__func__);
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ret = sys_fchmodat2(dfd, "regfile", 0600, AT_SYMLINK_NOFOLLOW);
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if (ret < 0)
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ksft_exit_fail_msg("%s: fchmodat2(AT_SYMLINK_NOFOLLOW) failed\n",
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__func__);
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if (!expect_mode(dfd, "regfile", 0100600))
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ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2 with nofollow\n",
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__func__);
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ksft_test_result_pass("fchmodat2(regfile)\n");
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}
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void test_symlink(void)
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{
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int dfd, ret;
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dfd = setup_testdir();
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ret = sys_fchmodat2(dfd, "symlink", 0640, 0);
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if (ret < 0)
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ksft_exit_fail_msg("%s: fchmodat2(noflag) failed\n", __func__);
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if (!expect_mode(dfd, "regfile", 0100640))
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ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2\n",
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__func__);
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if (!expect_mode(dfd, "symlink", 0120777))
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ksft_exit_fail_msg("%s: wrong symlink mode bits after fchmodat2\n",
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__func__);
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ret = sys_fchmodat2(dfd, "symlink", 0600, AT_SYMLINK_NOFOLLOW);
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/*
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* On certain filesystems (xfs or btrfs), chmod operation fails. So we
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* first check the symlink target but if the operation fails we mark the
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* test as skipped.
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*
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* https://sourceware.org/legacy-ml/libc-alpha/2020-02/msg00467.html
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*/
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if (ret == 0 && !expect_mode(dfd, "symlink", 0120600))
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ksft_exit_fail_msg("%s: wrong symlink mode bits after fchmodat2 with nofollow\n",
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__func__);
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if (!expect_mode(dfd, "regfile", 0100640))
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ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2 with nofollow\n",
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__func__);
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if (ret != 0)
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ksft_test_result_skip("fchmodat2(symlink)\n");
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else
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ksft_test_result_pass("fchmodat2(symlink)\n");
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}
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#define NUM_TESTS 2
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int main(int argc, char **argv)
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{
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ksft_print_header();
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ksft_set_plan(NUM_TESTS);
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test_regfile();
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test_symlink();
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if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0)
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ksft_exit_fail();
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else
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ksft_exit_pass();
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}
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