Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | // SPDX-License-Identifier: GPL-2.0-or-later #define _GNU_SOURCE #include <fcntl.h> #include <sys/stat.h> #include <sys/types.h> #include <syscall.h> #include <unistd.h> #include "../kselftest.h" int sys_fchmodat2(int dfd, const char *filename, mode_t mode, int flags) { int ret = syscall(__NR_fchmodat2, dfd, filename, mode, flags); return ret >= 0 ? ret : -errno; } int setup_testdir(void) { int dfd, ret; char dirname[] = "/tmp/ksft-fchmodat2.XXXXXX"; /* Make the top-level directory. */ if (!mkdtemp(dirname)) ksft_exit_fail_msg("%s: failed to create tmpdir\n", __func__); dfd = open(dirname, O_PATH | O_DIRECTORY); if (dfd < 0) ksft_exit_fail_msg("%s: failed to open tmpdir\n", __func__); ret = openat(dfd, "regfile", O_CREAT | O_WRONLY | O_TRUNC, 0644); if (ret < 0) ksft_exit_fail_msg("%s: failed to create file in tmpdir\n", __func__); close(ret); ret = symlinkat("regfile", dfd, "symlink"); if (ret < 0) ksft_exit_fail_msg("%s: failed to create symlink in tmpdir\n", __func__); return dfd; } int expect_mode(int dfd, const char *filename, mode_t expect_mode) { struct stat st; int ret = fstatat(dfd, filename, &st, AT_SYMLINK_NOFOLLOW); if (ret) ksft_exit_fail_msg("%s: %s: fstatat failed\n", __func__, filename); return (st.st_mode == expect_mode); } void test_regfile(void) { int dfd, ret; dfd = setup_testdir(); ret = sys_fchmodat2(dfd, "regfile", 0640, 0); if (ret < 0) ksft_exit_fail_msg("%s: fchmodat2(noflag) failed\n", __func__); if (!expect_mode(dfd, "regfile", 0100640)) ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2\n", __func__); ret = sys_fchmodat2(dfd, "regfile", 0600, AT_SYMLINK_NOFOLLOW); if (ret < 0) ksft_exit_fail_msg("%s: fchmodat2(AT_SYMLINK_NOFOLLOW) failed\n", __func__); if (!expect_mode(dfd, "regfile", 0100600)) ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2 with nofollow\n", __func__); ksft_test_result_pass("fchmodat2(regfile)\n"); } void test_symlink(void) { int dfd, ret; dfd = setup_testdir(); ret = sys_fchmodat2(dfd, "symlink", 0640, 0); if (ret < 0) ksft_exit_fail_msg("%s: fchmodat2(noflag) failed\n", __func__); if (!expect_mode(dfd, "regfile", 0100640)) ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2\n", __func__); if (!expect_mode(dfd, "symlink", 0120777)) ksft_exit_fail_msg("%s: wrong symlink mode bits after fchmodat2\n", __func__); ret = sys_fchmodat2(dfd, "symlink", 0600, AT_SYMLINK_NOFOLLOW); /* * On certain filesystems (xfs or btrfs), chmod operation fails. So we * first check the symlink target but if the operation fails we mark the * test as skipped. * * https://sourceware.org/legacy-ml/libc-alpha/2020-02/msg00467.html */ if (ret == 0 && !expect_mode(dfd, "symlink", 0120600)) ksft_exit_fail_msg("%s: wrong symlink mode bits after fchmodat2 with nofollow\n", __func__); if (!expect_mode(dfd, "regfile", 0100640)) ksft_exit_fail_msg("%s: wrong file mode bits after fchmodat2 with nofollow\n", __func__); if (ret != 0) ksft_test_result_skip("fchmodat2(symlink)\n"); else ksft_test_result_pass("fchmodat2(symlink)\n"); } #define NUM_TESTS 2 int main(int argc, char **argv) { ksft_print_header(); ksft_set_plan(NUM_TESTS); test_regfile(); test_symlink(); if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0) ksft_exit_fail(); else ksft_exit_pass(); } |