1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) Linux Test Project, 2001-2022
4 * Copyright (c) International Business Machines Corp., 2001
5 * 07/2001 John George
6 */
7
8 /*\
9 * [Description]
10 *
11 * Verify that:
12 *
13 * - truncate(2) returns -1 and sets errno to EACCES if search/write
14 * permission denied for the process on the component of the path prefix
15 * or named file.
16 * - truncate(2) returns -1 and sets errno to ENOTDIR if the component of
17 * the path prefix is not a directory.
18 * - truncate(2) returns -1 and sets errno to EFAULT if pathname points
19 * outside user's accessible address space.
20 * - truncate(2) returns -1 and sets errno to ENAMETOOLONG if the component
21 * of a pathname exceeded 255 characters or entire pathname exceeds 1023
22 * characters.
23 * - truncate(2) returns -1 and sets errno to ENOENT if the named file
24 * does not exist.
25 * - truncate(2) returns -1 and sets errno to EISDIR if the named file
26 * is a directory.
27 * - truncate(2) returns -1 and sets errno to EFBIG if the argument length
28 * is larger than the maximum file size.
29 * - truncate(2) returns -1 and sets errno to ELOOP if too many symbolic
30 * links were encountered in translating the pathname.
31 */
32
33 #define _GNU_SOURCE
34
35 #include <stdio.h>
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <fcntl.h>
39 #include <sys/mman.h>
40 #include <errno.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <pwd.h>
44 #include <sys/resource.h>
45
46 #include "tst_test.h"
47
48 #define TEST_FILE1 "testfile"
49 #define TEST_FILE2 "t_file/testfile"
50 #define TEST_FILE3 "testfile3"
51 #define TEST_SYM1 "testsymlink1"
52 #define TEST_SYM2 "testsymlink2"
53 #define TEST_DIR1 "testdir"
54 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
55 #define NEW_MODE S_IRUSR | S_IRGRP | S_IROTH
56 #define DIR_MODE S_IRWXU
57 #define TRUNC_LEN 256
58 #define MAX_FSIZE (16*1024*1024)
59
60 static char long_pathname[PATH_MAX + 2];
61
62 static struct test_case_t {
63 char *pathname;
64 off_t length;
65 int exp_errno;
66 } test_cases[] = {
67 { TEST_FILE1, TRUNC_LEN, EACCES },
68 { TEST_FILE2, TRUNC_LEN, ENOTDIR },
69 { NULL, TRUNC_LEN, EFAULT },
70 { long_pathname, TRUNC_LEN, ENAMETOOLONG },
71 { "", TRUNC_LEN, ENOENT },
72 { TEST_DIR1, TRUNC_LEN, EISDIR },
73 { TEST_FILE3, MAX_FSIZE*2, EFBIG },
74 { TEST_SYM1, TRUNC_LEN, ELOOP }
75 };
76
setup(void)77 static void setup(void)
78 {
79 struct passwd *ltpuser;
80 struct rlimit rlim = {
81 .rlim_cur = MAX_FSIZE,
82 .rlim_max = MAX_FSIZE,
83 };
84 sigset_t signalset;
85 unsigned int n;
86
87 ltpuser = SAFE_GETPWNAM("nobody");
88 SAFE_SETEUID(ltpuser->pw_uid);
89
90 SAFE_TOUCH(TEST_FILE1, NEW_MODE, NULL);
91
92 SAFE_TOUCH("t_file", FILE_MODE, NULL);
93
94 memset(long_pathname, 'a', PATH_MAX + 1);
95
96 SAFE_MKDIR(TEST_DIR1, DIR_MODE);
97
98 SAFE_TOUCH(TEST_FILE3, FILE_MODE, NULL);
99
100 SAFE_SYMLINK(TEST_SYM1, TEST_SYM2);
101 SAFE_SYMLINK(TEST_SYM2, TEST_SYM1);
102
103 SAFE_SETRLIMIT(RLIMIT_FSIZE, &rlim);
104
105 SAFE_SIGEMPTYSET(&signalset);
106 SAFE_SIGADDSET(&signalset, SIGXFSZ);
107 SAFE_SIGPROCMASK(SIG_BLOCK, &signalset, NULL);
108
109 for (n = 0; n < ARRAY_SIZE(test_cases); n++) {
110 if (!test_cases[n].pathname)
111 test_cases[n].pathname = tst_get_bad_addr(NULL);
112 }
113
114 }
115
verify_truncate(unsigned int n)116 static void verify_truncate(unsigned int n)
117 {
118 struct test_case_t *tc = &test_cases[n];
119
120 TST_EXP_FAIL(truncate(tc->pathname, tc->length), tc->exp_errno);
121 }
122
123 static struct tst_test test = {
124 .needs_root = 1,
125 .needs_tmpdir = 1,
126 .setup = setup,
127 .tcnt = ARRAY_SIZE(test_cases),
128 .test = verify_truncate,
129 };
130