1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2022 Petr Vorel <[email protected]>
4 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
5 * Author: Madhu T L <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Verify that syslog(2) system call fails with appropriate error number:
12 *
13 * 1. EINVAL -- invalid type/command
14 * 2. EFAULT -- buffer outside program's accessible address space
15 * 3. EINVAL -- NULL buffer argument
16 * 4. EINVAL -- length argument set to negative value
17 * 5. EINVAL -- console level less than 0
18 * 6. EINVAL -- console level greater than 8
19 * 7. EPERM -- non-root user
20 */
21
22 #include <errno.h>
23 #include <pwd.h>
24
25 #include "tst_test.h"
26 #include "lapi/syscalls.h"
27 #include "tst_safe_macros.h"
28
29 #define syslog(arg1, arg2, arg3) tst_syscall(__NR_syslog, arg1, arg2, arg3)
30
31 static char buf;
32 static struct passwd *ltpuser;
33
setup(void)34 static void setup(void)
35 {
36 ltpuser = SAFE_GETPWNAM("nobody");
37 }
38
setup_nonroot(void)39 static void setup_nonroot(void)
40 {
41 SAFE_SETEGID(ltpuser->pw_gid);
42 SAFE_SETEUID(ltpuser->pw_uid);
43 }
44
cleanup_nonroot(void)45 static void cleanup_nonroot(void)
46 {
47 SAFE_SETEUID(0);
48 }
49
50 static struct tcase {
51 int type;
52 char *buf;
53 int len;
54 int exp_errno;
55 char *desc;
56 } tcases[] = {
57 {100, &buf, 0, EINVAL, "invalid type/command"},
58 {2, NULL, 0, EINVAL, "NULL buffer argument"},
59 {3, &buf, -1, EINVAL, "negative length argument"},
60 {8, &buf, -1, EINVAL, "console level less than 0"},
61 {8, &buf, 9, EINVAL, "console level greater than 8"},
62 {2, &buf, 0, EPERM, "non-root user"},
63 };
64
run(unsigned int n)65 static void run(unsigned int n)
66 {
67 struct tcase *tc = &tcases[n];
68
69 if (n == ARRAY_SIZE(tcases)-1)
70 setup_nonroot();
71
72 TST_EXP_FAIL(syslog(tc->type, tc->buf, tc->len), tc->exp_errno,
73 "syslog() with %s", tc->desc);
74
75 if (n == ARRAY_SIZE(tcases)-1)
76 cleanup_nonroot();
77 }
78
79 static struct tst_test test = {
80 .test = run,
81 .setup = setup,
82 .needs_root = 1,
83 .tcnt = ARRAY_SIZE(tcases),
84 };
85