1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2022 Petr Vorel <pvorel@suse.cz>
4 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
5 * Author: Madhu T L <madhu.tarikere@wipro.com>
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
31static char buf;
32static struct passwd *ltpuser;
33
34static void setup(void)
35{
36	ltpuser = SAFE_GETPWNAM("nobody");
37}
38
39static void setup_nonroot(void)
40{
41	SAFE_SETEGID(ltpuser->pw_gid);
42	SAFE_SETEUID(ltpuser->pw_uid);
43}
44
45static void cleanup_nonroot(void)
46{
47	SAFE_SETEUID(0);
48}
49
50static 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
65static 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
79static struct tst_test test = {
80	.test = run,
81	.setup = setup,
82	.needs_root = 1,
83	.tcnt = ARRAY_SIZE(tcases),
84};
85