1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 *  03/2001 - Written by Wayne Boyer
5 */
6
7/*\
8 * [Description]
9 *
10 * Test for EACCES error.
11 *
12 * Create a shared memory segment without read or write permissions under
13 * unpriviledged user and call shmget() with SHM_RD/SHM_WR/SHM_RW flag to
14 * trigger EACCES error.
15 */
16#include <errno.h>
17#include <sys/types.h>
18#include <sys/ipc.h>
19#include <stdlib.h>
20#include <pwd.h>
21#include <sys/shm.h>
22#include "tst_safe_sysv_ipc.h"
23#include "tst_test.h"
24#include "libnewipc.h"
25#include "lapi/shm.h"
26
27static int shm_id = -1;
28static key_t shmkey;
29static struct tcase {
30	char *message;
31	int flag;
32} tcases[] = {
33	{"Testing SHM_RD flag", SHM_RD},
34	{"Testing SHM_WR flag", SHM_WR},
35	{"Testing SHM_RW flag", SHM_RW},
36};
37
38static void verify_shmget(unsigned int n)
39{
40	struct tcase *tc = &tcases[n];
41
42	tst_res(TINFO, "%s", tc->message);
43	TST_EXP_FAIL2(shmget(shmkey, SHM_SIZE, tc->flag), EACCES, "shmget(%i, %i, %i)",
44		shmkey, SHM_SIZE, tc->flag);
45}
46
47static void setup(void)
48{
49	struct passwd *pw;
50
51	pw = SAFE_GETPWNAM("nobody");
52	SAFE_SETUID(pw->pw_uid);
53	shmkey = GETIPCKEY();
54
55	shm_id = SAFE_SHMGET(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL);
56}
57
58static void cleanup(void)
59{
60	if (shm_id >= 0)
61		SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
62}
63
64static struct tst_test test = {
65	.needs_tmpdir = 1,
66	.needs_root = 1,
67	.setup = setup,
68	.cleanup = cleanup,
69	.test = verify_shmget,
70	.tcnt = ARRAY_SIZE(tcases),
71};
72