1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2020 Cyril Hrubis <chrubis@suse.cz>
4 */
5
6/*\
7 * [Description]
8 *
9 * Test for a SHM_SET.
10 *
11 * The test clears the group and others bits from the shm_perm.mode and checks
12 * the result as well as if the ctime was updated correctly.
13 */
14
15#define _GNU_SOURCE
16#include <stdio.h>
17#include "tst_test.h"
18#include "tst_safe_sysv_ipc.h"
19#include "libnewipc.h"
20
21#define SHM_SIZE 2048
22
23static int shm_id = -1;
24
25static int test_ipc_set(struct shmid_ds *ds)
26{
27	TEST(shmctl(shm_id, IPC_SET, ds));
28
29	if (TST_RET != 0) {
30		tst_res(TFAIL, "shmctl(%i, IPC_SET, ...)", shm_id);
31		return 1;
32	}
33
34	tst_res(TPASS, "shmctl(%i, IPC_SET, {shm_perm.mode=%04o})",
35		shm_id, ds->shm_perm.mode);
36	return 0;
37}
38
39static void check_mode(struct shmid_ds *ds, short exp_mode)
40{
41	if (ds->shm_perm.mode == exp_mode) {
42		tst_res(TPASS, "shm_perm.mode=%04o", exp_mode);
43		return;
44	}
45
46	tst_res(TFAIL, "shm_perm.mode=%04o, expected %i",
47		ds->shm_perm.mode, exp_mode);
48}
49
50static void verify_shmset(void)
51{
52	struct shmid_ds ds;
53	unsigned short old_mode;
54	time_t old_ctime;
55
56	SAFE_SHMCTL(shm_id, IPC_STAT, &ds);
57
58	old_mode = ds.shm_perm.mode;
59	old_ctime = ds.shm_ctime;
60
61	check_mode(&ds, 0666);
62
63	sleep(1);
64
65	ds.shm_perm.mode &= ~0066;
66
67	if (test_ipc_set(&ds))
68		return;
69
70	memset(&ds, 0, sizeof(ds));
71	SAFE_SHMCTL(shm_id, IPC_STAT, &ds);
72	check_mode(&ds, old_mode & ~0066);
73
74	if (ds.shm_ctime <= old_ctime || ds.shm_ctime > old_ctime + 10) {
75		tst_res(TFAIL, "shm_ctime not updated old %li new %li",
76			(long)old_ctime, (long)ds.shm_ctime);
77	} else {
78		tst_res(TPASS, "shm_ctime updated correctly diff=%li",
79			(long)(ds.shm_ctime - old_ctime));
80	}
81
82	ds.shm_perm.mode = old_mode;
83	if (test_ipc_set(&ds))
84		return;
85
86	memset(&ds, 0, sizeof(ds));
87	SAFE_SHMCTL(shm_id, IPC_STAT, &ds);
88	check_mode(&ds, old_mode & MODE_MASK);
89}
90
91static void setup(void)
92{
93	shm_id = SAFE_SHMGET(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | 0666);
94}
95
96static void cleanup(void)
97{
98	if (shm_id >= 0)
99		SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
100}
101
102static struct tst_test test = {
103	.setup = setup,
104	.cleanup = cleanup,
105	.test_all = verify_shmset,
106};
107