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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 
23 static int shm_id = -1;
24 
test_ipc_set(struct shmid_ds * ds)25 static 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 
check_mode(struct shmid_ds * ds,short exp_mode)39 static 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 
verify_shmset(void)50 static 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 
setup(void)91 static void setup(void)
92 {
93 	shm_id = SAFE_SHMGET(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | 0666);
94 }
95 
cleanup(void)96 static void cleanup(void)
97 {
98 	if (shm_id >= 0)
99 		SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
100 }
101 
102 static struct tst_test test = {
103 	.setup = setup,
104 	.cleanup = cleanup,
105 	.test_all = verify_shmset,
106 };
107