1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6 /*\
7 * [Description]
8 *
9 * This case check whether we get SIGSEGV when write a value to a detached
10 * shared memory resource.
11 */
12
13 #include <sys/types.h>
14 #include <sys/ipc.h>
15 #include <sys/shm.h>
16 #include <setjmp.h>
17 #include "tst_test.h"
18 #include "libnewipc.h"
19 #include "tst_safe_sysv_ipc.h"
20
21 static int shm_id = -1, shm_key, pass;
22 static int *shared;
23 static sigjmp_buf env;
24
sighandler(int sig LTP_ATTRIBUTE_UNUSED)25 static void sighandler(int sig LTP_ATTRIBUTE_UNUSED)
26 {
27 pass = 1;
28 siglongjmp(env, 1);
29 }
30
check_functionality(void)31 static void check_functionality(void)
32 {
33 struct shmid_ds buf;
34
35 SAFE_SHMCTL(shm_id, IPC_STAT, &buf);
36 TST_EXP_EQ_LI(buf.shm_nattch, 0);
37 if (buf.shm_nattch)
38 return;
39
40 if (sigsetjmp(env, 1) == 0)
41 *shared = 2;
42
43 if (pass)
44 tst_res(TPASS, "shared memory detached correctly");
45 else
46 tst_res(TFAIL, "shared memory was not detached correctly");
47 }
48
verify_shmdt(void)49 static void verify_shmdt(void)
50 {
51 TST_EXP_PASS_SILENT(shmdt(shared));
52 if (TST_PASS) {
53 check_functionality();
54 shared = SAFE_SHMAT(shm_id, 0, 0);
55 }
56
57 pass = 0;
58 }
59
setup(void)60 static void setup(void)
61 {
62 shm_key = GETIPCKEY();
63 shm_id = SAFE_SHMGET(shm_key, INT_SIZE, SHM_RW | IPC_CREAT | IPC_EXCL);
64
65 SAFE_SIGNAL(SIGSEGV, sighandler);
66 shared = SAFE_SHMAT(shm_id, 0, 0);
67 }
68
cleanup(void)69 static void cleanup(void)
70 {
71 if (shm_id != -1)
72 SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
73 }
74
75 static struct tst_test test = {
76 .needs_tmpdir = 1,
77 .needs_root = 1,
78 .setup = setup,
79 .cleanup = cleanup,
80 .test_all = verify_shmdt,
81 };
82