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 * Test for EEXIST, ENOENT, EACCES errors.
10 *
11 * 1) msgget(2) fails if a message queue exists for key and msgflg
12 * specified both IPC_CREAT and IPC_EXCL.
13 * 2) msgget(2) fails if no message queue exists for key and msgflg
14 * did not specify IPC_CREAT.
15 * 3) msgget(2) fails if a message queue exists for key, but the
16 * calling process does not have permission to access the queue,
17 * and does not have the CAP_IPC_OWNER capability.
18 *
19 */
20 #include <errno.h>
21 #include <stdlib.h>
22 #include <sys/types.h>
23 #include <sys/ipc.h>
24 #include <sys/msg.h>
25 #include <pwd.h>
26
27 #include "tst_test.h"
28 #include "tst_safe_sysv_ipc.h"
29 #include "libnewipc.h"
30
31 static key_t msgkey, msgkey1;
32 static int queue_id = -1;
33 static struct passwd *pw;
34
35 static struct tcase {
36 int *key;
37 int flags;
38 int exp_err;
39 /*1: nobody expected 0: root expected */
40 int exp_user;
41 } tcases[] = {
42 {&msgkey, IPC_CREAT | IPC_EXCL, EEXIST, 0},
43 {&msgkey1, IPC_PRIVATE, ENOENT, 0},
44 {&msgkey1, IPC_EXCL, ENOENT, 0},
45 {&msgkey, MSG_RD, EACCES, 1},
46 {&msgkey, MSG_WR, EACCES, 1},
47 {&msgkey, MSG_RW, EACCES, 1}
48 };
49
verify_msgget(struct tcase * tc)50 static void verify_msgget(struct tcase *tc)
51 {
52 TST_EXP_FAIL2(msgget(*tc->key, tc->flags), tc->exp_err, "msgget(%i, %i)",
53 *tc->key, tc->flags);
54 }
55
do_test(unsigned int n)56 static void do_test(unsigned int n)
57 {
58 pid_t pid;
59 struct tcase *tc = &tcases[n];
60
61 if (tc->exp_user == 0) {
62 verify_msgget(tc);
63 } else {
64 pid = SAFE_FORK();
65 if (pid) {
66 tst_reap_children();
67 } else {
68 SAFE_SETUID(pw->pw_uid);
69 verify_msgget(tc);
70 exit(0);
71 }
72 }
73 }
74
setup(void)75 static void setup(void)
76 {
77 msgkey = GETIPCKEY();
78 msgkey1 = GETIPCKEY();
79
80 queue_id = SAFE_MSGGET(msgkey, IPC_CREAT | IPC_EXCL);
81
82 pw = SAFE_GETPWNAM("nobody");
83 }
84
cleanup(void)85 static void cleanup(void)
86 {
87 if (queue_id != -1)
88 SAFE_MSGCTL(queue_id, IPC_RMID, NULL);
89 }
90
91 static struct tst_test test = {
92 .needs_tmpdir = 1,
93 .needs_root = 1,
94 .forks_child = 1,
95 .tcnt = ARRAY_SIZE(tcases),
96 .setup = setup,
97 .cleanup = cleanup,
98 .test = do_test
99 };
100