1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2004
4 * Copyright (c) Linux Test Project, 2004-2017
5 */
6
7 /*
8 * DESCRIPTION
9 * hugeshmctl03 - check for EACCES, and EPERM errors
10 *
11 * ALGORITHM
12 * create a large shared memory segment with root only read & write
13 * permissions fork a child process
14 * if child
15 * set the ID of the child process to that of "ltpuser1"
16 * call do_child()
17 * loop if that option was specified
18 * call shmctl() using three different invalid cases
19 * check the errno value
20 * issue a PASS message if we get EACCES or EPERM
21 * otherwise, the tests fails
22 * issue a FAIL message
23 * call cleanup
24 * if parent
25 * wait for child to exit
26 * remove the large shared memory segment
27 *
28 * HISTORY
29 * 03/2001 - Written by Wayne Boyer
30 * 04/2004 - Updated by Robbie Williamson
31 *
32 * RESTRICTIONS
33 * test must be run as root
34 */
35
36 #include <sys/types.h>
37 #include <sys/wait.h>
38 #include <limits.h>
39 #include "hugetlb.h"
40
41 static size_t shm_size;
42 static int shm_id_1 = -1;
43 static struct shmid_ds buf;
44 static uid_t ltp_uid;
45 static char *ltp_user = "nobody";
46
47 static struct tst_option options[] = {
48 {"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
49 {NULL, NULL, NULL}
50 };
51
52 struct tcase {
53 int *shmid;
54 int cmd;
55 struct shmid_ds *sbuf;
56 int error;
57 } tcases[] = {
58 /* EACCES - child has no read permission for segment */
59 {&shm_id_1, IPC_STAT, &buf, EACCES},
60 /* EPERM - IPC_SET - child doesn't have permission to change segment */
61 {&shm_id_1, IPC_SET, &buf, EPERM},
62 /* EPERM - IPC_RMID - child can not remove the segment */
63 {&shm_id_1, IPC_RMID, &buf, EPERM},
64 };
65
66 static void do_child(void);
67
test_hugeshmctl(void)68 static void test_hugeshmctl(void)
69 {
70 pid_t pid;
71 int status;
72
73 switch (pid = SAFE_FORK()) {
74 case 0:
75 /* set the user ID of the child to the non root user */
76 SAFE_SETUID(ltp_uid);
77 do_child();
78 exit(0);
79 default:
80 SAFE_WAITPID(pid, &status, 0);
81 }
82 }
83
do_child(void)84 static void do_child(void)
85 {
86 unsigned int i;
87
88 for (i = 0; i < ARRAY_SIZE(tcases); i++) {
89 TEST(shmctl(*(tcases[i].shmid), tcases[i].cmd, tcases[i].sbuf));
90 if (TST_RET != -1) {
91 tst_res(TFAIL, "shmctl succeeded "
92 "unexpectedly");
93 continue;
94 }
95 if (TST_ERR == tcases[i].error)
96 tst_res(TPASS | TTERRNO, "shmctl failed "
97 "as expected");
98 else
99 tst_res(TFAIL | TTERRNO, "shmctl failed "
100 "unexpectedly - expect errno = "
101 "%d, got", tcases[i].error);
102 }
103 }
104
setup(void)105 void setup(void)
106 {
107 long hpage_size;
108
109 if (tst_hugepages == 0)
110 tst_brk(TCONF, "No enough hugepages for testing.");
111
112 hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
113
114 shm_size = hpage_size * tst_hugepages / 2;
115 update_shm_size(&shm_size);
116 shmkey = getipckey();
117 shm_id_1 = shmget(shmkey, shm_size,
118 SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW);
119 if (shm_id_1 == -1)
120 tst_brk(TBROK | TERRNO, "shmget");
121
122 /* get the userid for a non root user */
123 ltp_uid = getuserid(ltp_user);
124 }
125
cleanup(void)126 void cleanup(void)
127 {
128 rm_shm(shm_id_1);
129 }
130
131 static struct tst_test test = {
132 .needs_root = 1,
133 .forks_child = 1,
134 .needs_tmpdir = 1,
135 .options = options,
136 .setup = setup,
137 .cleanup = cleanup,
138 .test_all = test_hugeshmctl,
139 .request_hugepages = 128,
140 };
141