hugeshmget05.c revision 676746ed5fc3c897c2018c310d0fb72dabd18d8c 
1/*
2 *
3 *   Copyright (c) International Business Machines  Corp., 2004
4 *
5 *   This program is free software;  you can redistribute it and/or modify
6 *   it under the terms of the GNU General Public License as published by
7 *   the Free Software Foundation; either version 2 of the License, or
8 *   (at your option) any later version.
9 *
10 *   This program is distributed in the hope that it will be useful,
11 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13 *   the GNU General Public License for more details.
14 *
15 *   You should have received a copy of the GNU General Public License
16 *   along with this program;  if not, write to the Free Software
17 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20/*
21 * NAME
22 *	hugeshmget05.c
23 *
24 * DESCRIPTION
25 *	hugeshmget05 - test for EACCES error
26 *
27 * ALGORITHM
28 *	create a large shared memory segment with root only read & write
29 *		permissions
30 *	fork a child process
31 *	if child
32 *	  set the ID of the child process to that of "nobody"
33 *	  loop if that option was specified
34 *	    call shmget() using the TEST() macro
35 *	    check the errno value
36 *	      issue a PASS message if we get EACCES
37 *	    otherwise, the tests fails
38 *	      issue a FAIL message
39 *	  call cleanup
40 *	if parent
41 *	  wait for child to exit
42 *	  remove the shared memory segment
43 *
44 * USAGE:  <for command-line>
45 *  hugeshmget05 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
46 *     where,  -c n : Run n copies concurrently.
47 *             -e   : Turn on errno logging.
48 *	       -i n : Execute test n times.
49 *	       -I x : Execute test for x seconds.
50 *	       -P x : Pause for x seconds between iterations.
51 *	       -t   : Turn on syscall timing.
52 *
53 * HISTORY
54 *	03/2001 - Written by Wayne Boyer
55 *	04/2004 - Updated by Robbie Williamson
56 *
57 * RESTRICTIONS
58 *	test must be run at root
59 */
60
61#include <sys/types.h>
62#include <sys/wait.h>
63#include "hugetlb.h"
64#include "safe_macros.h"
65#include "mem.h"
66
67char *TCID = "hugeshmget05";
68int TST_TOTAL = 1;
69
70static size_t shm_size;
71static int shm_id_1 = -1;
72static uid_t ltp_uid;
73static char *ltp_user = "nobody";
74
75static long hugepages = 128;
76static option_t options[] = {
77	{"s:", &sflag, &nr_opt},
78	{NULL, NULL, NULL}
79};
80
81static void do_child(void);
82
83int main(int ac, char **av)
84{
85	pid_t pid;
86	int status;
87
88	tst_parse_opts(ac, av, options, &help);
89
90	if (sflag)
91		hugepages = SAFE_STRTOL(NULL, nr_opt, 0, LONG_MAX);
92
93	setup();
94
95	switch (pid = fork()) {
96	case -1:
97		tst_brkm(TBROK | TERRNO, cleanup, "fork");
98	case 0:
99		/* set the user ID of the child to the non root user */
100		if (setuid(ltp_uid) == -1)
101			tst_brkm(TBROK | TERRNO, cleanup, "setuid");
102		do_child();
103		tst_exit();
104	default:
105		/* wait for the child to return */
106		if (waitpid(pid, &status, 0) == -1)
107			tst_brkm(TBROK | TERRNO, cleanup, "waitpid");
108	}
109	cleanup();
110	tst_exit();
111}
112
113static void do_child(void)
114{
115	int lc;
116
117	for (lc = 0; TEST_LOOPING(lc); lc++) {
118		tst_count = 0;
119
120		TEST(shmget(shmkey, shm_size, SHM_HUGETLB | SHM_RW));
121		if (TEST_RETURN != -1) {
122			tst_resm(TFAIL, "shmget succeeded unexpectedly");
123			continue;
124		}
125		if (TEST_ERRNO == EACCES)
126			tst_resm(TPASS | TTERRNO, "shmget failed as expected");
127		else
128			tst_resm(TFAIL | TTERRNO, "shmget failed unexpectedly "
129				 "- expect errno=EACCES, got");
130	}
131}
132
133void setup(void)
134{
135	long hpage_size;
136
137	tst_require_root();
138	tst_sig(FORK, DEF_HANDLER, cleanup);
139	tst_tmpdir();
140
141	orig_hugepages = get_sys_tune("nr_hugepages");
142	set_sys_tune("nr_hugepages", hugepages, 1);
143	hpage_size = read_meminfo("Hugepagesize:") * 1024;
144
145	shm_size = hpage_size * hugepages / 2;
146	update_shm_size(&shm_size);
147	shmkey = getipckey();
148	shm_id_1 = shmget(shmkey, shm_size,
149			  SHM_HUGETLB | SHM_RW | IPC_CREAT | IPC_EXCL);
150	if (shm_id_1 == -1)
151		tst_brkm(TBROK | TERRNO, cleanup, "shmget #setup");
152
153	/* get the userid for a non-root user */
154	ltp_uid = getuserid(ltp_user);
155
156	TEST_PAUSE;
157}
158
159void cleanup(void)
160{
161	rm_shm(shm_id_1);
162
163	set_sys_tune("nr_hugepages", orig_hugepages, 0);
164
165	tst_rmdir();
166}
167