1 /*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * Copyright (c) 2012, Cyril Hrubis <chrubis@suse.cz>
4 *
5 * This file is licensed under the GPL license. For the full content
6 * of this license, see the COPYING file at the top level of this
7 * source tree.
8 *
9 * MPR References within the address range starting at pa and
10 * continuing for len bytes to whole pages following the end
11 * of an object shall result in delivery of a SIGBUS signal.
12 *
13 * Test Steps:
14 * 1. Map a shared memory object of size 1/2 * page_size,
15 * with len = 2 * page_size
16 * 2. If Memory Protection option is supported, read the second page
17 * beyond the end of the object, should get SIGBUS.
18 */
19
20
21 #include <sys/mman.h>
22 #include <sys/types.h>
23 #include <sys/stat.h>
24 #include <sys/wait.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <signal.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <unistd.h>
32 #include "posixtest.h"
33
34 #define WRITE(str) write(STDOUT_FILENO, str, sizeof(str) - 1)
35
sigbus_handler(int signum)36 void sigbus_handler(int signum)
37 {
38 if (signum == SIGBUS) {
39 WRITE("SIGBUS triggered\n");
40 WRITE("Test PASSED\n");
41 _exit(PTS_PASS);
42 }
43 }
44
main(void)45 int main(void)
46 {
47 #ifndef _POSIX_MEMORY_PROTECTION
48 printf("_POSIX_MEMORY_PROTECTION is not defined\n");
49 return PTS_UNTESTED;
50 #endif
51 char tmpfname[256];
52 long page_size;
53 long total_size;
54
55 void *pa;
56 size_t len;
57 int fd;
58
59 char *ch;
60
61 struct sigaction sa;
62
63 page_size = sysconf(_SC_PAGE_SIZE);
64
65 /* Size of the shared memory object to be mapped */
66 total_size = page_size / 2;
67
68 /* mmap will create a partial page */
69 len = page_size * 2;
70
71 sigfillset(&sa.sa_mask);
72 sa.sa_handler = sigbus_handler;
73 sigaction(SIGBUS, &sa, NULL);
74
75 snprintf(tmpfname, sizeof(tmpfname), "/pts_mmap_11_3_%d", getpid());
76 /* Create shared object */
77 shm_unlink(tmpfname);
78 fd = shm_open(tmpfname, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
79 if (fd == -1) {
80 printf("Error at shm_open(): %s\n", strerror(errno));
81 return PTS_UNRESOLVED;
82 }
83 shm_unlink(tmpfname);
84 if (ftruncate(fd, total_size) == -1) {
85 printf("Error at ftruncate(): %s\n", strerror(errno));
86 return PTS_UNRESOLVED;
87 }
88
89 pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
90 if (pa == MAP_FAILED) {
91 printf("Error at mmap(): %s\n", strerror(errno));
92 return PTS_FAIL;
93 }
94
95 ch = pa + page_size + 1;
96
97 /* This reference should trigger SIGBUS */
98 *ch = 0;
99
100 /* wait for a while */
101 sleep(1);
102
103 printf("Test FAILED: SIGBUS not triggered, "
104 "while Memory Protection is enabled\n");
105 return PTS_FAIL;
106 }
107