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 * The mmap() function shall fail if:
10 * [ENOMEM] MAP_FIXED was specified,
11 * and the range [addr,addr+len) exceeds that allowed
12 * for the address space of a process; or, if MAP_FIXED was not specified and
13 * there is insufficient room in the address space to effect the mapping.
14 *
15 * Test Step:
16 * 1. Map a shared memory object, with size exceeding the value get from
17 * rlim_cur of resource RLIMIT_AS, setting MAP_FIXED;
18 * 3. Should get ENOMEM.
19 */
20
21 #define _XOPEN_SOURCE 600
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <unistd.h>
25 #include <sys/mman.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <sys/resource.h>
29 #include <fcntl.h>
30 #include <string.h>
31 #include <errno.h>
32 #include "posixtest.h"
33
main(void)34 int main(void)
35 {
36 char tmpfname[256];
37 void *pa;
38 void *addr;
39 size_t len;
40 int fd;
41
42 /* Size of the shared memory object */
43 size_t shm_size;
44 struct rlimit rlim;
45 unsigned long page_size = sysconf(_SC_PAGE_SIZE);
46
47 shm_size = 2 * page_size;
48 snprintf(tmpfname, sizeof(tmpfname), "pts_mmap_24_2_%d", getpid());
49
50 /* Create shared object */
51 shm_unlink(tmpfname);
52 fd = shm_open(tmpfname, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
53 if (fd == -1) {
54 printf("Error at shm_open(): %s\n", strerror(errno));
55 return PTS_UNRESOLVED;
56 }
57 shm_unlink(tmpfname);
58 if (ftruncate(fd, shm_size) == -1) {
59 printf("Error at ftruncate(): %s\n", strerror(errno));
60 return PTS_UNRESOLVED;
61 }
62
63 /* Currentlly total available memory of this process, in bytes */
64 if (getrlimit(RLIMIT_AS, &rlim) == -1) {
65 printf("Error at getrlimit(): %s\n", strerror(errno));
66 return PTS_UNRESOLVED;
67 }
68 printf("available memory: %lu\n", rlim.rlim_cur);
69
70 /* First mmap, just to get a legal addr for second mmap */
71 len = shm_size;
72 pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
73 if (pa == MAP_FAILED) {
74 printf("Error at first mmap(): %s\n", strerror(errno));
75 exit(PTS_FAIL);
76 }
77
78 len = rlim.rlim_cur;
79 addr = pa;
80 printf("addr: %lx, len: %lx\n", (unsigned long)addr,
81 (unsigned long)len);
82 /* Make sure addr and len is aligned to page size */
83 if ((unsigned long)addr % page_size) {
84 /* Upper boundary */
85 addr += page_size;
86 addr = (void *)((unsigned long)addr & ~(page_size - 1));
87 }
88 if (len % page_size) {
89 /* Lower boundary */
90 len &= ~(page_size - 1);
91 }
92 printf("addr: %lx, len: %lx\n", (unsigned long)addr,
93 (unsigned long)len);
94 pa = mmap(addr, len, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, fd,
95 0);
96 if (pa == MAP_FAILED && errno == ENOMEM) {
97 printf("Got ENOMEM: %s\nTest PASSED\n", strerror(errno));
98 exit(PTS_PASS);
99 }
100
101 if (pa == MAP_FAILED)
102 perror("Error at mmap()");
103 else
104 munmap(pa, len);
105 close(fd);
106 printf("Test Fail: Did not get ENOMEM as expected\n");
107 return PTS_FAIL;
108 }
109