1 /* $NetBSD: t_mincore.c,v 1.8 2012/06/08 07:18:58 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*-
33 * Copyright (c) 1999 The NetBSD Foundation, Inc.
34 * All rights reserved.
35 *
36 * This code is derived from software contributed to The NetBSD Foundation
37 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
38 * NASA Ames Research Center.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
59 * POSSIBILITY OF SUCH DAMAGE.
60 */
61 #include <sys/cdefs.h>
62 __RCSID("$NetBSD: t_mincore.c,v 1.8 2012/06/08 07:18:58 martin Exp $");
63
64 #include <sys/mman.h>
65 #include <sys/shm.h>
66
67 #include <atf-c.h>
68 #include <errno.h>
69 #include <fcntl.h>
70 #include <kvm.h>
71 #include <stdio.h>
72 #include <stdlib.h>
73 #include <string.h>
74 #include <unistd.h>
75 #include <sys/resource.h>
76
77 static long page = 0;
78 static const char path[] = "mincore";
79 static size_t check_residency(void *, size_t);
80
81 static size_t
check_residency(void * addr,size_t npgs)82 check_residency(void *addr, size_t npgs)
83 {
84 size_t i, resident;
85 char *vec;
86
87 vec = malloc(npgs);
88
89 ATF_REQUIRE(vec != NULL);
90 ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0);
91
92 for (i = resident = 0; i < npgs; i++) {
93
94 if (vec[i] != 0)
95 resident++;
96
97 #if 0
98 (void)fprintf(stderr, "page 0x%p is %sresident\n",
99 (char *)addr + (i * page), vec[i] ? "" : "not ");
100 #endif
101 }
102
103 free(vec);
104
105 return resident;
106 }
107
108 ATF_TC(mincore_err);
ATF_TC_HEAD(mincore_err,tc)109 ATF_TC_HEAD(mincore_err, tc)
110 {
111 atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)");
112 }
113
ATF_TC_BODY(mincore_err,tc)114 ATF_TC_BODY(mincore_err, tc)
115 {
116 char *map, *vec;
117
118 map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
119 vec = malloc(page);
120
121 ATF_REQUIRE(vec != NULL);
122 ATF_REQUIRE(map != MAP_FAILED);
123
124 errno = 0;
125 ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1);
126
127 errno = 0;
128 ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1);
129
130 errno = 0;
131 ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1);
132
133 free(vec);
134 ATF_REQUIRE(munmap(map, page) == 0);
135 }
136
137 ATF_TC_WITH_CLEANUP(mincore_resid);
ATF_TC_HEAD(mincore_resid,tc)138 ATF_TC_HEAD(mincore_resid, tc)
139 {
140 atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)");
141 }
142
ATF_TC_BODY(mincore_resid,tc)143 ATF_TC_BODY(mincore_resid, tc)
144 {
145 void *addr, *addr2, *addr3, *buf;
146 size_t npgs = 0, resident;
147 struct stat st;
148 int fd, rv;
149 struct rlimit rlim;
150
151 ATF_REQUIRE(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
152 rlim.rlim_cur = rlim.rlim_max;
153 ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
154
155 (void)memset(&st, 0, sizeof(struct stat));
156
157 fd = open(path, O_RDWR | O_CREAT, 0700);
158 buf = malloc(page * 5);
159
160 ATF_REQUIRE(fd >= 0);
161 ATF_REQUIRE(buf != NULL);
162
163 rv = write(fd, buf, page * 5);
164 ATF_REQUIRE(rv >= 0);
165
166 ATF_REQUIRE(fd >= 0);
167 ATF_REQUIRE(fstat(fd, &st) == 0);
168
169 addr = mmap(NULL, (size_t)st.st_size, PROT_READ,
170 MAP_FILE | MAP_SHARED, fd, (off_t) 0);
171
172 ATF_REQUIRE(addr != MAP_FAILED);
173
174 (void)close(fd);
175
176 npgs = st.st_size / page;
177
178 if (st.st_size % page != 0)
179 npgs++;
180
181 (void)check_residency(addr, npgs);
182
183 rv = mlock(addr, npgs * page);
184 if (rv == -1 && errno == EAGAIN)
185 atf_tc_skip("hit process resource limits");
186 ATF_REQUIRE(munmap(addr, st.st_size) == 0);
187
188 npgs = 128;
189
190 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
191 MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0);
192
193 if (addr == MAP_FAILED)
194 atf_tc_skip("could not mmap wired anonymous test area, system "
195 "might be low on memory");
196
197 ATF_REQUIRE(check_residency(addr, npgs) == npgs);
198 ATF_REQUIRE(munmap(addr, npgs * page) == 0);
199
200 npgs = 128;
201
202 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
203 MAP_ANON | MAP_PRIVATE, -1, (off_t)0);
204
205 ATF_REQUIRE(addr != MAP_FAILED);
206
207 /*
208 * Check that the in-core pages match the locked pages.
209 */
210 ATF_REQUIRE(check_residency(addr, npgs) == 0);
211
212 errno = 0;
213 if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM)
214 atf_tc_fail("mlockall(2) failed");
215 if (errno == ENOMEM)
216 atf_tc_skip("mlockall() exceeded process resource limits");
217
218 resident = check_residency(addr, npgs);
219 if (resident < npgs)
220 atf_tc_fail("mlockall(MCL_FUTURE) succeeded, still only "
221 "%zu pages of the newly mapped %zu pages are resident",
222 resident, npgs);
223
224 addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0);
225 addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0);
226
227 if (addr2 == MAP_FAILED || addr3 == MAP_FAILED)
228 atf_tc_skip("could not mmap more anonymous test pages with "
229 "mlockall(MCL_FUTURE) in effect, system "
230 "might be low on memory");
231
232 ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
233 ATF_REQUIRE(check_residency(addr3, npgs) == 0);
234 ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0);
235 ATF_REQUIRE(check_residency(addr, npgs) == npgs);
236 ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
237
238 (void)munlockall();
239
240 ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0);
241 ATF_REQUIRE(check_residency(addr2, npgs) == 0);
242
243 (void)memset(addr, 0, npgs * page);
244
245 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
246 ATF_REQUIRE(check_residency(addr, npgs) == 0);
247
248 (void)munmap(addr, npgs * page);
249 (void)munmap(addr2, npgs * page);
250 (void)munmap(addr3, npgs * page);
251 (void)unlink(path);
252 }
253
ATF_TC_CLEANUP(mincore_resid,tc)254 ATF_TC_CLEANUP(mincore_resid, tc)
255 {
256 (void)unlink(path);
257 }
258
259 ATF_TC(mincore_shmseg);
ATF_TC_HEAD(mincore_shmseg,tc)260 ATF_TC_HEAD(mincore_shmseg, tc)
261 {
262 atf_tc_set_md_var(tc, "descr", "residency of shared memory");
263 }
264
ATF_TC_BODY(mincore_shmseg,tc)265 ATF_TC_BODY(mincore_shmseg, tc)
266 {
267 size_t npgs = 128;
268 void *addr = NULL;
269 int shmid;
270
271 shmid = shmget(IPC_PRIVATE, npgs * page,
272 IPC_CREAT | S_IRUSR | S_IWUSR);
273
274 ATF_REQUIRE(shmid != -1);
275
276 addr = shmat(shmid, NULL, 0);
277
278 ATF_REQUIRE(addr != NULL);
279 ATF_REQUIRE(check_residency(addr, npgs) == 0);
280
281 (void)memset(addr, 0xff, npgs * page);
282
283 ATF_REQUIRE(check_residency(addr, npgs) == npgs);
284 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
285
286 /*
287 * NOTE! Even though we have MADV_FREE'd the range,
288 * there is another reference (the kernel's) to the
289 * object which owns the pages. In this case, the
290 * kernel does not simply free the pages, as haphazardly
291 * freeing pages when there are still references to
292 * an object can cause data corruption (say, the other
293 * referencer doesn't expect the pages to be freed,
294 * and is surprised by the subsequent ZFOD).
295 *
296 * Because of this, we simply report the number of
297 * pages still resident, for information only.
298 */
299 npgs = check_residency(addr, npgs);
300
301 (void)fprintf(stderr, "%zu pages still resident\n", npgs);
302
303 ATF_REQUIRE(shmdt(addr) == 0);
304 ATF_REQUIRE(shmctl(shmid, IPC_RMID, NULL) == 0);
305 }
306
ATF_TP_ADD_TCS(tp)307 ATF_TP_ADD_TCS(tp)
308 {
309
310 page = sysconf(_SC_PAGESIZE);
311 ATF_REQUIRE(page >= 0);
312
313 ATF_TP_ADD_TC(tp, mincore_err);
314 ATF_TP_ADD_TC(tp, mincore_resid);
315 ATF_TP_ADD_TC(tp, mincore_shmseg);
316
317 return atf_no_error();
318 }
319