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 #ifdef __FreeBSD__ 78 #include <sys/stat.h> 79 #endif 80 81 static long page = 0; 82 static const char path[] = "mincore"; 83 static size_t check_residency(void *, size_t); 84 85 static size_t 86 check_residency(void *addr, size_t npgs) 87 { 88 size_t i, resident; 89 char *vec; 90 91 vec = malloc(npgs); 92 93 ATF_REQUIRE(vec != NULL); 94 ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0); 95 96 for (i = resident = 0; i < npgs; i++) { 97 98 if (vec[i] != 0) 99 resident++; 100 101 #if 0 102 (void)fprintf(stderr, "page 0x%p is %sresident\n", 103 (char *)addr + (i * page), vec[i] ? "" : "not "); 104 #endif 105 } 106 107 free(vec); 108 109 return resident; 110 } 111 112 ATF_TC(mincore_err); 113 ATF_TC_HEAD(mincore_err, tc) 114 { 115 atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)"); 116 } 117 118 ATF_TC_BODY(mincore_err, tc) 119 { 120 char *map, *vec; 121 122 map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); 123 vec = malloc(page); 124 125 ATF_REQUIRE(vec != NULL); 126 ATF_REQUIRE(map != MAP_FAILED); 127 128 #ifdef __NetBSD__ 129 errno = 0; 130 ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1); 131 #endif 132 133 errno = 0; 134 ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1); 135 136 errno = 0; 137 ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1); 138 139 free(vec); 140 ATF_REQUIRE(munmap(map, page) == 0); 141 } 142 143 ATF_TC_WITH_CLEANUP(mincore_resid); 144 ATF_TC_HEAD(mincore_resid, tc) 145 { 146 atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)"); 147 #ifdef __FreeBSD__ 148 atf_tc_set_md_var(tc, "require.user", "root"); 149 #endif 150 } 151 152 ATF_TC_BODY(mincore_resid, tc) 153 { 154 void *addr, *addr2, *addr3, *buf; 155 size_t npgs = 0, resident; 156 struct stat st; 157 int fd, rv; 158 struct rlimit rlim; 159 160 ATF_REQUIRE(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0); 161 #ifdef __FreeBSD__ 162 /* 163 * Bump the mlock limit to unlimited so the rest of the testcase 164 * passes instead of failing on the mlock call. 165 */ 166 rlim.rlim_max = RLIM_INFINITY; 167 #endif 168 rlim.rlim_cur = rlim.rlim_max; 169 ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0); 170 171 (void)memset(&st, 0, sizeof(struct stat)); 172 173 fd = open(path, O_RDWR | O_CREAT, 0700); 174 buf = malloc(page * 5); 175 176 ATF_REQUIRE(fd >= 0); 177 ATF_REQUIRE(buf != NULL); 178 179 rv = write(fd, buf, page * 5); 180 ATF_REQUIRE(rv >= 0); 181 182 ATF_REQUIRE(fd >= 0); 183 ATF_REQUIRE(fstat(fd, &st) == 0); 184 185 addr = mmap(NULL, (size_t)st.st_size, PROT_READ, 186 MAP_FILE | MAP_SHARED, fd, (off_t) 0); 187 188 ATF_REQUIRE(addr != MAP_FAILED); 189 190 (void)close(fd); 191 192 npgs = st.st_size / page; 193 194 if (st.st_size % page != 0) 195 npgs++; 196 197 (void)check_residency(addr, npgs); 198 199 rv = mlock(addr, npgs * page); 200 if (rv == -1 && errno == EAGAIN) 201 atf_tc_skip("hit process resource limits"); 202 ATF_REQUIRE(munmap(addr, st.st_size) == 0); 203 204 npgs = 128; 205 206 #ifdef __FreeBSD__ 207 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 208 MAP_ANON | MAP_PRIVATE, -1, (off_t)0); 209 #else 210 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 211 MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0); 212 #endif 213 214 if (addr == MAP_FAILED) 215 atf_tc_skip("could not mmap wired anonymous test area, system " 216 "might be low on memory"); 217 218 #ifdef __FreeBSD__ 219 if (mlock(addr, npgs * page) == -1 && errno != ENOMEM) 220 atf_tc_skip("could not wire anonymous test area, system might " 221 "be low on memory"); 222 #endif 223 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 224 ATF_REQUIRE(munmap(addr, npgs * page) == 0); 225 226 npgs = 128; 227 228 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 229 MAP_ANON | MAP_PRIVATE, -1, (off_t)0); 230 231 ATF_REQUIRE(addr != MAP_FAILED); 232 233 /* 234 * Check that the in-core pages match the locked pages. 235 */ 236 ATF_REQUIRE(check_residency(addr, npgs) == 0); 237 238 errno = 0; 239 if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM) 240 atf_tc_fail("mlockall(2) failed"); 241 if (errno == ENOMEM) 242 atf_tc_skip("mlockall() exceeded process resource limits"); 243 244 resident = check_residency(addr, npgs); 245 if (resident < npgs) 246 atf_tc_fail("mlockall(MCL_FUTURE) succeeded, still only " 247 "%zu pages of the newly mapped %zu pages are resident", 248 resident, npgs); 249 250 addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0); 251 addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0); 252 253 if (addr2 == MAP_FAILED || addr3 == MAP_FAILED) 254 atf_tc_skip("could not mmap more anonymous test pages with " 255 "mlockall(MCL_FUTURE) in effect, system " 256 "might be low on memory"); 257 258 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 259 ATF_REQUIRE(check_residency(addr3, npgs) == 0); 260 ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0); 261 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 262 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 263 264 (void)munlockall(); 265 266 ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0); 267 #ifdef __NetBSD__ 268 ATF_REQUIRE(check_residency(addr2, npgs) == 0); 269 #endif 270 271 (void)memset(addr, 0, npgs * page); 272 273 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0); 274 #ifdef __NetBSD__ 275 ATF_REQUIRE(check_residency(addr, npgs) == 0); 276 #endif 277 278 (void)munmap(addr, npgs * page); 279 (void)munmap(addr2, npgs * page); 280 (void)munmap(addr3, npgs * page); 281 (void)unlink(path); 282 } 283 284 ATF_TC_CLEANUP(mincore_resid, tc) 285 { 286 (void)unlink(path); 287 } 288 289 ATF_TC(mincore_shmseg); 290 ATF_TC_HEAD(mincore_shmseg, tc) 291 { 292 atf_tc_set_md_var(tc, "descr", "residency of shared memory"); 293 } 294 295 ATF_TC_BODY(mincore_shmseg, tc) 296 { 297 size_t npgs = 128; 298 void *addr = NULL; 299 int shmid; 300 301 shmid = shmget(IPC_PRIVATE, npgs * page, 302 IPC_CREAT | S_IRUSR | S_IWUSR); 303 304 ATF_REQUIRE(shmid != -1); 305 306 addr = shmat(shmid, NULL, 0); 307 308 ATF_REQUIRE(addr != NULL); 309 ATF_REQUIRE(check_residency(addr, npgs) == 0); 310 311 (void)memset(addr, 0xff, npgs * page); 312 313 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 314 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0); 315 316 /* 317 * NOTE! Even though we have MADV_FREE'd the range, 318 * there is another reference (the kernel's) to the 319 * object which owns the pages. In this case, the 320 * kernel does not simply free the pages, as haphazardly 321 * freeing pages when there are still references to 322 * an object can cause data corruption (say, the other 323 * referencer doesn't expect the pages to be freed, 324 * and is surprised by the subsequent ZFOD). 325 * 326 * Because of this, we simply report the number of 327 * pages still resident, for information only. 328 */ 329 npgs = check_residency(addr, npgs); 330 331 (void)fprintf(stderr, "%zu pages still resident\n", npgs); 332 333 ATF_REQUIRE(shmdt(addr) == 0); 334 ATF_REQUIRE(shmctl(shmid, IPC_RMID, NULL) == 0); 335 } 336 337 ATF_TP_ADD_TCS(tp) 338 { 339 340 page = sysconf(_SC_PAGESIZE); 341 ATF_REQUIRE(page >= 0); 342 343 ATF_TP_ADD_TC(tp, mincore_err); 344 ATF_TP_ADD_TC(tp, mincore_resid); 345 ATF_TP_ADD_TC(tp, mincore_shmseg); 346 347 return atf_no_error(); 348 } 349