1 /* $NetBSD: t_mincore.c,v 1.9 2017/01/10 22:36:29 christos 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 1.9 2017/01/10 22:36:29 christos Exp $"); 63 64 #include <sys/mman.h> 65 #include <sys/stat.h> 66 #include <sys/shm.h> 67 68 #include <atf-c.h> 69 #include <errno.h> 70 #include <fcntl.h> 71 #include <kvm.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <unistd.h> 76 #include <sys/resource.h> 77 78 static long page = 0; 79 static const char path[] = "mincore"; 80 static size_t check_residency(void *, size_t); 81 82 static size_t 83 check_residency(void *addr, size_t npgs) 84 { 85 size_t i, resident; 86 char *vec; 87 88 vec = malloc(npgs); 89 90 ATF_REQUIRE(vec != NULL); 91 ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0); 92 93 for (i = resident = 0; i < npgs; i++) { 94 95 if (vec[i] != 0) 96 resident++; 97 98 #if 0 99 (void)fprintf(stderr, "page 0x%p is %sresident\n", 100 (char *)addr + (i * page), vec[i] ? "" : "not "); 101 #endif 102 } 103 104 free(vec); 105 106 return resident; 107 } 108 109 ATF_TC(mincore_err); 110 ATF_TC_HEAD(mincore_err, tc) 111 { 112 atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)"); 113 } 114 115 ATF_TC_BODY(mincore_err, tc) 116 { 117 char *map, *vec; 118 119 map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); 120 vec = malloc(page); 121 122 ATF_REQUIRE(vec != NULL); 123 ATF_REQUIRE(map != MAP_FAILED); 124 125 #ifdef __NetBSD__ 126 errno = 0; 127 ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1); 128 #endif 129 130 errno = 0; 131 ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1); 132 133 errno = 0; 134 ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1); 135 136 free(vec); 137 ATF_REQUIRE(munmap(map, page) == 0); 138 } 139 140 ATF_TC_WITH_CLEANUP(mincore_resid); 141 ATF_TC_HEAD(mincore_resid, tc) 142 { 143 atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)"); 144 #ifdef __FreeBSD__ 145 atf_tc_set_md_var(tc, "require.user", "root"); 146 #endif 147 } 148 149 ATF_TC_BODY(mincore_resid, tc) 150 { 151 void *addr, *addr2, *addr3, *buf; 152 size_t npgs = 0, resident; 153 struct stat st; 154 int fd, rv; 155 struct rlimit rlim; 156 157 ATF_REQUIRE(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0); 158 #ifdef __FreeBSD__ 159 /* 160 * Bump the mlock limit to unlimited so the rest of the testcase 161 * passes instead of failing on the mlock call. 162 */ 163 rlim.rlim_max = RLIM_INFINITY; 164 #endif 165 rlim.rlim_cur = rlim.rlim_max; 166 ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0); 167 168 (void)memset(&st, 0, sizeof(struct stat)); 169 170 fd = open(path, O_RDWR | O_CREAT, 0700); 171 buf = malloc(page * 5); 172 173 ATF_REQUIRE(fd >= 0); 174 ATF_REQUIRE(buf != NULL); 175 176 rv = write(fd, buf, page * 5); 177 ATF_REQUIRE(rv >= 0); 178 179 ATF_REQUIRE(fd >= 0); 180 ATF_REQUIRE(fstat(fd, &st) == 0); 181 182 addr = mmap(NULL, (size_t)st.st_size, PROT_READ, 183 MAP_FILE | MAP_SHARED, fd, (off_t) 0); 184 185 ATF_REQUIRE(addr != MAP_FAILED); 186 187 (void)close(fd); 188 189 npgs = st.st_size / page; 190 191 if (st.st_size % page != 0) 192 npgs++; 193 194 (void)check_residency(addr, npgs); 195 196 rv = mlock(addr, npgs * page); 197 if (rv == -1 && errno == EAGAIN) 198 atf_tc_skip("hit process resource limits"); 199 ATF_REQUIRE(munmap(addr, st.st_size) == 0); 200 201 npgs = 128; 202 203 #ifdef __FreeBSD__ 204 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 205 MAP_ANON | MAP_PRIVATE, -1, (off_t)0); 206 #else 207 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 208 MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0); 209 #endif 210 211 if (addr == MAP_FAILED) 212 atf_tc_skip("could not mmap wired anonymous test area, system " 213 "might be low on memory"); 214 215 #ifdef __FreeBSD__ 216 if (mlock(addr, npgs * page) == -1 && errno != ENOMEM) 217 atf_tc_skip("could not wire anonymous test area, system might " 218 "be low on memory"); 219 #endif 220 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 221 ATF_REQUIRE(munmap(addr, npgs * page) == 0); 222 223 npgs = 128; 224 225 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 226 MAP_ANON | MAP_PRIVATE, -1, (off_t)0); 227 228 ATF_REQUIRE(addr != MAP_FAILED); 229 230 /* 231 * Check that the in-core pages match the locked pages. 232 */ 233 ATF_REQUIRE(check_residency(addr, npgs) == 0); 234 235 errno = 0; 236 if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM) 237 atf_tc_fail("mlockall(2) failed"); 238 if (errno == ENOMEM) 239 atf_tc_skip("mlockall() exceeded process resource limits"); 240 241 resident = check_residency(addr, npgs); 242 if (resident < npgs) 243 atf_tc_fail("mlockall(MCL_FUTURE) succeeded, still only " 244 "%zu pages of the newly mapped %zu pages are resident", 245 resident, npgs); 246 247 addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0); 248 addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0); 249 250 if (addr2 == MAP_FAILED || addr3 == MAP_FAILED) 251 atf_tc_skip("could not mmap more anonymous test pages with " 252 "mlockall(MCL_FUTURE) in effect, system " 253 "might be low on memory"); 254 255 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 256 ATF_REQUIRE(check_residency(addr3, npgs) == 0); 257 ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0); 258 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 259 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 260 261 (void)munlockall(); 262 263 ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0); 264 #ifdef __NetBSD__ 265 ATF_REQUIRE(check_residency(addr2, npgs) == 0); 266 #endif 267 268 (void)memset(addr, 0, npgs * page); 269 270 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0); 271 #ifdef __NetBSD__ 272 ATF_REQUIRE(check_residency(addr, npgs) == 0); 273 #endif 274 275 (void)munmap(addr, npgs * page); 276 (void)munmap(addr2, npgs * page); 277 (void)munmap(addr3, npgs * page); 278 (void)unlink(path); 279 #ifdef __FreeBSD__ 280 free(buf); 281 #endif 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