1 /* $NetBSD: t_mincore.c,v 1.15 2020/02/24 12:20:30 rin 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 1.15 2020/02/24 12:20:30 rin 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 <signal.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <unistd.h> 77 #include <sys/resource.h> 78 79 static long page = 0; 80 static const char path[] = "mincore"; 81 static size_t check_residency(void *, size_t); 82 83 #define ATF_REQUIRE_STRERROR(a) ATF_REQUIRE_MSG(a, " (%s)", strerror(errno)) 84 85 #ifndef PROT_MPROTECT 86 # define PROT_MPROTECT(flags) (0) 87 #endif 88 89 static size_t 90 check_residency(void *addr, size_t npgs) 91 { 92 size_t i, resident; 93 char *vec; 94 95 vec = malloc(npgs); 96 97 ATF_REQUIRE(vec != NULL); 98 ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0); 99 100 for (i = resident = 0; i < npgs; i++) { 101 102 if (vec[i] != 0) 103 resident++; 104 105 #if 0 106 (void)fprintf(stderr, "page %p is %sresident\n", 107 (char *)addr + (i * page), vec[i] ? "" : "not "); 108 #endif 109 } 110 111 free(vec); 112 113 return resident; 114 } 115 116 ATF_TC(mincore_err); 117 ATF_TC_HEAD(mincore_err, tc) 118 { 119 atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)"); 120 } 121 122 ATF_TC_BODY(mincore_err, tc) 123 { 124 char *map, *vec; 125 126 map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); 127 vec = malloc(page); 128 129 ATF_REQUIRE(vec != NULL); 130 ATF_REQUIRE(map != MAP_FAILED); 131 132 errno = 0; 133 ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1); 134 135 errno = 0; 136 ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1); 137 138 errno = 0; 139 ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1); 140 141 free(vec); 142 ATF_REQUIRE(munmap(map, page) == 0); 143 } 144 145 ATF_TC_WITH_CLEANUP(mincore_resid); 146 ATF_TC_HEAD(mincore_resid, tc) 147 { 148 atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)"); 149 atf_tc_set_md_var(tc, "require.user", "root"); 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 /* 162 * Bump the mlock limit to unlimited so the rest of the testcase 163 * passes instead of failing on the mlock call. 164 */ 165 rlim.rlim_max = RLIM_INFINITY; 166 rlim.rlim_cur = rlim.rlim_max; 167 ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0); 168 169 (void)memset(&st, 0, sizeof(struct stat)); 170 171 fd = open(path, O_RDWR | O_CREAT, 0700); 172 buf = malloc(page * 5); 173 174 ATF_REQUIRE(fd >= 0); 175 ATF_REQUIRE(buf != NULL); 176 177 rv = write(fd, buf, page * 5); 178 ATF_REQUIRE(rv >= 0); 179 180 ATF_REQUIRE(fd >= 0); 181 ATF_REQUIRE(fstat(fd, &st) == 0); 182 183 addr = mmap(NULL, (size_t)st.st_size, PROT_READ, 184 MAP_FILE | MAP_SHARED, fd, (off_t) 0); 185 186 ATF_REQUIRE(addr != MAP_FAILED); 187 188 (void)close(fd); 189 190 npgs = st.st_size / page; 191 192 if (st.st_size % page != 0) 193 npgs++; 194 195 (void)check_residency(addr, npgs); 196 197 rv = mlock(addr, npgs * page); 198 if (rv == -1 && errno == EAGAIN) 199 atf_tc_skip("hit process resource limits"); 200 ATF_REQUIRE(munmap(addr, st.st_size) == 0); 201 202 npgs = 128; 203 204 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 205 MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0); 206 207 if (addr == MAP_FAILED) 208 atf_tc_skip("could not mmap wired anonymous test area, system " 209 "might be low on memory"); 210 211 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 212 ATF_REQUIRE(munmap(addr, npgs * page) == 0); 213 214 npgs = 128; 215 216 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 217 MAP_ANON | MAP_PRIVATE, -1, (off_t)0); 218 219 ATF_REQUIRE(addr != MAP_FAILED); 220 221 /* 222 * Check that the in-core pages match the locked pages. 223 */ 224 ATF_REQUIRE(check_residency(addr, npgs) == 0); 225 226 errno = 0; 227 if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM) 228 atf_tc_fail("mlockall(2) failed"); 229 if (errno == ENOMEM) 230 atf_tc_skip("mlockall() exceeded process resource limits"); 231 232 resident = check_residency(addr, npgs); 233 if (resident < npgs) 234 atf_tc_fail("mlockall(MCL_FUTURE) succeeded, still only " 235 "%zu pages of the newly mapped %zu pages are resident", 236 resident, npgs); 237 238 addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0); 239 addr3 = mmap(NULL, npgs * page, PROT_MPROTECT(PROT_READ) | PROT_NONE, 240 MAP_ANON, -1, (off_t)0); 241 242 if (addr2 == MAP_FAILED || addr3 == MAP_FAILED) 243 atf_tc_skip("could not mmap more anonymous test pages with " 244 "mlockall(MCL_FUTURE) in effect, system " 245 "might be low on memory"); 246 247 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 248 ATF_REQUIRE(check_residency(addr3, npgs) == 0); 249 ATF_REQUIRE_STRERROR(mprotect(addr3, npgs * page, PROT_READ) == 0); 250 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 251 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 252 253 (void)munlockall(); 254 255 ATF_REQUIRE_STRERROR(madvise(addr2, npgs * page, MADV_FREE) == 0); 256 ATF_REQUIRE(check_residency(addr2, npgs) == 0); 257 258 (void)memset(addr, 0, npgs * page); 259 260 ATF_REQUIRE_STRERROR(madvise(addr, npgs * page, MADV_FREE) == 0); 261 ATF_REQUIRE(check_residency(addr, npgs) == 0); 262 263 (void)munmap(addr, npgs * page); 264 (void)munmap(addr2, npgs * page); 265 (void)munmap(addr3, npgs * page); 266 (void)unlink(path); 267 free(buf); 268 } 269 270 ATF_TC_CLEANUP(mincore_resid, tc) 271 { 272 (void)unlink(path); 273 } 274 275 static volatile int sig_caught; 276 277 static void 278 sigsys_handler(int signum) 279 { 280 281 sig_caught = signum; 282 } 283 284 static int 285 no_kernel_sysvmsg(void) 286 { 287 int id; 288 void (*osig)(int); 289 290 sig_caught = 0; 291 osig = signal(SIGSYS, sigsys_handler); 292 id = shmget(IPC_PRIVATE, page, IPC_CREAT | S_IRUSR | S_IWUSR); 293 if (sig_caught || id == -1) 294 return 1; 295 296 (void)shmctl(id, IPC_RMID, 0); 297 (void)signal(SIGSYS, osig); 298 299 return 0; 300 } 301 302 ATF_TC(mincore_shmseg); 303 ATF_TC_HEAD(mincore_shmseg, tc) 304 { 305 atf_tc_set_md_var(tc, "descr", "residency of shared memory"); 306 } 307 308 ATF_TC_BODY(mincore_shmseg, tc) 309 { 310 size_t npgs = 128; 311 void *addr = NULL; 312 int shmid; 313 314 if (no_kernel_sysvmsg()) 315 atf_tc_skip("No SYSVSHM in kernel"); 316 317 shmid = shmget(IPC_PRIVATE, npgs * page, 318 IPC_CREAT | S_IRUSR | S_IWUSR); 319 320 ATF_REQUIRE_STRERROR(shmid != -1); 321 322 addr = shmat(shmid, NULL, 0); 323 324 ATF_REQUIRE_STRERROR(addr != NULL); 325 ATF_REQUIRE(check_residency(addr, npgs) == 0); 326 327 (void)memset(addr, 0xff, npgs * page); 328 329 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 330 ATF_REQUIRE_STRERROR(madvise(addr, npgs * page, MADV_FREE) == 0); 331 332 /* 333 * NOTE! Even though we have MADV_FREE'd the range, 334 * there is another reference (the kernel's) to the 335 * object which owns the pages. In this case, the 336 * kernel does not simply free the pages, as haphazardly 337 * freeing pages when there are still references to 338 * an object can cause data corruption (say, the other 339 * referencer doesn't expect the pages to be freed, 340 * and is surprised by the subsequent ZFOD). 341 * 342 * Because of this, we simply report the number of 343 * pages still resident, for information only. 344 */ 345 npgs = check_residency(addr, npgs); 346 347 (void)fprintf(stderr, "%zu pages still resident\n", npgs); 348 349 ATF_REQUIRE_STRERROR(shmdt(addr) == 0); 350 ATF_REQUIRE_STRERROR(shmctl(shmid, IPC_RMID, NULL) == 0); 351 } 352 353 ATF_TP_ADD_TCS(tp) 354 { 355 356 page = sysconf(_SC_PAGESIZE); 357 ATF_REQUIRE(page >= 0); 358 359 ATF_TP_ADD_TC(tp, mincore_err); 360 ATF_TP_ADD_TC(tp, mincore_resid); 361 ATF_TP_ADD_TC(tp, mincore_shmseg); 362 363 return atf_no_error(); 364 } 365
Indexes created Sat Sep 20 22:09:52 GMT 2025