1 /* $NetBSD: t_mlock.c,v 1.6 2016/08/09 12:02:44 kre Exp $ */ 2 3 /*- 4 * Copyright (c) 2012 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 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: t_mlock.c,v 1.6 2016/08/09 12:02:44 kre Exp $"); 33 34 #ifdef __FreeBSD__ 35 #include <sys/param.h> /* NetBSD requires sys/param.h for sysctl(3), unlike FreeBSD */ 36 #endif 37 #include <sys/mman.h> 38 #include <sys/resource.h> 39 #include <sys/sysctl.h> 40 #include <sys/wait.h> 41 42 #include <errno.h> 43 #include <atf-c.h> 44 #include <stdint.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 49 #ifdef __FreeBSD__ 50 #include <limits.h> 51 #define _KMEMUSER 52 #include <machine/vmparam.h> 53 54 void set_vm_max_wired(u_long); 55 void restore_vm_max_wired(void); 56 #endif 57 58 static long page = 0; 59 60 ATF_TC(mlock_clip); 61 ATF_TC_HEAD(mlock_clip, tc) 62 { 63 atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only " 64 "clips if the clip address is within the entry (PR kern/44788)"); 65 } 66 67 ATF_TC_BODY(mlock_clip, tc) 68 { 69 void *buf; 70 71 buf = malloc(page); 72 ATF_REQUIRE(buf != NULL); 73 74 if (page < 1024) 75 atf_tc_skip("page size too small"); 76 77 for (size_t i = page; i >= 1; i = i - 1024) { 78 (void)mlock(buf, page - i); 79 (void)munlock(buf, page - i); 80 } 81 82 free(buf); 83 } 84 85 #ifdef __FreeBSD__ 86 ATF_TC_WITH_CLEANUP(mlock_err); 87 #else 88 ATF_TC(mlock_err); 89 #endif 90 ATF_TC_HEAD(mlock_err, tc) 91 { 92 atf_tc_set_md_var(tc, "descr", 93 "Test error conditions in mlock(2) and munlock(2)"); 94 #ifdef __FreeBSD__ 95 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects"); 96 atf_tc_set_md_var(tc, "require.user", "root"); 97 #endif 98 } 99 100 ATF_TC_BODY(mlock_err, tc) 101 { 102 #ifdef __NetBSD__ 103 unsigned long vmin = 0; 104 size_t len = sizeof(vmin); 105 #endif 106 #if !defined(__aarch64__) && !defined(__riscv) 107 void *invalid_ptr; 108 #endif 109 int null_errno = ENOMEM; /* error expected for NULL */ 110 void *buf; 111 112 #ifdef __FreeBSD__ 113 #ifdef VM_MIN_ADDRESS 114 if ((uintptr_t)VM_MIN_ADDRESS > 0) 115 null_errno = EINVAL; /* NULL is not inside user VM */ 116 #endif 117 /* Set max_wired really really high to avoid EAGAIN */ 118 set_vm_max_wired(INT_MAX); 119 #else 120 if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0) 121 atf_tc_fail("failed to read vm.minaddress"); 122 /* 123 * Any bad address must return ENOMEM (for lock & unlock) 124 */ 125 errno = 0; 126 ATF_REQUIRE_ERRNO(ENOMEM, mlock(NULL, page) == -1); 127 128 if (vmin > 0) 129 null_errno = EINVAL; /* NULL is not inside user VM */ 130 #endif 131 132 errno = 0; 133 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1); 134 135 errno = 0; 136 ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1); 137 138 errno = 0; 139 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1); 140 141 #ifdef __FreeBSD__ 142 /* Wrap around should return EINVAL */ 143 errno = 0; 144 ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1); 145 errno = 0; 146 ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1); 147 #else 148 errno = 0; 149 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)-1, page) == -1); 150 errno = 0; 151 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)-1, page) == -1); 152 #endif 153 154 buf = malloc(page); /* Get a valid address */ 155 ATF_REQUIRE(buf != NULL); 156 #ifdef __FreeBSD__ 157 errno = 0; 158 /* Wrap around should return EINVAL */ 159 ATF_REQUIRE_ERRNO(EINVAL, mlock(buf, -page) == -1); 160 errno = 0; 161 ATF_REQUIRE_ERRNO(EINVAL, munlock(buf, -page) == -1); 162 #else 163 errno = 0; 164 ATF_REQUIRE_ERRNO(ENOMEM, mlock(buf, -page) == -1); 165 errno = 0; 166 ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, -page) == -1); 167 #endif 168 (void)free(buf); 169 170 /* There is no sbrk on AArch64 and RISC-V */ 171 #if !defined(__aarch64__) && !defined(__riscv) 172 /* 173 * Try to create a pointer to an unmapped page - first after current 174 * brk will likely do. 175 */ 176 invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1)); 177 printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr); 178 179 errno = 0; 180 ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1); 181 182 errno = 0; 183 ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1); 184 #endif 185 } 186 187 #ifdef __FreeBSD__ 188 ATF_TC_CLEANUP(mlock_err, tc) 189 { 190 191 restore_vm_max_wired(); 192 } 193 #endif 194 195 ATF_TC(mlock_limits); 196 ATF_TC_HEAD(mlock_limits, tc) 197 { 198 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)"); 199 } 200 201 ATF_TC_BODY(mlock_limits, tc) 202 { 203 struct rlimit res; 204 void *buf; 205 pid_t pid; 206 int sta; 207 208 buf = malloc(page); 209 ATF_REQUIRE(buf != NULL); 210 211 pid = fork(); 212 ATF_REQUIRE(pid >= 0); 213 214 if (pid == 0) { 215 216 for (ssize_t i = page; i >= 2; i -= 100) { 217 218 res.rlim_cur = i - 1; 219 res.rlim_max = i - 1; 220 221 (void)fprintf(stderr, "trying to lock %zd bytes " 222 "with %zu byte limit\n", i, (size_t)res.rlim_cur); 223 224 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0) 225 _exit(EXIT_FAILURE); 226 227 errno = 0; 228 229 #ifdef __FreeBSD__ 230 /* 231 * NetBSD doesn't conform to POSIX with ENOMEM requirement; 232 * FreeBSD does. 233 * 234 * See: NetBSD PR # kern/48962 for more details. 235 */ 236 if (mlock(buf, i) != -1 || errno != ENOMEM) { 237 #else 238 if (mlock(buf, i) != -1 || errno != EAGAIN) { 239 #endif 240 (void)munlock(buf, i); 241 _exit(EXIT_FAILURE); 242 } 243 } 244 245 _exit(EXIT_SUCCESS); 246 } 247 248 (void)wait(&sta); 249 250 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 251 atf_tc_fail("mlock(2) locked beyond system limits"); 252 253 free(buf); 254 } 255 256 #ifdef __FreeBSD__ 257 ATF_TC_WITH_CLEANUP(mlock_mmap); 258 #else 259 ATF_TC(mlock_mmap); 260 #endif 261 ATF_TC_HEAD(mlock_mmap, tc) 262 { 263 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction"); 264 #ifdef __FreeBSD__ 265 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects"); 266 atf_tc_set_md_var(tc, "require.user", "root"); 267 #endif 268 } 269 270 ATF_TC_BODY(mlock_mmap, tc) 271 { 272 #ifdef __NetBSD__ 273 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED; 274 #else 275 static const int flags = MAP_ANON | MAP_PRIVATE; 276 #endif 277 void *buf; 278 279 #ifdef __FreeBSD__ 280 /* Set max_wired really really high to avoid EAGAIN */ 281 set_vm_max_wired(INT_MAX); 282 #endif 283 284 /* 285 * Make a wired RW mapping and check that mlock(2) 286 * does not fail for the (already locked) mapping. 287 */ 288 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0); 289 290 ATF_REQUIRE(buf != MAP_FAILED); 291 #ifdef __FreeBSD__ 292 /* 293 * The duplicate mlock call is added to ensure that the call works 294 * as described above without MAP_WIRED support. 295 */ 296 ATF_REQUIRE(mlock(buf, page) == 0); 297 #endif 298 ATF_REQUIRE(mlock(buf, page) == 0); 299 ATF_REQUIRE(munlock(buf, page) == 0); 300 ATF_REQUIRE(munmap(buf, page) == 0); 301 ATF_REQUIRE(munlock(buf, page) != 0); 302 303 /* 304 * But it should be impossible to mlock(2) a PROT_NONE mapping. 305 */ 306 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0); 307 308 ATF_REQUIRE(buf != MAP_FAILED); 309 #ifdef __FreeBSD__ 310 ATF_REQUIRE_ERRNO(ENOMEM, mlock(buf, page) != 0); 311 #else 312 ATF_REQUIRE(mlock(buf, page) != 0); 313 #endif 314 ATF_REQUIRE(munmap(buf, page) == 0); 315 } 316 317 #ifdef __FreeBSD__ 318 ATF_TC_CLEANUP(mlock_mmap, tc) 319 { 320 321 restore_vm_max_wired(); 322 } 323 #endif 324 325 #ifdef __FreeBSD__ 326 ATF_TC_WITH_CLEANUP(mlock_nested); 327 #else 328 ATF_TC(mlock_nested); 329 #endif 330 ATF_TC_HEAD(mlock_nested, tc) 331 { 332 atf_tc_set_md_var(tc, "descr", 333 "Test that consecutive mlock(2) calls succeed"); 334 #ifdef __FreeBSD__ 335 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects"); 336 atf_tc_set_md_var(tc, "require.user", "root"); 337 #endif 338 } 339 340 ATF_TC_BODY(mlock_nested, tc) 341 { 342 const size_t maxiter = 100; 343 void *buf; 344 345 #ifdef __FreeBSD__ 346 /* Set max_wired really really high to avoid EAGAIN */ 347 set_vm_max_wired(INT_MAX); 348 #endif 349 350 buf = malloc(page); 351 ATF_REQUIRE(buf != NULL); 352 353 for (size_t i = 0; i < maxiter; i++) 354 ATF_REQUIRE(mlock(buf, page) == 0); 355 356 ATF_REQUIRE(munlock(buf, page) == 0); 357 free(buf); 358 } 359 360 #ifdef __FreeBSD__ 361 ATF_TC_CLEANUP(mlock_nested, tc) 362 { 363 364 restore_vm_max_wired(); 365 } 366 #endif 367 368 #ifdef __FreeBSD__ 369 ATF_TC_WITH_CLEANUP(mlock_unaligned); 370 #else 371 ATF_TC(mlock_unaligned); 372 #endif 373 ATF_TC_HEAD(mlock_unaligned, tc) 374 { 375 atf_tc_set_md_var(tc, "descr", 376 "Test that mlock(2) can lock page-unaligned memory"); 377 #ifdef __FreeBSD__ 378 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects"); 379 atf_tc_set_md_var(tc, "require.user", "root"); 380 #endif 381 } 382 383 ATF_TC_BODY(mlock_unaligned, tc) 384 { 385 void *buf, *addr; 386 387 #ifdef __FreeBSD__ 388 /* Set max_wired really really high to avoid EAGAIN */ 389 set_vm_max_wired(INT_MAX); 390 #endif 391 392 buf = malloc(page); 393 ATF_REQUIRE(buf != NULL); 394 395 if ((uintptr_t)buf & ((uintptr_t)page - 1)) 396 addr = buf; 397 else 398 addr = (void *)(((uintptr_t)buf) + page/3); 399 400 ATF_REQUIRE_EQ(mlock(addr, page/5), 0); 401 ATF_REQUIRE_EQ(munlock(addr, page/5), 0); 402 403 (void)free(buf); 404 } 405 406 #ifdef __FreeBSD__ 407 ATF_TC_CLEANUP(mlock_unaligned, tc) 408 { 409 410 restore_vm_max_wired(); 411 } 412 #endif 413 414 ATF_TC(munlock_unlocked); 415 ATF_TC_HEAD(munlock_unlocked, tc) 416 { 417 atf_tc_set_md_var(tc, "descr", 418 #ifdef __FreeBSD__ 419 "munlock(2) accepts unlocked memory"); 420 #else 421 "munlock(2) of unlocked memory is an error"); 422 #endif 423 atf_tc_set_md_var(tc, "require.user", "root"); 424 } 425 426 ATF_TC_BODY(munlock_unlocked, tc) 427 { 428 void *buf; 429 430 buf = malloc(page); 431 ATF_REQUIRE(buf != NULL); 432 433 #ifdef __FreeBSD__ 434 ATF_REQUIRE_EQ(munlock(buf, page), 0); 435 #else 436 errno = 0; 437 ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, page) == -1); 438 #endif 439 (void)free(buf); 440 } 441 442 ATF_TP_ADD_TCS(tp) 443 { 444 445 page = sysconf(_SC_PAGESIZE); 446 ATF_REQUIRE(page >= 0); 447 448 ATF_TP_ADD_TC(tp, mlock_clip); 449 ATF_TP_ADD_TC(tp, mlock_err); 450 ATF_TP_ADD_TC(tp, mlock_limits); 451 ATF_TP_ADD_TC(tp, mlock_mmap); 452 ATF_TP_ADD_TC(tp, mlock_nested); 453 ATF_TP_ADD_TC(tp, mlock_unaligned); 454 ATF_TP_ADD_TC(tp, munlock_unlocked); 455 456 return atf_no_error(); 457 } 458