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 #include <sys/mman.h> 35 #include <sys/resource.h> 36 #include <sys/sysctl.h> 37 #include <sys/wait.h> 38 39 #include <errno.h> 40 #include <atf-c.h> 41 #include <stdint.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 static long page = 0; 47 48 ATF_TC(mlock_clip); 49 ATF_TC_HEAD(mlock_clip, tc) 50 { 51 atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only " 52 "clips if the clip address is within the entry (PR kern/44788)"); 53 } 54 55 ATF_TC_BODY(mlock_clip, tc) 56 { 57 void *buf; 58 59 buf = malloc(page); 60 ATF_REQUIRE(buf != NULL); 61 62 if (page < 1024) 63 atf_tc_skip("page size too small"); 64 65 for (size_t i = page; i >= 1; i = i - 1024) { 66 (void)mlock(buf, page - i); 67 (void)munlock(buf, page - i); 68 } 69 70 free(buf); 71 } 72 73 ATF_TC(mlock_err); 74 ATF_TC_HEAD(mlock_err, tc) 75 { 76 atf_tc_set_md_var(tc, "descr", 77 "Test error conditions in mlock(2) and munlock(2)"); 78 } 79 80 ATF_TC_BODY(mlock_err, tc) 81 { 82 void *invalid_ptr; 83 void *buf; 84 85 /* 86 * Any bad address must return ENOMEM (for lock & unlock) 87 */ 88 errno = 0; 89 ATF_REQUIRE_ERRNO(ENOMEM, mlock(NULL, page) == -1); 90 91 errno = 0; 92 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1); 93 94 errno = 0; 95 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)-1, page) == -1); 96 97 errno = 0; 98 ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1); 99 100 errno = 0; 101 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1); 102 103 errno = 0; 104 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)-1, page) == -1); 105 106 buf = malloc(page); 107 ATF_REQUIRE(buf != NULL); 108 109 /* 110 * unlocking memory that is not locked is an error... 111 */ 112 113 errno = 0; 114 ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, page) == -1); 115 116 /* 117 * These are permitted to fail (EINVAL) but do not on NetBSD 118 */ 119 ATF_REQUIRE(mlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0); 120 ATF_REQUIRE(munlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0); 121 122 (void)free(buf); 123 124 /* 125 * Try to create a pointer to an unmapped page - first after current 126 * brk will likely do. 127 */ 128 invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1)); 129 printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr); 130 131 errno = 0; 132 ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1); 133 134 errno = 0; 135 ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1); 136 } 137 138 ATF_TC(mlock_limits); 139 ATF_TC_HEAD(mlock_limits, tc) 140 { 141 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)"); 142 } 143 144 ATF_TC_BODY(mlock_limits, tc) 145 { 146 struct rlimit res; 147 void *buf; 148 pid_t pid; 149 int sta; 150 151 buf = malloc(page); 152 ATF_REQUIRE(buf != NULL); 153 154 pid = fork(); 155 ATF_REQUIRE(pid >= 0); 156 157 if (pid == 0) { 158 159 for (ssize_t i = page; i >= 2; i -= 100) { 160 161 res.rlim_cur = i - 1; 162 res.rlim_max = i - 1; 163 164 (void)fprintf(stderr, "trying to lock %zd bytes " 165 "with %zu byte limit\n", i, (size_t)res.rlim_cur); 166 167 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0) 168 _exit(EXIT_FAILURE); 169 170 errno = 0; 171 172 if (mlock(buf, i) != -1 || errno != EAGAIN) { 173 (void)munlock(buf, i); 174 _exit(EXIT_FAILURE); 175 } 176 } 177 178 _exit(EXIT_SUCCESS); 179 } 180 181 (void)wait(&sta); 182 183 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 184 atf_tc_fail("mlock(2) locked beyond system limits"); 185 186 free(buf); 187 } 188 189 ATF_TC(mlock_mmap); 190 ATF_TC_HEAD(mlock_mmap, tc) 191 { 192 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction"); 193 } 194 195 ATF_TC_BODY(mlock_mmap, tc) 196 { 197 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED; 198 void *buf; 199 200 /* 201 * Make a wired RW mapping and check that mlock(2) 202 * does not fail for the (already locked) mapping. 203 */ 204 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0); 205 206 ATF_REQUIRE(buf != MAP_FAILED); 207 ATF_REQUIRE(mlock(buf, page) == 0); 208 ATF_REQUIRE(munlock(buf, page) == 0); 209 ATF_REQUIRE(munmap(buf, page) == 0); 210 ATF_REQUIRE(munlock(buf, page) != 0); 211 212 /* 213 * But it should be impossible to mlock(2) a PROT_NONE mapping. 214 */ 215 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0); 216 217 ATF_REQUIRE(buf != MAP_FAILED); 218 ATF_REQUIRE(mlock(buf, page) != 0); 219 ATF_REQUIRE(munmap(buf, page) == 0); 220 } 221 222 ATF_TC(mlock_nested); 223 ATF_TC_HEAD(mlock_nested, tc) 224 { 225 atf_tc_set_md_var(tc, "descr", 226 "Test that consecutive mlock(2) calls succeed"); 227 } 228 229 ATF_TC_BODY(mlock_nested, tc) 230 { 231 const size_t maxiter = 100; 232 void *buf; 233 234 buf = malloc(page); 235 ATF_REQUIRE(buf != NULL); 236 237 for (size_t i = 0; i < maxiter; i++) 238 ATF_REQUIRE(mlock(buf, page) == 0); 239 240 ATF_REQUIRE(munlock(buf, page) == 0); 241 free(buf); 242 } 243 244 ATF_TP_ADD_TCS(tp) 245 { 246 247 page = sysconf(_SC_PAGESIZE); 248 ATF_REQUIRE(page >= 0); 249 250 ATF_TP_ADD_TC(tp, mlock_clip); 251 ATF_TP_ADD_TC(tp, mlock_err); 252 ATF_TP_ADD_TC(tp, mlock_limits); 253 ATF_TP_ADD_TC(tp, mlock_mmap); 254 ATF_TP_ADD_TC(tp, mlock_nested); 255 256 return atf_no_error(); 257 } 258