1 /* $NetBSD: t_mlock.c,v 1.5 2014/02/26 20:49:26 martin 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 1.5 2014/02/26 20:49:26 martin 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 unsigned long vmin = 0; 83 size_t len = sizeof(vmin); 84 void *invalid_ptr; 85 int null_errno = ENOMEM; /* error expected for NULL */ 86 87 if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0) 88 atf_tc_fail("failed to read vm.minaddress"); 89 90 if (vmin > 0) 91 null_errno = EINVAL; /* NULL is not inside user VM */ 92 93 errno = 0; 94 ATF_REQUIRE_ERRNO(null_errno, mlock(NULL, page) == -1); 95 96 errno = 0; 97 ATF_REQUIRE_ERRNO(null_errno, mlock((char *)0, page) == -1); 98 99 errno = 0; 100 ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1); 101 102 errno = 0; 103 ATF_REQUIRE_ERRNO(null_errno, munlock(NULL, page) == -1); 104 105 errno = 0; 106 ATF_REQUIRE_ERRNO(null_errno, munlock((char *)0, page) == -1); 107 108 errno = 0; 109 ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1); 110 111 /* 112 * Try to create a pointer to an unmapped page - first after current 113 * brk will likely do. 114 */ 115 invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1)); 116 printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr); 117 118 errno = 0; 119 ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1); 120 121 errno = 0; 122 ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1); 123 } 124 125 ATF_TC(mlock_limits); 126 ATF_TC_HEAD(mlock_limits, tc) 127 { 128 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)"); 129 } 130 131 ATF_TC_BODY(mlock_limits, tc) 132 { 133 struct rlimit res; 134 void *buf; 135 pid_t pid; 136 int sta; 137 138 buf = malloc(page); 139 ATF_REQUIRE(buf != NULL); 140 141 pid = fork(); 142 ATF_REQUIRE(pid >= 0); 143 144 if (pid == 0) { 145 146 for (ssize_t i = page; i >= 2; i -= 100) { 147 148 res.rlim_cur = i - 1; 149 res.rlim_max = i - 1; 150 151 (void)fprintf(stderr, "trying to lock %zd bytes " 152 "with %zu byte limit\n", i, (size_t)res.rlim_cur); 153 154 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0) 155 _exit(EXIT_FAILURE); 156 157 errno = 0; 158 159 if (mlock(buf, i) != -1 || errno != EAGAIN) { 160 (void)munlock(buf, i); 161 _exit(EXIT_FAILURE); 162 } 163 } 164 165 _exit(EXIT_SUCCESS); 166 } 167 168 (void)wait(&sta); 169 170 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 171 atf_tc_fail("mlock(2) locked beyond system limits"); 172 173 free(buf); 174 } 175 176 ATF_TC(mlock_mmap); 177 ATF_TC_HEAD(mlock_mmap, tc) 178 { 179 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction"); 180 } 181 182 ATF_TC_BODY(mlock_mmap, tc) 183 { 184 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED; 185 void *buf; 186 187 /* 188 * Make a wired RW mapping and check that mlock(2) 189 * does not fail for the (already locked) mapping. 190 */ 191 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0); 192 193 ATF_REQUIRE(buf != MAP_FAILED); 194 ATF_REQUIRE(mlock(buf, page) == 0); 195 ATF_REQUIRE(munlock(buf, page) == 0); 196 ATF_REQUIRE(munmap(buf, page) == 0); 197 ATF_REQUIRE(munlock(buf, page) != 0); 198 199 /* 200 * But it should be impossible to mlock(2) a PROT_NONE mapping. 201 */ 202 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0); 203 204 ATF_REQUIRE(buf != MAP_FAILED); 205 ATF_REQUIRE(mlock(buf, page) != 0); 206 ATF_REQUIRE(munmap(buf, page) == 0); 207 } 208 209 ATF_TC(mlock_nested); 210 ATF_TC_HEAD(mlock_nested, tc) 211 { 212 atf_tc_set_md_var(tc, "descr", 213 "Test that consecutive mlock(2) calls succeed"); 214 } 215 216 ATF_TC_BODY(mlock_nested, tc) 217 { 218 const size_t maxiter = 100; 219 void *buf; 220 221 buf = malloc(page); 222 ATF_REQUIRE(buf != NULL); 223 224 for (size_t i = 0; i < maxiter; i++) 225 ATF_REQUIRE(mlock(buf, page) == 0); 226 227 ATF_REQUIRE(munlock(buf, page) == 0); 228 free(buf); 229 } 230 231 ATF_TP_ADD_TCS(tp) 232 { 233 234 page = sysconf(_SC_PAGESIZE); 235 ATF_REQUIRE(page >= 0); 236 237 ATF_TP_ADD_TC(tp, mlock_clip); 238 ATF_TP_ADD_TC(tp, mlock_err); 239 ATF_TP_ADD_TC(tp, mlock_limits); 240 ATF_TP_ADD_TC(tp, mlock_mmap); 241 ATF_TP_ADD_TC(tp, mlock_nested); 242 243 return atf_no_error(); 244 } 245