1 /* $NetBSD: t_mlock.c,v 1.2 2012/04/21 01:15:13 jruoho 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 1.2 2012/04/21 01:15:13 jruoho Exp $"); 33 34 #include <sys/mman.h> 35 #include <sys/resource.h> 36 #include <sys/wait.h> 37 38 #include <errno.h> 39 #include <atf-c.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 static long page = 0; 45 46 ATF_TC(mlock_clip); 47 ATF_TC_HEAD(mlock_clip, tc) 48 { 49 atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only " 50 "clips if the clip address is within the entry (PR kern/44788)"); 51 } 52 53 ATF_TC_BODY(mlock_clip, tc) 54 { 55 void *buf; 56 57 buf = malloc(page); 58 ATF_REQUIRE(buf != NULL); 59 60 if (page < 1024) 61 atf_tc_skip("page size too small"); 62 63 for (size_t i = page; i >= 1; i = i - 1024) { 64 (void)mlock(buf, page - i); 65 (void)munlock(buf, page - i); 66 } 67 68 free(buf); 69 } 70 71 ATF_TC(mlock_err); 72 ATF_TC_HEAD(mlock_err, tc) 73 { 74 atf_tc_set_md_var(tc, "descr", 75 "Test error conditions in mlock(2) and munlock(2)"); 76 } 77 78 ATF_TC_BODY(mlock_err, tc) 79 { 80 81 errno = 0; 82 ATF_REQUIRE_ERRNO(ENOMEM, mlock(NULL, page) == -1); 83 84 errno = 0; 85 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1); 86 87 errno = 0; 88 ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1); 89 90 errno = 0; 91 ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1); 92 93 errno = 0; 94 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1); 95 96 errno = 0; 97 ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1); 98 } 99 100 ATF_TC(mlock_limits); 101 ATF_TC_HEAD(mlock_limits, tc) 102 { 103 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)"); 104 } 105 106 ATF_TC_BODY(mlock_limits, tc) 107 { 108 struct rlimit res; 109 void *buf; 110 pid_t pid; 111 int sta; 112 113 buf = malloc(page); 114 ATF_REQUIRE(buf != NULL); 115 116 pid = fork(); 117 ATF_REQUIRE(pid >= 0); 118 119 if (pid == 0) { 120 121 for (ssize_t i = page; i >= 2; i -= 100) { 122 123 res.rlim_cur = i - 1; 124 res.rlim_max = i - 1; 125 126 (void)fprintf(stderr, "trying to lock %zd bytes " 127 "with %zu byte limit\n", i, (size_t)res.rlim_cur); 128 129 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0) 130 _exit(EXIT_FAILURE); 131 132 errno = 0; 133 134 if (mlock(buf, i) != -1 || errno != EAGAIN) { 135 (void)munlock(buf, i); 136 _exit(EXIT_FAILURE); 137 } 138 } 139 140 _exit(EXIT_SUCCESS); 141 } 142 143 (void)wait(&sta); 144 145 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 146 atf_tc_fail("mlock(2) locked beyond system limits"); 147 148 free(buf); 149 } 150 151 ATF_TC(mlock_mmap); 152 ATF_TC_HEAD(mlock_mmap, tc) 153 { 154 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction"); 155 } 156 157 ATF_TC_BODY(mlock_mmap, tc) 158 { 159 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED; 160 void *buf; 161 162 /* 163 * Make a wired RW mapping and check that mlock(2) 164 * does not fail for the (already locked) mapping. 165 */ 166 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0); 167 168 ATF_REQUIRE(buf != MAP_FAILED); 169 ATF_REQUIRE(mlock(buf, page) == 0); 170 ATF_REQUIRE(munlock(buf, page) == 0); 171 ATF_REQUIRE(munmap(buf, page) == 0); 172 ATF_REQUIRE(munlock(buf, page) != 0); 173 174 /* 175 * But it should be impossible to mlock(2) a PROT_NONE mapping. 176 */ 177 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0); 178 179 ATF_REQUIRE(buf != MAP_FAILED); 180 ATF_REQUIRE(mlock(buf, page) != 0); 181 ATF_REQUIRE(munmap(buf, page) == 0); 182 } 183 184 ATF_TC(mlock_nested); 185 ATF_TC_HEAD(mlock_nested, tc) 186 { 187 atf_tc_set_md_var(tc, "descr", 188 "Test that consecutive mlock(2) calls succeed"); 189 } 190 191 ATF_TC_BODY(mlock_nested, tc) 192 { 193 const size_t maxiter = 100; 194 void *buf; 195 196 buf = malloc(page); 197 ATF_REQUIRE(buf != NULL); 198 199 for (size_t i = 0; i < maxiter; i++) 200 ATF_REQUIRE(mlock(buf, page) == 0); 201 202 ATF_REQUIRE(munlock(buf, page) == 0); 203 free(buf); 204 } 205 206 ATF_TP_ADD_TCS(tp) 207 { 208 209 page = sysconf(_SC_PAGESIZE); 210 ATF_REQUIRE(page >= 0); 211 212 ATF_TP_ADD_TC(tp, mlock_clip); 213 ATF_TP_ADD_TC(tp, mlock_err); 214 ATF_TP_ADD_TC(tp, mlock_limits); 215 ATF_TP_ADD_TC(tp, mlock_mmap); 216 ATF_TP_ADD_TC(tp, mlock_nested); 217 218 return atf_no_error(); 219 } 220