1 /* $NetBSD: t_mlock.c,v 1.4 2012/09/08 12:25:05 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 1.4 2012/09/08 12:25:05 martin Exp $"); 33 34 #include <sys/mman.h> 35 #include <sys/resource.h> 36 #include <sys/wait.h> 37 #define _KMEMUSER 38 #include <machine/vmparam.h> 39 40 #include <errno.h> 41 #include <atf-c.h> 42 #include <stdint.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 static long page = 0; 48 49 ATF_TC(mlock_clip); 50 ATF_TC_HEAD(mlock_clip, tc) 51 { 52 atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only " 53 "clips if the clip address is within the entry (PR kern/44788)"); 54 } 55 56 ATF_TC_BODY(mlock_clip, tc) 57 { 58 void *buf; 59 60 buf = malloc(page); 61 ATF_REQUIRE(buf != NULL); 62 63 if (page < 1024) 64 atf_tc_skip("page size too small"); 65 66 for (size_t i = page; i >= 1; i = i - 1024) { 67 (void)mlock(buf, page - i); 68 (void)munlock(buf, page - i); 69 } 70 71 free(buf); 72 } 73 74 ATF_TC(mlock_err); 75 ATF_TC_HEAD(mlock_err, tc) 76 { 77 atf_tc_set_md_var(tc, "descr", 78 "Test error conditions in mlock(2) and munlock(2)"); 79 } 80 81 ATF_TC_BODY(mlock_err, tc) 82 { 83 void *invalid_ptr; 84 int null_errno = ENOMEM; /* error expected for NULL */ 85 86 #ifdef VM_MIN_ADDRESS 87 if ((uintptr_t)VM_MIN_ADDRESS > 0) 88 null_errno = EINVAL; /* NULL is not inside user VM */ 89 #endif 90 91 errno = 0; 92 ATF_REQUIRE_ERRNO(null_errno, mlock(NULL, page) == -1); 93 94 errno = 0; 95 ATF_REQUIRE_ERRNO(null_errno, mlock((char *)0, page) == -1); 96 97 errno = 0; 98 ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1); 99 100 errno = 0; 101 ATF_REQUIRE_ERRNO(null_errno, munlock(NULL, page) == -1); 102 103 errno = 0; 104 ATF_REQUIRE_ERRNO(null_errno, munlock((char *)0, page) == -1); 105 106 errno = 0; 107 ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1); 108 109 /* 110 * Try to create a pointer to an unmapped page - first after current 111 * brk will likely do. 112 */ 113 invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1)); 114 printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr); 115 116 errno = 0; 117 ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1); 118 119 errno = 0; 120 ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1); 121 } 122 123 ATF_TC(mlock_limits); 124 ATF_TC_HEAD(mlock_limits, tc) 125 { 126 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)"); 127 } 128 129 ATF_TC_BODY(mlock_limits, tc) 130 { 131 struct rlimit res; 132 void *buf; 133 pid_t pid; 134 int sta; 135 136 buf = malloc(page); 137 ATF_REQUIRE(buf != NULL); 138 139 pid = fork(); 140 ATF_REQUIRE(pid >= 0); 141 142 if (pid == 0) { 143 144 for (ssize_t i = page; i >= 2; i -= 100) { 145 146 res.rlim_cur = i - 1; 147 res.rlim_max = i - 1; 148 149 (void)fprintf(stderr, "trying to lock %zd bytes " 150 "with %zu byte limit\n", i, (size_t)res.rlim_cur); 151 152 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0) 153 _exit(EXIT_FAILURE); 154 155 errno = 0; 156 157 if (mlock(buf, i) != -1 || errno != EAGAIN) { 158 (void)munlock(buf, i); 159 _exit(EXIT_FAILURE); 160 } 161 } 162 163 _exit(EXIT_SUCCESS); 164 } 165 166 (void)wait(&sta); 167 168 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 169 atf_tc_fail("mlock(2) locked beyond system limits"); 170 171 free(buf); 172 } 173 174 ATF_TC(mlock_mmap); 175 ATF_TC_HEAD(mlock_mmap, tc) 176 { 177 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction"); 178 } 179 180 ATF_TC_BODY(mlock_mmap, tc) 181 { 182 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED; 183 void *buf; 184 185 /* 186 * Make a wired RW mapping and check that mlock(2) 187 * does not fail for the (already locked) mapping. 188 */ 189 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0); 190 191 ATF_REQUIRE(buf != MAP_FAILED); 192 ATF_REQUIRE(mlock(buf, page) == 0); 193 ATF_REQUIRE(munlock(buf, page) == 0); 194 ATF_REQUIRE(munmap(buf, page) == 0); 195 ATF_REQUIRE(munlock(buf, page) != 0); 196 197 /* 198 * But it should be impossible to mlock(2) a PROT_NONE mapping. 199 */ 200 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0); 201 202 ATF_REQUIRE(buf != MAP_FAILED); 203 ATF_REQUIRE(mlock(buf, page) != 0); 204 ATF_REQUIRE(munmap(buf, page) == 0); 205 } 206 207 ATF_TC(mlock_nested); 208 ATF_TC_HEAD(mlock_nested, tc) 209 { 210 atf_tc_set_md_var(tc, "descr", 211 "Test that consecutive mlock(2) calls succeed"); 212 } 213 214 ATF_TC_BODY(mlock_nested, tc) 215 { 216 const size_t maxiter = 100; 217 void *buf; 218 219 buf = malloc(page); 220 ATF_REQUIRE(buf != NULL); 221 222 for (size_t i = 0; i < maxiter; i++) 223 ATF_REQUIRE(mlock(buf, page) == 0); 224 225 ATF_REQUIRE(munlock(buf, page) == 0); 226 free(buf); 227 } 228 229 ATF_TP_ADD_TCS(tp) 230 { 231 232 page = sysconf(_SC_PAGESIZE); 233 ATF_REQUIRE(page >= 0); 234 235 ATF_TP_ADD_TC(tp, mlock_clip); 236 ATF_TP_ADD_TC(tp, mlock_err); 237 ATF_TP_ADD_TC(tp, mlock_limits); 238 ATF_TP_ADD_TC(tp, mlock_mmap); 239 ATF_TP_ADD_TC(tp, mlock_nested); 240 241 return atf_no_error(); 242 } 243