1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018 Mark Johnston <markj@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 #include <sys/mman.h> 30 31 #include <errno.h> 32 #include <stdint.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include <atf-c.h> 37 38 ATF_TC(brk_basic); 39 ATF_TC_HEAD(brk_basic, tc) 40 { 41 atf_tc_set_md_var(tc, "descr", "Verify basic brk() functionality"); 42 } 43 ATF_TC_BODY(brk_basic, tc) 44 { 45 void *oldbrk, *newbrk; 46 int error; 47 48 /* Reset the break. */ 49 error = brk(0); 50 ATF_REQUIRE_MSG(error == 0, "brk: %s", strerror(errno)); 51 52 oldbrk = sbrk(0); 53 ATF_REQUIRE(oldbrk != (void *)-1); 54 55 /* Try to allocate a page. */ 56 error = brk((void *)((intptr_t)oldbrk + PAGE_SIZE * 2)); 57 ATF_REQUIRE_MSG(error == 0, "brk: %s", strerror(errno)); 58 59 /* 60 * Attempt to set the break below minbrk. This should have no effect. 61 */ 62 error = brk((void *)((intptr_t)oldbrk - 1)); 63 ATF_REQUIRE_MSG(error == 0, "brk: %s", strerror(errno)); 64 newbrk = sbrk(0); 65 ATF_REQUIRE_MSG(newbrk != (void *)-1, "sbrk: %s", strerror(errno)); 66 ATF_REQUIRE(newbrk == oldbrk); 67 } 68 69 ATF_TC(sbrk_basic); 70 ATF_TC_HEAD(sbrk_basic, tc) 71 { 72 atf_tc_set_md_var(tc, "descr", "Verify basic sbrk() functionality"); 73 } 74 ATF_TC_BODY(sbrk_basic, tc) 75 { 76 void *newbrk, *oldbrk; 77 int *p; 78 79 oldbrk = sbrk(0); 80 ATF_REQUIRE_MSG(oldbrk != (void *)-1, "sbrk: %s", strerror(errno)); 81 p = sbrk(sizeof(*p)); 82 *p = 0; 83 ATF_REQUIRE(oldbrk == p); 84 85 newbrk = sbrk(-sizeof(*p)); 86 ATF_REQUIRE_MSG(newbrk != (void *)-1, "sbrk: %s", strerror(errno)); 87 ATF_REQUIRE(oldbrk == sbrk(0)); 88 89 oldbrk = sbrk(PAGE_SIZE * 2 + 1); 90 ATF_REQUIRE_MSG(oldbrk != (void *)-1, "sbrk: %s", strerror(errno)); 91 memset(oldbrk, 0, PAGE_SIZE * 2 + 1); 92 newbrk = sbrk(-(PAGE_SIZE * 2 + 1)); 93 ATF_REQUIRE_MSG(newbrk != (void *)-1, "sbrk: %s", strerror(errno)); 94 ATF_REQUIRE(sbrk(0) == oldbrk); 95 } 96 97 ATF_TC(mlockfuture); 98 ATF_TC_HEAD(mlockfuture, tc) 99 { 100 atf_tc_set_md_var(tc, "descr", 101 "Verify that mlockall(MCL_FUTURE) applies to the data segment"); 102 } 103 ATF_TC_BODY(mlockfuture, tc) 104 { 105 void *oldbrk, *n, *newbrk; 106 int error; 107 char v; 108 109 error = mlockall(MCL_FUTURE); 110 ATF_REQUIRE_MSG(error == 0, 111 "mlockall: %s", strerror(errno)); 112 113 /* 114 * Advance the break so that at least one page is added to the data 115 * segment. This page should be automatically faulted in to the address 116 * space. 117 */ 118 oldbrk = sbrk(0); 119 ATF_REQUIRE(oldbrk != (void *)-1); 120 newbrk = sbrk(PAGE_SIZE * 2); 121 ATF_REQUIRE(newbrk != (void *)-1); 122 123 n = (void *)(((uintptr_t)oldbrk + PAGE_SIZE) & ~PAGE_SIZE); 124 v = 0; 125 error = mincore(n, PAGE_SIZE, &v); 126 ATF_REQUIRE_MSG(error == 0, 127 "mincore: %s", strerror(errno)); 128 ATF_REQUIRE_MSG((v & MINCORE_INCORE) != 0, 129 "unexpected page flags %#x", v); 130 131 error = brk(oldbrk); 132 ATF_REQUIRE(error == 0); 133 134 error = munlockall(); 135 ATF_REQUIRE_MSG(error == 0, 136 "munlockall: %s", strerror(errno)); 137 } 138 139 ATF_TP_ADD_TCS(tp) 140 { 141 ATF_TP_ADD_TC(tp, brk_basic); 142 ATF_TP_ADD_TC(tp, sbrk_basic); 143 ATF_TP_ADD_TC(tp, mlockfuture); 144 145 return (atf_no_error()); 146 } 147