1 /*- 2 * Copyright (c) 2015, 2020 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 6 * under sponsorship from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/exec.h> 35 #include <sys/sysctl.h> 36 #include <sys/user.h> 37 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <limits.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 #include <atf-c.h> 45 #include <vm/vm.h> 46 #include <vm/pmap.h> 47 #include <machine/vmparam.h> 48 49 static int scratch_file; 50 51 static int 52 copyin_checker(uintptr_t uaddr, size_t len) 53 { 54 ssize_t ret; 55 56 ret = write(scratch_file, (const void *)uaddr, len); 57 return (ret == -1 ? errno : 0); 58 } 59 60 #if __SIZEOF_POINTER__ == 8 61 /* 62 * A slightly more direct path to calling copyin(), but without the ability 63 * to specify a length. 64 */ 65 static int 66 copyin_checker2(uintptr_t uaddr) 67 { 68 int ret; 69 70 ret = fcntl(scratch_file, F_GETLK, (const void *)uaddr); 71 return (ret == -1 ? errno : 0); 72 } 73 #endif 74 75 #ifdef __amd64__ 76 static uintptr_t 77 get_maxuser_address(void) 78 { 79 struct kinfo_vm_layout kvm; 80 size_t len; 81 int error, mib[4]; 82 83 mib[0] = CTL_KERN; 84 mib[1] = KERN_PROC; 85 mib[2] = KERN_PROC_VM_LAYOUT; 86 mib[3] = getpid(); 87 len = sizeof(kvm); 88 error = sysctl(mib, nitems(mib), &kvm, &len, NULL, 0); 89 if (error != 0) 90 return (0); 91 92 return (kvm.kvm_max_user_addr); 93 } 94 #endif 95 96 #define FMAX ULONG_MAX 97 #if __SIZEOF_POINTER__ == 8 98 /* PR 257193 */ 99 #define ADDR_SIGNED 0x800000c000000000 100 #endif 101 102 ATF_TC_WITHOUT_HEAD(kern_copyin); 103 ATF_TC_BODY(kern_copyin, tc) 104 { 105 char template[] = "copyin.XXXXXX"; 106 uintptr_t maxuser; 107 108 #if defined(__mips__) 109 /* 110 * MIPS has different VM layout: the UVA map on mips ends the 111 * highest mapped entry at the VM_MAXUSER_ADDRESS - PAGE_SIZE, 112 * while all other arches map either stack or shared page up 113 * to the VM_MAXUSER_ADDRESS. 114 */ 115 maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE; 116 #elif defined(__amd64__) 117 maxuser = get_maxuser_address(); 118 ATF_REQUIRE(maxuser != 0); 119 #else 120 maxuser = VM_MAXUSER_ADDRESS; 121 #endif 122 123 scratch_file = mkstemp(template); 124 ATF_REQUIRE(scratch_file != -1); 125 unlink(template); 126 127 ATF_CHECK(copyin_checker(0, 0) == 0); 128 ATF_CHECK(copyin_checker(maxuser - 10, 9) == 0); 129 ATF_CHECK(copyin_checker(maxuser - 10, 10) == 0); 130 ATF_CHECK(copyin_checker(maxuser - 10, 11) == EFAULT); 131 ATF_CHECK(copyin_checker(maxuser - 1, 1) == 0); 132 ATF_CHECK(copyin_checker(maxuser, 0) == 0); 133 ATF_CHECK(copyin_checker(maxuser, 1) == EFAULT); 134 ATF_CHECK(copyin_checker(maxuser, 2) == EFAULT); 135 ATF_CHECK(copyin_checker(maxuser + 1, 0) == 0); 136 ATF_CHECK(copyin_checker(maxuser + 1, 2) == EFAULT); 137 ATF_CHECK(copyin_checker(FMAX - 10, 9) == EFAULT); 138 ATF_CHECK(copyin_checker(FMAX - 10, 10) == EFAULT); 139 ATF_CHECK(copyin_checker(FMAX - 10, 11) == EFAULT); 140 #if __SIZEOF_POINTER__ == 8 141 ATF_CHECK(copyin_checker(ADDR_SIGNED, 1) == EFAULT); 142 ATF_CHECK(copyin_checker2(ADDR_SIGNED) == EFAULT); 143 #endif 144 } 145 146 ATF_TP_ADD_TCS(tp) 147 { 148 149 ATF_TP_ADD_TC(tp, kern_copyin); 150 return (atf_no_error()); 151 } 152