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 <errno.h> 37 #include <fcntl.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <atf-c.h> 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 #include <machine/vmparam.h> 46 47 static int scratch_file; 48 49 static int 50 copyin_checker(uintptr_t uaddr, size_t len) 51 { 52 ssize_t ret; 53 54 ret = write(scratch_file, (const void *)uaddr, len); 55 return (ret == -1 ? errno : 0); 56 } 57 58 #if __SIZEOF_POINTER__ == 8 59 /* 60 * A slightly more direct path to calling copyin(), but without the ability 61 * to specify a length. 62 */ 63 static int 64 copyin_checker2(uintptr_t uaddr) 65 { 66 int ret; 67 68 ret = fcntl(scratch_file, F_GETLK, (const void *)uaddr); 69 return (ret == -1 ? errno : 0); 70 } 71 #endif 72 73 #ifdef __amd64__ 74 static uintptr_t 75 get_maxuser_address(void) 76 { 77 size_t len; 78 uintptr_t psstrings; 79 int error, mib[4]; 80 81 mib[0] = CTL_KERN; 82 mib[1] = KERN_PROC; 83 mib[2] = KERN_PROC_PS_STRINGS; 84 mib[3] = getpid(); 85 len = sizeof(psstrings); 86 error = sysctl(mib, nitems(mib), &psstrings, &len, NULL, 0); 87 if (error != 0) 88 return (0); 89 90 if (psstrings == PS_STRINGS_LA57) 91 return (VM_MAXUSER_ADDRESS_LA57); 92 if (psstrings == PS_STRINGS_LA48) 93 return (VM_MAXUSER_ADDRESS_LA48); 94 /* AMD LA48 with clipped UVA */ 95 if (psstrings == PS_STRINGS_LA48 - PAGE_SIZE) 96 return (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE); 97 return (0); 98 } 99 #endif 100 101 #define FMAX ULONG_MAX 102 #if __SIZEOF_POINTER__ == 8 103 /* PR 257193 */ 104 #define ADDR_SIGNED 0x800000c000000000 105 #endif 106 107 ATF_TC_WITHOUT_HEAD(kern_copyin); 108 ATF_TC_BODY(kern_copyin, tc) 109 { 110 char template[] = "copyin.XXXXXX"; 111 uintptr_t maxuser; 112 113 #if defined(__mips__) 114 /* 115 * MIPS has different VM layout: the UVA map on mips ends the 116 * highest mapped entry at the VM_MAXUSER_ADDRESS - PAGE_SIZE, 117 * while all other arches map either stack or shared page up 118 * to the VM_MAXUSER_ADDRESS. 119 */ 120 maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE; 121 #elif defined(__amd64__) 122 maxuser = get_maxuser_address(); 123 ATF_REQUIRE(maxuser != 0); 124 #else 125 maxuser = VM_MAXUSER_ADDRESS; 126 #endif 127 128 scratch_file = mkstemp(template); 129 ATF_REQUIRE(scratch_file != -1); 130 unlink(template); 131 132 ATF_CHECK(copyin_checker(0, 0) == 0); 133 ATF_CHECK(copyin_checker(maxuser - 10, 9) == 0); 134 ATF_CHECK(copyin_checker(maxuser - 10, 10) == 0); 135 ATF_CHECK(copyin_checker(maxuser - 10, 11) == EFAULT); 136 ATF_CHECK(copyin_checker(maxuser - 1, 1) == 0); 137 ATF_CHECK(copyin_checker(maxuser, 0) == 0); 138 ATF_CHECK(copyin_checker(maxuser, 1) == EFAULT); 139 ATF_CHECK(copyin_checker(maxuser, 2) == EFAULT); 140 ATF_CHECK(copyin_checker(maxuser + 1, 0) == 0); 141 ATF_CHECK(copyin_checker(maxuser + 1, 2) == EFAULT); 142 ATF_CHECK(copyin_checker(FMAX - 10, 9) == EFAULT); 143 ATF_CHECK(copyin_checker(FMAX - 10, 10) == EFAULT); 144 ATF_CHECK(copyin_checker(FMAX - 10, 11) == EFAULT); 145 #if __SIZEOF_POINTER__ == 8 146 ATF_CHECK(copyin_checker(ADDR_SIGNED, 1) == EFAULT); 147 ATF_CHECK(copyin_checker2(ADDR_SIGNED) == EFAULT); 148 #endif 149 } 150 151 ATF_TP_ADD_TCS(tp) 152 { 153 154 ATF_TP_ADD_TC(tp, kern_copyin); 155 return (atf_no_error()); 156 } 157