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 #include <sys/mman.h> 38 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 #include <atf-c.h> 46 #include <vm/vm.h> 47 #include <vm/pmap.h> 48 #include <machine/vmparam.h> 49 50 static int scratch_file; 51 52 static int 53 copyin_checker(uintptr_t uaddr, size_t len) 54 { 55 ssize_t ret; 56 57 ret = write(scratch_file, (const void *)uaddr, len); 58 return (ret == -1 ? errno : 0); 59 } 60 61 #if __SIZEOF_POINTER__ == 8 62 /* 63 * A slightly more direct path to calling copyin(), but without the ability 64 * to specify a length. 65 */ 66 static int 67 copyin_checker2(uintptr_t uaddr) 68 { 69 int ret; 70 71 ret = fcntl(scratch_file, F_GETLK, (const void *)uaddr); 72 return (ret == -1 ? errno : 0); 73 } 74 #endif 75 76 static int 77 get_vm_layout(struct kinfo_vm_layout *kvm) 78 { 79 size_t len; 80 int mib[4]; 81 82 mib[0] = CTL_KERN; 83 mib[1] = KERN_PROC; 84 mib[2] = KERN_PROC_VM_LAYOUT; 85 mib[3] = getpid(); 86 len = sizeof(*kvm); 87 88 return (sysctl(mib, nitems(mib), kvm, &len, NULL, 0)); 89 } 90 91 #define FMAX ULONG_MAX 92 #if __SIZEOF_POINTER__ == 8 93 /* PR 257193 */ 94 #define ADDR_SIGNED 0x800000c000000000 95 #endif 96 97 ATF_TC_WITHOUT_HEAD(kern_copyin); 98 ATF_TC_BODY(kern_copyin, tc) 99 { 100 char template[] = "copyin.XXXXXX"; 101 struct kinfo_vm_layout kvm; 102 uintptr_t maxuser; 103 long page_size; 104 void *addr; 105 int error; 106 107 addr = MAP_FAILED; 108 109 error = get_vm_layout(&kvm); 110 ATF_REQUIRE(error == 0); 111 112 page_size = sysconf(_SC_PAGESIZE); 113 ATF_REQUIRE(page_size != (long)-1); 114 115 maxuser = kvm.kvm_max_user_addr; 116 scratch_file = mkstemp(template); 117 ATF_REQUIRE(scratch_file != -1); 118 unlink(template); 119 120 /* 121 * Since the shared page address can be randomized we need to make 122 * sure that something is mapped at the top of the user address space. 123 * Otherwise reading bytes from maxuser-X will fail rendering this test 124 * useless. 125 */ 126 if (kvm.kvm_shp_addr + kvm.kvm_shp_size < maxuser) { 127 addr = mmap((void *)(maxuser - page_size), page_size, PROT_READ, 128 MAP_ANON | MAP_FIXED, -1, 0); 129 ATF_REQUIRE(addr != MAP_FAILED); 130 } 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 if (addr != MAP_FAILED) 151 munmap(addr, PAGE_SIZE); 152 } 153 154 ATF_TP_ADD_TCS(tp) 155 { 156 157 ATF_TP_ADD_TC(tp, kern_copyin); 158 return (atf_no_error()); 159 } 160