1 /*- 2 * Copyright (c) 2015, 2020 The FreeBSD Foundation 3 * 4 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/exec.h> 31 #include <sys/sysctl.h> 32 #include <sys/user.h> 33 #include <sys/mman.h> 34 35 #include <errno.h> 36 #include <fcntl.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 #include <atf-c.h> 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 #include <machine/vmparam.h> 45 46 static int scratch_file; 47 48 static int 49 copyin_checker(uintptr_t uaddr, size_t len) 50 { 51 ssize_t ret; 52 53 ret = write(scratch_file, (const void *)uaddr, len); 54 return (ret == -1 ? errno : 0); 55 } 56 57 #if __SIZEOF_POINTER__ == 8 58 /* 59 * A slightly more direct path to calling copyin(), but without the ability 60 * to specify a length. 61 */ 62 static int 63 copyin_checker2(uintptr_t uaddr) 64 { 65 int ret; 66 67 ret = fcntl(scratch_file, F_GETLK, (const void *)uaddr); 68 return (ret == -1 ? errno : 0); 69 } 70 #endif 71 72 static int 73 get_vm_layout(struct kinfo_vm_layout *kvm) 74 { 75 size_t len; 76 int mib[4]; 77 78 mib[0] = CTL_KERN; 79 mib[1] = KERN_PROC; 80 mib[2] = KERN_PROC_VM_LAYOUT; 81 mib[3] = getpid(); 82 len = sizeof(*kvm); 83 84 return (sysctl(mib, nitems(mib), kvm, &len, NULL, 0)); 85 } 86 87 #define FMAX ULONG_MAX 88 #if __SIZEOF_POINTER__ == 8 89 /* PR 257193 */ 90 #define ADDR_SIGNED 0x800000c000000000 91 #endif 92 93 ATF_TC_WITHOUT_HEAD(kern_copyin); 94 ATF_TC_BODY(kern_copyin, tc) 95 { 96 char template[] = "copyin.XXXXXX"; 97 struct kinfo_vm_layout kvm; 98 uintptr_t maxuser; 99 long page_size; 100 void *addr; 101 int error; 102 103 addr = MAP_FAILED; 104 105 error = get_vm_layout(&kvm); 106 ATF_REQUIRE(error == 0); 107 108 page_size = sysconf(_SC_PAGESIZE); 109 ATF_REQUIRE(page_size != (long)-1); 110 111 maxuser = kvm.kvm_max_user_addr; 112 scratch_file = mkstemp(template); 113 ATF_REQUIRE(scratch_file != -1); 114 unlink(template); 115 116 /* 117 * Since the shared page address can be randomized we need to make 118 * sure that something is mapped at the top of the user address space. 119 * Otherwise reading bytes from maxuser-X will fail rendering this test 120 * useless. 121 */ 122 if (kvm.kvm_shp_addr + kvm.kvm_shp_size < maxuser) { 123 addr = mmap((void *)(maxuser - page_size), page_size, PROT_READ, 124 MAP_ANON | MAP_FIXED, -1, 0); 125 ATF_REQUIRE(addr != MAP_FAILED); 126 } 127 128 ATF_CHECK(copyin_checker(0, 0) == 0); 129 ATF_CHECK(copyin_checker(maxuser - 10, 9) == 0); 130 ATF_CHECK(copyin_checker(maxuser - 10, 10) == 0); 131 ATF_CHECK(copyin_checker(maxuser - 10, 11) == EFAULT); 132 ATF_CHECK(copyin_checker(maxuser - 1, 1) == 0); 133 ATF_CHECK(copyin_checker(maxuser, 0) == 0); 134 ATF_CHECK(copyin_checker(maxuser, 1) == EFAULT); 135 ATF_CHECK(copyin_checker(maxuser, 2) == EFAULT); 136 ATF_CHECK(copyin_checker(maxuser + 1, 0) == 0); 137 ATF_CHECK(copyin_checker(maxuser + 1, 2) == EFAULT); 138 ATF_CHECK(copyin_checker(FMAX - 10, 9) == EFAULT); 139 ATF_CHECK(copyin_checker(FMAX - 10, 10) == EFAULT); 140 ATF_CHECK(copyin_checker(FMAX - 10, 11) == EFAULT); 141 #if __SIZEOF_POINTER__ == 8 142 ATF_CHECK(copyin_checker(ADDR_SIGNED, 1) == EFAULT); 143 ATF_CHECK(copyin_checker2(ADDR_SIGNED) == EFAULT); 144 #endif 145 146 if (addr != MAP_FAILED) 147 munmap(addr, PAGE_SIZE); 148 } 149 150 ATF_TP_ADD_TCS(tp) 151 { 152 153 ATF_TP_ADD_TC(tp, kern_copyin); 154 return (atf_no_error()); 155 } 156