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/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/exec.h>
32 #include <sys/sysctl.h>
33 #include <sys/user.h>
34 #include <sys/mman.h>
35
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
copyin_checker(uintptr_t uaddr,size_t len)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
copyin_checker2(uintptr_t uaddr)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 static int
get_vm_layout(struct kinfo_vm_layout * kvm)74 get_vm_layout(struct kinfo_vm_layout *kvm)
75 {
76 size_t len;
77 int mib[4];
78
79 mib[0] = CTL_KERN;
80 mib[1] = KERN_PROC;
81 mib[2] = KERN_PROC_VM_LAYOUT;
82 mib[3] = getpid();
83 len = sizeof(*kvm);
84
85 return (sysctl(mib, nitems(mib), kvm, &len, NULL, 0));
86 }
87
88 #define FMAX ULONG_MAX
89 #if __SIZEOF_POINTER__ == 8
90 /* PR 257193 */
91 #define ADDR_SIGNED 0x800000c000000000
92 #endif
93
94 ATF_TC_WITHOUT_HEAD(kern_copyin);
ATF_TC_BODY(kern_copyin,tc)95 ATF_TC_BODY(kern_copyin, tc)
96 {
97 char template[] = "copyin.XXXXXX";
98 struct kinfo_vm_layout kvm;
99 uintptr_t maxuser;
100 long page_size;
101 void *addr;
102 int error;
103
104 addr = MAP_FAILED;
105
106 error = get_vm_layout(&kvm);
107 ATF_REQUIRE(error == 0);
108
109 page_size = sysconf(_SC_PAGESIZE);
110 ATF_REQUIRE(page_size != (long)-1);
111
112 maxuser = kvm.kvm_max_user_addr;
113 scratch_file = mkstemp(template);
114 ATF_REQUIRE(scratch_file != -1);
115 unlink(template);
116
117 /*
118 * Since the shared page address can be randomized we need to make
119 * sure that something is mapped at the top of the user address space.
120 * Otherwise reading bytes from maxuser-X will fail rendering this test
121 * useless.
122 */
123 if (kvm.kvm_shp_addr + kvm.kvm_shp_size < maxuser) {
124 addr = mmap((void *)(maxuser - page_size), page_size, PROT_READ,
125 MAP_ANON | MAP_FIXED, -1, 0);
126 ATF_REQUIRE(addr != MAP_FAILED);
127 }
128
129 ATF_CHECK(copyin_checker(0, 0) == 0);
130 ATF_CHECK(copyin_checker(maxuser - 10, 9) == 0);
131 ATF_CHECK(copyin_checker(maxuser - 10, 10) == 0);
132 ATF_CHECK(copyin_checker(maxuser - 10, 11) == EFAULT);
133 ATF_CHECK(copyin_checker(maxuser - 1, 1) == 0);
134 ATF_CHECK(copyin_checker(maxuser, 0) == 0);
135 ATF_CHECK(copyin_checker(maxuser, 1) == EFAULT);
136 ATF_CHECK(copyin_checker(maxuser, 2) == EFAULT);
137 ATF_CHECK(copyin_checker(maxuser + 1, 0) == 0);
138 ATF_CHECK(copyin_checker(maxuser + 1, 2) == EFAULT);
139 ATF_CHECK(copyin_checker(FMAX - 10, 9) == EFAULT);
140 ATF_CHECK(copyin_checker(FMAX - 10, 10) == EFAULT);
141 ATF_CHECK(copyin_checker(FMAX - 10, 11) == EFAULT);
142 #if __SIZEOF_POINTER__ == 8
143 ATF_CHECK(copyin_checker(ADDR_SIGNED, 1) == EFAULT);
144 ATF_CHECK(copyin_checker2(ADDR_SIGNED) == EFAULT);
145 #endif
146
147 if (addr != MAP_FAILED)
148 munmap(addr, PAGE_SIZE);
149 }
150
ATF_TP_ADD_TCS(tp)151 ATF_TP_ADD_TCS(tp)
152 {
153
154 ATF_TP_ADD_TC(tp, kern_copyin);
155 return (atf_no_error());
156 }
157