1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*-
* Copyright (c) 2015, 2020 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <atf-c.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/vmparam.h>
static int scratch_file;
static int
copyin_checker(uintptr_t uaddr, size_t len)
{
ssize_t ret;
ret = write(scratch_file, (const void *)uaddr, len);
return (ret == -1 ? errno : 0);
}
#if __SIZEOF_POINTER__ == 8
/*
* A slightly more direct path to calling copyin(), but without the ability
* to specify a length.
*/
static int
copyin_checker2(uintptr_t uaddr)
{
int ret;
ret = fcntl(scratch_file, F_GETLK, (const void *)uaddr);
return (ret == -1 ? errno : 0);
}
#endif
#ifdef __amd64__
static uintptr_t
get_maxuser_address(void)
{
size_t len;
uintptr_t psstrings;
int error, mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PS_STRINGS;
mib[3] = getpid();
len = sizeof(psstrings);
error = sysctl(mib, nitems(mib), &psstrings, &len, NULL, 0);
if (error != 0)
return (0);
if (psstrings == PS_STRINGS_LA57)
return (VM_MAXUSER_ADDRESS_LA57);
if (psstrings == PS_STRINGS_LA48)
return (VM_MAXUSER_ADDRESS_LA48);
/* AMD LA48 with clipped UVA */
if (psstrings == PS_STRINGS_LA48 - PAGE_SIZE)
return (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE);
return (0);
}
#endif
#define FMAX ULONG_MAX
#if __SIZEOF_POINTER__ == 8
/* PR 257193 */
#define ADDR_SIGNED 0x800000c000000000
#endif
ATF_TC_WITHOUT_HEAD(kern_copyin);
ATF_TC_BODY(kern_copyin, tc)
{
char template[] = "copyin.XXXXXX";
uintptr_t maxuser;
#if defined(__mips__)
/*
* MIPS has different VM layout: the UVA map on mips ends the
* highest mapped entry at the VM_MAXUSER_ADDRESS - PAGE_SIZE,
* while all other arches map either stack or shared page up
* to the VM_MAXUSER_ADDRESS.
*/
maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE;
#elif defined(__amd64__)
maxuser = get_maxuser_address();
ATF_REQUIRE(maxuser != 0);
#else
maxuser = VM_MAXUSER_ADDRESS;
#endif
scratch_file = mkstemp(template);
ATF_REQUIRE(scratch_file != -1);
unlink(template);
ATF_CHECK(copyin_checker(0, 0) == 0);
ATF_CHECK(copyin_checker(maxuser - 10, 9) == 0);
ATF_CHECK(copyin_checker(maxuser - 10, 10) == 0);
ATF_CHECK(copyin_checker(maxuser - 10, 11) == EFAULT);
ATF_CHECK(copyin_checker(maxuser - 1, 1) == 0);
ATF_CHECK(copyin_checker(maxuser, 0) == 0);
ATF_CHECK(copyin_checker(maxuser, 1) == EFAULT);
ATF_CHECK(copyin_checker(maxuser, 2) == EFAULT);
ATF_CHECK(copyin_checker(maxuser + 1, 0) == 0);
ATF_CHECK(copyin_checker(maxuser + 1, 2) == EFAULT);
ATF_CHECK(copyin_checker(FMAX - 10, 9) == EFAULT);
ATF_CHECK(copyin_checker(FMAX - 10, 10) == EFAULT);
ATF_CHECK(copyin_checker(FMAX - 10, 11) == EFAULT);
#if __SIZEOF_POINTER__ == 8
ATF_CHECK(copyin_checker(ADDR_SIGNED, 1) == EFAULT);
ATF_CHECK(copyin_checker2(ADDR_SIGNED) == EFAULT);
#endif
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, kern_copyin);
return (atf_no_error());
}
|
