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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
//===-- msan_linux.cc -----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of MemorySanitizer.
//
// Linux- and FreeBSD-specific code.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_LINUX
#include "msan.h"
#include "msan_thread.h"
#include <elf.h>
#include <link.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <unwind.h>
#include <execinfo.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_procmaps.h"
namespace __msan {
void ReportMapRange(const char *descr, uptr beg, uptr size) {
if (size > 0) {
uptr end = beg + size - 1;
VPrintf(1, "%s : %p - %p\n", descr, beg, end);
}
}
static bool CheckMemoryRangeAvailability(uptr beg, uptr size) {
if (size > 0) {
uptr end = beg + size - 1;
if (!MemoryRangeIsAvailable(beg, end)) {
Printf("FATAL: Memory range %p - %p is not available.\n", beg, end);
return false;
}
}
return true;
}
static bool ProtectMemoryRange(uptr beg, uptr size) {
if (size > 0) {
uptr end = beg + size - 1;
if (!Mprotect(beg, size)) {
Printf("FATAL: Cannot protect memory range %p - %p.\n", beg, end);
return false;
}
}
return true;
}
bool InitShadow(bool map_shadow, bool init_origins) {
// Let user know mapping parameters first.
VPrintf(1, "__msan_init %p\n", &__msan_init);
ReportMapRange("Low Memory ", kLowMemBeg, kLowMemSize);
ReportMapRange("Bad1 ", kBad1Beg, kBad1Size);
ReportMapRange("Shadow ", kShadowBeg, kShadowSize);
ReportMapRange("Bad2 ", kBad2Beg, kBad2Size);
ReportMapRange("Origins ", kOriginsBeg, kOriginsSize);
ReportMapRange("Bad3 ", kBad3Beg, kBad3Size);
ReportMapRange("High Memory", kHighMemBeg, kHighMemSize);
// Check mapping sanity (the invariant).
CHECK_EQ(kLowMemBeg, 0);
CHECK_EQ(kBad1Beg, kLowMemBeg + kLowMemSize);
CHECK_EQ(kShadowBeg, kBad1Beg + kBad1Size);
CHECK_GT(kShadowSize, 0);
CHECK_GE(kShadowSize, kLowMemSize + kHighMemSize);
CHECK_EQ(kBad2Beg, kShadowBeg + kShadowSize);
CHECK_EQ(kOriginsBeg, kBad2Beg + kBad2Size);
CHECK_EQ(kOriginsSize, kShadowSize);
CHECK_EQ(kBad3Beg, kOriginsBeg + kOriginsSize);
CHECK_EQ(kHighMemBeg, kBad3Beg + kBad3Size);
CHECK_GT(kHighMemSize, 0);
CHECK_GE(kHighMemBeg + kHighMemSize, kHighMemBeg); // Tests for no overflow.
if (kLowMemSize > 0) {
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kLowMemBeg)));
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kLowMemBeg + kLowMemSize - 1)));
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kLowMemBeg)));
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kLowMemBeg + kLowMemSize - 1)));
}
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kHighMemBeg)));
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kHighMemBeg + kHighMemSize - 1)));
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kHighMemBeg)));
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kHighMemBeg + kHighMemSize - 1)));
if (!MEM_IS_APP(&__msan_init)) {
Printf("FATAL: Code %p is out of application range. Non-PIE build?\n",
(uptr)&__msan_init);
return false;
}
if (!CheckMemoryRangeAvailability(kShadowBeg, kShadowSize) ||
(init_origins &&
!CheckMemoryRangeAvailability(kOriginsBeg, kOriginsSize)) ||
!CheckMemoryRangeAvailability(kBad1Beg, kBad1Size) ||
!CheckMemoryRangeAvailability(kBad2Beg, kBad2Size) ||
!CheckMemoryRangeAvailability(kBad3Beg, kBad3Size)) {
return false;
}
if (!ProtectMemoryRange(kBad1Beg, kBad1Size) ||
!ProtectMemoryRange(kBad2Beg, kBad2Size) ||
!ProtectMemoryRange(kBad3Beg, kBad3Size)) {
return false;
}
if (map_shadow) {
void *shadow = MmapFixedNoReserve(kShadowBeg, kShadowSize);
if (shadow != (void*)kShadowBeg) return false;
}
if (init_origins) {
void *origins = MmapFixedNoReserve(kOriginsBeg, kOriginsSize);
if (origins != (void*)kOriginsBeg) return false;
}
return true;
}
void MsanDie() {
if (common_flags()->coverage)
__sanitizer_cov_dump();
if (death_callback)
death_callback();
_exit(flags()->exit_code);
}
static void MsanAtExit(void) {
if (flags()->print_stats && (flags()->atexit || msan_report_count > 0))
ReportStats();
if (msan_report_count > 0) {
ReportAtExitStatistics();
if (flags()->exit_code) _exit(flags()->exit_code);
}
}
void InstallAtExitHandler() {
atexit(MsanAtExit);
}
// ---------------------- TSD ---------------- {{{1
static pthread_key_t tsd_key;
static bool tsd_key_inited = false;
void MsanTSDInit(void (*destructor)(void *tsd)) {
CHECK(!tsd_key_inited);
tsd_key_inited = true;
CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
}
void *MsanTSDGet() {
CHECK(tsd_key_inited);
return pthread_getspecific(tsd_key);
}
void MsanTSDSet(void *tsd) {
CHECK(tsd_key_inited);
pthread_setspecific(tsd_key, tsd);
}
void MsanTSDDtor(void *tsd) {
MsanThread *t = (MsanThread*)tsd;
if (t->destructor_iterations_ > 1) {
t->destructor_iterations_--;
CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
return;
}
MsanThread::TSDDtor(tsd);
}
} // namespace __msan
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX
|
