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
|
//===-- tsan_platform_posix.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
// POSIX-specific code.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_POSIX
# include <dlfcn.h>
# include "sanitizer_common/sanitizer_common.h"
# include "sanitizer_common/sanitizer_errno.h"
# include "sanitizer_common/sanitizer_libc.h"
# include "sanitizer_common/sanitizer_procmaps.h"
# include "tsan_platform.h"
# include "tsan_rtl.h"
namespace __tsan {
static const char kShadowMemoryMappingWarning[] =
"FATAL: %s can not madvise shadow region [%zx, %zx] with %s (errno: %d)\n";
static const char kShadowMemoryMappingHint[] =
"HINT: if %s is not supported in your environment, you may set "
"TSAN_OPTIONS=%s=0\n";
# if !SANITIZER_GO
static void DontDumpShadow(uptr addr, uptr size) {
if (common_flags()->use_madv_dontdump)
if (!DontDumpShadowMemory(addr, size)) {
Printf(kShadowMemoryMappingWarning, SanitizerToolName, addr, addr + size,
"MADV_DONTDUMP", errno);
Printf(kShadowMemoryMappingHint, "MADV_DONTDUMP", "use_madv_dontdump");
Die();
}
}
void InitializeShadowMemory() {
// Map memory shadow.
if (!MmapFixedSuperNoReserve(ShadowBeg(), ShadowEnd() - ShadowBeg(),
"shadow")) {
Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
Die();
}
// This memory range is used for thread stacks and large user mmaps.
// Frequently a thread uses only a small part of stack and similarly
// a program uses a small part of large mmap. On some programs
// we see 20% memory usage reduction without huge pages for this range.
DontDumpShadow(ShadowBeg(), ShadowEnd() - ShadowBeg());
DPrintf("memory shadow: %zx-%zx (%zuGB)\n",
ShadowBeg(), ShadowEnd(),
(ShadowEnd() - ShadowBeg()) >> 30);
// Map meta shadow.
const uptr meta = MetaShadowBeg();
const uptr meta_size = MetaShadowEnd() - meta;
if (!MmapFixedSuperNoReserve(meta, meta_size, "meta shadow")) {
Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
Die();
}
DontDumpShadow(meta, meta_size);
DPrintf("meta shadow: %zx-%zx (%zuGB)\n",
meta, meta + meta_size, meta_size >> 30);
InitializeShadowMemoryPlatform();
on_initialize = reinterpret_cast<void (*)(void)>(
dlsym(RTLD_DEFAULT, "__tsan_on_initialize"));
on_finalize =
reinterpret_cast<int (*)(int)>(dlsym(RTLD_DEFAULT, "__tsan_on_finalize"));
}
static bool TryProtectRange(uptr beg, uptr end) {
CHECK_LE(beg, end);
if (beg == end)
return true;
return beg == (uptr)MmapFixedNoAccess(beg, end - beg);
}
static void ProtectRange(uptr beg, uptr end) {
if (!TryProtectRange(beg, end)) {
Printf("FATAL: ThreadSanitizer can not protect [%zx,%zx]\n", beg, end);
Printf("FATAL: Make sure you are not using unlimited stack\n");
Die();
}
}
void CheckAndProtect() {
// Ensure that the binary is indeed compiled with -pie.
MemoryMappingLayout proc_maps(true);
MemoryMappedSegment segment;
while (proc_maps.Next(&segment)) {
if (IsAppMem(segment.start)) continue;
if (segment.start >= HeapMemEnd() && segment.start < HeapEnd()) continue;
if (segment.protection == 0) // Zero page or mprotected.
continue;
if (segment.start >= VdsoBeg()) // vdso
break;
Printf("FATAL: ThreadSanitizer: unexpected memory mapping 0x%zx-0x%zx\n",
segment.start, segment.end);
Die();
}
# if SANITIZER_IOS && !SANITIZER_IOSSIM
ProtectRange(HeapMemEnd(), ShadowBeg());
ProtectRange(ShadowEnd(), MetaShadowBeg());
ProtectRange(MetaShadowEnd(), HiAppMemBeg());
# else
ProtectRange(LoAppMemEnd(), ShadowBeg());
ProtectRange(ShadowEnd(), MetaShadowBeg());
if (MidAppMemBeg()) {
ProtectRange(MetaShadowEnd(), MidAppMemBeg());
ProtectRange(MidAppMemEnd(), HeapMemBeg());
} else {
ProtectRange(MetaShadowEnd(), HeapMemBeg());
}
ProtectRange(HeapEnd(), HiAppMemBeg());
# endif
# if defined(__s390x__)
// Protect the rest of the address space.
const uptr user_addr_max_l4 = 0x0020000000000000ull;
const uptr user_addr_max_l5 = 0xfffffffffffff000ull;
// All the maintained s390x kernels support at least 4-level page tables.
ProtectRange(HiAppMemEnd(), user_addr_max_l4);
// Older s390x kernels may not support 5-level page tables.
TryProtectRange(user_addr_max_l4, user_addr_max_l5);
#endif
}
#endif
} // namespace __tsan
#endif // SANITIZER_POSIX
|
