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
|
//===-- asan_debugging.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 AddressSanitizer, an address sanity checker.
//
// This file contains various functions that are generally useful to call when
// using a debugger (LLDB, GDB).
//===----------------------------------------------------------------------===//
#include "asan_allocator.h"
#include "asan_descriptions.h"
#include "asan_flags.h"
#include "asan_internal.h"
#include "asan_mapping.h"
#include "asan_report.h"
#include "asan_thread.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
namespace {
using namespace __asan;
static void FindInfoForStackVar(uptr addr, const char *frame_descr, uptr offset,
char *name, uptr name_size,
uptr *region_address, uptr *region_size) {
InternalMmapVector<StackVarDescr> vars;
vars.reserve(16);
if (!ParseFrameDescription(frame_descr, &vars)) {
return;
}
for (uptr i = 0; i < vars.size(); i++) {
if (offset <= vars[i].beg + vars[i].size) {
// We use name_len + 1 because strlcpy will guarantee a \0 at the end, so
// if we're limiting the copy due to name_len, we add 1 to ensure we copy
// the whole name and then terminate with '\0'.
internal_strlcpy(name, vars[i].name_pos,
Min(name_size, vars[i].name_len + 1));
*region_address = addr - (offset - vars[i].beg);
*region_size = vars[i].size;
return;
}
}
}
uptr AsanGetStack(uptr addr, uptr *trace, u32 size, u32 *thread_id,
bool alloc_stack) {
AsanChunkView chunk = FindHeapChunkByAddress(addr);
if (!chunk.IsValid()) return 0;
StackTrace stack(nullptr, 0);
if (alloc_stack) {
if (chunk.AllocTid() == kInvalidTid) return 0;
stack = StackDepotGet(chunk.GetAllocStackId());
if (thread_id) *thread_id = chunk.AllocTid();
} else {
if (chunk.FreeTid() == kInvalidTid) return 0;
stack = StackDepotGet(chunk.GetFreeStackId());
if (thread_id) *thread_id = chunk.FreeTid();
}
if (trace && size) {
size = Min(size, Min(stack.size, kStackTraceMax));
for (uptr i = 0; i < size; i++)
trace[i] = StackTrace::GetPreviousInstructionPc(stack.trace[i]);
return size;
}
return 0;
}
} // namespace
SANITIZER_INTERFACE_ATTRIBUTE
const char *__asan_locate_address(uptr addr, char *name, uptr name_size,
uptr *region_address_ptr,
uptr *region_size_ptr) {
AddressDescription descr(addr);
uptr region_address = 0;
uptr region_size = 0;
const char *region_kind = nullptr;
if (name && name_size > 0) name[0] = 0;
if (auto shadow = descr.AsShadow()) {
// region_{address,size} are already 0
switch (shadow->kind) {
case kShadowKindLow:
region_kind = "low shadow";
break;
case kShadowKindGap:
region_kind = "shadow gap";
break;
case kShadowKindHigh:
region_kind = "high shadow";
break;
}
} else if (auto heap = descr.AsHeap()) {
region_kind = "heap";
region_address = heap->chunk_access.chunk_begin;
region_size = heap->chunk_access.chunk_size;
} else if (auto stack = descr.AsStack()) {
region_kind = "stack";
if (!stack->frame_descr) {
// region_{address,size} are already 0
} else {
FindInfoForStackVar(addr, stack->frame_descr, stack->offset, name,
name_size, ®ion_address, ®ion_size);
}
} else if (auto global = descr.AsGlobal()) {
region_kind = "global";
auto &g = global->globals[0];
internal_strlcpy(name, g.name, name_size);
region_address = g.beg;
region_size = g.size;
} else {
// region_{address,size} are already 0
region_kind = "heap-invalid";
}
CHECK(region_kind);
if (region_address_ptr) *region_address_ptr = region_address;
if (region_size_ptr) *region_size_ptr = region_size;
return region_kind;
}
SANITIZER_INTERFACE_ATTRIBUTE
uptr __asan_get_alloc_stack(uptr addr, uptr *trace, uptr size, u32 *thread_id) {
return AsanGetStack(addr, trace, size, thread_id, /* alloc_stack */ true);
}
SANITIZER_INTERFACE_ATTRIBUTE
uptr __asan_get_free_stack(uptr addr, uptr *trace, uptr size, u32 *thread_id) {
return AsanGetStack(addr, trace, size, thread_id, /* alloc_stack */ false);
}
SANITIZER_INTERFACE_ATTRIBUTE
void __asan_get_shadow_mapping(uptr *shadow_scale, uptr *shadow_offset) {
if (shadow_scale)
*shadow_scale = ASAN_SHADOW_SCALE;
if (shadow_offset)
*shadow_offset = ASAN_SHADOW_OFFSET;
}
|
