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
|
//===-- asan_thread.cc ------------------------------------------*- C++ -*-===//
//
// 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 AddressSanitizer, an address sanity checker.
//
// Thread-related code.
//===----------------------------------------------------------------------===//
#include "asan_allocator.h"
#include "asan_interceptors.h"
#include "asan_thread.h"
#include "asan_thread_registry.h"
#include "asan_mapping.h"
#include <sys/mman.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
namespace __asan {
AsanThread::AsanThread(LinkerInitialized x)
: fake_stack_(x),
malloc_storage_(x),
stats_(x) { }
AsanThread::AsanThread(int parent_tid, void *(*start_routine) (void *),
void *arg, AsanStackTrace *stack)
: start_routine_(start_routine),
arg_(arg) {
asanThreadRegistry().RegisterThread(this, parent_tid, stack);
}
AsanThread::~AsanThread() {
asanThreadRegistry().UnregisterThread(this);
fake_stack().Cleanup();
// We also clear the shadow on thread destruction because
// some code may still be executing in later TSD destructors
// and we don't want it to have any poisoned stack.
ClearShadowForThreadStack();
}
void AsanThread::ClearShadowForThreadStack() {
uintptr_t shadow_bot = MemToShadow(stack_bottom_);
uintptr_t shadow_top = MemToShadow(stack_top_);
real_memset((void*)shadow_bot, 0, shadow_top - shadow_bot);
}
void *AsanThread::ThreadStart() {
SetThreadStackTopAndBottom();
fake_stack_.Init(stack_size());
if (FLAG_v >= 1) {
int local = 0;
Report("T%d: stack [%p,%p) size 0x%lx; local=%p, pthread_self=%p\n",
tid(), stack_bottom_, stack_top_,
stack_top_ - stack_bottom_, &local, pthread_self());
}
CHECK(AddrIsInMem(stack_bottom_));
CHECK(AddrIsInMem(stack_top_));
ClearShadowForThreadStack();
if (!start_routine_) {
// start_routine_ == NULL if we're on the main thread or on one of the
// OS X libdispatch worker threads. But nobody is supposed to call
// ThreadStart() for the worker threads.
CHECK(tid() == 0);
return 0;
}
void *res = start_routine_(arg_);
malloc_storage().CommitBack();
if (FLAG_v >= 1) {
Report("T%d exited\n", tid());
}
return res;
}
const char *AsanThread::GetFrameNameByAddr(uintptr_t addr, uintptr_t *offset) {
uintptr_t bottom = 0;
bool is_fake_stack = false;
if (AddrIsInStack(addr)) {
bottom = stack_bottom();
} else {
bottom = fake_stack().AddrIsInFakeStack(addr);
CHECK(bottom);
is_fake_stack = true;
}
uintptr_t aligned_addr = addr & ~(__WORDSIZE/8 - 1); // align addr.
uintptr_t *ptr = (uintptr_t*)aligned_addr;
while (ptr >= (uintptr_t*)bottom) {
if (ptr[0] == kCurrentStackFrameMagic ||
(is_fake_stack && ptr[0] == kRetiredStackFrameMagic)) {
*offset = addr - (uintptr_t)ptr;
return (const char*)ptr[1];
}
ptr--;
}
*offset = 0;
return "UNKNOWN";
}
void AsanThread::SetThreadStackTopAndBottom() {
#ifdef __APPLE__
size_t stacksize = pthread_get_stacksize_np(pthread_self());
void *stackaddr = pthread_get_stackaddr_np(pthread_self());
stack_top_ = (uintptr_t)stackaddr;
stack_bottom_ = stack_top_ - stacksize;
int local;
CHECK(AddrIsInStack((uintptr_t)&local));
#else
pthread_attr_t attr;
CHECK(pthread_getattr_np(pthread_self(), &attr) == 0);
size_t stacksize = 0;
void *stackaddr = NULL;
pthread_attr_getstack(&attr, &stackaddr, &stacksize);
pthread_attr_destroy(&attr);
stack_top_ = (uintptr_t)stackaddr + stacksize;
stack_bottom_ = (uintptr_t)stackaddr;
// When running with unlimited stack size, we still want to set some limit.
// The unlimited stack size is caused by 'ulimit -s unlimited'.
// Also, for some reason, GNU make spawns subrocesses with unlimited stack.
if (stacksize > kMaxThreadStackSize) {
stack_bottom_ = stack_top_ - kMaxThreadStackSize;
}
CHECK(AddrIsInStack((uintptr_t)&attr));
#endif
}
} // namespace __asan
|
