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
|
//===-- asan_posix.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 AddressSanitizer, an address sanity checker.
//
// Posix-specific details.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_POSIX
#include "asan_internal.h"
#include "asan_interceptors.h"
#include "asan_mapping.h"
#include "asan_report.h"
#include "asan_stack.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_procmaps.h"
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
namespace __asan {
void AsanOnSIGSEGV(int, void *siginfo, void *context) {
ScopedDeadlySignal signal_scope(GetCurrentThread());
uptr addr = (uptr)((siginfo_t*)siginfo)->si_addr;
int code = (int)((siginfo_t*)siginfo)->si_code;
// Write the first message using the bullet-proof write.
if (13 != internal_write(2, "ASAN:SIGSEGV\n", 13)) Die();
uptr pc, sp, bp;
GetPcSpBp(context, &pc, &sp, &bp);
// Access at a reasonable offset above SP, or slightly below it (to account
// for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is
// probably a stack overflow.
// We also check si_code to filter out SEGV caused by something else other
// then hitting the guard page or unmapped memory, like, for example,
// unaligned memory access.
if (addr + 512 > sp && addr < sp + 0xFFFF &&
(code == si_SEGV_MAPERR || code == si_SEGV_ACCERR))
ReportStackOverflow(pc, sp, bp, context, addr);
else
ReportSIGSEGV("SEGV", pc, sp, bp, context, addr);
}
// ---------------------- TSD ---------------- {{{1
static pthread_key_t tsd_key;
static bool tsd_key_inited = false;
void AsanTSDInit(void (*destructor)(void *tsd)) {
CHECK(!tsd_key_inited);
tsd_key_inited = true;
CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
}
void *AsanTSDGet() {
CHECK(tsd_key_inited);
return pthread_getspecific(tsd_key);
}
void AsanTSDSet(void *tsd) {
CHECK(tsd_key_inited);
pthread_setspecific(tsd_key, tsd);
}
void PlatformTSDDtor(void *tsd) {
AsanThreadContext *context = (AsanThreadContext*)tsd;
if (context->destructor_iterations > 1) {
context->destructor_iterations--;
CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
return;
}
AsanThread::TSDDtor(tsd);
}
} // namespace __asan
#endif // SANITIZER_POSIX
|
