asan_internal.h revision cffe2f5c30c27234260d004b54152916ff0c45c6 
1//===-- asan_internal.h -----------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of AddressSanitizer, an address sanity checker.
11//
12// ASan-private header which defines various general utilities.
13//===----------------------------------------------------------------------===//
14#ifndef ASAN_INTERNAL_H
15#define ASAN_INTERNAL_H
16
17#include "sanitizer_common/sanitizer_common.h"
18#include "sanitizer_common/sanitizer_internal_defs.h"
19#include "sanitizer_common/sanitizer_libc.h"
20
21#if !defined(__linux__) && !defined(__APPLE__) && !defined(_WIN32)
22# error "This operating system is not supported by AddressSanitizer"
23#endif
24
25#if defined(_WIN32)
26extern "C" void* _ReturnAddress(void);
27# pragma intrinsic(_ReturnAddress)
28#endif  // defined(_WIN32)
29
30// Limits for integral types. We have to redefine it in case we don't
31// have stdint.h (like in Visual Studio 9).
32#if __WORDSIZE == 64
33# define __INT64_C(c)  c ## L
34# define __UINT64_C(c) c ## UL
35#else
36# define __INT64_C(c)  c ## LL
37# define __UINT64_C(c) c ## ULL
38#endif  // __WORDSIZE == 64
39#undef INT32_MIN
40#define INT32_MIN              (-2147483647-1)
41#undef INT32_MAX
42#define INT32_MAX              (2147483647)
43#undef UINT32_MAX
44#define UINT32_MAX             (4294967295U)
45#undef INT64_MIN
46#define INT64_MIN              (-__INT64_C(9223372036854775807)-1)
47#undef INT64_MAX
48#define INT64_MAX              (__INT64_C(9223372036854775807))
49#undef UINT64_MAX
50#define UINT64_MAX             (__UINT64_C(18446744073709551615))
51
52#define ASAN_DEFAULT_FAILURE_EXITCODE 1
53
54#if defined(__linux__)
55# define ASAN_LINUX   1
56#else
57# define ASAN_LINUX   0
58#endif
59
60#if defined(__APPLE__)
61# define ASAN_MAC     1
62#else
63# define ASAN_MAC     0
64#endif
65
66#if defined(_WIN32)
67# define ASAN_WINDOWS 1
68#else
69# define ASAN_WINDOWS 0
70#endif
71
72#define ASAN_POSIX (ASAN_LINUX || ASAN_MAC)
73
74#if __has_feature(address_sanitizer)
75# error "The AddressSanitizer run-time should not be"
76        " instrumented by AddressSanitizer"
77#endif
78
79// Build-time configuration options.
80
81// If set, asan will install its own SEGV signal handler.
82#ifndef ASAN_NEEDS_SEGV
83# define ASAN_NEEDS_SEGV 1
84#endif
85
86// If set, asan will intercept C++ exception api call(s).
87#ifndef ASAN_HAS_EXCEPTIONS
88# define ASAN_HAS_EXCEPTIONS 1
89#endif
90
91// If set, asan uses the values of SHADOW_SCALE and SHADOW_OFFSET
92// provided by the instrumented objects. Otherwise constants are used.
93#ifndef ASAN_FLEXIBLE_MAPPING_AND_OFFSET
94# define ASAN_FLEXIBLE_MAPPING_AND_OFFSET 0
95#endif
96
97// If set, values like allocator chunk size, as well as defaults for some flags
98// will be changed towards less memory overhead.
99#ifndef ASAN_LOW_MEMORY
100# define ASAN_LOW_MEMORY 0
101#endif
102
103// All internal functions in asan reside inside the __asan namespace
104// to avoid namespace collisions with the user programs.
105// Seperate namespace also makes it simpler to distinguish the asan run-time
106// functions from the instrumented user code in a profile.
107namespace __asan {
108
109class AsanThread;
110struct AsanStackTrace;
111
112// asan_rtl.cc
113void NORETURN ShowStatsAndAbort();
114
115// asan_globals.cc
116bool DescribeAddrIfGlobal(uptr addr);
117
118void ReplaceOperatorsNewAndDelete();
119// asan_malloc_linux.cc / asan_malloc_mac.cc
120void ReplaceSystemMalloc();
121
122// asan_linux.cc / asan_mac.cc / asan_win.cc
123void *AsanDoesNotSupportStaticLinkage();
124bool AsanShadowRangeIsAvailable();
125const char *AsanGetEnv(const char *name);
126void AsanDumpProcessMap();
127
128void *AsanMmapFixedNoReserve(uptr fixed_addr, uptr size);
129void *AsanMmapFixedReserve(uptr fixed_addr, uptr size);
130void *AsanMprotect(uptr fixed_addr, uptr size);
131
132void AsanDisableCoreDumper();
133void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp);
134
135bool AsanInterceptsSignal(int signum);
136void SetAlternateSignalStack();
137void UnsetAlternateSignalStack();
138void InstallSignalHandlers();
139uptr GetThreadSelf();
140int AtomicInc(int *a);
141u16 AtomicExchange(u16 *a, u16 new_val);
142u8 AtomicExchange(u8 *a, u8 new_val);
143
144// Wrapper for TLS/TSD.
145void AsanTSDInit(void (*destructor)(void *tsd));
146void *AsanTSDGet();
147void AsanTSDSet(void *tsd);
148
149void AppendToErrorMessageBuffer(const char *buffer);
150// asan_printf.cc
151void AsanPrintf(const char *format, ...);
152void AsanReport(const char *format, ...);
153
154// Don't use std::min and std::max, to minimize dependency on libstdc++.
155template<class T> T Min(T a, T b) { return a < b ? a : b; }
156template<class T> T Max(T a, T b) { return a > b ? a : b; }
157
158void SortArray(uptr *array, uptr size);
159
160// asan_poisoning.cc
161// Poisons the shadow memory for "size" bytes starting from "addr".
162void PoisonShadow(uptr addr, uptr size, u8 value);
163// Poisons the shadow memory for "redzone_size" bytes starting from
164// "addr + size".
165void PoisonShadowPartialRightRedzone(uptr addr,
166                                     uptr size,
167                                     uptr redzone_size,
168                                     u8 value);
169
170// Platfrom-specific options.
171#ifdef __APPLE__
172bool PlatformHasDifferentMemcpyAndMemmove();
173# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \
174    (PlatformHasDifferentMemcpyAndMemmove())
175#else
176# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true
177#endif  // __APPLE__
178
179extern uptr  FLAG_quarantine_size;
180extern s64 FLAG_demangle;
181extern bool    FLAG_symbolize;
182extern s64 FLAG_v;
183extern uptr  FLAG_redzone;
184extern s64 FLAG_debug;
185extern bool    FLAG_poison_shadow;
186extern s64 FLAG_report_globals;
187extern uptr  FLAG_malloc_context_size;
188extern bool    FLAG_replace_str;
189extern bool    FLAG_replace_intrin;
190extern bool    FLAG_replace_cfallocator;
191extern bool    FLAG_fast_unwind;
192extern bool    FLAG_use_fake_stack;
193extern uptr  FLAG_max_malloc_fill_size;
194extern s64 FLAG_exitcode;
195extern bool    FLAG_allow_user_poisoning;
196extern s64 FLAG_sleep_before_dying;
197extern bool    FLAG_handle_segv;
198extern bool    FLAG_use_sigaltstack;
199extern bool    FLAG_check_malloc_usable_size;
200extern bool    FLAG_unmap_shadow_on_exit;
201extern bool    FLAG_abort_on_error;
202
203extern int asan_inited;
204// Used to avoid infinite recursion in __asan_init().
205extern bool asan_init_is_running;
206extern void (*death_callback)(void);
207
208enum LinkerInitialized { LINKER_INITIALIZED = 0 };
209
210void SleepForSeconds(int seconds);
211void NORETURN Exit(int exitcode);
212void NORETURN Abort();
213int Atexit(void (*function)(void));
214
215#define ASAN_ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
216
217#if !defined(_WIN32) || defined(__clang__)
218# define GET_CALLER_PC() (uptr)__builtin_return_address(0)
219# define GET_CURRENT_FRAME() (uptr)__builtin_frame_address(0)
220#else
221# define GET_CALLER_PC() (uptr)_ReturnAddress()
222// CaptureStackBackTrace doesn't need to know BP on Windows.
223// FIXME: This macro is still used when printing error reports though it's not
224// clear if the BP value is needed in the ASan reports on Windows.
225# define GET_CURRENT_FRAME() (uptr)0xDEADBEEF
226#endif
227
228#ifndef _WIN32
229const uptr kMmapGranularity = kPageSize;
230# define THREAD_CALLING_CONV
231typedef void* thread_return_t;
232#else
233const uptr kMmapGranularity = 1UL << 16;
234# define THREAD_CALLING_CONV __stdcall
235typedef DWORD thread_return_t;
236
237# ifndef ASAN_USE_EXTERNAL_SYMBOLIZER
238#  define ASAN_USE_EXTERNAL_SYMBOLIZER __asan_WinSymbolize
239bool __asan_WinSymbolize(const void *addr, char *out_buffer, int buffer_size);
240# endif
241#endif
242
243typedef thread_return_t (THREAD_CALLING_CONV *thread_callback_t)(void* arg);
244
245// These magic values are written to shadow for better error reporting.
246const int kAsanHeapLeftRedzoneMagic = 0xfa;
247const int kAsanHeapRightRedzoneMagic = 0xfb;
248const int kAsanHeapFreeMagic = 0xfd;
249const int kAsanStackLeftRedzoneMagic = 0xf1;
250const int kAsanStackMidRedzoneMagic = 0xf2;
251const int kAsanStackRightRedzoneMagic = 0xf3;
252const int kAsanStackPartialRedzoneMagic = 0xf4;
253const int kAsanStackAfterReturnMagic = 0xf5;
254const int kAsanUserPoisonedMemoryMagic = 0xf7;
255const int kAsanGlobalRedzoneMagic = 0xf9;
256const int kAsanInternalHeapMagic = 0xfe;
257
258static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
259static const uptr kRetiredStackFrameMagic = 0x45E0360E;
260
261// -------------------------- LowLevelAllocator ----- {{{1
262// A simple low-level memory allocator for internal use.
263class LowLevelAllocator {
264 public:
265  explicit LowLevelAllocator(LinkerInitialized) {}
266  // 'size' must be a power of two.
267  // Requires an external lock.
268  void *Allocate(uptr size);
269 private:
270  char *allocated_end_;
271  char *allocated_current_;
272};
273
274}  // namespace __asan
275
276#endif  // ASAN_INTERNAL_H
277