asan_internal.h revision 4c49666e611f06241bb8462cea7674d877241492 
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();
125
126void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp);
127
128bool AsanInterceptsSignal(int signum);
129void SetAlternateSignalStack();
130void UnsetAlternateSignalStack();
131void InstallSignalHandlers();
132
133// Wrapper for TLS/TSD.
134void AsanTSDInit(void (*destructor)(void *tsd));
135void *AsanTSDGet();
136void AsanTSDSet(void *tsd);
137
138void AppendToErrorMessageBuffer(const char *buffer);
139// asan_printf.cc
140void AsanPrintf(const char *format, ...);
141void AsanReport(const char *format, ...);
142
143// asan_poisoning.cc
144// Poisons the shadow memory for "size" bytes starting from "addr".
145void PoisonShadow(uptr addr, uptr size, u8 value);
146// Poisons the shadow memory for "redzone_size" bytes starting from
147// "addr + size".
148void PoisonShadowPartialRightRedzone(uptr addr,
149                                     uptr size,
150                                     uptr redzone_size,
151                                     u8 value);
152
153// Platfrom-specific options.
154#ifdef __APPLE__
155bool PlatformHasDifferentMemcpyAndMemmove();
156# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \
157    (PlatformHasDifferentMemcpyAndMemmove())
158#else
159# define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE true
160#endif  // __APPLE__
161
162extern uptr  FLAG_quarantine_size;
163extern s64 FLAG_demangle;
164extern bool    FLAG_symbolize;
165extern s64 FLAG_v;
166extern uptr  FLAG_redzone;
167extern s64 FLAG_debug;
168extern bool    FLAG_poison_shadow;
169extern s64 FLAG_report_globals;
170extern uptr  FLAG_malloc_context_size;
171extern bool    FLAG_replace_str;
172extern bool    FLAG_replace_intrin;
173extern bool    FLAG_replace_cfallocator;
174extern bool    FLAG_fast_unwind;
175extern bool    FLAG_use_fake_stack;
176extern uptr  FLAG_max_malloc_fill_size;
177extern s64 FLAG_exitcode;
178extern bool    FLAG_allow_user_poisoning;
179extern s64 FLAG_sleep_before_dying;
180extern bool    FLAG_handle_segv;
181extern bool    FLAG_use_sigaltstack;
182extern bool    FLAG_check_malloc_usable_size;
183extern bool    FLAG_unmap_shadow_on_exit;
184extern bool    FLAG_abort_on_error;
185
186extern int asan_inited;
187// Used to avoid infinite recursion in __asan_init().
188extern bool asan_init_is_running;
189extern void (*death_callback)(void);
190
191enum LinkerInitialized { LINKER_INITIALIZED = 0 };
192
193#define ASAN_ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
194
195#if !defined(_WIN32) || defined(__clang__)
196# define GET_CALLER_PC() (uptr)__builtin_return_address(0)
197# define GET_CURRENT_FRAME() (uptr)__builtin_frame_address(0)
198#else
199# define GET_CALLER_PC() (uptr)_ReturnAddress()
200// CaptureStackBackTrace doesn't need to know BP on Windows.
201// FIXME: This macro is still used when printing error reports though it's not
202// clear if the BP value is needed in the ASan reports on Windows.
203# define GET_CURRENT_FRAME() (uptr)0xDEADBEEF
204#endif
205
206#ifndef _WIN32
207const uptr kMmapGranularity = kPageSize;
208# define THREAD_CALLING_CONV
209typedef void* thread_return_t;
210#else
211const uptr kMmapGranularity = 1UL << 16;
212# define THREAD_CALLING_CONV __stdcall
213typedef DWORD thread_return_t;
214
215# ifndef ASAN_USE_EXTERNAL_SYMBOLIZER
216#  define ASAN_USE_EXTERNAL_SYMBOLIZER __asan_WinSymbolize
217bool __asan_WinSymbolize(const void *addr, char *out_buffer, int buffer_size);
218# endif
219#endif
220
221typedef thread_return_t (THREAD_CALLING_CONV *thread_callback_t)(void* arg);
222
223// These magic values are written to shadow for better error reporting.
224const int kAsanHeapLeftRedzoneMagic = 0xfa;
225const int kAsanHeapRightRedzoneMagic = 0xfb;
226const int kAsanHeapFreeMagic = 0xfd;
227const int kAsanStackLeftRedzoneMagic = 0xf1;
228const int kAsanStackMidRedzoneMagic = 0xf2;
229const int kAsanStackRightRedzoneMagic = 0xf3;
230const int kAsanStackPartialRedzoneMagic = 0xf4;
231const int kAsanStackAfterReturnMagic = 0xf5;
232const int kAsanUserPoisonedMemoryMagic = 0xf7;
233const int kAsanGlobalRedzoneMagic = 0xf9;
234const int kAsanInternalHeapMagic = 0xfe;
235
236static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
237static const uptr kRetiredStackFrameMagic = 0x45E0360E;
238
239// -------------------------- LowLevelAllocator ----- {{{1
240// A simple low-level memory allocator for internal use.
241class LowLevelAllocator {
242 public:
243  explicit LowLevelAllocator(LinkerInitialized) {}
244  // 'size' must be a power of two.
245  // Requires an external lock.
246  void *Allocate(uptr size);
247 private:
248  char *allocated_end_;
249  char *allocated_current_;
250};
251
252}  // namespace __asan
253
254#endif  // ASAN_INTERNAL_H
255