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//===-- asan_internal.h -----------------------------------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file is a part of AddressSanitizer, an address sanity checker.
// ASan-private header which defines various general utilities.
#include "asan_flags.h"
#include "asan_interface_internal.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_internal_defs.h"
#include "sanitizer_common/sanitizer_stacktrace.h"
#include "sanitizer_common/sanitizer_libc.h"
#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
# error "The AddressSanitizer run-time should not be"
" instrumented by AddressSanitizer"
// Build-time configuration options.
// If set, asan will intercept C++ exception api call(s).
// If set, values like allocator chunk size, as well as defaults for some flags
// will be changed towards less memory overhead.
# define ASAN_LOW_MEMORY 1
# else
# define ASAN_LOW_MEMORY 0
# endif
# ifdef PIC
# define ASAN_DYNAMIC 1
# else
# define ASAN_DYNAMIC 0
# endif
// All internal functions in asan reside inside the __asan namespace
// to avoid namespace collisions with the user programs.
// Separate namespace also makes it simpler to distinguish the asan run-time
// functions from the instrumented user code in a profile.
namespace __asan {
class AsanThread;
using __sanitizer::StackTrace;
void AsanInitFromRtl();
// asan_win.cpp
void InitializePlatformExceptionHandlers();
// Returns whether an address is a valid allocated system heap block.
// 'addr' must point to the beginning of the block.
bool IsSystemHeapAddress(uptr addr);
// asan_rtl.cpp
void PrintAddressSpaceLayout();
void NORETURN ShowStatsAndAbort();
// asan_shadow_setup.cpp
void InitializeShadowMemory();
// asan_malloc_linux.cpp / asan_malloc_mac.cpp
void ReplaceSystemMalloc();
// asan_linux.cpp / asan_mac.cpp / asan_win.cpp
uptr FindDynamicShadowStart();
void *AsanDoesNotSupportStaticLinkage();
void AsanCheckDynamicRTPrereqs();
void AsanCheckIncompatibleRT();
// Unpoisons platform-specific stacks.
// Returns true if all stacks have been unpoisoned.
bool PlatformUnpoisonStacks();
// asan_rtl.cpp
// Unpoison a region containing a stack.
// Performs a sanity check and warns if the bounds don't look right.
// The warning contains the type string to identify the stack type.
void UnpoisonStack(uptr bottom, uptr top, const char *type);
// asan_thread.cpp
AsanThread *CreateMainThread();
// Support function for __asan_(un)register_image_globals. Searches for the
// loaded image containing `needle' and then enumerates all global metadata
// structures declared in that image, applying `op' (e.g.,
// __asan_(un)register_globals) to them.
typedef void (*globals_op_fptr)(__asan_global *, uptr);
void AsanApplyToGlobals(globals_op_fptr op, const void *needle);
void AsanOnDeadlySignal(int, void *siginfo, void *context);
void ReadContextStack(void *context, uptr *stack, uptr *ssize);
void StopInitOrderChecking();
// Wrapper for TLS/TSD.
void AsanTSDInit(void (*destructor)(void *tsd));
void *AsanTSDGet();
void AsanTSDSet(void *tsd);
void PlatformTSDDtor(void *tsd);
void AppendToErrorMessageBuffer(const char *buffer);
void *AsanDlSymNext(const char *sym);
// Returns `true` iff most of ASan init process should be skipped due to the
// ASan library being loaded via `dlopen()`. Platforms may perform any
// `dlopen()` specific initialization inside this function.
bool HandleDlopenInit();
// Add convenient macro for interface functions that may be represented as
// weak hooks.
#define ASAN_MALLOC_HOOK(ptr, size) \
do { \
if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(ptr, size); \
RunMallocHooks(ptr, size); \
} while (false)
#define ASAN_FREE_HOOK(ptr) \
do { \
if (&__sanitizer_free_hook) __sanitizer_free_hook(ptr); \
RunFreeHooks(ptr); \
} while (false)
#define ASAN_ON_ERROR() \
if (&__asan_on_error) __asan_on_error()
extern int asan_inited;
// Used to avoid infinite recursion in __asan_init().
extern bool asan_init_is_running;
extern void (*death_callback)(void);
// These magic values are written to shadow for better error reporting.
const int kAsanHeapLeftRedzoneMagic = 0xfa;
const int kAsanHeapFreeMagic = 0xfd;
const int kAsanStackLeftRedzoneMagic = 0xf1;
const int kAsanStackMidRedzoneMagic = 0xf2;
const int kAsanStackRightRedzoneMagic = 0xf3;
const int kAsanStackAfterReturnMagic = 0xf5;
const int kAsanInitializationOrderMagic = 0xf6;
const int kAsanUserPoisonedMemoryMagic = 0xf7;
const int kAsanContiguousContainerOOBMagic = 0xfc;
const int kAsanStackUseAfterScopeMagic = 0xf8;
const int kAsanGlobalRedzoneMagic = 0xf9;
const int kAsanInternalHeapMagic = 0xfe;
const int kAsanArrayCookieMagic = 0xac;
const int kAsanIntraObjectRedzone = 0xbb;
const int kAsanAllocaLeftMagic = 0xca;
const int kAsanAllocaRightMagic = 0xcb;
static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
static const uptr kRetiredStackFrameMagic = 0x45E0360E;
} // namespace __asan