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//===-- hwasan.h ------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of HWAddressSanitizer.
//
// Private Hwasan header.
//===----------------------------------------------------------------------===//
#ifndef HWASAN_H
#define HWASAN_H
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_internal_defs.h"
#include "sanitizer_common/sanitizer_stacktrace.h"
#include "hwasan_interface_internal.h"
#include "hwasan_flags.h"
#include "ubsan/ubsan_platform.h"
#ifndef HWASAN_REPLACE_OPERATORS_NEW_AND_DELETE
# define HWASAN_REPLACE_OPERATORS_NEW_AND_DELETE 1
#endif
#ifndef HWASAN_CONTAINS_UBSAN
# define HWASAN_CONTAINS_UBSAN CAN_SANITIZE_UB
#endif
#ifndef HWASAN_WITH_INTERCEPTORS
#define HWASAN_WITH_INTERCEPTORS 0
#endif
typedef u8 tag_t;
// TBI (Top Byte Ignore) feature of AArch64: bits [63:56] are ignored in address
// translation and can be used to store a tag.
const unsigned kAddressTagShift = 56;
const uptr kAddressTagMask = 0xFFUL << kAddressTagShift;
// Minimal alignment of the shadow base address. Determines the space available
// for threads and stack histories. This is an ABI constant.
const unsigned kShadowBaseAlignment = 32;
const unsigned kRecordAddrBaseTagShift = 3;
const unsigned kRecordFPShift = 48;
const unsigned kRecordFPLShift = 4;
const unsigned kRecordFPModulus = 1 << (64 - kRecordFPShift + kRecordFPLShift);
static inline tag_t GetTagFromPointer(uptr p) {
return p >> kAddressTagShift;
}
static inline uptr UntagAddr(uptr tagged_addr) {
return tagged_addr & ~kAddressTagMask;
}
static inline void *UntagPtr(const void *tagged_ptr) {
return reinterpret_cast<void *>(
UntagAddr(reinterpret_cast<uptr>(tagged_ptr)));
}
static inline uptr AddTagToPointer(uptr p, tag_t tag) {
return (p & ~kAddressTagMask) | ((uptr)tag << kAddressTagShift);
}
namespace __hwasan {
extern int hwasan_inited;
extern bool hwasan_init_is_running;
extern int hwasan_report_count;
bool ProtectRange(uptr beg, uptr end);
bool InitShadow();
void InitPrctl();
void InitThreads();
void MadviseShadow();
char *GetProcSelfMaps();
void InitializeInterceptors();
void HwasanAllocatorInit();
void HwasanAllocatorThreadFinish();
void *hwasan_malloc(uptr size, StackTrace *stack);
void *hwasan_calloc(uptr nmemb, uptr size, StackTrace *stack);
void *hwasan_realloc(void *ptr, uptr size, StackTrace *stack);
void *hwasan_reallocarray(void *ptr, uptr nmemb, uptr size, StackTrace *stack);
void *hwasan_valloc(uptr size, StackTrace *stack);
void *hwasan_pvalloc(uptr size, StackTrace *stack);
void *hwasan_aligned_alloc(uptr alignment, uptr size, StackTrace *stack);
void *hwasan_memalign(uptr alignment, uptr size, StackTrace *stack);
int hwasan_posix_memalign(void **memptr, uptr alignment, uptr size,
StackTrace *stack);
void hwasan_free(void *ptr, StackTrace *stack);
void InstallTrapHandler();
void InstallAtExitHandler();
void EnterSymbolizer();
void ExitSymbolizer();
bool IsInSymbolizer();
struct SymbolizerScope {
SymbolizerScope() { EnterSymbolizer(); }
~SymbolizerScope() { ExitSymbolizer(); }
};
// Returns a "chained" origin id, pointing to the given stack trace followed by
// the previous origin id.
u32 ChainOrigin(u32 id, StackTrace *stack);
const int STACK_TRACE_TAG_POISON = StackTrace::TAG_CUSTOM + 1;
#define GET_MALLOC_STACK_TRACE \
BufferedStackTrace stack; \
if (hwasan_inited) \
stack.Unwind(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(), \
nullptr, common_flags()->fast_unwind_on_malloc, \
common_flags()->malloc_context_size)
#define GET_FATAL_STACK_TRACE_PC_BP(pc, bp) \
BufferedStackTrace stack; \
if (hwasan_inited) \
stack.Unwind(pc, bp, nullptr, common_flags()->fast_unwind_on_fatal)
#define GET_FATAL_STACK_TRACE_HERE \
GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())
#define PRINT_CURRENT_STACK_CHECK() \
{ \
GET_FATAL_STACK_TRACE_HERE; \
stack.Print(); \
}
class ScopedThreadLocalStateBackup {
public:
ScopedThreadLocalStateBackup() { Backup(); }
~ScopedThreadLocalStateBackup() { Restore(); }
void Backup();
void Restore();
private:
u64 va_arg_overflow_size_tls;
};
void HwasanTSDInit();
void HwasanTSDThreadInit();
void HwasanOnDeadlySignal(int signo, void *info, void *context);
void UpdateMemoryUsage();
void AppendToErrorMessageBuffer(const char *buffer);
void AndroidTestTlsSlot();
} // namespace __hwasan
#define HWASAN_MALLOC_HOOK(ptr, size) \
do { \
if (&__sanitizer_malloc_hook) { \
__sanitizer_malloc_hook(ptr, size); \
} \
RunMallocHooks(ptr, size); \
} while (false)
#define HWASAN_FREE_HOOK(ptr) \
do { \
if (&__sanitizer_free_hook) { \
__sanitizer_free_hook(ptr); \
} \
RunFreeHooks(ptr); \
} while (false)
#endif // HWASAN_H
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