lib/msan/msan.h - native_client/pnacl-compiler-rt - Git at Google

 //===-- msan.h --------------------------------------------------*- C++ -*-===//
 //
 //                     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 MemorySanitizer.
 //
 // Private MSan header.
 //===----------------------------------------------------------------------===//

 #ifndef MSAN_H
 #define MSAN_H

 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_internal_defs.h"
 #include "sanitizer_common/sanitizer_stacktrace.h"
 #include "msan_interface_internal.h"
 #include "msan_flags.h"
 #include "ubsan/ubsan_platform.h"

 #ifndef MSAN_REPLACE_OPERATORS_NEW_AND_DELETE
 # define MSAN_REPLACE_OPERATORS_NEW_AND_DELETE 1
 #endif

 #ifndef MSAN_CONTAINS_UBSAN
 # define MSAN_CONTAINS_UBSAN CAN_SANITIZE_UB
 #endif

 struct MappingDesc {
   uptr start;
   uptr end;
   enum Type {
     INVALID, APP, SHADOW, ORIGIN
   } type;
   const char *name;
 };


 #if SANITIZER_LINUX && defined(__mips64)

 // Everything is above 0x00e000000000.
 const MappingDesc kMemoryLayout[] = {
     {0x000000000000ULL, 0x00a000000000ULL, MappingDesc::INVALID, "invalid"},
     {0x00a000000000ULL, 0x00c000000000ULL, MappingDesc::SHADOW, "shadow"},
     {0x00c000000000ULL, 0x00e000000000ULL, MappingDesc::ORIGIN, "origin"},
     {0x00e000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app"}};

 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x4000000000ULL)
 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x002000000000)

 #elif SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 64

 // Low memory: main binary, MAP_32BIT mappings and modules
 // High memory: heap, modules and main thread stack
 const MappingDesc kMemoryLayout[] = {
     {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "low memory"},
     {0x010000000000ULL, 0x100000000000ULL, MappingDesc::INVALID, "invalid"},
     {0x100000000000ULL, 0x310000000000ULL, MappingDesc::SHADOW, "shadow"},
     {0x310000000000ULL, 0x380000000000ULL, MappingDesc::INVALID, "invalid"},
     {0x380000000000ULL, 0x590000000000ULL, MappingDesc::ORIGIN, "origin"},
     {0x590000000000ULL, 0x600000000000ULL, MappingDesc::INVALID, "invalid"},
     {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};

 // Maps low and high app ranges to contiguous space with zero base:
 //   Low:  0000 0000 0000 - 00ff ffff ffff  ->  2000 0000 0000 - 20ff ffff ffff
 //   High: 6000 0000 0000 - 7fff ffff ffff  ->  0000 0000 0000 - 1fff ffff ffff
 #define LINEARIZE_MEM(mem) \
   (((uptr)(mem) & ~0xc00000000000ULL) ^ 0x200000000000ULL)
 #define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x100000000000ULL)
 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x280000000000)

 #elif SANITIZER_LINUX && SANITIZER_WORDSIZE == 64

 // Requries PIE binary and ASLR enabled.
 // Main thread stack and DSOs at 0x7f0000000000 (sometimes 0x7e0000000000).
 // Heap at 0x600000000000.
 const MappingDesc kMemoryLayout[] = {
     {0x000000000000ULL, 0x200000000000ULL, MappingDesc::INVALID, "invalid"},
     {0x200000000000ULL, 0x400000000000ULL, MappingDesc::SHADOW, "shadow"},
     {0x400000000000ULL, 0x600000000000ULL, MappingDesc::ORIGIN, "origin"},
     {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app"}};

 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
 #define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x200000000000ULL)

 #else
 #error "Unsupported platform"
 #endif

 const uptr kMemoryLayoutSize = sizeof(kMemoryLayout) / sizeof(kMemoryLayout[0]);

 #define MEM_TO_ORIGIN(mem) (SHADOW_TO_ORIGIN(MEM_TO_SHADOW((mem))))

 #ifndef __clang__
 __attribute__((optimize("unroll-loops")))
 #endif
 inline bool addr_is_type(uptr addr, MappingDesc::Type mapping_type) {
 // It is critical for performance that this loop is unrolled (because then it is
 // simplified into just a few constant comparisons).
 #ifdef __clang__
 #pragma unroll
 #endif
   for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
     if (kMemoryLayout[i].type == mapping_type &&
         addr >= kMemoryLayout[i].start && addr < kMemoryLayout[i].end)
       return true;
   return false;
 }

 #define MEM_IS_APP(mem) addr_is_type((uptr)(mem), MappingDesc::APP)
 #define MEM_IS_SHADOW(mem) addr_is_type((uptr)(mem), MappingDesc::SHADOW)
 #define MEM_IS_ORIGIN(mem) addr_is_type((uptr)(mem), MappingDesc::ORIGIN)

 // These constants must be kept in sync with the ones in MemorySanitizer.cc.
 const int kMsanParamTlsSize = 800;
 const int kMsanRetvalTlsSize = 800;

 namespace __msan {
 extern int msan_inited;
 extern bool msan_init_is_running;
 extern int msan_report_count;

 bool ProtectRange(uptr beg, uptr end);
 bool InitShadow(bool map_shadow, bool init_origins);
 char *GetProcSelfMaps();
 void InitializeInterceptors();

 void MsanAllocatorThreadFinish();
 void *MsanCalloc(StackTrace *stack, uptr nmemb, uptr size);
 void *MsanReallocate(StackTrace *stack, void *oldp, uptr size,
                      uptr alignment, bool zeroise);
 void MsanDeallocate(StackTrace *stack, void *ptr);
 void InstallTrapHandler();
 void InstallAtExitHandler();

 const char *GetStackOriginDescr(u32 id, uptr *pc);

 void EnterSymbolizer();
 void ExitSymbolizer();
 bool IsInSymbolizer();

 struct SymbolizerScope {
   SymbolizerScope() { EnterSymbolizer(); }
   ~SymbolizerScope() { ExitSymbolizer(); }
 };

 void MsanDie();
 void PrintWarning(uptr pc, uptr bp);
 void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin);

 void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
                    bool request_fast_unwind);

 void ReportUMR(StackTrace *stack, u32 origin);
 void ReportExpectedUMRNotFound(StackTrace *stack);
 void ReportStats();
 void ReportAtExitStatistics();
 void DescribeMemoryRange(const void *x, uptr size);
 void ReportUMRInsideAddressRange(const char *what, const void *start, uptr size,
                                  uptr offset);

 // Unpoison first n function arguments.
 void UnpoisonParam(uptr n);
 void UnpoisonThreadLocalState();

 // 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 (__msan_get_track_origins() && msan_inited)                               \
   GetStackTrace(&stack, common_flags()->malloc_context_size,                   \
                 StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(),               \
                 common_flags()->fast_unwind_on_malloc)

 #define GET_STORE_STACK_TRACE_PC_BP(pc, bp)                                    \
   BufferedStackTrace stack;                                                    \
   if (__msan_get_track_origins() > 1 && msan_inited)                           \
   GetStackTrace(&stack, flags()->store_context_size, pc, bp,                   \
                 common_flags()->fast_unwind_on_malloc)

 #define GET_FATAL_STACK_TRACE_PC_BP(pc, bp)                                    \
   BufferedStackTrace stack;                                                    \
   if (msan_inited)                                                             \
   GetStackTrace(&stack, kStackTraceMax, pc, bp,                                \
                 common_flags()->fast_unwind_on_fatal)

 #define GET_STORE_STACK_TRACE \
   GET_STORE_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())

 class ScopedThreadLocalStateBackup {
  public:
   ScopedThreadLocalStateBackup() { Backup(); }
   ~ScopedThreadLocalStateBackup() { Restore(); }
   void Backup();
   void Restore();
  private:
   u64 va_arg_overflow_size_tls;
 };

 extern void (*death_callback)(void);

 void MsanTSDInit(void (*destructor)(void *tsd));
 void *MsanTSDGet();
 void MsanTSDSet(void *tsd);
 void MsanTSDDtor(void *tsd);

 }  // namespace __msan

 #define MSAN_MALLOC_HOOK(ptr, size) \
   if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(ptr, size)
 #define MSAN_FREE_HOOK(ptr) \
   if (&__sanitizer_free_hook) __sanitizer_free_hook(ptr)

 #endif  // MSAN_H
	//===-- msan.h --------------------------------------------------- C++ --===//
	//
	// 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 MemorySanitizer.
	//
	// Private MSan header.
	//===----------------------------------------------------------------------===//

	#ifndef MSAN_H
	#define MSAN_H

	#include "sanitizer_common/sanitizer_flags.h"
	#include "sanitizer_common/sanitizer_internal_defs.h"
	#include "sanitizer_common/sanitizer_stacktrace.h"
	#include "msan_interface_internal.h"
	#include "msan_flags.h"
	#include "ubsan/ubsan_platform.h"

	#ifndef MSAN_REPLACE_OPERATORS_NEW_AND_DELETE
	# define MSAN_REPLACE_OPERATORS_NEW_AND_DELETE 1
	#endif

	#ifndef MSAN_CONTAINS_UBSAN
	# define MSAN_CONTAINS_UBSAN CAN_SANITIZE_UB
	#endif

	struct MappingDesc {
	uptr start;
	uptr end;
	enum Type {
	INVALID, APP, SHADOW, ORIGIN
	} type;
	const char *name;
	};


	#if SANITIZER_LINUX && defined(__mips64)

	// Everything is above 0x00e000000000.
	const MappingDesc kMemoryLayout[] = {
	{0x000000000000ULL, 0x00a000000000ULL, MappingDesc::INVALID, "invalid"},
	{0x00a000000000ULL, 0x00c000000000ULL, MappingDesc::SHADOW, "shadow"},
	{0x00c000000000ULL, 0x00e000000000ULL, MappingDesc::ORIGIN, "origin"},
	{0x00e000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app"}};

	#define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x4000000000ULL)
	#define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x002000000000)

	#elif SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 64

	// Low memory: main binary, MAP_32BIT mappings and modules
	// High memory: heap, modules and main thread stack
	const MappingDesc kMemoryLayout[] = {
	{0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "low memory"},
	{0x010000000000ULL, 0x100000000000ULL, MappingDesc::INVALID, "invalid"},
	{0x100000000000ULL, 0x310000000000ULL, MappingDesc::SHADOW, "shadow"},
	{0x310000000000ULL, 0x380000000000ULL, MappingDesc::INVALID, "invalid"},
	{0x380000000000ULL, 0x590000000000ULL, MappingDesc::ORIGIN, "origin"},
	{0x590000000000ULL, 0x600000000000ULL, MappingDesc::INVALID, "invalid"},
	{0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};

	// Maps low and high app ranges to contiguous space with zero base:
	// Low: 0000 0000 0000 - 00ff ffff ffff -> 2000 0000 0000 - 20ff ffff ffff
	// High: 6000 0000 0000 - 7fff ffff ffff -> 0000 0000 0000 - 1fff ffff ffff
	#define LINEARIZE_MEM(mem) \
	(((uptr)(mem) & ~0xc00000000000ULL) ^ 0x200000000000ULL)
	#define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x100000000000ULL)
	#define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x280000000000)

	#elif SANITIZER_LINUX && SANITIZER_WORDSIZE == 64

	// Requries PIE binary and ASLR enabled.
	// Main thread stack and DSOs at 0x7f0000000000 (sometimes 0x7e0000000000).
	// Heap at 0x600000000000.
	const MappingDesc kMemoryLayout[] = {
	{0x000000000000ULL, 0x200000000000ULL, MappingDesc::INVALID, "invalid"},
	{0x200000000000ULL, 0x400000000000ULL, MappingDesc::SHADOW, "shadow"},
	{0x400000000000ULL, 0x600000000000ULL, MappingDesc::ORIGIN, "origin"},
	{0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app"}};

	#define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
	#define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x200000000000ULL)

	#else
	#error "Unsupported platform"
	#endif

	const uptr kMemoryLayoutSize = sizeof(kMemoryLayout) / sizeof(kMemoryLayout[0]);

	#define MEM_TO_ORIGIN(mem) (SHADOW_TO_ORIGIN(MEM_TO_SHADOW((mem))))

	#ifndef __clang__
	__attribute__((optimize("unroll-loops")))
	#endif
	inline bool addr_is_type(uptr addr, MappingDesc::Type mapping_type) {
	// It is critical for performance that this loop is unrolled (because then it is
	// simplified into just a few constant comparisons).
	#ifdef __clang__
	#pragma unroll
	#endif
	for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
	if (kMemoryLayout[i].type == mapping_type &&
	addr >= kMemoryLayout[i].start && addr < kMemoryLayout[i].end)
	return true;
	return false;
	}

	#define MEM_IS_APP(mem) addr_is_type((uptr)(mem), MappingDesc::APP)
	#define MEM_IS_SHADOW(mem) addr_is_type((uptr)(mem), MappingDesc::SHADOW)
	#define MEM_IS_ORIGIN(mem) addr_is_type((uptr)(mem), MappingDesc::ORIGIN)

	// These constants must be kept in sync with the ones in MemorySanitizer.cc.
	const int kMsanParamTlsSize = 800;
	const int kMsanRetvalTlsSize = 800;

	namespace __msan {
	extern int msan_inited;
	extern bool msan_init_is_running;
	extern int msan_report_count;

	bool ProtectRange(uptr beg, uptr end);
	bool InitShadow(bool map_shadow, bool init_origins);
	char *GetProcSelfMaps();
	void InitializeInterceptors();

	void MsanAllocatorThreadFinish();
	void MsanCalloc(StackTrace stack, uptr nmemb, uptr size);
	void MsanReallocate(StackTrace stack, void *oldp, uptr size,
	uptr alignment, bool zeroise);
	void MsanDeallocate(StackTrace stack, void ptr);
	void InstallTrapHandler();
	void InstallAtExitHandler();

	const char GetStackOriginDescr(u32 id, uptr pc);

	void EnterSymbolizer();
	void ExitSymbolizer();
	bool IsInSymbolizer();

	struct SymbolizerScope {
	SymbolizerScope() { EnterSymbolizer(); }
	~SymbolizerScope() { ExitSymbolizer(); }
	};

	void MsanDie();
	void PrintWarning(uptr pc, uptr bp);
	void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin);

	void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
	bool request_fast_unwind);

	void ReportUMR(StackTrace *stack, u32 origin);
	void ReportExpectedUMRNotFound(StackTrace *stack);
	void ReportStats();
	void ReportAtExitStatistics();
	void DescribeMemoryRange(const void *x, uptr size);
	void ReportUMRInsideAddressRange(const char what, const void start, uptr size,
	uptr offset);

	// Unpoison first n function arguments.
	void UnpoisonParam(uptr n);
	void UnpoisonThreadLocalState();

	// 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 (__msan_get_track_origins() && msan_inited) \
	GetStackTrace(&stack, common_flags()->malloc_context_size, \
	StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(), \
	common_flags()->fast_unwind_on_malloc)

	#define GET_STORE_STACK_TRACE_PC_BP(pc, bp) \
	BufferedStackTrace stack; \
	if (__msan_get_track_origins() > 1 && msan_inited) \
	GetStackTrace(&stack, flags()->store_context_size, pc, bp, \
	common_flags()->fast_unwind_on_malloc)

	#define GET_FATAL_STACK_TRACE_PC_BP(pc, bp) \
	BufferedStackTrace stack; \
	if (msan_inited) \
	GetStackTrace(&stack, kStackTraceMax, pc, bp, \
	common_flags()->fast_unwind_on_fatal)

	#define GET_STORE_STACK_TRACE \
	GET_STORE_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())

	class ScopedThreadLocalStateBackup {
	public:
	ScopedThreadLocalStateBackup() { Backup(); }
	~ScopedThreadLocalStateBackup() { Restore(); }
	void Backup();
	void Restore();
	private:
	u64 va_arg_overflow_size_tls;
	};

	extern void (*death_callback)(void);

	void MsanTSDInit(void (destructor)(void tsd));
	void *MsanTSDGet();
	void MsanTSDSet(void *tsd);
	void MsanTSDDtor(void *tsd);

	} // namespace __msan

	#define MSAN_MALLOC_HOOK(ptr, size) \
	if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(ptr, size)
	#define MSAN_FREE_HOOK(ptr) \
	if (&__sanitizer_free_hook) __sanitizer_free_hook(ptr)

	#endif // MSAN_H