contrib/compiler-rt/lib/msan/msan.h

   1 //===-- msan.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 MemorySanitizer.
  11 //
  12 // Private MSan header.
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef MSAN_H
  16 #define MSAN_H
  17
  18 #include "sanitizer_common/sanitizer_flags.h"
  19 #include "sanitizer_common/sanitizer_internal_defs.h"
  20 #include "sanitizer_common/sanitizer_stacktrace.h"
  21 #include "msan_interface_internal.h"
  22 #include "msan_flags.h"
  23 #include "ubsan/ubsan_platform.h"
  24
  25 #ifndef MSAN_REPLACE_OPERATORS_NEW_AND_DELETE
  26 # define MSAN_REPLACE_OPERATORS_NEW_AND_DELETE 1
  27 #endif
  28
  29 #ifndef MSAN_CONTAINS_UBSAN
  30 # define MSAN_CONTAINS_UBSAN CAN_SANITIZE_UB
  31 #endif
  32
  33 struct MappingDesc {
  34   uptr start;
  35   uptr end;
  36   enum Type {
  37     INVALID, APP, SHADOW, ORIGIN
  38   } type;
  39   const char *name;
  40 };
  41
  42
  43 #if SANITIZER_LINUX && defined(__mips64)
  44
  45 // MIPS64 maps:
  46 // - 0x0000000000-0x0200000000: Program own segments
  47 // - 0xa200000000-0xc000000000: PIE program segments
  48 // - 0xe200000000-0xffffffffff: libraries segments.
  49 const MappingDesc kMemoryLayout[] = {
  50     {0x000000000000ULL, 0x000200000000ULL, MappingDesc::APP, "app-1"},
  51     {0x000200000000ULL, 0x002200000000ULL, MappingDesc::INVALID, "invalid"},
  52     {0x002200000000ULL, 0x004000000000ULL, MappingDesc::SHADOW, "shadow-2"},
  53     {0x004000000000ULL, 0x004200000000ULL, MappingDesc::INVALID, "invalid"},
  54     {0x004200000000ULL, 0x006000000000ULL, MappingDesc::ORIGIN, "origin-2"},
  55     {0x006000000000ULL, 0x006200000000ULL, MappingDesc::INVALID, "invalid"},
  56     {0x006200000000ULL, 0x008000000000ULL, MappingDesc::SHADOW, "shadow-3"},
  57     {0x008000000000ULL, 0x008200000000ULL, MappingDesc::SHADOW, "shadow-1"},
  58     {0x008200000000ULL, 0x00a000000000ULL, MappingDesc::ORIGIN, "origin-3"},
  59     {0x00a000000000ULL, 0x00a200000000ULL, MappingDesc::ORIGIN, "origin-1"},
  60     {0x00a200000000ULL, 0x00c000000000ULL, MappingDesc::APP, "app-2"},
  61     {0x00c000000000ULL, 0x00e200000000ULL, MappingDesc::INVALID, "invalid"},
  62     {0x00e200000000ULL, 0x00ffffffffffULL, MappingDesc::APP, "app-3"}};
  63
  64 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x8000000000ULL)
  65 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x2000000000ULL)
  66
  67 #elif SANITIZER_LINUX && defined(__aarch64__)
  68
  69 // The mapping describes both 39-bits, 42-bits, and 48-bits VMA.  AArch64
  70 // maps:
  71 // - 0x0000000000000-0x0000010000000: 39/42/48-bits program own segments
  72 // - 0x0005500000000-0x0005600000000: 39-bits PIE program segments
  73 // - 0x0007f80000000-0x0007fffffffff: 39-bits libraries segments
  74 // - 0x002aa00000000-0x002ab00000000: 42-bits PIE program segments
  75 // - 0x003ff00000000-0x003ffffffffff: 42-bits libraries segments
  76 // - 0x0aaaaa0000000-0x0aaab00000000: 48-bits PIE program segments
  77 // - 0xffff000000000-0x1000000000000: 48-bits libraries segments
  78 // It is fragmented in multiples segments to increase the memory available
  79 // on 42-bits (12.21% of total VMA available for 42-bits and 13.28 for
  80 // 39 bits). The 48-bits segments only cover the usual PIE/default segments
  81 // plus some more segments (262144GB total, 0.39% total VMA).
  82 const MappingDesc kMemoryLayout[] = {
  83     {0x00000000000ULL, 0x01000000000ULL, MappingDesc::INVALID, "invalid"},
  84     {0x01000000000ULL, 0x02000000000ULL, MappingDesc::SHADOW, "shadow-2"},
  85     {0x02000000000ULL, 0x03000000000ULL, MappingDesc::ORIGIN, "origin-2"},
  86     {0x03000000000ULL, 0x04000000000ULL, MappingDesc::SHADOW, "shadow-1"},
  87     {0x04000000000ULL, 0x05000000000ULL, MappingDesc::ORIGIN, "origin-1"},
  88     {0x05000000000ULL, 0x06000000000ULL, MappingDesc::APP, "app-1"},
  89     {0x06000000000ULL, 0x07000000000ULL, MappingDesc::INVALID, "invalid"},
  90     {0x07000000000ULL, 0x08000000000ULL, MappingDesc::APP, "app-2"},
  91     {0x08000000000ULL, 0x09000000000ULL, MappingDesc::INVALID, "invalid"},
  92     // The mappings below are used only for 42-bits VMA.
  93     {0x09000000000ULL, 0x0A000000000ULL, MappingDesc::SHADOW, "shadow-3"},
  94     {0x0A000000000ULL, 0x0B000000000ULL, MappingDesc::ORIGIN, "origin-3"},
  95     {0x0B000000000ULL, 0x0F000000000ULL, MappingDesc::INVALID, "invalid"},
  96     {0x0F000000000ULL, 0x10000000000ULL, MappingDesc::APP, "app-3"},
  97     {0x10000000000ULL, 0x11000000000ULL, MappingDesc::INVALID, "invalid"},
  98     {0x11000000000ULL, 0x12000000000ULL, MappingDesc::APP, "app-4"},
  99     {0x12000000000ULL, 0x17000000000ULL, MappingDesc::INVALID, "invalid"},
 100     {0x17000000000ULL, 0x18000000000ULL, MappingDesc::SHADOW, "shadow-4"},
 101     {0x18000000000ULL, 0x19000000000ULL, MappingDesc::ORIGIN, "origin-4"},
 102     {0x19000000000ULL, 0x20000000000ULL, MappingDesc::INVALID, "invalid"},
 103     {0x20000000000ULL, 0x21000000000ULL, MappingDesc::APP, "app-5"},
 104     {0x21000000000ULL, 0x26000000000ULL, MappingDesc::INVALID, "invalid"},
 105     {0x26000000000ULL, 0x27000000000ULL, MappingDesc::SHADOW, "shadow-5"},
 106     {0x27000000000ULL, 0x28000000000ULL, MappingDesc::ORIGIN, "origin-5"},
 107     {0x28000000000ULL, 0x29000000000ULL, MappingDesc::SHADOW, "shadow-7"},
 108     {0x29000000000ULL, 0x2A000000000ULL, MappingDesc::ORIGIN, "origin-7"},
 109     {0x2A000000000ULL, 0x2B000000000ULL, MappingDesc::APP, "app-6"},
 110     {0x2B000000000ULL, 0x2C000000000ULL, MappingDesc::INVALID, "invalid"},
 111     {0x2C000000000ULL, 0x2D000000000ULL, MappingDesc::SHADOW, "shadow-6"},
 112     {0x2D000000000ULL, 0x2E000000000ULL, MappingDesc::ORIGIN, "origin-6"},
 113     {0x2E000000000ULL, 0x2F000000000ULL, MappingDesc::APP, "app-7"},
 114     {0x2F000000000ULL, 0x39000000000ULL, MappingDesc::INVALID, "invalid"},
 115     {0x39000000000ULL, 0x3A000000000ULL, MappingDesc::SHADOW, "shadow-9"},
 116     {0x3A000000000ULL, 0x3B000000000ULL, MappingDesc::ORIGIN, "origin-9"},
 117     {0x3B000000000ULL, 0x3C000000000ULL, MappingDesc::APP, "app-8"},
 118     {0x3C000000000ULL, 0x3D000000000ULL, MappingDesc::INVALID, "invalid"},
 119     {0x3D000000000ULL, 0x3E000000000ULL, MappingDesc::SHADOW, "shadow-8"},
 120     {0x3E000000000ULL, 0x3F000000000ULL, MappingDesc::ORIGIN, "origin-8"},
 121     {0x3F000000000ULL, 0x40000000000ULL, MappingDesc::APP, "app-9"},
 122     // The mappings below are used only for 48-bits VMA.
 123     // TODO(unknown): 48-bit mapping ony covers the usual PIE, non-PIE
 124     // segments and some more segments totalizing 262144GB of VMA (which cover
 125     // only 0.32% of all 48-bit VMA). Memory avaliability can be increase by
 126     // adding multiple application segments like 39 and 42 mapping.
 127     {0x0040000000000ULL, 0x0041000000000ULL, MappingDesc::INVALID, "invalid"},
 128     {0x0041000000000ULL, 0x0042000000000ULL, MappingDesc::APP, "app-10"},
 129     {0x0042000000000ULL, 0x0047000000000ULL, MappingDesc::INVALID, "invalid"},
 130     {0x0047000000000ULL, 0x0048000000000ULL, MappingDesc::SHADOW, "shadow-10"},
 131     {0x0048000000000ULL, 0x0049000000000ULL, MappingDesc::ORIGIN, "origin-10"},
 132     {0x0049000000000ULL, 0x0050000000000ULL, MappingDesc::INVALID, "invalid"},
 133     {0x0050000000000ULL, 0x0051000000000ULL, MappingDesc::APP, "app-11"},
 134     {0x0051000000000ULL, 0x0056000000000ULL, MappingDesc::INVALID, "invalid"},
 135     {0x0056000000000ULL, 0x0057000000000ULL, MappingDesc::SHADOW, "shadow-11"},
 136     {0x0057000000000ULL, 0x0058000000000ULL, MappingDesc::ORIGIN, "origin-11"},
 137     {0x0058000000000ULL, 0x0059000000000ULL, MappingDesc::APP, "app-12"},
 138     {0x0059000000000ULL, 0x005E000000000ULL, MappingDesc::INVALID, "invalid"},
 139     {0x005E000000000ULL, 0x005F000000000ULL, MappingDesc::SHADOW, "shadow-12"},
 140     {0x005F000000000ULL, 0x0060000000000ULL, MappingDesc::ORIGIN, "origin-12"},
 141     {0x0060000000000ULL, 0x0061000000000ULL, MappingDesc::INVALID, "invalid"},
 142     {0x0061000000000ULL, 0x0062000000000ULL, MappingDesc::APP, "app-13"},
 143     {0x0062000000000ULL, 0x0067000000000ULL, MappingDesc::INVALID, "invalid"},
 144     {0x0067000000000ULL, 0x0068000000000ULL, MappingDesc::SHADOW, "shadow-13"},
 145     {0x0068000000000ULL, 0x0069000000000ULL, MappingDesc::ORIGIN, "origin-13"},
 146     {0x0069000000000ULL, 0x0AAAAA0000000ULL, MappingDesc::INVALID, "invalid"},
 147     {0x0AAAAA0000000ULL, 0x0AAAB00000000ULL, MappingDesc::APP, "app-14"},
 148     {0x0AAAB00000000ULL, 0x0AACAA0000000ULL, MappingDesc::INVALID, "invalid"},
 149     {0x0AACAA0000000ULL, 0x0AACB00000000ULL, MappingDesc::SHADOW, "shadow-14"},
 150     {0x0AACB00000000ULL, 0x0AADAA0000000ULL, MappingDesc::INVALID, "invalid"},
 151     {0x0AADAA0000000ULL, 0x0AADB00000000ULL, MappingDesc::ORIGIN, "origin-14"},
 152     {0x0AADB00000000ULL, 0x0FF9F00000000ULL, MappingDesc::INVALID, "invalid"},
 153     {0x0FF9F00000000ULL, 0x0FFA000000000ULL, MappingDesc::SHADOW, "shadow-15"},
 154     {0x0FFA000000000ULL, 0x0FFAF00000000ULL, MappingDesc::INVALID, "invalid"},
 155     {0x0FFAF00000000ULL, 0x0FFB000000000ULL, MappingDesc::ORIGIN, "origin-15"},
 156     {0x0FFB000000000ULL, 0x0FFFF00000000ULL, MappingDesc::INVALID, "invalid"},
 157     {0x0FFFF00000000ULL, 0x1000000000000ULL, MappingDesc::APP, "app-15"},
 158 };
 159 # define MEM_TO_SHADOW(mem) ((uptr)mem ^ 0x6000000000ULL)
 160 # define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x1000000000ULL)
 161
 162 #elif SANITIZER_LINUX && SANITIZER_PPC64
 163 const MappingDesc kMemoryLayout[] = {
 164     {0x000000000000ULL, 0x000200000000ULL, MappingDesc::APP, "low memory"},
 165     {0x000200000000ULL, 0x080000000000ULL, MappingDesc::INVALID, "invalid"},
 166     {0x080000000000ULL, 0x180200000000ULL, MappingDesc::SHADOW, "shadow"},
 167     {0x180200000000ULL, 0x1C0000000000ULL, MappingDesc::INVALID, "invalid"},
 168     {0x1C0000000000ULL, 0x2C0200000000ULL, MappingDesc::ORIGIN, "origin"},
 169     {0x2C0200000000ULL, 0x300000000000ULL, MappingDesc::INVALID, "invalid"},
 170     {0x300000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};
 171
 172 // Various kernels use different low end ranges but we can combine them into one
 173 // big range. They also use different high end ranges but we can map them all to
 174 // one range.
 175 // Maps low and high app ranges to contiguous space with zero base:
 176 //   Low:  0000 0000 0000 - 0001 ffff ffff  ->  1000 0000 0000 - 1001 ffff ffff
 177 //   High: 3000 0000 0000 - 3fff ffff ffff  ->  0000 0000 0000 - 0fff ffff ffff
 178 //   High: 4000 0000 0000 - 4fff ffff ffff  ->  0000 0000 0000 - 0fff ffff ffff
 179 //   High: 7000 0000 0000 - 7fff ffff ffff  ->  0000 0000 0000 - 0fff ffff ffff
 180 #define LINEARIZE_MEM(mem) \
 181   (((uptr)(mem) & ~0xE00000000000ULL) ^ 0x100000000000ULL)
 182 #define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x080000000000ULL)
 183 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x140000000000ULL)
 184
 185 #elif SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 64
 186
 187 // Low memory: main binary, MAP_32BIT mappings and modules
 188 // High memory: heap, modules and main thread stack
 189 const MappingDesc kMemoryLayout[] = {
 190     {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "low memory"},
 191     {0x010000000000ULL, 0x100000000000ULL, MappingDesc::INVALID, "invalid"},
 192     {0x100000000000ULL, 0x310000000000ULL, MappingDesc::SHADOW, "shadow"},
 193     {0x310000000000ULL, 0x380000000000ULL, MappingDesc::INVALID, "invalid"},
 194     {0x380000000000ULL, 0x590000000000ULL, MappingDesc::ORIGIN, "origin"},
 195     {0x590000000000ULL, 0x600000000000ULL, MappingDesc::INVALID, "invalid"},
 196     {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};
 197
 198 // Maps low and high app ranges to contiguous space with zero base:
 199 //   Low:  0000 0000 0000 - 00ff ffff ffff  ->  2000 0000 0000 - 20ff ffff ffff
 200 //   High: 6000 0000 0000 - 7fff ffff ffff  ->  0000 0000 0000 - 1fff ffff ffff
 201 #define LINEARIZE_MEM(mem) \
 202   (((uptr)(mem) & ~0xc00000000000ULL) ^ 0x200000000000ULL)
 203 #define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x100000000000ULL)
 204 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x280000000000)
 205
 206 #elif SANITIZER_NETBSD || (SANITIZER_LINUX && SANITIZER_WORDSIZE == 64)
 207
 208 #ifdef MSAN_LINUX_X86_64_OLD_MAPPING
 209 // Requries PIE binary and ASLR enabled.
 210 // Main thread stack and DSOs at 0x7f0000000000 (sometimes 0x7e0000000000).
 211 // Heap at 0x600000000000.
 212 const MappingDesc kMemoryLayout[] = {
 213     {0x000000000000ULL, 0x200000000000ULL, MappingDesc::INVALID, "invalid"},
 214     {0x200000000000ULL, 0x400000000000ULL, MappingDesc::SHADOW, "shadow"},
 215     {0x400000000000ULL, 0x600000000000ULL, MappingDesc::ORIGIN, "origin"},
 216     {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app"}};
 217
 218 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
 219 #define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x200000000000ULL)
 220 #else  // MSAN_LINUX_X86_64_OLD_MAPPING
 221 // All of the following configurations are supported.
 222 // ASLR disabled: main executable and DSOs at 0x555550000000
 223 // PIE and ASLR: main executable and DSOs at 0x7f0000000000
 224 // non-PIE: main executable below 0x100000000, DSOs at 0x7f0000000000
 225 // Heap at 0x700000000000.
 226 const MappingDesc kMemoryLayout[] = {
 227     {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app-1"},
 228     {0x010000000000ULL, 0x100000000000ULL, MappingDesc::SHADOW, "shadow-2"},
 229     {0x100000000000ULL, 0x110000000000ULL, MappingDesc::INVALID, "invalid"},
 230     {0x110000000000ULL, 0x200000000000ULL, MappingDesc::ORIGIN, "origin-2"},
 231     {0x200000000000ULL, 0x300000000000ULL, MappingDesc::SHADOW, "shadow-3"},
 232     {0x300000000000ULL, 0x400000000000ULL, MappingDesc::ORIGIN, "origin-3"},
 233     {0x400000000000ULL, 0x500000000000ULL, MappingDesc::INVALID, "invalid"},
 234     {0x500000000000ULL, 0x510000000000ULL, MappingDesc::SHADOW, "shadow-1"},
 235     {0x510000000000ULL, 0x600000000000ULL, MappingDesc::APP, "app-2"},
 236     {0x600000000000ULL, 0x610000000000ULL, MappingDesc::ORIGIN, "origin-1"},
 237     {0x610000000000ULL, 0x700000000000ULL, MappingDesc::INVALID, "invalid"},
 238     {0x700000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app-3"}};
 239 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x500000000000ULL)
 240 #define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x100000000000ULL)
 241 #endif  // MSAN_LINUX_X86_64_OLD_MAPPING
 242
 243 #else
 244 #error "Unsupported platform"
 245 #endif
 246
 247 const uptr kMemoryLayoutSize = sizeof(kMemoryLayout) / sizeof(kMemoryLayout[0]);
 248
 249 #define MEM_TO_ORIGIN(mem) (SHADOW_TO_ORIGIN(MEM_TO_SHADOW((mem))))
 250
 251 #ifndef __clang__
 252 __attribute__((optimize("unroll-loops")))
 253 #endif
 254 inline bool addr_is_type(uptr addr, MappingDesc::Type mapping_type) {
 255 // It is critical for performance that this loop is unrolled (because then it is
 256 // simplified into just a few constant comparisons).
 257 #ifdef __clang__
 258 #pragma unroll
 259 #endif
 260   for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
 261     if (kMemoryLayout[i].type == mapping_type &&
 262         addr >= kMemoryLayout[i].start && addr < kMemoryLayout[i].end)
 263       return true;
 264   return false;
 265 }
 266
 267 #define MEM_IS_APP(mem) addr_is_type((uptr)(mem), MappingDesc::APP)
 268 #define MEM_IS_SHADOW(mem) addr_is_type((uptr)(mem), MappingDesc::SHADOW)
 269 #define MEM_IS_ORIGIN(mem) addr_is_type((uptr)(mem), MappingDesc::ORIGIN)
 270
 271 // These constants must be kept in sync with the ones in MemorySanitizer.cc.
 272 const int kMsanParamTlsSize = 800;
 273 const int kMsanRetvalTlsSize = 800;
 274
 275 namespace __msan {
 276 extern int msan_inited;
 277 extern bool msan_init_is_running;
 278 extern int msan_report_count;
 279
 280 bool ProtectRange(uptr beg, uptr end);
 281 bool InitShadow(bool init_origins);
 282 char *GetProcSelfMaps();
 283 void InitializeInterceptors();
 284
 285 void MsanAllocatorInit();
 286 void MsanAllocatorThreadFinish();
 287 void MsanDeallocate(StackTrace *stack, void *ptr);
 288
 289 void *msan_malloc(uptr size, StackTrace *stack);
 290 void *msan_calloc(uptr nmemb, uptr size, StackTrace *stack);
 291 void *msan_realloc(void *ptr, uptr size, StackTrace *stack);
 292 void *msan_valloc(uptr size, StackTrace *stack);
 293 void *msan_pvalloc(uptr size, StackTrace *stack);
 294 void *msan_aligned_alloc(uptr alignment, uptr size, StackTrace *stack);
 295 void *msan_memalign(uptr alignment, uptr size, StackTrace *stack);
 296 int msan_posix_memalign(void **memptr, uptr alignment, uptr size,
 297                         StackTrace *stack);
 298
 299 void InstallTrapHandler();
 300 void InstallAtExitHandler();
 301
 302 const char *GetStackOriginDescr(u32 id, uptr *pc);
 303
 304 void EnterSymbolizer();
 305 void ExitSymbolizer();
 306 bool IsInSymbolizer();
 307
 308 struct SymbolizerScope {
 309   SymbolizerScope() { EnterSymbolizer(); }
 310   ~SymbolizerScope() { ExitSymbolizer(); }
 311 };
 312
 313 void PrintWarning(uptr pc, uptr bp);
 314 void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin);
 315
 316 void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
 317                    void *context, bool request_fast_unwind);
 318
 319 // Unpoison first n function arguments.
 320 void UnpoisonParam(uptr n);
 321 void UnpoisonThreadLocalState();
 322
 323 // Returns a "chained" origin id, pointing to the given stack trace followed by
 324 // the previous origin id.
 325 u32 ChainOrigin(u32 id, StackTrace *stack);
 326
 327 const int STACK_TRACE_TAG_POISON = StackTrace::TAG_CUSTOM + 1;
 328
 329 #define GET_MALLOC_STACK_TRACE                                            \
 330   BufferedStackTrace stack;                                               \
 331   if (__msan_get_track_origins() && msan_inited)                          \
 332   GetStackTrace(&stack, common_flags()->malloc_context_size,              \
 333                 StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(), nullptr, \
 334                 common_flags()->fast_unwind_on_malloc)
 335
 336 // For platforms which support slow unwinder only, we restrict the store context
 337 // size to 1, basically only storing the current pc. We do this because the slow
 338 // unwinder which is based on libunwind is not async signal safe and causes
 339 // random freezes in forking applications as well as in signal handlers.
 340 #define GET_STORE_STACK_TRACE_PC_BP(pc, bp)                               \
 341   BufferedStackTrace stack;                                               \
 342   if (__msan_get_track_origins() > 1 && msan_inited) {                    \
 343     if (!SANITIZER_CAN_FAST_UNWIND)                                       \
 344       GetStackTrace(&stack, Min(1, flags()->store_context_size), pc, bp,  \
 345                     nullptr, false);                                      \
 346     else                                                                  \
 347       GetStackTrace(&stack, flags()->store_context_size, pc, bp, nullptr, \
 348                     common_flags()->fast_unwind_on_malloc);               \
 349   }
 350
 351 #define GET_STORE_STACK_TRACE \
 352   GET_STORE_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())
 353
 354 #define GET_FATAL_STACK_TRACE_PC_BP(pc, bp)              \
 355   BufferedStackTrace stack;                              \
 356   if (msan_inited)                                       \
 357   GetStackTrace(&stack, kStackTraceMax, pc, bp, nullptr, \
 358                 common_flags()->fast_unwind_on_fatal)
 359
 360 #define GET_FATAL_STACK_TRACE_HERE \
 361   GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())
 362
 363 #define PRINT_CURRENT_STACK_CHECK() \
 364   {                                 \
 365     GET_FATAL_STACK_TRACE_HERE;     \
 366     stack.Print();                  \
 367   }
 368
 369 class ScopedThreadLocalStateBackup {
 370  public:
 371   ScopedThreadLocalStateBackup() { Backup(); }
 372   ~ScopedThreadLocalStateBackup() { Restore(); }
 373   void Backup();
 374   void Restore();
 375  private:
 376   u64 va_arg_overflow_size_tls;
 377 };
 378
 379 void MsanTSDInit(void (*destructor)(void *tsd));
 380 void *MsanTSDGet();
 381 void MsanTSDSet(void *tsd);
 382 void MsanTSDDtor(void *tsd);
 383
 384 }  // namespace __msan
 385
 386 #define MSAN_MALLOC_HOOK(ptr, size)       \
 387   do {                                    \
 388     if (&__sanitizer_malloc_hook) {       \
 389       UnpoisonParam(2);                   \
 390       __sanitizer_malloc_hook(ptr, size); \
 391     }                                     \
 392     RunMallocHooks(ptr, size);            \
 393   } while (false)
 394 #define MSAN_FREE_HOOK(ptr)       \
 395   do {                            \
 396     if (&__sanitizer_free_hook) { \
 397       UnpoisonParam(1);           \
 398       __sanitizer_free_hook(ptr); \
 399     }                             \
 400     RunFreeHooks(ptr);            \
 401   } while (false)
 402
 403 #endif  // MSAN_H