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

   1 //===-- msan.h --------------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of MemorySanitizer.
  10 //
  11 // Private MSan header.
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef MSAN_H
  15 #define MSAN_H
  16
  17 #include "sanitizer_common/sanitizer_flags.h"
  18 #include "sanitizer_common/sanitizer_internal_defs.h"
  19 #include "sanitizer_common/sanitizer_stacktrace.h"
  20 #include "msan_interface_internal.h"
  21 #include "msan_flags.h"
  22 #include "ubsan/ubsan_platform.h"
  23
  24 #ifndef MSAN_REPLACE_OPERATORS_NEW_AND_DELETE
  25 # define MSAN_REPLACE_OPERATORS_NEW_AND_DELETE 1
  26 #endif
  27
  28 #ifndef MSAN_CONTAINS_UBSAN
  29 # define MSAN_CONTAINS_UBSAN CAN_SANITIZE_UB
  30 #endif
  31
  32 struct MappingDesc {
  33   uptr start;
  34   uptr end;
  35   enum Type {
  36     INVALID, APP, SHADOW, ORIGIN
  37   } type;
  38   const char *name;
  39 };
  40
  41
  42 #if SANITIZER_LINUX && defined(__mips64)
  43
  44 // MIPS64 maps:
  45 // - 0x0000000000-0x0200000000: Program own segments
  46 // - 0xa200000000-0xc000000000: PIE program segments
  47 // - 0xe200000000-0xffffffffff: libraries segments.
  48 const MappingDesc kMemoryLayout[] = {
  49     {0x000000000000ULL, 0x000200000000ULL, MappingDesc::APP, "app-1"},
  50     {0x000200000000ULL, 0x002200000000ULL, MappingDesc::INVALID, "invalid"},
  51     {0x002200000000ULL, 0x004000000000ULL, MappingDesc::SHADOW, "shadow-2"},
  52     {0x004000000000ULL, 0x004200000000ULL, MappingDesc::INVALID, "invalid"},
  53     {0x004200000000ULL, 0x006000000000ULL, MappingDesc::ORIGIN, "origin-2"},
  54     {0x006000000000ULL, 0x006200000000ULL, MappingDesc::INVALID, "invalid"},
  55     {0x006200000000ULL, 0x008000000000ULL, MappingDesc::SHADOW, "shadow-3"},
  56     {0x008000000000ULL, 0x008200000000ULL, MappingDesc::SHADOW, "shadow-1"},
  57     {0x008200000000ULL, 0x00a000000000ULL, MappingDesc::ORIGIN, "origin-3"},
  58     {0x00a000000000ULL, 0x00a200000000ULL, MappingDesc::ORIGIN, "origin-1"},
  59     {0x00a200000000ULL, 0x00c000000000ULL, MappingDesc::APP, "app-2"},
  60     {0x00c000000000ULL, 0x00e200000000ULL, MappingDesc::INVALID, "invalid"},
  61     {0x00e200000000ULL, 0x00ffffffffffULL, MappingDesc::APP, "app-3"}};
  62
  63 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x8000000000ULL)
  64 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x2000000000ULL)
  65
  66 #elif SANITIZER_LINUX && defined(__aarch64__)
  67
  68 // The mapping describes both 39-bits, 42-bits, and 48-bits VMA.  AArch64
  69 // maps:
  70 // - 0x0000000000000-0x0000010000000: 39/42/48-bits program own segments
  71 // - 0x0005500000000-0x0005600000000: 39-bits PIE program segments
  72 // - 0x0007f80000000-0x0007fffffffff: 39-bits libraries segments
  73 // - 0x002aa00000000-0x002ab00000000: 42-bits PIE program segments
  74 // - 0x003ff00000000-0x003ffffffffff: 42-bits libraries segments
  75 // - 0x0aaaaa0000000-0x0aaab00000000: 48-bits PIE program segments
  76 // - 0xffff000000000-0x1000000000000: 48-bits libraries segments
  77 // It is fragmented in multiples segments to increase the memory available
  78 // on 42-bits (12.21% of total VMA available for 42-bits and 13.28 for
  79 // 39 bits). The 48-bits segments only cover the usual PIE/default segments
  80 // plus some more segments (262144GB total, 0.39% total VMA).
  81 const MappingDesc kMemoryLayout[] = {
  82     {0x00000000000ULL, 0x01000000000ULL, MappingDesc::INVALID, "invalid"},
  83     {0x01000000000ULL, 0x02000000000ULL, MappingDesc::SHADOW, "shadow-2"},
  84     {0x02000000000ULL, 0x03000000000ULL, MappingDesc::ORIGIN, "origin-2"},
  85     {0x03000000000ULL, 0x04000000000ULL, MappingDesc::SHADOW, "shadow-1"},
  86     {0x04000000000ULL, 0x05000000000ULL, MappingDesc::ORIGIN, "origin-1"},
  87     {0x05000000000ULL, 0x06000000000ULL, MappingDesc::APP, "app-1"},
  88     {0x06000000000ULL, 0x07000000000ULL, MappingDesc::INVALID, "invalid"},
  89     {0x07000000000ULL, 0x08000000000ULL, MappingDesc::APP, "app-2"},
  90     {0x08000000000ULL, 0x09000000000ULL, MappingDesc::INVALID, "invalid"},
  91     // The mappings below are used only for 42-bits VMA.
  92     {0x09000000000ULL, 0x0A000000000ULL, MappingDesc::SHADOW, "shadow-3"},
  93     {0x0A000000000ULL, 0x0B000000000ULL, MappingDesc::ORIGIN, "origin-3"},
  94     {0x0B000000000ULL, 0x0F000000000ULL, MappingDesc::INVALID, "invalid"},
  95     {0x0F000000000ULL, 0x10000000000ULL, MappingDesc::APP, "app-3"},
  96     {0x10000000000ULL, 0x11000000000ULL, MappingDesc::INVALID, "invalid"},
  97     {0x11000000000ULL, 0x12000000000ULL, MappingDesc::APP, "app-4"},
  98     {0x12000000000ULL, 0x17000000000ULL, MappingDesc::INVALID, "invalid"},
  99     {0x17000000000ULL, 0x18000000000ULL, MappingDesc::SHADOW, "shadow-4"},
 100     {0x18000000000ULL, 0x19000000000ULL, MappingDesc::ORIGIN, "origin-4"},
 101     {0x19000000000ULL, 0x20000000000ULL, MappingDesc::INVALID, "invalid"},
 102     {0x20000000000ULL, 0x21000000000ULL, MappingDesc::APP, "app-5"},
 103     {0x21000000000ULL, 0x26000000000ULL, MappingDesc::INVALID, "invalid"},
 104     {0x26000000000ULL, 0x27000000000ULL, MappingDesc::SHADOW, "shadow-5"},
 105     {0x27000000000ULL, 0x28000000000ULL, MappingDesc::ORIGIN, "origin-5"},
 106     {0x28000000000ULL, 0x29000000000ULL, MappingDesc::SHADOW, "shadow-7"},
 107     {0x29000000000ULL, 0x2A000000000ULL, MappingDesc::ORIGIN, "origin-7"},
 108     {0x2A000000000ULL, 0x2B000000000ULL, MappingDesc::APP, "app-6"},
 109     {0x2B000000000ULL, 0x2C000000000ULL, MappingDesc::INVALID, "invalid"},
 110     {0x2C000000000ULL, 0x2D000000000ULL, MappingDesc::SHADOW, "shadow-6"},
 111     {0x2D000000000ULL, 0x2E000000000ULL, MappingDesc::ORIGIN, "origin-6"},
 112     {0x2E000000000ULL, 0x2F000000000ULL, MappingDesc::APP, "app-7"},
 113     {0x2F000000000ULL, 0x39000000000ULL, MappingDesc::INVALID, "invalid"},
 114     {0x39000000000ULL, 0x3A000000000ULL, MappingDesc::SHADOW, "shadow-9"},
 115     {0x3A000000000ULL, 0x3B000000000ULL, MappingDesc::ORIGIN, "origin-9"},
 116     {0x3B000000000ULL, 0x3C000000000ULL, MappingDesc::APP, "app-8"},
 117     {0x3C000000000ULL, 0x3D000000000ULL, MappingDesc::INVALID, "invalid"},
 118     {0x3D000000000ULL, 0x3E000000000ULL, MappingDesc::SHADOW, "shadow-8"},
 119     {0x3E000000000ULL, 0x3F000000000ULL, MappingDesc::ORIGIN, "origin-8"},
 120     {0x3F000000000ULL, 0x40000000000ULL, MappingDesc::APP, "app-9"},
 121     // The mappings below are used only for 48-bits VMA.
 122     // TODO(unknown): 48-bit mapping ony covers the usual PIE, non-PIE
 123     // segments and some more segments totalizing 262144GB of VMA (which cover
 124     // only 0.32% of all 48-bit VMA). Memory avaliability can be increase by
 125     // adding multiple application segments like 39 and 42 mapping.
 126     {0x0040000000000ULL, 0x0041000000000ULL, MappingDesc::INVALID, "invalid"},
 127     {0x0041000000000ULL, 0x0042000000000ULL, MappingDesc::APP, "app-10"},
 128     {0x0042000000000ULL, 0x0047000000000ULL, MappingDesc::INVALID, "invalid"},
 129     {0x0047000000000ULL, 0x0048000000000ULL, MappingDesc::SHADOW, "shadow-10"},
 130     {0x0048000000000ULL, 0x0049000000000ULL, MappingDesc::ORIGIN, "origin-10"},
 131     {0x0049000000000ULL, 0x0050000000000ULL, MappingDesc::INVALID, "invalid"},
 132     {0x0050000000000ULL, 0x0051000000000ULL, MappingDesc::APP, "app-11"},
 133     {0x0051000000000ULL, 0x0056000000000ULL, MappingDesc::INVALID, "invalid"},
 134     {0x0056000000000ULL, 0x0057000000000ULL, MappingDesc::SHADOW, "shadow-11"},
 135     {0x0057000000000ULL, 0x0058000000000ULL, MappingDesc::ORIGIN, "origin-11"},
 136     {0x0058000000000ULL, 0x0059000000000ULL, MappingDesc::APP, "app-12"},
 137     {0x0059000000000ULL, 0x005E000000000ULL, MappingDesc::INVALID, "invalid"},
 138     {0x005E000000000ULL, 0x005F000000000ULL, MappingDesc::SHADOW, "shadow-12"},
 139     {0x005F000000000ULL, 0x0060000000000ULL, MappingDesc::ORIGIN, "origin-12"},
 140     {0x0060000000000ULL, 0x0061000000000ULL, MappingDesc::INVALID, "invalid"},
 141     {0x0061000000000ULL, 0x0062000000000ULL, MappingDesc::APP, "app-13"},
 142     {0x0062000000000ULL, 0x0067000000000ULL, MappingDesc::INVALID, "invalid"},
 143     {0x0067000000000ULL, 0x0068000000000ULL, MappingDesc::SHADOW, "shadow-13"},
 144     {0x0068000000000ULL, 0x0069000000000ULL, MappingDesc::ORIGIN, "origin-13"},
 145     {0x0069000000000ULL, 0x0AAAAA0000000ULL, MappingDesc::INVALID, "invalid"},
 146     {0x0AAAAA0000000ULL, 0x0AAAB00000000ULL, MappingDesc::APP, "app-14"},
 147     {0x0AAAB00000000ULL, 0x0AACAA0000000ULL, MappingDesc::INVALID, "invalid"},
 148     {0x0AACAA0000000ULL, 0x0AACB00000000ULL, MappingDesc::SHADOW, "shadow-14"},
 149     {0x0AACB00000000ULL, 0x0AADAA0000000ULL, MappingDesc::INVALID, "invalid"},
 150     {0x0AADAA0000000ULL, 0x0AADB00000000ULL, MappingDesc::ORIGIN, "origin-14"},
 151     {0x0AADB00000000ULL, 0x0FF9F00000000ULL, MappingDesc::INVALID, "invalid"},
 152     {0x0FF9F00000000ULL, 0x0FFA000000000ULL, MappingDesc::SHADOW, "shadow-15"},
 153     {0x0FFA000000000ULL, 0x0FFAF00000000ULL, MappingDesc::INVALID, "invalid"},
 154     {0x0FFAF00000000ULL, 0x0FFB000000000ULL, MappingDesc::ORIGIN, "origin-15"},
 155     {0x0FFB000000000ULL, 0x0FFFF00000000ULL, MappingDesc::INVALID, "invalid"},
 156     {0x0FFFF00000000ULL, 0x1000000000000ULL, MappingDesc::APP, "app-15"},
 157 };
 158 # define MEM_TO_SHADOW(mem) ((uptr)mem ^ 0x6000000000ULL)
 159 # define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x1000000000ULL)
 160
 161 #elif SANITIZER_LINUX && SANITIZER_PPC64
 162 const MappingDesc kMemoryLayout[] = {
 163     {0x000000000000ULL, 0x000200000000ULL, MappingDesc::APP, "low memory"},
 164     {0x000200000000ULL, 0x080000000000ULL, MappingDesc::INVALID, "invalid"},
 165     {0x080000000000ULL, 0x180200000000ULL, MappingDesc::SHADOW, "shadow"},
 166     {0x180200000000ULL, 0x1C0000000000ULL, MappingDesc::INVALID, "invalid"},
 167     {0x1C0000000000ULL, 0x2C0200000000ULL, MappingDesc::ORIGIN, "origin"},
 168     {0x2C0200000000ULL, 0x300000000000ULL, MappingDesc::INVALID, "invalid"},
 169     {0x300000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};
 170
 171 // Various kernels use different low end ranges but we can combine them into one
 172 // big range. They also use different high end ranges but we can map them all to
 173 // one range.
 174 // Maps low and high app ranges to contiguous space with zero base:
 175 //   Low:  0000 0000 0000 - 0001 ffff ffff  ->  1000 0000 0000 - 1001 ffff ffff
 176 //   High: 3000 0000 0000 - 3fff ffff ffff  ->  0000 0000 0000 - 0fff ffff ffff
 177 //   High: 4000 0000 0000 - 4fff ffff ffff  ->  0000 0000 0000 - 0fff ffff ffff
 178 //   High: 7000 0000 0000 - 7fff ffff ffff  ->  0000 0000 0000 - 0fff ffff ffff
 179 #define LINEARIZE_MEM(mem) \
 180   (((uptr)(mem) & ~0xE00000000000ULL) ^ 0x100000000000ULL)
 181 #define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x080000000000ULL)
 182 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x140000000000ULL)
 183
 184 #elif SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 64
 185
 186 // Low memory: main binary, MAP_32BIT mappings and modules
 187 // High memory: heap, modules and main thread stack
 188 const MappingDesc kMemoryLayout[] = {
 189     {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "low memory"},
 190     {0x010000000000ULL, 0x100000000000ULL, MappingDesc::INVALID, "invalid"},
 191     {0x100000000000ULL, 0x310000000000ULL, MappingDesc::SHADOW, "shadow"},
 192     {0x310000000000ULL, 0x380000000000ULL, MappingDesc::INVALID, "invalid"},
 193     {0x380000000000ULL, 0x590000000000ULL, MappingDesc::ORIGIN, "origin"},
 194     {0x590000000000ULL, 0x600000000000ULL, MappingDesc::INVALID, "invalid"},
 195     {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};
 196
 197 // Maps low and high app ranges to contiguous space with zero base:
 198 //   Low:  0000 0000 0000 - 00ff ffff ffff  ->  2000 0000 0000 - 20ff ffff ffff
 199 //   High: 6000 0000 0000 - 7fff ffff ffff  ->  0000 0000 0000 - 1fff ffff ffff
 200 #define LINEARIZE_MEM(mem) \
 201   (((uptr)(mem) & ~0xc00000000000ULL) ^ 0x200000000000ULL)
 202 #define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x100000000000ULL)
 203 #define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x280000000000)
 204
 205 #elif SANITIZER_NETBSD || (SANITIZER_LINUX && SANITIZER_WORDSIZE == 64)
 206
 207 #ifdef MSAN_LINUX_X86_64_OLD_MAPPING
 208 // Requries PIE binary and ASLR enabled.
 209 // Main thread stack and DSOs at 0x7f0000000000 (sometimes 0x7e0000000000).
 210 // Heap at 0x600000000000.
 211 const MappingDesc kMemoryLayout[] = {
 212     {0x000000000000ULL, 0x200000000000ULL, MappingDesc::INVALID, "invalid"},
 213     {0x200000000000ULL, 0x400000000000ULL, MappingDesc::SHADOW, "shadow"},
 214     {0x400000000000ULL, 0x600000000000ULL, MappingDesc::ORIGIN, "origin"},
 215     {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app"}};
 216
 217 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
 218 #define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x200000000000ULL)
 219 #else  // MSAN_LINUX_X86_64_OLD_MAPPING
 220 // All of the following configurations are supported.
 221 // ASLR disabled: main executable and DSOs at 0x555550000000
 222 // PIE and ASLR: main executable and DSOs at 0x7f0000000000
 223 // non-PIE: main executable below 0x100000000, DSOs at 0x7f0000000000
 224 // Heap at 0x700000000000.
 225 const MappingDesc kMemoryLayout[] = {
 226     {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app-1"},
 227     {0x010000000000ULL, 0x100000000000ULL, MappingDesc::SHADOW, "shadow-2"},
 228     {0x100000000000ULL, 0x110000000000ULL, MappingDesc::INVALID, "invalid"},
 229     {0x110000000000ULL, 0x200000000000ULL, MappingDesc::ORIGIN, "origin-2"},
 230     {0x200000000000ULL, 0x300000000000ULL, MappingDesc::SHADOW, "shadow-3"},
 231     {0x300000000000ULL, 0x400000000000ULL, MappingDesc::ORIGIN, "origin-3"},
 232     {0x400000000000ULL, 0x500000000000ULL, MappingDesc::INVALID, "invalid"},
 233     {0x500000000000ULL, 0x510000000000ULL, MappingDesc::SHADOW, "shadow-1"},
 234     {0x510000000000ULL, 0x600000000000ULL, MappingDesc::APP, "app-2"},
 235     {0x600000000000ULL, 0x610000000000ULL, MappingDesc::ORIGIN, "origin-1"},
 236     {0x610000000000ULL, 0x700000000000ULL, MappingDesc::INVALID, "invalid"},
 237     {0x700000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app-3"}};
 238 #define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x500000000000ULL)
 239 #define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x100000000000ULL)
 240 #endif  // MSAN_LINUX_X86_64_OLD_MAPPING
 241
 242 #else
 243 #error "Unsupported platform"
 244 #endif
 245
 246 const uptr kMemoryLayoutSize = sizeof(kMemoryLayout) / sizeof(kMemoryLayout[0]);
 247
 248 #define MEM_TO_ORIGIN(mem) (SHADOW_TO_ORIGIN(MEM_TO_SHADOW((mem))))
 249
 250 #ifndef __clang__
 251 __attribute__((optimize("unroll-loops")))
 252 #endif
 253 inline bool addr_is_type(uptr addr, MappingDesc::Type mapping_type) {
 254 // It is critical for performance that this loop is unrolled (because then it is
 255 // simplified into just a few constant comparisons).
 256 #ifdef __clang__
 257 #pragma unroll
 258 #endif
 259   for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
 260     if (kMemoryLayout[i].type == mapping_type &&
 261         addr >= kMemoryLayout[i].start && addr < kMemoryLayout[i].end)
 262       return true;
 263   return false;
 264 }
 265
 266 #define MEM_IS_APP(mem) addr_is_type((uptr)(mem), MappingDesc::APP)
 267 #define MEM_IS_SHADOW(mem) addr_is_type((uptr)(mem), MappingDesc::SHADOW)
 268 #define MEM_IS_ORIGIN(mem) addr_is_type((uptr)(mem), MappingDesc::ORIGIN)
 269
 270 // These constants must be kept in sync with the ones in MemorySanitizer.cc.
 271 const int kMsanParamTlsSize = 800;
 272 const int kMsanRetvalTlsSize = 800;
 273
 274 namespace __msan {
 275 extern int msan_inited;
 276 extern bool msan_init_is_running;
 277 extern int msan_report_count;
 278
 279 bool ProtectRange(uptr beg, uptr end);
 280 bool InitShadow(bool init_origins);
 281 char *GetProcSelfMaps();
 282 void InitializeInterceptors();
 283
 284 void MsanAllocatorInit();
 285 void MsanAllocatorThreadFinish();
 286 void MsanDeallocate(StackTrace *stack, void *ptr);
 287
 288 void *msan_malloc(uptr size, StackTrace *stack);
 289 void *msan_calloc(uptr nmemb, uptr size, StackTrace *stack);
 290 void *msan_realloc(void *ptr, uptr size, StackTrace *stack);
 291 void *msan_reallocarray(void *ptr, uptr nmemb, 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 // Unpoison first n function arguments.
 317 void UnpoisonParam(uptr n);
 318 void UnpoisonThreadLocalState();
 319
 320 // Returns a "chained" origin id, pointing to the given stack trace followed by
 321 // the previous origin id.
 322 u32 ChainOrigin(u32 id, StackTrace *stack);
 323
 324 const int STACK_TRACE_TAG_POISON = StackTrace::TAG_CUSTOM + 1;
 325
 326 #define GET_MALLOC_STACK_TRACE                                            \
 327   BufferedStackTrace stack;                                               \
 328   if (__msan_get_track_origins() && msan_inited)                          \
 329     stack.Unwind(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(),         \
 330                  nullptr, common_flags()->fast_unwind_on_malloc,          \
 331                  common_flags()->malloc_context_size)
 332
 333 // For platforms which support slow unwinder only, we restrict the store context
 334 // size to 1, basically only storing the current pc. We do this because the slow
 335 // unwinder which is based on libunwind is not async signal safe and causes
 336 // random freezes in forking applications as well as in signal handlers.
 337 #define GET_STORE_STACK_TRACE_PC_BP(pc, bp)                                    \
 338   BufferedStackTrace stack;                                                    \
 339   if (__msan_get_track_origins() > 1 && msan_inited) {                         \
 340     int size = flags()->store_context_size;                                    \
 341     if (!SANITIZER_CAN_FAST_UNWIND)                                            \
 342       size = Min(size, 1);                                                     \
 343     stack.Unwind(pc, bp, nullptr, common_flags()->fast_unwind_on_malloc, size);\
 344   }
 345
 346 #define GET_STORE_STACK_TRACE \
 347   GET_STORE_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())
 348
 349 #define GET_FATAL_STACK_TRACE_PC_BP(pc, bp)              \
 350   BufferedStackTrace stack;                              \
 351   if (msan_inited)                                       \
 352     stack.Unwind(pc, bp, nullptr, common_flags()->fast_unwind_on_fatal)
 353
 354 #define GET_FATAL_STACK_TRACE_HERE \
 355   GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME())
 356
 357 #define PRINT_CURRENT_STACK_CHECK() \
 358   {                                 \
 359     GET_FATAL_STACK_TRACE_HERE;     \
 360     stack.Print();                  \
 361   }
 362
 363 class ScopedThreadLocalStateBackup {
 364  public:
 365   ScopedThreadLocalStateBackup() { Backup(); }
 366   ~ScopedThreadLocalStateBackup() { Restore(); }
 367   void Backup();
 368   void Restore();
 369  private:
 370   u64 va_arg_overflow_size_tls;
 371 };
 372
 373 void MsanTSDInit(void (*destructor)(void *tsd));
 374 void *MsanTSDGet();
 375 void MsanTSDSet(void *tsd);
 376 void MsanTSDDtor(void *tsd);
 377
 378 }  // namespace __msan
 379
 380 #define MSAN_MALLOC_HOOK(ptr, size)       \
 381   do {                                    \
 382     if (&__sanitizer_malloc_hook) {       \
 383       UnpoisonParam(2);                   \
 384       __sanitizer_malloc_hook(ptr, size); \
 385     }                                     \
 386     RunMallocHooks(ptr, size);            \
 387   } while (false)
 388 #define MSAN_FREE_HOOK(ptr)       \
 389   do {                            \
 390     if (&__sanitizer_free_hook) { \
 391       UnpoisonParam(1);           \
 392       __sanitizer_free_hook(ptr); \
 393     }                             \
 394     RunFreeHooks(ptr);            \
 395   } while (false)
 396
 397 #endif  // MSAN_H