libsanitizer/tsan/tsan_platform_posix.cc

   1 //===-- tsan_platform_posix.cc --------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 // POSIX-specific code.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_common/sanitizer_platform.h"
  14 #if SANITIZER_POSIX
  15
  16 #include "sanitizer_common/sanitizer_common.h"
  17 #include "sanitizer_common/sanitizer_libc.h"
  18 #include "sanitizer_common/sanitizer_procmaps.h"
  19 #include "tsan_platform.h"
  20 #include "tsan_rtl.h"
  21
  22 namespace __tsan {
  23
  24 #if !SANITIZER_GO
  25 void InitializeShadowMemory() {
  26   // Map memory shadow.
  27   uptr shadow =
  28       (uptr)MmapFixedNoReserve(ShadowBeg(), ShadowEnd() - ShadowBeg(),
  29                                "shadow");
  30   if (shadow != ShadowBeg()) {
  31     Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
  32     Printf("FATAL: Make sure to compile with -fPIE and "
  33                "to link with -pie (%p, %p).\n", shadow, ShadowBeg());
  34     Die();
  35   }
  36   // This memory range is used for thread stacks and large user mmaps.
  37   // Frequently a thread uses only a small part of stack and similarly
  38   // a program uses a small part of large mmap. On some programs
  39   // we see 20% memory usage reduction without huge pages for this range.
  40   // FIXME: don't use constants here.
  41 #if defined(__x86_64__)
  42   const uptr kMadviseRangeBeg  = 0x7f0000000000ull;
  43   const uptr kMadviseRangeSize = 0x010000000000ull;
  44 #elif defined(__mips64)
  45   const uptr kMadviseRangeBeg  = 0xff00000000ull;
  46   const uptr kMadviseRangeSize = 0x0100000000ull;
  47 #elif defined(__aarch64__)
  48   uptr kMadviseRangeBeg = 0;
  49   uptr kMadviseRangeSize = 0;
  50   if (vmaSize == 39) {
  51     kMadviseRangeBeg  = 0x7d00000000ull;
  52     kMadviseRangeSize = 0x0300000000ull;
  53   } else if (vmaSize == 42) {
  54     kMadviseRangeBeg  = 0x3f000000000ull;
  55     kMadviseRangeSize = 0x01000000000ull;
  56   } else {
  57     DCHECK(0);
  58   }
  59 #elif defined(__powerpc64__)
  60   uptr kMadviseRangeBeg = 0;
  61   uptr kMadviseRangeSize = 0;
  62   if (vmaSize == 44) {
  63     kMadviseRangeBeg  = 0x0f60000000ull;
  64     kMadviseRangeSize = 0x0010000000ull;
  65   } else if (vmaSize == 46) {
  66     kMadviseRangeBeg  = 0x3f0000000000ull;
  67     kMadviseRangeSize = 0x010000000000ull;
  68   } else {
  69     DCHECK(0);
  70   }
  71 #endif
  72   NoHugePagesInRegion(MemToShadow(kMadviseRangeBeg),
  73                       kMadviseRangeSize * kShadowMultiplier);
  74   // Meta shadow is compressing and we don't flush it,
  75   // so it makes sense to mark it as NOHUGEPAGE to not over-allocate memory.
  76   // On one program it reduces memory consumption from 5GB to 2.5GB.
  77   NoHugePagesInRegion(MetaShadowBeg(), MetaShadowEnd() - MetaShadowBeg());
  78   if (common_flags()->use_madv_dontdump)
  79     DontDumpShadowMemory(ShadowBeg(), ShadowEnd() - ShadowBeg());
  80   DPrintf("memory shadow: %zx-%zx (%zuGB)\n",
  81       ShadowBeg(), ShadowEnd(),
  82       (ShadowEnd() - ShadowBeg()) >> 30);
  83
  84   // Map meta shadow.
  85   uptr meta_size = MetaShadowEnd() - MetaShadowBeg();
  86   uptr meta =
  87       (uptr)MmapFixedNoReserve(MetaShadowBeg(), meta_size, "meta shadow");
  88   if (meta != MetaShadowBeg()) {
  89     Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
  90     Printf("FATAL: Make sure to compile with -fPIE and "
  91                "to link with -pie (%p, %p).\n", meta, MetaShadowBeg());
  92     Die();
  93   }
  94   if (common_flags()->use_madv_dontdump)
  95     DontDumpShadowMemory(meta, meta_size);
  96   DPrintf("meta shadow: %zx-%zx (%zuGB)\n",
  97       meta, meta + meta_size, meta_size >> 30);
  98
  99   InitializeShadowMemoryPlatform();
 100 }
 101
 102 static void ProtectRange(uptr beg, uptr end) {
 103   CHECK_LE(beg, end);
 104   if (beg == end)
 105     return;
 106   if (beg != (uptr)MmapFixedNoAccess(beg, end - beg)) {
 107     Printf("FATAL: ThreadSanitizer can not protect [%zx,%zx]\n", beg, end);
 108     Printf("FATAL: Make sure you are not using unlimited stack\n");
 109     Die();
 110   }
 111 }
 112
 113 void CheckAndProtect() {
 114   // Ensure that the binary is indeed compiled with -pie.
 115   MemoryMappingLayout proc_maps(true);
 116   uptr p, end, prot;
 117   while (proc_maps.Next(&p, &end, 0, 0, 0, &prot)) {
 118     if (IsAppMem(p))
 119       continue;
 120     if (p >= HeapMemEnd() &&
 121         p < HeapEnd())
 122       continue;
 123     if (prot == 0)  // Zero page or mprotected.
 124       continue;
 125     if (p >= VdsoBeg())  // vdso
 126       break;
 127     Printf("FATAL: ThreadSanitizer: unexpected memory mapping %p-%p\n", p, end);
 128     Die();
 129   }
 130
 131   ProtectRange(LoAppMemEnd(), ShadowBeg());
 132   ProtectRange(ShadowEnd(), MetaShadowBeg());
 133 #ifdef TSAN_MID_APP_RANGE
 134   ProtectRange(MetaShadowEnd(), MidAppMemBeg());
 135   ProtectRange(MidAppMemEnd(), TraceMemBeg());
 136 #else
 137   ProtectRange(MetaShadowEnd(), TraceMemBeg());
 138 #endif
 139   // Memory for traces is mapped lazily in MapThreadTrace.
 140   // Protect the whole range for now, so that user does not map something here.
 141   ProtectRange(TraceMemBeg(), TraceMemEnd());
 142   ProtectRange(TraceMemEnd(), HeapMemBeg());
 143   ProtectRange(HeapEnd(), HiAppMemBeg());
 144 }
 145 #endif
 146
 147 }  // namespace __tsan
 148
 149 #endif  // SANITIZER_POSIX