libsanitizer/asan/asan_activation.cc

   1 //===-- asan_activation.cc --------------------------------------*- C++ -*-===//
   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 AddressSanitizer, an address sanity checker.
   9 //
  10 // ASan activation/deactivation logic.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "asan_activation.h"
  14 #include "asan_allocator.h"
  15 #include "asan_flags.h"
  16 #include "asan_internal.h"
  17 #include "sanitizer_common/sanitizer_flags.h"
  18
  19 namespace __asan {
  20
  21 static struct AsanDeactivatedFlags {
  22   int quarantine_size;
  23   int max_redzone;
  24   int malloc_context_size;
  25   bool poison_heap;
  26 } asan_deactivated_flags;
  27
  28 static bool asan_is_deactivated;
  29
  30 void AsanStartDeactivated() {
  31   VReport(1, "Deactivating ASan\n");
  32   // Save flag values.
  33   asan_deactivated_flags.quarantine_size = flags()->quarantine_size;
  34   asan_deactivated_flags.max_redzone = flags()->max_redzone;
  35   asan_deactivated_flags.poison_heap = flags()->poison_heap;
  36   asan_deactivated_flags.malloc_context_size =
  37       common_flags()->malloc_context_size;
  38
  39   flags()->quarantine_size = 0;
  40   flags()->max_redzone = 16;
  41   flags()->poison_heap = false;
  42   common_flags()->malloc_context_size = 0;
  43
  44   asan_is_deactivated = true;
  45 }
  46
  47 void AsanActivate() {
  48   if (!asan_is_deactivated) return;
  49   VReport(1, "Activating ASan\n");
  50
  51   // Restore flag values.
  52   // FIXME: this is not atomic, and there may be other threads alive.
  53   flags()->quarantine_size = asan_deactivated_flags.quarantine_size;
  54   flags()->max_redzone = asan_deactivated_flags.max_redzone;
  55   flags()->poison_heap = asan_deactivated_flags.poison_heap;
  56   common_flags()->malloc_context_size =
  57       asan_deactivated_flags.malloc_context_size;
  58
  59   ParseExtraActivationFlags();
  60
  61   ReInitializeAllocator();
  62
  63   asan_is_deactivated = false;
  64   VReport(
  65       1,
  66       "quarantine_size %d, max_redzone %d, poison_heap %d, malloc_context_size "
  67       "%d\n",
  68       flags()->quarantine_size, flags()->max_redzone, flags()->poison_heap,
  69       common_flags()->malloc_context_size);
  70 }
  71
  72 }  // namespace __asan