diff options
Diffstat (limited to 'lib/asan/asan_activation.cc')
-rw-r--r-- | lib/asan/asan_activation.cc | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/lib/asan/asan_activation.cc b/lib/asan/asan_activation.cc new file mode 100644 index 000000000000..eb4a6db0b85e --- /dev/null +++ b/lib/asan/asan_activation.cc @@ -0,0 +1,88 @@ +//===-- asan_activation.cc --------------------------------------*- 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 AddressSanitizer, an address sanity checker. +// +// ASan activation/deactivation logic. +//===----------------------------------------------------------------------===// + +#include "asan_activation.h" +#include "asan_allocator.h" +#include "asan_flags.h" +#include "asan_internal.h" +#include "sanitizer_common/sanitizer_flags.h" + +namespace __asan { + +static struct AsanDeactivatedFlags { + int quarantine_size; + int max_redzone; + int malloc_context_size; + bool poison_heap; + bool alloc_dealloc_mismatch; + bool allocator_may_return_null; +} asan_deactivated_flags; + +static bool asan_is_deactivated; + +void AsanStartDeactivated() { + VReport(1, "Deactivating ASan\n"); + // Save flag values. + asan_deactivated_flags.quarantine_size = flags()->quarantine_size; + asan_deactivated_flags.max_redzone = flags()->max_redzone; + asan_deactivated_flags.poison_heap = flags()->poison_heap; + asan_deactivated_flags.malloc_context_size = + common_flags()->malloc_context_size; + asan_deactivated_flags.alloc_dealloc_mismatch = + flags()->alloc_dealloc_mismatch; + asan_deactivated_flags.allocator_may_return_null = + common_flags()->allocator_may_return_null; + + flags()->quarantine_size = 0; + flags()->max_redzone = 16; + flags()->poison_heap = false; + common_flags()->malloc_context_size = 0; + flags()->alloc_dealloc_mismatch = false; + common_flags()->allocator_may_return_null = true; + + asan_is_deactivated = true; +} + +void AsanActivate() { + if (!asan_is_deactivated) return; + VReport(1, "Activating ASan\n"); + + // Restore flag values. + // FIXME: this is not atomic, and there may be other threads alive. + flags()->quarantine_size = asan_deactivated_flags.quarantine_size; + flags()->max_redzone = asan_deactivated_flags.max_redzone; + flags()->poison_heap = asan_deactivated_flags.poison_heap; + common_flags()->malloc_context_size = + asan_deactivated_flags.malloc_context_size; + flags()->alloc_dealloc_mismatch = + asan_deactivated_flags.alloc_dealloc_mismatch; + common_flags()->allocator_may_return_null = + asan_deactivated_flags.allocator_may_return_null; + + ParseExtraActivationFlags(); + + ReInitializeAllocator(); + + asan_is_deactivated = false; + VReport( + 1, + "quarantine_size %d, max_redzone %d, poison_heap %d, " + "malloc_context_size %d, alloc_dealloc_mismatch %d, " + "allocator_may_return_null %d\n", + flags()->quarantine_size, flags()->max_redzone, flags()->poison_heap, + common_flags()->malloc_context_size, flags()->alloc_dealloc_mismatch, + common_flags()->allocator_may_return_null); +} + +} // namespace __asan |