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//===-- 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
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