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📄 README.txt(924 B)
📄 asan.syms.extra(39 B)
📄 asan_activation.cpp(4.55 KB)
📄 asan_activation.h(736 B)
📄 asan_activation_flags.inc(1.42 KB)
📄 asan_allocator.cpp(40.63 KB)
📄 asan_allocator.h(8.05 KB)
📄 asan_blacklist.txt(513 B)
📄 asan_debugging.cpp(4.7 KB)
📄 asan_descriptions.cpp(16.44 KB)
📄 asan_descriptions.h(7.59 KB)
📄 asan_errors.cpp(21.78 KB)
📄 asan_errors.h(14.75 KB)
📄 asan_fake_stack.cpp(10.82 KB)
📄 asan_fake_stack.h(6.89 KB)
📄 asan_flags.cpp(7.32 KB)
📄 asan_flags.h(1.45 KB)
📄 asan_flags.inc(7.92 KB)
📄 asan_fuchsia.cpp(8.18 KB)
📄 asan_globals.cpp(16.98 KB)
📄 asan_globals_win.cpp(2.03 KB)
📄 asan_init_version.h(1.88 KB)
📄 asan_interceptors.cpp(23.89 KB)
📄 asan_interceptors.h(4.86 KB)
📄 asan_interceptors_memintrinsics.cpp(1.52 KB)
📄 asan_interceptors_memintrinsics.h(8.12 KB)
📄 asan_interceptors_vfork.S(526 B)
📄 asan_interface.inc(7.25 KB)
📄 asan_interface_internal.h(10.88 KB)
📄 asan_internal.h(5.95 KB)
📄 asan_linux.cpp(7.45 KB)
📄 asan_lock.h(0 B)
📄 asan_mac.cpp(11.64 KB)
📄 asan_malloc_linux.cpp(9.8 KB)
📄 asan_malloc_local.h(1.92 KB)
📄 asan_malloc_mac.cpp(3.83 KB)
📄 asan_malloc_win.cpp(19.55 KB)
📄 asan_mapping.h(14.72 KB)
📄 asan_mapping_myriad.h(2.11 KB)
📄 asan_mapping_sparc64.h(2.95 KB)
📄 asan_memory_profile.cpp(4.12 KB)
📄 asan_new_delete.cpp(8.16 KB)
📄 asan_poisoning.cpp(16 KB)
📄 asan_poisoning.h(3.85 KB)
📄 asan_posix.cpp(4.12 KB)
📄 asan_preinit.cpp(1 KB)
📄 asan_premap_shadow.cpp(2.7 KB)
📄 asan_premap_shadow.h(913 B)
📄 asan_report.cpp(20.2 KB)
📄 asan_report.h(4.59 KB)
📄 asan_rtems.cpp(8.9 KB)
📄 asan_rtl.cpp(22.99 KB)
📄 asan_scariness_score.h(2.25 KB)
📄 asan_shadow_setup.cpp(6.2 KB)
📄 asan_stack.cpp(2.28 KB)
📄 asan_stack.h(3.29 KB)
📄 asan_stats.cpp(5.62 KB)
📄 asan_stats.h(2.05 KB)
📄 asan_suppressions.cpp(3.62 KB)
📄 asan_suppressions.h(1.01 KB)
📄 asan_thread.cpp(18.01 KB)
📄 asan_thread.h(5.56 KB)
📄 asan_win.cpp(13.74 KB)
📄 asan_win_dll_thunk.cpp(5.12 KB)
📄 asan_win_dynamic_runtime_thunk.cpp(5.4 KB)
📄 asan_win_weak_interception.cpp(1.14 KB)
📄 weak_symbols.txt(268 B)

Editing: asan_poisoning.h

//===-- asan_poisoning.h ----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Shadow memory poisoning by ASan RTL and by user application.
//===----------------------------------------------------------------------===//

#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_mapping.h"
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_platform.h"

namespace __asan {

// Enable/disable memory poisoning.
void SetCanPoisonMemory(bool value);
bool CanPoisonMemory();

// Poisons the shadow memory for "size" bytes starting from "addr".
void PoisonShadow(uptr addr, uptr size, u8 value);

// Poisons the shadow memory for "redzone_size" bytes starting from
// "addr + size".
void PoisonShadowPartialRightRedzone(uptr addr,
                                     uptr size,
                                     uptr redzone_size,
                                     u8 value);

// Fast versions of PoisonShadow and PoisonShadowPartialRightRedzone that
// assume that memory addresses are properly aligned. Use in
// performance-critical code with care.
ALWAYS_INLINE void FastPoisonShadow(uptr aligned_beg, uptr aligned_size,
                                    u8 value) {
  DCHECK(!value || CanPoisonMemory());
#if SANITIZER_FUCHSIA
  __sanitizer_fill_shadow(aligned_beg, aligned_size, value,
                          common_flags()->clear_shadow_mmap_threshold);
#else
  uptr shadow_beg = MEM_TO_SHADOW(aligned_beg);
  uptr shadow_end = MEM_TO_SHADOW(
      aligned_beg + aligned_size - SHADOW_GRANULARITY) + 1;
  // FIXME: Page states are different on Windows, so using the same interface
  // for mapping shadow and zeroing out pages doesn't "just work", so we should
  // probably provide higher-level interface for these operations.
  // For now, just memset on Windows.
  if (value || SANITIZER_WINDOWS == 1 ||
      // RTEMS doesn't have have pages, let alone a fast way to zero
      // them, so default to memset.
      SANITIZER_RTEMS == 1 ||
      shadow_end - shadow_beg < common_flags()->clear_shadow_mmap_threshold) {
    REAL(memset)((void*)shadow_beg, value, shadow_end - shadow_beg);
  } else {
    uptr page_size = GetPageSizeCached();
    uptr page_beg = RoundUpTo(shadow_beg, page_size);
    uptr page_end = RoundDownTo(shadow_end, page_size);

if (page_beg >= page_end) {
      REAL(memset)((void *)shadow_beg, 0, shadow_end - shadow_beg);
    } else {
      if (page_beg != shadow_beg) {
        REAL(memset)((void *)shadow_beg, 0, page_beg - shadow_beg);
      }
      if (page_end != shadow_end) {
        REAL(memset)((void *)page_end, 0, shadow_end - page_end);
      }
      ReserveShadowMemoryRange(page_beg, page_end - 1, nullptr);
    }
  }
#endif // SANITIZER_FUCHSIA
}

ALWAYS_INLINE void FastPoisonShadowPartialRightRedzone(
    uptr aligned_addr, uptr size, uptr redzone_size, u8 value) {
  DCHECK(CanPoisonMemory());
  bool poison_partial = flags()->poison_partial;
  u8 *shadow = (u8*)MEM_TO_SHADOW(aligned_addr);
  for (uptr i = 0; i < redzone_size; i += SHADOW_GRANULARITY, shadow++) {
    if (i + SHADOW_GRANULARITY <= size) {
      *shadow = 0;  // fully addressable
    } else if (i >= size) {
      *shadow = (SHADOW_GRANULARITY == 128) ? 0xff : value;  // unaddressable
    } else {
      // first size-i bytes are addressable
      *shadow = poison_partial ? static_cast<u8>(size - i) : 0;
    }
  }
}

// Calls __sanitizer::ReleaseMemoryPagesToOS() on
// [MemToShadow(p), MemToShadow(p+size)].
void FlushUnneededASanShadowMemory(uptr p, uptr size);

}  // namespace __asan

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Editing: asan_poisoning.h

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