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📄 hwasan.cpp(15.25 KB)
📄 hwasan.h(5.69 KB)
📄 hwasan.syms.extra(21 B)
📄 hwasan_allocator.cpp(13.71 KB)
📄 hwasan_allocator.h(3.26 KB)
📄 hwasan_blacklist.txt(282 B)
📄 hwasan_checks.h(4.04 KB)
📄 hwasan_dynamic_shadow.cpp(5.17 KB)
📄 hwasan_dynamic_shadow.h(838 B)
📄 hwasan_exceptions.cpp(2.68 KB)
📄 hwasan_flags.h(799 B)
📄 hwasan_flags.inc(3.27 KB)
📄 hwasan_globals.cpp(3.03 KB)
📄 hwasan_globals.h(1.85 KB)
📄 hwasan_interceptors.cpp(11.1 KB)
📄 hwasan_interceptors_vfork.S(409 B)
📄 hwasan_interface_internal.h(6.32 KB)
📄 hwasan_linux.cpp(15.83 KB)
📄 hwasan_malloc_bisect.h(1.67 KB)
📄 hwasan_mapping.h(2.01 KB)
📄 hwasan_memintrinsics.cpp(1.6 KB)
📄 hwasan_new_delete.cpp(2.29 KB)
📄 hwasan_poisoning.cpp(1.89 KB)
📄 hwasan_poisoning.h(756 B)
📄 hwasan_report.cpp(24.11 KB)
📄 hwasan_report.h(1.2 KB)
📄 hwasan_setjmp.S(2.81 KB)
📄 hwasan_tag_mismatch_aarch64.S(5.89 KB)
📄 hwasan_thread.cpp(3.9 KB)
📄 hwasan_thread.h(2.82 KB)
📄 hwasan_thread_list.cpp(442 B)
📄 hwasan_thread_list.h(6.2 KB)
📄 hwasan_type_test.cpp(918 B)

Editing: hwasan_poisoning.cpp

//===-- hwasan_poisoning.cpp ------------------------------------*- 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 HWAddressSanitizer.
//
//===----------------------------------------------------------------------===//

#include "hwasan_poisoning.h"

#include "hwasan_mapping.h"
#include "interception/interception.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_linux.h"

namespace __hwasan {

uptr TagMemoryAligned(uptr p, uptr size, tag_t tag) {
  CHECK(IsAligned(p, kShadowAlignment));
  CHECK(IsAligned(size, kShadowAlignment));
  uptr shadow_start = MemToShadow(p);
  uptr shadow_size = MemToShadowSize(size);

uptr page_size = GetPageSizeCached();
  uptr page_start = RoundUpTo(shadow_start, page_size);
  uptr page_end = RoundDownTo(shadow_start + shadow_size, page_size);
  uptr threshold = common_flags()->clear_shadow_mmap_threshold;
  if (SANITIZER_LINUX &&
      UNLIKELY(page_end >= page_start + threshold && tag == 0)) {
    internal_memset((void *)shadow_start, tag, page_start - shadow_start);
    internal_memset((void *)page_end, tag,
                    shadow_start + shadow_size - page_end);
    // For an anonymous private mapping MADV_DONTNEED will return a zero page on
    // Linux.
    ReleaseMemoryPagesToOSAndZeroFill(page_start, page_end);
  } else {
    internal_memset((void *)shadow_start, tag, shadow_size);
  }
  return AddTagToPointer(p, tag);
}

uptr TagMemory(uptr p, uptr size, tag_t tag) {
  uptr start = RoundDownTo(p, kShadowAlignment);
  uptr end = RoundUpTo(p + size, kShadowAlignment);
  return TagMemoryAligned(start, end - start, tag);
}

}  // namespace __hwasan

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