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author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2017-12-09 01:31:51 +0000 |
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committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2017-12-09 01:31:51 +0000 |
commit | 32e20e4417a0dd8870d8ec5c9be21f5c2d1ebc63 (patch) | |
tree | 1a5c7d5b32c2072600e208cb10157e60e22e59c9 /lib/hwasan/hwasan_poisoning.cc | |
parent | ba5a005732212e5f111094e9aec667da37417624 (diff) |
Hardware-assisted AddressSanitizer (compiler-rt)
Summary:
Runtime library for HWASan, initial commit.
Does not randomize tags yet, does not handle stack or globals.
Reviewers: kcc, pcc, alekseyshl
Subscribers: srhines, kubamracek, dberris, mgorny, llvm-commits, krytarowski
Differential Revision: https://reviews.llvm.org/D40935
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@320231 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/hwasan/hwasan_poisoning.cc')
-rw-r--r-- | lib/hwasan/hwasan_poisoning.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/hwasan/hwasan_poisoning.cc b/lib/hwasan/hwasan_poisoning.cc new file mode 100644 index 000000000..411fd05b1 --- /dev/null +++ b/lib/hwasan/hwasan_poisoning.cc @@ -0,0 +1,36 @@ +//===-- hwasan_poisoning.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 HWAddressSanitizer. +// +//===----------------------------------------------------------------------===// + +#include "hwasan_poisoning.h" + +#include "interception/interception.h" +#include "sanitizer_common/sanitizer_common.h" + +namespace __hwasan { + +uptr TagMemoryAligned(uptr p, uptr size, tag_t tag) { + CHECK(IsAligned(p, kShadowAlignment)); + CHECK(IsAligned(size, kShadowAlignment)); + uptr shadow_start = MEM_TO_SHADOW(p); + uptr shadow_size = MEM_TO_SHADOW_OFFSET(size); + 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 |