diff options
Diffstat (limited to 'contrib/compiler-rt/lib/asan/asan_fake_stack.cc')
| -rw-r--r-- | contrib/compiler-rt/lib/asan/asan_fake_stack.cc | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/asan/asan_fake_stack.cc b/contrib/compiler-rt/lib/asan/asan_fake_stack.cc index bf4f1eb..d206411 100644 --- a/contrib/compiler-rt/lib/asan/asan_fake_stack.cc +++ b/contrib/compiler-rt/lib/asan/asan_fake_stack.cc @@ -22,6 +22,9 @@ static const u64 kMagic2 = (kMagic1 << 8) | kMagic1; static const u64 kMagic4 = (kMagic2 << 16) | kMagic2; static const u64 kMagic8 = (kMagic4 << 32) | kMagic4; +static const u64 kAllocaRedzoneSize = 32UL; +static const u64 kAllocaRedzoneMask = 31UL; + // For small size classes inline PoisonShadow for better performance. ALWAYS_INLINE void SetShadow(uptr ptr, uptr size, uptr class_id, u64 magic) { CHECK_EQ(SHADOW_SCALE, 3); // This code expects SHADOW_SCALE=3. @@ -253,4 +256,24 @@ void *__asan_addr_is_in_fake_stack(void *fake_stack, void *addr, void **beg, if (end) *end = reinterpret_cast<void*>(frame_end); return reinterpret_cast<void*>(frame->real_stack); } + +SANITIZER_INTERFACE_ATTRIBUTE +void __asan_alloca_poison(uptr addr, uptr size) { + uptr LeftRedzoneAddr = addr - kAllocaRedzoneSize; + uptr PartialRzAddr = addr + size; + uptr RightRzAddr = (PartialRzAddr + kAllocaRedzoneMask) & ~kAllocaRedzoneMask; + uptr PartialRzAligned = PartialRzAddr & ~(SHADOW_GRANULARITY - 1); + FastPoisonShadow(LeftRedzoneAddr, kAllocaRedzoneSize, kAsanAllocaLeftMagic); + FastPoisonShadowPartialRightRedzone( + PartialRzAligned, PartialRzAddr % SHADOW_GRANULARITY, + RightRzAddr - PartialRzAligned, kAsanAllocaRightMagic); + FastPoisonShadow(RightRzAddr, kAllocaRedzoneSize, kAsanAllocaRightMagic); +} + +SANITIZER_INTERFACE_ATTRIBUTE +void __asan_allocas_unpoison(uptr top, uptr bottom) { + if ((!top) || (top > bottom)) return; + REAL(memset)(reinterpret_cast<void*>(MemToShadow(top)), 0, + (bottom - top) / SHADOW_GRANULARITY); +} } // extern "C" |
