[llvm] r279413 - [asan] Use 1 byte aligned stores to poison shadow memory

[Vitaly Buka via llvm-commits]

Author: vitalybuka
Date: Sun Aug 21 23:16:14 2016
New Revision: 279413

URL: http://llvm.org/viewvc/llvm-project?rev=279413&view=rev
Log:
[asan] Use 1 byte aligned stores to poison shadow memory

Summary: r279379 introduced crash on arm 32bit bot. I suspect this is alignment issue.

Reviewers: eugenis

Subscribers: llvm-commits, aemerson

Differential Revision: https://reviews.llvm.org/D23762

Modified:
    llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp

Modified: llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp?rev=279413&r1=279412&r2=279413&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp Sun Aug 21 23:16:14 2016
@@ -2011,8 +2011,8 @@ void FunctionStackPoisoner::poisonStackF
 
     Value *Ptr = IRB.CreateAdd(ShadowBase, ConstantInt::get(IntptrTy, i));
     Value *Poison = IRB.getIntN(StoreSizeInBytes * 8, Val);
-    IRB.CreateStore(Poison,
-                    IRB.CreateIntToPtr(Ptr, Poison->getType()->getPointerTo()));
+    IRB.CreateAlignedStore(
+        Poison, IRB.CreateIntToPtr(Ptr, Poison->getType()->getPointerTo()), 1);
 
     i += StoreSizeInBytes;
   }