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[asan] call __asan_stack_malloc_N only if use-after-return detection is enabled with the run-time option

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2013-09-18 14:07:14 +00:00
parent fa7b1e24e5
commit ac04abaf5a
1 changed files with 22 additions and 1 deletions
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23
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -88,6 +88,9 @@ static const char *const kAsanPoisonStackMemoryName =
static const char *const kAsanUnpoisonStackMemoryName =
"__asan_unpoison_stack_memory";
static const char *const kAsanOptionDetectUAR =
"__asan_option_detect_stack_use_after_return";
// These constants must match the definitions in the run-time library.
static const int kAsanStackLeftRedzoneMagic = 0xf1;
static const int kAsanStackMidRedzoneMagic = 0xf2;
@ -1409,10 +1412,28 @@ void FunctionStackPoisoner::poisonStack() {
Value *LocalStackBase = OrigStackBase;
if (DoStackMalloc) {
// LocalStackBase = OrigStackBase
// if (__asan_option_detect_stack_use_after_return)
// LocalStackBase = __asan_stack_malloc_N(LocalStackBase, OrigStackBase);
StackMallocIdx = StackMallocSizeClass(LocalStackSize);
assert(StackMallocIdx <= kMaxAsanStackMallocSizeClass);
LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc[StackMallocIdx],
Constant *OptionDetectUAR = F.getParent()->getOrInsertGlobal(
kAsanOptionDetectUAR, IRB.getInt32Ty());
Value *Cmp = IRB.CreateICmpNE(IRB.CreateLoad(OptionDetectUAR),
Constant::getNullValue(IRB.getInt32Ty()));
Instruction *Term =
SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false);
BasicBlock *CmpBlock = cast<Instruction>(Cmp)->getParent();
IRBuilder<> IRBIf(Term);
LocalStackBase = IRBIf.CreateCall2(
AsanStackMallocFunc[StackMallocIdx],
ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase);
BasicBlock *SetBlock = cast<Instruction>(LocalStackBase)->getParent();
IRB.SetInsertPoint(InsBefore);
PHINode *Phi = IRB.CreatePHI(IntptrTy, 2);
Phi->addIncoming(OrigStackBase, CmpBlock);
Phi->addIncoming(LocalStackBase, SetBlock);
LocalStackBase = Phi;
}
// This string will be parsed by the run-time (DescribeAddressIfStack).