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[asan] unpoison the stack before every noreturn call. Fixes asan issue 37. llvm part

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150102 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2012-02-08 21:36:17 +00:00
parent 1dd8c8560d
commit 95e3cf44a9
2 changed files with 34 additions and 2 deletions
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19
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@@ -60,6 +60,7 @@ static const char *kAsanReportErrorTemplate = "__asan_report_";
static const char *kAsanRegisterGlobalsName = "__asan_register_globals";
static const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals";
static const char *kAsanInitName = "__asan_init";
static const char *kAsanHandleNoReturnName = "__asan_handle_no_return";
static const char *kAsanMappingOffsetName = "__asan_mapping_offset";
static const char *kAsanMappingScaleName = "__asan_mapping_scale";
static const char *kAsanStackMallocName = "__asan_stack_malloc";
@@ -649,6 +650,7 @@ bool AddressSanitizer::handleFunction(Module &M, Function &F) {
// (unless there are calls between uses).
SmallSet<Value*, 16> TempsToInstrument;
SmallVector<Instruction*, 16> ToInstrument;
SmallVector<Instruction*, 8> NoReturnCalls;
// Fill the set of memory operations to instrument.
for (Function::iterator FI = F.begin(), FE = F.end();
@@ -667,9 +669,12 @@ bool AddressSanitizer::handleFunction(Module &M, Function &F) {
} else if (isa<MemIntrinsic>(BI) && ClMemIntrin) {
// ok, take it.
} else {
if (isa<CallInst>(BI)) {
if (CallInst *CI = dyn_cast<CallInst>(BI)) {
// A call inside BB.
TempsToInstrument.clear();
if (CI->doesNotReturn()) {
NoReturnCalls.push_back(CI);
}
}
continue;
}
@@ -694,7 +699,17 @@ bool AddressSanitizer::handleFunction(Module &M, Function &F) {
DEBUG(dbgs() << F);
bool ChangedStack = poisonStackInFunction(M, F);
return NumInstrumented > 0 || ChangedStack;
// We must unpoison the stack before every NoReturn call (throw, _exit, etc).
// See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37
for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) {
Instruction *CI = NoReturnCalls[i];
IRBuilder<> IRB(CI);
IRB.CreateCall(M.getOrInsertFunction(kAsanHandleNoReturnName,
IRB.getVoidTy(), NULL));
}
return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty();
}
static uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) {