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Revert "[hwasan] Use stack safety analysis."

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This reverts commit bde9415fef25e9ff6e10595a2f4f5004dd62f10a.
This commit is contained in:
Florian Mayer 2021-07-22 12:15:54 +01:00
parent 60d27bc367
commit 152a339cb1
3 changed files with 13 additions and 109 deletions
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10
include/llvm/Transforms/Instrumentation/HWAddressSanitizer.h
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@ -25,21 +25,17 @@ namespace llvm {
class HWAddressSanitizerPass : public PassInfoMixin<HWAddressSanitizerPass> {
public:
explicit HWAddressSanitizerPass(bool CompileKernel = false,
bool Recover = false,
bool DisableOptimization = false);
bool Recover = false);
PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM);
static bool isRequired() { return true; }
private:
bool CompileKernel;
bool Recover;
bool DisableOptimization;
};
FunctionPass *
createHWAddressSanitizerLegacyPassPass(bool CompileKernel = false,
bool Recover = false,
bool DisableOptimization = false);
FunctionPass *createHWAddressSanitizerLegacyPassPass(bool CompileKernel = false,
bool Recover = false);
namespace HWASanAccessInfo {

70
lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
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@ -17,7 +17,6 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/StackSafetyAnalysis.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/BasicBlock.h"
@ -110,11 +109,6 @@ static cl::opt<bool> ClInstrumentStack("hwasan-instrument-stack",
cl::desc("instrument stack (allocas)"),
cl::Hidden, cl::init(true));
static cl::opt<bool>
ClUseStackSafety("hwasan-use-stack-safety", cl::Hidden, cl::init(true),
cl::Hidden, cl::desc("Use Stack Safety analysis results"),
cl::Optional);
static cl::opt<bool> ClUARRetagToZero(
"hwasan-uar-retag-to-zero",
cl::desc("Clear alloca tags before returning from the function to allow "
@ -210,23 +204,11 @@ bool shouldInstrumentWithCalls(const Triple &TargetTriple) {
return ClInstrumentWithCalls || TargetTriple.getArch() == Triple::x86_64;
}
bool mightUseStackSafetyAnalysis(bool DisableOptimization) {
return ClUseStackSafety.getNumOccurrences() ? ClUseStackSafety
: !DisableOptimization;
}
bool shouldUseStackSafetyAnalysis(const Triple &TargetTriple,
bool DisableOptimization) {
return shouldInstrumentStack(TargetTriple) &&
mightUseStackSafetyAnalysis(DisableOptimization);
}
/// An instrumentation pass implementing detection of addressability bugs
/// using tagged pointers.
class HWAddressSanitizer {
public:
HWAddressSanitizer(Module &M, bool CompileKernel, bool Recover,
const StackSafetyGlobalInfo *SSI)
: M(M), SSI(SSI) {
HWAddressSanitizer(Module &M, bool CompileKernel, bool Recover) : M(M) {
this->Recover = ClRecover.getNumOccurrences() > 0 ? ClRecover : Recover;
this->CompileKernel = ClEnableKhwasan.getNumOccurrences() > 0
? ClEnableKhwasan
@ -235,8 +217,6 @@ public:
initializeModule();
}
void setSSI(const StackSafetyGlobalInfo *S) { SSI = S; }
bool sanitizeFunction(Function &F);
void initializeModule();
void createHwasanCtorComdat();
@ -289,7 +269,6 @@ public:
private:
LLVMContext *C;
Module &M;
const StackSafetyGlobalInfo *SSI;
Triple TargetTriple;
FunctionCallee HWAsanMemmove, HWAsanMemcpy, HWAsanMemset;
FunctionCallee HWAsanHandleVfork;
@ -360,8 +339,7 @@ public:
static char ID;
explicit HWAddressSanitizerLegacyPass(bool CompileKernel = false,
bool Recover = false,
bool DisableOptimization = false)
bool Recover = false)
: FunctionPass(ID), CompileKernel(CompileKernel), Recover(Recover) {
initializeHWAddressSanitizerLegacyPassPass(
*PassRegistry::getPassRegistry());
@ -370,19 +348,11 @@ public:
StringRef getPassName() const override { return "HWAddressSanitizer"; }
bool doInitialization(Module &M) override {
HWASan = std::make_unique<HWAddressSanitizer>(M, CompileKernel, Recover,
/*SSI=*/nullptr);
HWASan = std::make_unique<HWAddressSanitizer>(M, CompileKernel, Recover);
return true;
}
bool runOnFunction(Function &F) override {
if (shouldUseStackSafetyAnalysis(Triple(F.getParent()->getTargetTriple()),
DisableOptimization)) {
// We cannot call getAnalysis in doInitialization, that would cause a
// crash as the required analyses are not initialized yet.
HWASan->setSSI(
&getAnalysis<StackSafetyGlobalInfoWrapperPass>().getResult());
}
return HWASan->sanitizeFunction(F);
}
@ -391,20 +361,10 @@ public:
return false;
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
// This is an over-estimation of, in case we are building for an
// architecture that doesn't allow stack tagging we will still load the
// analysis.
// This is so we don't need to plumb TargetTriple all the way to here.
if (mightUseStackSafetyAnalysis(DisableOptimization))
AU.addRequired<StackSafetyGlobalInfoWrapperPass>();
}
private:
std::unique_ptr<HWAddressSanitizer> HWASan;
bool CompileKernel;
bool Recover;
bool DisableOptimization;
};
} // end anonymous namespace
@ -420,26 +380,18 @@ INITIALIZE_PASS_END(
"HWAddressSanitizer: detect memory bugs using tagged addressing.", false,
false)
FunctionPass *
llvm::createHWAddressSanitizerLegacyPassPass(bool CompileKernel, bool Recover,
bool DisableOptimization) {
FunctionPass *llvm::createHWAddressSanitizerLegacyPassPass(bool CompileKernel,
bool Recover) {
assert(!CompileKernel || Recover);
return new HWAddressSanitizerLegacyPass(CompileKernel, Recover,
DisableOptimization);
return new HWAddressSanitizerLegacyPass(CompileKernel, Recover);
}
HWAddressSanitizerPass::HWAddressSanitizerPass(bool CompileKernel, bool Recover,
bool DisableOptimization)
: CompileKernel(CompileKernel), Recover(Recover),
DisableOptimization(DisableOptimization) {}
HWAddressSanitizerPass::HWAddressSanitizerPass(bool CompileKernel, bool Recover)
: CompileKernel(CompileKernel), Recover(Recover) {}
PreservedAnalyses HWAddressSanitizerPass::run(Module &M,
ModuleAnalysisManager &MAM) {
const StackSafetyGlobalInfo *SSI = nullptr;
if (shouldUseStackSafetyAnalysis(llvm::Triple(M.getTargetTriple()),
DisableOptimization))
SSI = &MAM.getResult<StackSafetyGlobalAnalysis>(M);
HWAddressSanitizer HWASan(M, CompileKernel, Recover, SSI);
HWAddressSanitizer HWASan(M, CompileKernel, Recover);
bool Modified = false;
for (Function &F : M)
Modified |= HWASan.sanitizeFunction(F);
@ -1293,9 +1245,7 @@ bool HWAddressSanitizer::isInterestingAlloca(const AllocaInst &AI) {
// dynamic alloca instrumentation for them as well.
!AI.isUsedWithInAlloca() &&
// swifterror allocas are register promoted by ISel
!AI.isSwiftError()) &&
// safe allocas are not interesting
!(SSI && SSI->isSafe(AI));
!AI.isSwiftError());
}
bool HWAddressSanitizer::sanitizeFunction(Function &F) {

42
test/Instrumentation/HWAddressSanitizer/stack-safety-analysis.ll
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@ -1,42 +0,0 @@
; RUN: opt -hwasan -hwasan-use-stack-safety=1 -hwasan-generate-tags-with-calls -S < %s | FileCheck %s --check-prefixes=SAFETY
; RUN: opt -hwasan -hwasan-use-stack-safety=0 -hwasan-generate-tags-with-calls -S < %s | FileCheck %s --check-prefixes=NOSAFETY
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-linux-gnu"
; Check a safe alloca to ensure it does not get a tag.
define i32 @test_load(i32* %a) sanitize_hwaddress {
entry:
; NOSAFETY: call {{.*}}__hwasan_generate_tag
; SAFETY-NOT: call {{.*}}__hwasan_generate_tag
%buf.sroa.0 = alloca i8, align 4
call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull %buf.sroa.0)
store volatile i8 0, i8* %buf.sroa.0, align 4, !tbaa !8
call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull %buf.sroa.0)
ret i32 0
}
; Check a non-safe alloca to ensure it gets a tag.
define i32 @test_use(i32* %a) sanitize_hwaddress {
entry:
; NOSAFETY: call {{.*}}__hwasan_generate_tag
; SAFETY: call {{.*}}__hwasan_generate_tag
%buf.sroa.0 = alloca i8, align 4
call void @use(i8* nonnull %buf.sroa.0)
call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull %buf.sroa.0)
store volatile i8 0, i8* %buf.sroa.0, align 4, !tbaa !8
call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull %buf.sroa.0)
ret i32 0
}
; Function Attrs: argmemonly mustprogress nofree nosync nounwind willreturn
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
; Function Attrs: argmemonly mustprogress nofree nosync nounwind willreturn
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
declare void @use(i8* nocapture)
!8 = !{!9, !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C/C++ TBAA"}