This patch changes the DFSan instrumentation for aarch64 to instead
of using fixes application mask defined by SANITIZER_AARCH64_VMA
to read the application shadow mask value from compiler-rt. The value
is initialized based on runtime VAM detection.
Along with this patch a compiler-rt one will also be added to export
the shadow mask variable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254196
91177308-0d34-0410-b5e6-
96231b3b80d8
-// VMA size definition for architecture that support multiple sizes.
-// AArch64 has 3 VMA sizes: 39, 42 and 48.
-#ifndef SANITIZER_AARCH64_VMA
-# define SANITIZER_AARCH64_VMA 39
-#else
-# if SANITIZER_AARCH64_VMA != 39 && SANITIZER_AARCH64_VMA != 42
-# error "invalid SANITIZER_AARCH64_VMA size"
-# endif
-#endif
+// External symbol to be used when generating the shadow address for
+// architectures with multiple VMAs. Instead of using a constant integer
+// the runtime will set the external mask based on the VMA range.
+static const char *const kDFSanExternShadowPtrMask = "__dfsan_shadow_ptr_mask";
// The -dfsan-preserve-alignment flag controls whether this pass assumes that
// alignment requirements provided by the input IR are correct. For example,
// The -dfsan-preserve-alignment flag controls whether this pass assumes that
// alignment requirements provided by the input IR are correct. For example,
"load or return with a nonzero label"),
cl::Hidden);
"load or return with a nonzero label"),
cl::Hidden);
namespace {
StringRef GetGlobalTypeString(const GlobalValue &G) {
namespace {
StringRef GetGlobalTypeString(const GlobalValue &G) {
void *(*GetRetvalTLSPtr)();
Constant *GetArgTLS;
Constant *GetRetvalTLS;
void *(*GetRetvalTLSPtr)();
Constant *GetArgTLS;
Constant *GetRetvalTLS;
+ Constant *ExternalShadowMask;
FunctionType *DFSanUnionFnTy;
FunctionType *DFSanUnionLoadFnTy;
FunctionType *DFSanUnimplementedFnTy;
FunctionType *DFSanUnionFnTy;
FunctionType *DFSanUnionLoadFnTy;
FunctionType *DFSanUnimplementedFnTy;
DFSanABIList ABIList;
DenseMap<Value *, Function *> UnwrappedFnMap;
AttributeSet ReadOnlyNoneAttrs;
DFSanABIList ABIList;
DenseMap<Value *, Function *> UnwrappedFnMap;
AttributeSet ReadOnlyNoneAttrs;
+ bool DFSanRuntimeShadowMask;
Value *getShadowAddress(Value *Addr, Instruction *Pos);
bool isInstrumented(const Function *F);
Value *getShadowAddress(Value *Addr, Instruction *Pos);
bool isInstrumented(const Function *F);
DataFlowSanitizer::DataFlowSanitizer(
const std::vector<std::string> &ABIListFiles, void *(*getArgTLS)(),
void *(*getRetValTLS)())
DataFlowSanitizer::DataFlowSanitizer(
const std::vector<std::string> &ABIListFiles, void *(*getArgTLS)(),
void *(*getRetValTLS)())
- : ModulePass(ID), GetArgTLSPtr(getArgTLS), GetRetvalTLSPtr(getRetValTLS) {
+ : ModulePass(ID), GetArgTLSPtr(getArgTLS), GetRetvalTLSPtr(getRetValTLS),
+ DFSanRuntimeShadowMask(false) {
std::vector<std::string> AllABIListFiles(std::move(ABIListFiles));
AllABIListFiles.insert(AllABIListFiles.end(), ClABIListFiles.begin(),
ClABIListFiles.end());
std::vector<std::string> AllABIListFiles(std::move(ABIListFiles));
AllABIListFiles.insert(AllABIListFiles.end(), ClABIListFiles.begin(),
ClABIListFiles.end());
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x700000000000LL);
else if (IsMIPS64)
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0xF000000000LL);
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x700000000000LL);
else if (IsMIPS64)
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0xF000000000LL);
+ // AArch64 supports multiple VMAs and the shadow mask is set at runtime.
-#if SANITIZER_AARCH64_VMA == 39
- ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x7800000000LL);
-#else
- ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x3c000000000LL);
-#endif
+ DFSanRuntimeShadowMask = true;
else
report_fatal_error("unsupported triple");
else
report_fatal_error("unsupported triple");
G->setThreadLocalMode(GlobalVariable::InitialExecTLSModel);
}
G->setThreadLocalMode(GlobalVariable::InitialExecTLSModel);
}
+ ExternalShadowMask =
+ Mod->getOrInsertGlobal(kDFSanExternShadowPtrMask, IntptrTy);
+
DFSanUnionFn = Mod->getOrInsertFunction("__dfsan_union", DFSanUnionFnTy);
if (Function *F = dyn_cast<Function>(DFSanUnionFn)) {
F->addAttribute(AttributeSet::FunctionIndex, Attribute::NoUnwind);
DFSanUnionFn = Mod->getOrInsertFunction("__dfsan_union", DFSanUnionFnTy);
if (Function *F = dyn_cast<Function>(DFSanUnionFn)) {
F->addAttribute(AttributeSet::FunctionIndex, Attribute::NoUnwind);
Value *DataFlowSanitizer::getShadowAddress(Value *Addr, Instruction *Pos) {
assert(Addr != RetvalTLS && "Reinstrumenting?");
IRBuilder<> IRB(Pos);
Value *DataFlowSanitizer::getShadowAddress(Value *Addr, Instruction *Pos) {
assert(Addr != RetvalTLS && "Reinstrumenting?");
IRBuilder<> IRB(Pos);
+ Value *ShadowPtrMaskValue;
+ if (DFSanRuntimeShadowMask)
+ ShadowPtrMaskValue = IRB.CreateLoad(IntptrTy, ExternalShadowMask);
+ else
+ ShadowPtrMaskValue = ShadowPtrMask;
return IRB.CreateIntToPtr(
IRB.CreateMul(
return IRB.CreateIntToPtr(
IRB.CreateMul(
- IRB.CreateAnd(IRB.CreatePtrToInt(Addr, IntptrTy), ShadowPtrMask),
+ IRB.CreateAnd(IRB.CreatePtrToInt(Addr, IntptrTy),
+ IRB.CreatePtrToInt(ShadowPtrMaskValue, IntptrTy)),
ShadowPtrMul),
ShadowPtrTy);
}
ShadowPtrMul),
ShadowPtrTy);
}
--- /dev/null
+; RUN: opt < %s -dfsan -S | FileCheck %s
+target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-gnu"
+
+define i32 @test(i32 %a, i32* nocapture readonly %b) #0 {
+; CHECK: @"dfs$test"
+; CHECK: %[[RV:.*]] load{{.*}}__dfsan_shadow_ptr_mask
+; CHECK: ptrtoint i32* {{.*}} to i64
+; CHECK: and {{.*}}%[[RV:.*]]
+; CHECK: mul i64
+ %1 = load i32, i32* %b, align 4
+ %2 = add nsw i32 %1, %a
+ ret i32 %2
+}