zbrid created this revision.
Herald added subscribers: llvm-commits, Sanitizers, cfe-commits, hiraditya.
Herald added projects: clang, Sanitizers, LLVM.
zbrid requested review of this revision.
Not intended to be reviewed. I only uploaded this patch to have a
link to share.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D85039
Files:
clang/lib/CodeGen/BackendUtil.cpp
compiler-rt/lib/asan/asan_globals.cpp
llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
load.c
Index: load.c
===================================================================
--- /dev/null
+++ load.c
@@ -0,0 +1,6 @@
+int load(int *p) { return *p; }
+
+int main() {
+ int i = 10;
+ load(&i);
+}
Index: llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
===================================================================
--- llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
+++ llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
@@ -1058,6 +1058,12 @@
getArgTLSPtr(), 0, Idx);
}
+static void SetNoSanitizeMetadata(Instruction *I) {
+ I->setMetadata(
+ I->getParent()->getParent()->getParent()->getMDKindID("nosanitize"),
+ MDNode::get(I->getContext(), None));
+}
+
Value *DFSanFunction::getShadow(Value *V) {
if (!isa<Argument>(V) && !isa<Instruction>(V))
return DFS.ZeroShadow;
@@ -1073,8 +1079,10 @@
DFS.ArgTLS ? &*F->getEntryBlock().begin()
: cast<Instruction>(ArgTLSPtr)->getNextNode();
IRBuilder<> IRB(ArgTLSPos);
- Shadow =
+ LoadInst *LI =
IRB.CreateLoad(DFS.ShadowTy, getArgTLS(A->getArgNo(), ArgTLSPos));
+ SetNoSanitizeMetadata(LI);
+ Shadow = LI;
break;
}
case DataFlowSanitizer::IA_Args: {
@@ -1105,9 +1113,11 @@
assert(Addr != RetvalTLS && "Reinstrumenting?");
IRBuilder<> IRB(Pos);
Value *ShadowPtrMaskValue;
- if (DFSanRuntimeShadowMask)
- ShadowPtrMaskValue = IRB.CreateLoad(IntptrTy, ExternalShadowMask);
- else
+ if (DFSanRuntimeShadowMask) {
+ LoadInst *LI = IRB.CreateLoad(IntptrTy, ExternalShadowMask);
+ SetNoSanitizeMetadata(LI);
+ ShadowPtrMaskValue = LI;
+ } else
ShadowPtrMaskValue = ShadowPtrMask;
return IRB.CreateIntToPtr(
IRB.CreateMul(
@@ -1225,7 +1235,9 @@
const auto i = AllocaShadowMap.find(AI);
if (i != AllocaShadowMap.end()) {
IRBuilder<> IRB(Pos);
- return IRB.CreateLoad(DFS.ShadowTy, i->second);
+ LoadInst *LI = IRB.CreateLoad(DFS.ShadowTy, i->second);
+ SetNoSanitizeMetadata(LI);
+ return LI;
}
}
@@ -1366,7 +1378,8 @@
const auto i = AllocaShadowMap.find(AI);
if (i != AllocaShadowMap.end()) {
IRBuilder<> IRB(Pos);
- IRB.CreateStore(Shadow, i->second);
+ StoreInst *SI = IRB.CreateStore(Shadow, i->second);
+ SetNoSanitizeMetadata(SI);
return;
}
}
@@ -1559,7 +1572,8 @@
case DataFlowSanitizer::IA_TLS: {
Value *S = DFSF.getShadow(RI.getReturnValue());
IRBuilder<> IRB(&RI);
- IRB.CreateStore(S, DFSF.getRetvalTLS());
+ StoreInst *SI = IRB.CreateStore(S, DFSF.getRetvalTLS());
+ SetNoSanitizeMetadata(SI);
break;
}
case DataFlowSanitizer::IA_Args: {
@@ -1666,7 +1680,8 @@
for (unsigned n = 0; i != CB.arg_end(); ++i, ++n) {
auto LabelVAPtr = IRB.CreateStructGEP(LabelVATy, LabelVAAlloca, n);
- IRB.CreateStore(DFSF.getShadow(*i), LabelVAPtr);
+ StoreInst *SI = IRB.CreateStore(DFSF.getShadow(*i), LabelVAPtr);
+ SetNoSanitizeMetadata(SI);
}
Args.push_back(IRB.CreateStructGEP(LabelVATy, LabelVAAlloca, 0));
@@ -1702,6 +1717,7 @@
if (!FT->getReturnType()->isVoidTy()) {
LoadInst *LabelLoad =
IRB.CreateLoad(DFSF.DFS.ShadowTy, DFSF.LabelReturnAlloca);
+ SetNoSanitizeMetadata(LabelLoad);
DFSF.setShadow(CustomCI, LabelLoad);
}
@@ -1716,8 +1732,9 @@
FunctionType *FT = CB.getFunctionType();
if (DFSF.DFS.getInstrumentedABI() == DataFlowSanitizer::IA_TLS) {
for (unsigned i = 0, n = FT->getNumParams(); i != n; ++i) {
- IRB.CreateStore(DFSF.getShadow(CB.getArgOperand(i)),
- DFSF.getArgTLS(i, &CB));
+ StoreInst *SI = IRB.CreateStore(DFSF.getShadow(CB.getArgOperand(i)),
+ DFSF.getArgTLS(i, &CB));
+ SetNoSanitizeMetadata(SI);
}
}
@@ -1739,6 +1756,7 @@
if (DFSF.DFS.getInstrumentedABI() == DataFlowSanitizer::IA_TLS) {
IRBuilder<> NextIRB(Next);
LoadInst *LI = NextIRB.CreateLoad(DFSF.DFS.ShadowTy, DFSF.getRetvalTLS());
+ SetNoSanitizeMetadata(LI);
DFSF.SkipInsts.insert(LI);
DFSF.setShadow(&CB, LI);
DFSF.NonZeroChecks.push_back(LI);
@@ -1769,9 +1787,10 @@
"", &DFSF.F->getEntryBlock().front());
Args.push_back(IRB.CreateConstGEP2_32(VarArgArrayTy, VarArgShadow, 0, 0));
for (unsigned n = 0; i != E; ++i, ++n) {
- IRB.CreateStore(
+ StoreInst *SI = IRB.CreateStore(
DFSF.getShadow(*i),
IRB.CreateConstGEP2_32(VarArgArrayTy, VarArgShadow, 0, n));
+ SetNoSanitizeMetadata(SI);
Args.push_back(*i);
}
}
Index: compiler-rt/lib/asan/asan_globals.cpp
===================================================================
--- compiler-rt/lib/asan/asan_globals.cpp
+++ compiler-rt/lib/asan/asan_globals.cpp
@@ -26,6 +26,28 @@
#include "sanitizer_common/sanitizer_stackdepot.h"
#include "sanitizer_common/sanitizer_symbolizer.h"
+typedef __sanitizer::u16 dfsan_label;
+
+SANITIZER_INTERFACE_ATTRIBUTE THREADLOCAL dfsan_label __dfsan_retval_tls;
+SANITIZER_INTERFACE_ATTRIBUTE THREADLOCAL dfsan_label __dfsan_arg_tls[64];
+
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE dfsan_label
+__dfsan_union(dfsan_label l1, dfsan_label l2) {
+ // if (flags().fast16labels)
+ return l1 | l2;
+}
+
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE dfsan_label
+__dfsan_union_load(const dfsan_label *ls, uptr n) {
+ dfsan_label label = ls[0];
+ for (uptr i = 1; i != n; ++i) {
+ dfsan_label next_label = ls[i];
+ if (label != next_label)
+ label = __dfsan_union(label, next_label);
+ }
+ return label;
+}
+
namespace __asan {
typedef __asan_global Global;
Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -673,6 +673,16 @@
addSanitizerCoveragePass);
}
+ // Move this here, so DFSan runs before ASan.
+ // Also change conditional, so DFSan's instrumentation pass runs when ASan
+ // is enabled.
+ if (LangOpts.Sanitize.has(SanitizerKind::Address)) {
+ PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
+ addDataFlowSanitizerPass);
+ PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
+ addDataFlowSanitizerPass);
+ }
+
if (LangOpts.Sanitize.has(SanitizerKind::Address)) {
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
addAddressSanitizerPasses);
@@ -722,13 +732,6 @@
addThreadSanitizerPass);
}
- if (LangOpts.Sanitize.has(SanitizerKind::DataFlow)) {
- PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
- addDataFlowSanitizerPass);
- PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
- addDataFlowSanitizerPass);
- }
-
// Set up the per-function pass manager.
FPM.add(new TargetLibraryInfoWrapperPass(*TLII));
if (CodeGenOpts.VerifyModule)
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