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Merge commit f577bfb99528 from llvm-project (by Alexander Potapenko):

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[sanitizer][msan] fix AArch64 vararg support for KMSAN (#70660)

  Cast StackSaveAreaPtr, GrRegSaveAreaPtr, VrRegSaveAreaPtr to pointers to
  fix assertions in getShadowOriginPtrKernel().

  Fixes: https://github.com/llvm/llvm-project/issues/69738

  Patch by Mark Johnston.

Requested by:	markj
MFC after:	3 days
This commit is contained in:
Dimitry Andric 2024-02-08 20:19:27 +01:00
parent 32a6df57df
commit cf67576852
1 changed files with 13 additions and 3 deletions
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16
contrib/llvm-project/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -1718,6 +1718,12 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
std::pair<Value *, Value *>
getShadowOriginPtrUserspace(Value *Addr, IRBuilder<> &IRB, Type *ShadowTy,
MaybeAlign Alignment) {
VectorType *VectTy = dyn_cast<VectorType>(Addr->getType());
if (!VectTy) {
assert(Addr->getType()->isPointerTy());
} else {
assert(VectTy->getElementType()->isPointerTy());
}
Type *IntptrTy = ptrToIntPtrType(Addr->getType());
Value *ShadowOffset = getShadowPtrOffset(Addr, IRB);
Value *ShadowLong = ShadowOffset;
@ -5262,21 +5268,25 @@ struct VarArgAArch64Helper : public VarArgHelper {
// we need to adjust the offset for both GR and VR fields based on
// the __{gr,vr}_offs value (since they are stores based on incoming
// named arguments).
Type *RegSaveAreaPtrTy = IRB.getInt8PtrTy();
// Read the stack pointer from the va_list.
Value *StackSaveAreaPtr = getVAField64(IRB, VAListTag, 0);
Value *StackSaveAreaPtr =
IRB.CreateIntToPtr(getVAField64(IRB, VAListTag, 0), RegSaveAreaPtrTy);
// Read both the __gr_top and __gr_off and add them up.
Value *GrTopSaveAreaPtr = getVAField64(IRB, VAListTag, 8);
Value *GrOffSaveArea = getVAField32(IRB, VAListTag, 24);
Value *GrRegSaveAreaPtr = IRB.CreateAdd(GrTopSaveAreaPtr, GrOffSaveArea);
Value *GrRegSaveAreaPtr = IRB.CreateIntToPtr(
IRB.CreateAdd(GrTopSaveAreaPtr, GrOffSaveArea), RegSaveAreaPtrTy);
// Read both the __vr_top and __vr_off and add them up.
Value *VrTopSaveAreaPtr = getVAField64(IRB, VAListTag, 16);
Value *VrOffSaveArea = getVAField32(IRB, VAListTag, 28);
Value *VrRegSaveAreaPtr = IRB.CreateAdd(VrTopSaveAreaPtr, VrOffSaveArea);
Value *VrRegSaveAreaPtr = IRB.CreateIntToPtr(
IRB.CreateAdd(VrTopSaveAreaPtr, VrOffSaveArea), RegSaveAreaPtrTy);
// It does not know how many named arguments is being used and, on the
// callsite all the arguments were saved. Since __gr_off is defined as