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CodeGen: Add CFI unrelated cast checks to the new pointer code path.

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llvm-svn: 247105
This commit is contained in:
Peter Collingbourne 2015-09-09 00:01:31 +00:00
parent 84df12375c
commit ee381ffba4
2 changed files with 24 additions and 0 deletions
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8
clang/lib/CodeGen/CGExpr.cpp
View File

@ -820,6 +820,14 @@ Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
getNaturalPointeeTypeAlignment(E->getType(), Source));
}
if (SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
if (auto PT = E->getType()->getAs<PointerType>())
EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
/*MayBeNull=*/true,
CodeGenFunction::CFITCK_UnrelatedCast,
CE->getLocStart());
}
return Builder.CreateBitCast(Addr, ConvertType(E->getType()));
}
break;

16
clang/test/CodeGenCXX/cfi-cast.cpp
View File

@ -107,3 +107,19 @@ void vcp(void *p) {
// CHECK-UCAST-STRICT: [[P:%[^ ]*]] = call i1 @llvm.bitset.test(i8* {{%[^ ]*}}, metadata !"1C")
static_cast<C*>(p);
}
// CHECK-UCAST-LABEL: define void @_Z3bcpP1B
// CHECK-UCAST-STRICT-LABEL: define void @_Z3bcpP1B
void bcp(B *p) {
// CHECK-UCAST: [[P:%[^ ]*]] = call i1 @llvm.bitset.test(i8* {{%[^ ]*}}, metadata !"1A")
// CHECK-UCAST-STRICT: [[P:%[^ ]*]] = call i1 @llvm.bitset.test(i8* {{%[^ ]*}}, metadata !"1C")
(C *)p;
}
// CHECK-UCAST-LABEL: define void @_Z8bcp_callP1B
// CHECK-UCAST-STRICT-LABEL: define void @_Z8bcp_callP1B
void bcp_call(B *p) {
// CHECK-UCAST: [[P:%[^ ]*]] = call i1 @llvm.bitset.test(i8* {{%[^ ]*}}, metadata !"1A")
// CHECK-UCAST-STRICT: [[P:%[^ ]*]] = call i1 @llvm.bitset.test(i8* {{%[^ ]*}}, metadata !"1C")
((C *)p)->f();
}