| // RUN: %clangxx -frtti -fsanitize=vptr -fno-sanitize-recover=vptr,null -g %s -O3 -o %t |
| // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-CORRUPTED-VTABLE --strict-whitespace |
| |
| // UNSUPPORTED: win32 |
| // REQUIRES: stable-runtime, cxxabi |
| #include <cstddef> |
| |
| #include <typeinfo> |
| |
| struct S { |
| S() {} |
| ~S() {} |
| virtual int v() { return 0; } |
| }; |
| |
| // See the proper definition in ubsan_type_hash_itanium.cc |
| struct VtablePrefix { |
| signed long Offset; |
| std::type_info *TypeInfo; |
| }; |
| |
| int main(int argc, char **argv) { |
| // Test that we don't crash on corrupted vtable when |
| // offset is too large or too small. |
| S Obj; |
| void *Ptr = &Obj; |
| VtablePrefix* RealPrefix = reinterpret_cast<VtablePrefix*>( |
| *reinterpret_cast<void**>(Ptr)) - 1; |
| |
| VtablePrefix Prefix[2]; |
| Prefix[0].Offset = 1<<21; // Greater than VptrMaxOffset |
| Prefix[0].TypeInfo = RealPrefix->TypeInfo; |
| |
| // Hack Vtable ptr for Obj. |
| *reinterpret_cast<void**>(Ptr) = static_cast<void*>(&Prefix[1]); |
| |
| // CHECK-CORRUPTED-VTABLE: vptr-corrupted-vtable-itanium.cpp:[[@LINE+3]]:16: runtime error: member call on address [[PTR:0x[0-9a-f]*]] which does not point to an object of type 'S' |
| // CHECK-CORRUPTED-VTABLE-NEXT: [[PTR]]: note: object has a possibly invalid vptr: abs(offset to top) too big |
| S* Ptr2 = reinterpret_cast<S*>(Ptr); |
| return Ptr2->v(); |
| } |