src: improve memory sanitizer handling

src/util/membuffer.cpp

@@ -47,7 +47,7 @@ unsigned membuffer_get_size(MemBuffer &mb) noexcept { return mb.getSize(); }
 // bool use_simple_mcheck()
 **************************************************************************/
 
-#if defined(__SANITIZE_ADDRESS__)
+#if defined(__SANITIZE_ADDRESS__) || defined(__SANITIZE_MEMORY__)
 static forceinline constexpr bool use_simple_mcheck() noexcept { return false; }
 #elif (WITH_VALGRIND) && defined(RUNNING_ON_VALGRIND)
 static bool use_simple_mcheck_flag;
@@ -190,7 +190,7 @@ void MemBuffer::alloc(upx_uint64_t bytes) {
         set_ne32(p + size_in_bytes + 4, stats.global_alloc_counter);
     }
     ptr = (pointer) (void *) p;
-#if DEBUG
+#if !defined(__SANITIZE_MEMORY__) && DEBUG
     memset(ptr, 0xfb, size_in_bytes);
     (void) VALGRIND_MAKE_MEM_UNDEFINED(ptr, size_in_bytes);
 #endif

src/util/util.h

@@ -70,12 +70,18 @@ inline void mem_size_assert(upx_uint64_t element_size, upx_uint64_t n) {
 #if DEBUG
 template <class T>
 T *NewArray(upx_uint64_t n) {
+    COMPILE_TIME_ASSERT(std::is_standard_layout<T>::value)
+    COMPILE_TIME_ASSERT(std::is_trivially_copyable<T>::value)
+    COMPILE_TIME_ASSERT(std::is_trivially_default_constructible<T>::value)
     size_t bytes = mem_size(sizeof(T), n); // assert size
     T *array = new T[size_t(n)];
+#if !defined(__SANITIZE_MEMORY__)
     if (array != nullptr && bytes > 0) {
         memset(array, 0xfb, bytes);
         (void) VALGRIND_MAKE_MEM_UNDEFINED(array, bytes);
     }
+#endif
+    UNUSED(bytes);
     return array;
 }
 #define New(type, n) (NewArray<type>((n)))