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80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
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//===-- ubsan_type_hash_win.cc --------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementation of type hashing/lookup for Microsoft C++ ABI.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#include "ubsan_platform.h"
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#if CAN_SANITIZE_UB && SANITIZER_WINDOWS
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#include "ubsan_type_hash.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include <typeinfo>
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struct CompleteObjectLocator {
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int is_image_relative;
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int offset_to_top;
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int vfptr_offset;
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int rtti_addr;
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int chd_addr;
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int obj_locator_addr;
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};
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struct CompleteObjectLocatorAbs {
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int is_image_relative;
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int offset_to_top;
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int vfptr_offset;
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std::type_info *rtti_addr;
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void *chd_addr;
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CompleteObjectLocator *obj_locator_addr;
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};
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bool __ubsan::checkDynamicType(void *Object, void *Type, HashValue Hash) {
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// FIXME: Implement.
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return false;
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}
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__ubsan::DynamicTypeInfo
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__ubsan::getDynamicTypeInfoFromVtable(void *VtablePtr) {
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// The virtual table may not have a complete object locator if the object
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// was compiled without RTTI (i.e. we might be reading from some other global
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// laid out before the virtual table), so we need to carefully validate each
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// pointer dereference and perform sanity checks.
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CompleteObjectLocator **obj_locator_ptr =
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((CompleteObjectLocator**)VtablePtr)-1;
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if (!IsAccessibleMemoryRange((uptr)obj_locator_ptr, sizeof(void*)))
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return DynamicTypeInfo(0, 0, 0);
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CompleteObjectLocator *obj_locator = *obj_locator_ptr;
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if (!IsAccessibleMemoryRange((uptr)obj_locator,
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sizeof(CompleteObjectLocator)))
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return DynamicTypeInfo(0, 0, 0);
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std::type_info *tinfo;
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if (obj_locator->is_image_relative == 1) {
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char *image_base = ((char *)obj_locator) - obj_locator->obj_locator_addr;
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tinfo = (std::type_info *)(image_base + obj_locator->rtti_addr);
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} else if (obj_locator->is_image_relative == 0)
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tinfo = ((CompleteObjectLocatorAbs *)obj_locator)->rtti_addr;
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else
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// Probably not a complete object locator.
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return DynamicTypeInfo(0, 0, 0);
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if (!IsAccessibleMemoryRange((uptr)tinfo, sizeof(std::type_info)))
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return DynamicTypeInfo(0, 0, 0);
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// Okay, this is probably a std::type_info. Request its name.
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// FIXME: Implement a base class search like we do for Itanium.
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return DynamicTypeInfo(tinfo->name(), obj_locator->offset_to_top,
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"<unknown>");
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}
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#endif // CAN_SANITIZE_UB && SANITIZER_WINDOWS
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