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205 lines
8.2 KiB
C++
205 lines
8.2 KiB
C++
//===-- asan_interceptors.cpp ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Interceptors for operators new and delete.
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//===----------------------------------------------------------------------===//
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#include "asan_allocator.h"
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#include "asan_internal.h"
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#include "asan_malloc_local.h"
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#include "asan_report.h"
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#include "asan_stack.h"
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#include "interception/interception.h"
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#include <stddef.h>
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// C++ operators can't have dllexport attributes on Windows. We export them
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// anyway by passing extra -export flags to the linker, which is exactly that
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// dllexport would normally do. We need to export them in order to make the
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// VS2015 dynamic CRT (MD) work.
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#if SANITIZER_WINDOWS && defined(_MSC_VER)
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#define CXX_OPERATOR_ATTRIBUTE
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#define COMMENT_EXPORT(sym) __pragma(comment(linker, "/export:" sym))
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#ifdef _WIN64
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COMMENT_EXPORT("??2@YAPEAX_K@Z") // operator new
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COMMENT_EXPORT("??2@YAPEAX_KAEBUnothrow_t@std@@@Z") // operator new nothrow
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COMMENT_EXPORT("??3@YAXPEAX@Z") // operator delete
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COMMENT_EXPORT("??3@YAXPEAX_K@Z") // sized operator delete
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COMMENT_EXPORT("??_U@YAPEAX_K@Z") // operator new[]
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COMMENT_EXPORT("??_V@YAXPEAX@Z") // operator delete[]
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#else
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COMMENT_EXPORT("??2@YAPAXI@Z") // operator new
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COMMENT_EXPORT("??2@YAPAXIABUnothrow_t@std@@@Z") // operator new nothrow
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COMMENT_EXPORT("??3@YAXPAX@Z") // operator delete
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COMMENT_EXPORT("??3@YAXPAXI@Z") // sized operator delete
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COMMENT_EXPORT("??_U@YAPAXI@Z") // operator new[]
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COMMENT_EXPORT("??_V@YAXPAX@Z") // operator delete[]
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#endif
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#undef COMMENT_EXPORT
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#else
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#define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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#endif
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using namespace __asan;
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// FreeBSD prior v9.2 have wrong definition of 'size_t'.
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// http://svnweb.freebsd.org/base?view=revision&revision=232261
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#if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
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#include <sys/param.h>
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#if __FreeBSD_version <= 902001 // v9.2
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#define size_t unsigned
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#endif // __FreeBSD_version
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#endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
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// This code has issues on OSX.
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// See https://github.com/google/sanitizers/issues/131.
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// Fake std::nothrow_t and std::align_val_t to avoid including <new>.
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namespace std {
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struct nothrow_t {};
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enum class align_val_t: size_t {};
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} // namespace std
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// TODO(alekseyshl): throw std::bad_alloc instead of dying on OOM.
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// For local pool allocation, align to SHADOW_GRANULARITY to match asan
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// allocator behavior.
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#define OPERATOR_NEW_BODY(type, nothrow) \
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MAYBE_ALLOCATE_FROM_LOCAL_POOL(nothrow); \
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GET_STACK_TRACE_MALLOC; \
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void *res = asan_memalign(0, size, &stack, type); \
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if (!nothrow && UNLIKELY(!res)) \
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ReportOutOfMemory(size, &stack); \
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return res;
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#define OPERATOR_NEW_BODY_ALIGN(type, nothrow) \
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MAYBE_ALLOCATE_FROM_LOCAL_POOL(nothrow); \
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GET_STACK_TRACE_MALLOC; \
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void *res = asan_memalign((uptr)align, size, &stack, type); \
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if (!nothrow && UNLIKELY(!res)) \
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ReportOutOfMemory(size, &stack); \
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return res;
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// On OS X it's not enough to just provide our own 'operator new' and
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// 'operator delete' implementations, because they're going to be in the
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// runtime dylib, and the main executable will depend on both the runtime
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// dylib and libstdc++, each of those'll have its implementation of new and
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// delete.
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// To make sure that C++ allocation/deallocation operators are overridden on
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// OS X we need to intercept them using their mangled names.
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#if !SANITIZER_MAC
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CXX_OPERATOR_ATTRIBUTE
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void *operator new(size_t size)
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{ OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new[](size_t size)
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{ OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new(size_t size, std::nothrow_t const&)
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{ OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new[](size_t size, std::nothrow_t const&)
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{ OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new(size_t size, std::align_val_t align)
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{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW, false /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new[](size_t size, std::align_val_t align)
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{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, false /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
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{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW, true /*nothrow*/); }
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CXX_OPERATOR_ATTRIBUTE
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void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
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{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, true /*nothrow*/); }
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#else // SANITIZER_MAC
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INTERCEPTOR(void *, _Znwm, size_t size) {
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OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/);
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}
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INTERCEPTOR(void *, _Znam, size_t size) {
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OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/);
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}
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INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
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OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/);
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}
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INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
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OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/);
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}
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#endif // !SANITIZER_MAC
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#define OPERATOR_DELETE_BODY(type) \
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if (IS_FROM_LOCAL_POOL(ptr)) return;\
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GET_STACK_TRACE_FREE;\
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asan_delete(ptr, 0, 0, &stack, type);
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#define OPERATOR_DELETE_BODY_SIZE(type) \
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if (IS_FROM_LOCAL_POOL(ptr)) return;\
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GET_STACK_TRACE_FREE;\
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asan_delete(ptr, size, 0, &stack, type);
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#define OPERATOR_DELETE_BODY_ALIGN(type) \
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if (IS_FROM_LOCAL_POOL(ptr)) return;\
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GET_STACK_TRACE_FREE;\
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asan_delete(ptr, 0, static_cast<uptr>(align), &stack, type);
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#define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \
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if (IS_FROM_LOCAL_POOL(ptr)) return;\
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GET_STACK_TRACE_FREE;\
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asan_delete(ptr, size, static_cast<uptr>(align), &stack, type);
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#if !SANITIZER_MAC
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr) NOEXCEPT
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{ OPERATOR_DELETE_BODY(FROM_NEW); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr) NOEXCEPT
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{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, std::nothrow_t const&)
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{ OPERATOR_DELETE_BODY(FROM_NEW); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, std::nothrow_t const&)
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{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, size_t size) NOEXCEPT
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{ OPERATOR_DELETE_BODY_SIZE(FROM_NEW); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, size_t size) NOEXCEPT
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{ OPERATOR_DELETE_BODY_SIZE(FROM_NEW_BR); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, std::align_val_t align) NOEXCEPT
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{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, std::align_val_t align) NOEXCEPT
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{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, std::align_val_t align, std::nothrow_t const&)
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{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, std::align_val_t align, std::nothrow_t const&)
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{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete(void *ptr, size_t size, std::align_val_t align) NOEXCEPT
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{ OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW); }
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CXX_OPERATOR_ATTRIBUTE
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void operator delete[](void *ptr, size_t size, std::align_val_t align) NOEXCEPT
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{ OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW_BR); }
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#else // SANITIZER_MAC
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INTERCEPTOR(void, _ZdlPv, void *ptr)
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{ OPERATOR_DELETE_BODY(FROM_NEW); }
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INTERCEPTOR(void, _ZdaPv, void *ptr)
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{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
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INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
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{ OPERATOR_DELETE_BODY(FROM_NEW); }
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INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
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{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
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#endif // !SANITIZER_MAC
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