forked from OSchip/llvm-project
552 lines
20 KiB
C++
552 lines
20 KiB
C++
//===-- asan_malloc_win.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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// Windows-specific malloc interception.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_WINDOWS
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#include "asan_allocator.h"
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#include "asan_interceptors.h"
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#include "asan_internal.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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// Intentionally not including windows.h here, to avoid the risk of
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// pulling in conflicting declarations of these functions. (With mingw-w64,
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// there's a risk of windows.h pulling in stdint.h.)
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typedef int BOOL;
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typedef void *HANDLE;
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typedef const void *LPCVOID;
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typedef void *LPVOID;
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typedef unsigned long DWORD;
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constexpr unsigned long HEAP_ZERO_MEMORY = 0x00000008;
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constexpr unsigned long HEAP_REALLOC_IN_PLACE_ONLY = 0x00000010;
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constexpr unsigned long HEAP_ALLOCATE_SUPPORTED_FLAGS = (HEAP_ZERO_MEMORY);
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constexpr unsigned long HEAP_ALLOCATE_UNSUPPORTED_FLAGS =
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(~HEAP_ALLOCATE_SUPPORTED_FLAGS);
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constexpr unsigned long HEAP_FREE_UNSUPPORTED_FLAGS =
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(~HEAP_ALLOCATE_SUPPORTED_FLAGS);
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constexpr unsigned long HEAP_REALLOC_UNSUPPORTED_FLAGS =
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(~HEAP_ALLOCATE_SUPPORTED_FLAGS);
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extern "C" {
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LPVOID WINAPI HeapAlloc(HANDLE hHeap, DWORD dwFlags, size_t dwBytes);
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LPVOID WINAPI HeapReAlloc(HANDLE hHeap, DWORD dwFlags, LPVOID lpMem,
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size_t dwBytes);
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BOOL WINAPI HeapFree(HANDLE hHeap, DWORD dwFlags, LPVOID lpMem);
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size_t WINAPI HeapSize(HANDLE hHeap, DWORD dwFlags, LPCVOID lpMem);
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BOOL WINAPI HeapValidate(HANDLE hHeap, DWORD dwFlags, LPCVOID lpMem);
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}
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using namespace __asan;
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// MT: Simply defining functions with the same signature in *.obj
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// files overrides the standard functions in the CRT.
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// MD: Memory allocation functions are defined in the CRT .dll,
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// so we have to intercept them before they are called for the first time.
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#if ASAN_DYNAMIC
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# define ALLOCATION_FUNCTION_ATTRIBUTE
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#else
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# define ALLOCATION_FUNCTION_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
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#endif
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extern "C" {
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ALLOCATION_FUNCTION_ATTRIBUTE
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size_t _msize(void *ptr) {
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GET_CURRENT_PC_BP_SP;
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(void)sp;
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return asan_malloc_usable_size(ptr, pc, bp);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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size_t _msize_base(void *ptr) {
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return _msize(ptr);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void free(void *ptr) {
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GET_STACK_TRACE_FREE;
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return asan_free(ptr, &stack, FROM_MALLOC);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void _free_dbg(void *ptr, int) {
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free(ptr);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void _free_base(void *ptr) {
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free(ptr);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *malloc(size_t size) {
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GET_STACK_TRACE_MALLOC;
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return asan_malloc(size, &stack);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_malloc_base(size_t size) {
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return malloc(size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_malloc_dbg(size_t size, int, const char *, int) {
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return malloc(size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *calloc(size_t nmemb, size_t size) {
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GET_STACK_TRACE_MALLOC;
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return asan_calloc(nmemb, size, &stack);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_calloc_base(size_t nmemb, size_t size) {
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return calloc(nmemb, size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_calloc_dbg(size_t nmemb, size_t size, int, const char *, int) {
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return calloc(nmemb, size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_calloc_impl(size_t nmemb, size_t size, int *errno_tmp) {
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return calloc(nmemb, size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *realloc(void *ptr, size_t size) {
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GET_STACK_TRACE_MALLOC;
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return asan_realloc(ptr, size, &stack);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_realloc_dbg(void *ptr, size_t size, int) {
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UNREACHABLE("_realloc_dbg should not exist!");
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return 0;
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_realloc_base(void *ptr, size_t size) {
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return realloc(ptr, size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_recalloc(void *p, size_t n, size_t elem_size) {
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if (!p)
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return calloc(n, elem_size);
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const size_t size = n * elem_size;
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if (elem_size != 0 && size / elem_size != n)
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return 0;
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size_t old_size = _msize(p);
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void *new_alloc = malloc(size);
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if (new_alloc) {
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REAL(memcpy)(new_alloc, p, Min<size_t>(size, old_size));
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if (old_size < size)
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REAL(memset)(((u8 *)new_alloc) + old_size, 0, size - old_size);
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free(p);
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}
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return new_alloc;
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_recalloc_base(void *p, size_t n, size_t elem_size) {
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return _recalloc(p, n, elem_size);
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_expand(void *memblock, size_t size) {
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// _expand is used in realloc-like functions to resize the buffer if possible.
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// We don't want memory to stand still while resizing buffers, so return 0.
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return 0;
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}
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ALLOCATION_FUNCTION_ATTRIBUTE
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void *_expand_dbg(void *memblock, size_t size) {
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return _expand(memblock, size);
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}
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// TODO(timurrrr): Might want to add support for _aligned_* allocation
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// functions to detect a bit more bugs. Those functions seem to wrap malloc().
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int _CrtDbgReport(int, const char*, int,
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const char*, const char*, ...) {
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ShowStatsAndAbort();
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}
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int _CrtDbgReportW(int reportType, const wchar_t*, int,
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const wchar_t*, const wchar_t*, ...) {
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ShowStatsAndAbort();
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}
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int _CrtSetReportMode(int, int) {
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return 0;
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}
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} // extern "C"
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#define OWNED_BY_RTL(heap, memory) \
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(!__sanitizer_get_ownership(memory) && HeapValidate(heap, 0, memory))
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INTERCEPTOR_WINAPI(size_t, HeapSize, HANDLE hHeap, DWORD dwFlags,
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LPCVOID lpMem) {
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// If the RTL allocators are hooked we need to check whether the ASAN
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// allocator owns the pointer we're about to use. Allocations occur before
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// interception takes place, so if it is not owned by the RTL heap we can
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// pass it to the ASAN heap for inspection.
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if (flags()->windows_hook_rtl_allocators) {
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if (!asan_inited || OWNED_BY_RTL(hHeap, lpMem))
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return REAL(HeapSize)(hHeap, dwFlags, lpMem);
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} else {
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CHECK(dwFlags == 0 && "unsupported heap flags");
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}
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GET_CURRENT_PC_BP_SP;
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(void)sp;
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return asan_malloc_usable_size(lpMem, pc, bp);
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}
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INTERCEPTOR_WINAPI(LPVOID, HeapAlloc, HANDLE hHeap, DWORD dwFlags,
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size_t dwBytes) {
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// If the ASAN runtime is not initialized, or we encounter an unsupported
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// flag, fall back to the original allocator.
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if (flags()->windows_hook_rtl_allocators) {
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if (UNLIKELY(!asan_inited ||
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(dwFlags & HEAP_ALLOCATE_UNSUPPORTED_FLAGS) != 0)) {
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return REAL(HeapAlloc)(hHeap, dwFlags, dwBytes);
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}
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} else {
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// In the case that we don't hook the rtl allocators,
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// this becomes an assert since there is no failover to the original
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// allocator.
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CHECK((HEAP_ALLOCATE_UNSUPPORTED_FLAGS & dwFlags) != 0 &&
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"unsupported flags");
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}
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GET_STACK_TRACE_MALLOC;
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void *p = asan_malloc(dwBytes, &stack);
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// Reading MSDN suggests that the *entire* usable allocation is zeroed out.
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// Otherwise it is difficult to HeapReAlloc with HEAP_ZERO_MEMORY.
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// https://blogs.msdn.microsoft.com/oldnewthing/20120316-00/?p=8083
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if (p && (dwFlags & HEAP_ZERO_MEMORY)) {
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GET_CURRENT_PC_BP_SP;
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(void)sp;
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auto usable_size = asan_malloc_usable_size(p, pc, bp);
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internal_memset(p, 0, usable_size);
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}
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return p;
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}
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INTERCEPTOR_WINAPI(BOOL, HeapFree, HANDLE hHeap, DWORD dwFlags, LPVOID lpMem) {
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// Heap allocations happen before this function is hooked, so we must fall
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// back to the original function if the pointer is not from the ASAN heap,
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// or unsupported flags are provided.
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if (flags()->windows_hook_rtl_allocators) {
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if (OWNED_BY_RTL(hHeap, lpMem))
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return REAL(HeapFree)(hHeap, dwFlags, lpMem);
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} else {
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CHECK((HEAP_FREE_UNSUPPORTED_FLAGS & dwFlags) != 0 && "unsupported flags");
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}
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GET_STACK_TRACE_FREE;
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asan_free(lpMem, &stack, FROM_MALLOC);
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return true;
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}
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namespace __asan {
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using AllocFunction = LPVOID(WINAPI *)(HANDLE, DWORD, size_t);
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using ReAllocFunction = LPVOID(WINAPI *)(HANDLE, DWORD, LPVOID, size_t);
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using SizeFunction = size_t(WINAPI *)(HANDLE, DWORD, LPVOID);
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using FreeFunction = BOOL(WINAPI *)(HANDLE, DWORD, LPVOID);
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void *SharedReAlloc(ReAllocFunction reallocFunc, SizeFunction heapSizeFunc,
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FreeFunction freeFunc, AllocFunction allocFunc,
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HANDLE hHeap, DWORD dwFlags, LPVOID lpMem, size_t dwBytes) {
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CHECK(reallocFunc && heapSizeFunc && freeFunc && allocFunc);
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GET_STACK_TRACE_MALLOC;
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GET_CURRENT_PC_BP_SP;
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(void)sp;
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if (flags()->windows_hook_rtl_allocators) {
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enum AllocationOwnership { NEITHER = 0, ASAN = 1, RTL = 2 };
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AllocationOwnership ownershipState;
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bool owned_rtlalloc = false;
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bool owned_asan = __sanitizer_get_ownership(lpMem);
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if (!owned_asan)
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owned_rtlalloc = HeapValidate(hHeap, 0, lpMem);
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if (owned_asan && !owned_rtlalloc)
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ownershipState = ASAN;
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else if (!owned_asan && owned_rtlalloc)
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ownershipState = RTL;
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else if (!owned_asan && !owned_rtlalloc)
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ownershipState = NEITHER;
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// If this heap block which was allocated before the ASAN
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// runtime came up, use the real HeapFree function.
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if (UNLIKELY(!asan_inited)) {
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return reallocFunc(hHeap, dwFlags, lpMem, dwBytes);
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}
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bool only_asan_supported_flags =
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(HEAP_REALLOC_UNSUPPORTED_FLAGS & dwFlags) == 0;
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if (ownershipState == RTL ||
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(ownershipState == NEITHER && !only_asan_supported_flags)) {
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if (only_asan_supported_flags) {
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// if this is a conversion to ASAN upported flags, transfer this
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// allocation to the ASAN allocator
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void *replacement_alloc;
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if (dwFlags & HEAP_ZERO_MEMORY)
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replacement_alloc = asan_calloc(1, dwBytes, &stack);
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else
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replacement_alloc = asan_malloc(dwBytes, &stack);
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if (replacement_alloc) {
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size_t old_size = heapSizeFunc(hHeap, dwFlags, lpMem);
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if (old_size == ((size_t)0) - 1) {
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asan_free(replacement_alloc, &stack, FROM_MALLOC);
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return nullptr;
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}
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REAL(memcpy)(replacement_alloc, lpMem, old_size);
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freeFunc(hHeap, dwFlags, lpMem);
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}
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return replacement_alloc;
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} else {
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// owned by rtl or neither with unsupported ASAN flags,
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// just pass back to original allocator
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CHECK(ownershipState == RTL || ownershipState == NEITHER);
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CHECK(!only_asan_supported_flags);
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return reallocFunc(hHeap, dwFlags, lpMem, dwBytes);
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}
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}
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if (ownershipState == ASAN && !only_asan_supported_flags) {
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// Conversion to unsupported flags allocation,
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// transfer this allocation back to the original allocator.
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void *replacement_alloc = allocFunc(hHeap, dwFlags, dwBytes);
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size_t old_usable_size = 0;
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if (replacement_alloc) {
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old_usable_size = asan_malloc_usable_size(lpMem, pc, bp);
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REAL(memcpy)(replacement_alloc, lpMem,
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Min<size_t>(dwBytes, old_usable_size));
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asan_free(lpMem, &stack, FROM_MALLOC);
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}
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return replacement_alloc;
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}
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CHECK((ownershipState == ASAN || ownershipState == NEITHER) &&
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only_asan_supported_flags);
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// At this point we should either be ASAN owned with ASAN supported flags
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// or we owned by neither and have supported flags.
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// Pass through even when it's neither since this could be a null realloc or
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// UAF that ASAN needs to catch.
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} else {
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CHECK((HEAP_REALLOC_UNSUPPORTED_FLAGS & dwFlags) != 0 &&
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"unsupported flags");
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}
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// asan_realloc will never reallocate in place, so for now this flag is
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// unsupported until we figure out a way to fake this.
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if (dwFlags & HEAP_REALLOC_IN_PLACE_ONLY)
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return nullptr;
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// HeapReAlloc and HeapAlloc both happily accept 0 sized allocations.
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// passing a 0 size into asan_realloc will free the allocation.
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// To avoid this and keep behavior consistent, fudge the size if 0.
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// (asan_malloc already does this)
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if (dwBytes == 0)
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dwBytes = 1;
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size_t old_size;
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if (dwFlags & HEAP_ZERO_MEMORY)
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old_size = asan_malloc_usable_size(lpMem, pc, bp);
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void *ptr = asan_realloc(lpMem, dwBytes, &stack);
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if (ptr == nullptr)
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return nullptr;
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if (dwFlags & HEAP_ZERO_MEMORY) {
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size_t new_size = asan_malloc_usable_size(ptr, pc, bp);
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if (old_size < new_size)
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REAL(memset)(((u8 *)ptr) + old_size, 0, new_size - old_size);
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}
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return ptr;
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}
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} // namespace __asan
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INTERCEPTOR_WINAPI(LPVOID, HeapReAlloc, HANDLE hHeap, DWORD dwFlags,
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LPVOID lpMem, size_t dwBytes) {
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return SharedReAlloc(REAL(HeapReAlloc), (SizeFunction)REAL(HeapSize),
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REAL(HeapFree), REAL(HeapAlloc), hHeap, dwFlags, lpMem,
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dwBytes);
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}
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// The following functions are undocumented and subject to change.
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// However, hooking them is necessary to hook Windows heap
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// allocations with detours and their definitions are unlikely to change.
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// Comments in /minkernel/ntos/rtl/heappublic.c indicate that these functions
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// are part of the heap's public interface.
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typedef unsigned long LOGICAL;
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// This function is documented as part of the Driver Development Kit but *not*
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// the Windows Development Kit.
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LOGICAL RtlFreeHeap(void* HeapHandle, DWORD Flags,
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void* BaseAddress);
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// This function is documented as part of the Driver Development Kit but *not*
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// the Windows Development Kit.
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void* RtlAllocateHeap(void* HeapHandle, DWORD Flags, size_t Size);
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// This function is completely undocumented.
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void*
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RtlReAllocateHeap(void* HeapHandle, DWORD Flags, void* BaseAddress,
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size_t Size);
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// This function is completely undocumented.
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size_t RtlSizeHeap(void* HeapHandle, DWORD Flags, void* BaseAddress);
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INTERCEPTOR_WINAPI(size_t, RtlSizeHeap, HANDLE HeapHandle, DWORD Flags,
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void* BaseAddress) {
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if (!flags()->windows_hook_rtl_allocators ||
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UNLIKELY(!asan_inited || OWNED_BY_RTL(HeapHandle, BaseAddress))) {
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return REAL(RtlSizeHeap)(HeapHandle, Flags, BaseAddress);
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}
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GET_CURRENT_PC_BP_SP;
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(void)sp;
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return asan_malloc_usable_size(BaseAddress, pc, bp);
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}
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INTERCEPTOR_WINAPI(BOOL, RtlFreeHeap, HANDLE HeapHandle, DWORD Flags,
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void* BaseAddress) {
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// Heap allocations happen before this function is hooked, so we must fall
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// back to the original function if the pointer is not from the ASAN heap, or
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// unsupported flags are provided.
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if (!flags()->windows_hook_rtl_allocators ||
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UNLIKELY((HEAP_FREE_UNSUPPORTED_FLAGS & Flags) != 0 ||
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OWNED_BY_RTL(HeapHandle, BaseAddress))) {
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return REAL(RtlFreeHeap)(HeapHandle, Flags, BaseAddress);
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}
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GET_STACK_TRACE_FREE;
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asan_free(BaseAddress, &stack, FROM_MALLOC);
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return true;
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}
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INTERCEPTOR_WINAPI(void*, RtlAllocateHeap, HANDLE HeapHandle, DWORD Flags,
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size_t Size) {
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// If the ASAN runtime is not initialized, or we encounter an unsupported
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// flag, fall back to the original allocator.
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if (!flags()->windows_hook_rtl_allocators ||
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UNLIKELY(!asan_inited ||
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(Flags & HEAP_ALLOCATE_UNSUPPORTED_FLAGS) != 0)) {
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return REAL(RtlAllocateHeap)(HeapHandle, Flags, Size);
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}
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GET_STACK_TRACE_MALLOC;
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void *p;
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// Reading MSDN suggests that the *entire* usable allocation is zeroed out.
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// Otherwise it is difficult to HeapReAlloc with HEAP_ZERO_MEMORY.
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// https://blogs.msdn.microsoft.com/oldnewthing/20120316-00/?p=8083
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if (Flags & HEAP_ZERO_MEMORY) {
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p = asan_calloc(Size, 1, &stack);
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} else {
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p = asan_malloc(Size, &stack);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
INTERCEPTOR_WINAPI(void*, RtlReAllocateHeap, HANDLE HeapHandle, DWORD Flags,
|
|
void* BaseAddress, size_t Size) {
|
|
// If it's actually a heap block which was allocated before the ASAN runtime
|
|
// came up, use the real RtlFreeHeap function.
|
|
if (!flags()->windows_hook_rtl_allocators)
|
|
return REAL(RtlReAllocateHeap)(HeapHandle, Flags, BaseAddress, Size);
|
|
|
|
return SharedReAlloc(REAL(RtlReAllocateHeap), REAL(RtlSizeHeap),
|
|
REAL(RtlFreeHeap), REAL(RtlAllocateHeap), HeapHandle,
|
|
Flags, BaseAddress, Size);
|
|
}
|
|
|
|
namespace __asan {
|
|
|
|
static void TryToOverrideFunction(const char *fname, uptr new_func) {
|
|
// Failure here is not fatal. The CRT may not be present, and different CRT
|
|
// versions use different symbols.
|
|
if (!__interception::OverrideFunction(fname, new_func))
|
|
VPrintf(2, "Failed to override function %s\n", fname);
|
|
}
|
|
|
|
void ReplaceSystemMalloc() {
|
|
#if defined(ASAN_DYNAMIC)
|
|
TryToOverrideFunction("free", (uptr)free);
|
|
TryToOverrideFunction("_free_base", (uptr)free);
|
|
TryToOverrideFunction("malloc", (uptr)malloc);
|
|
TryToOverrideFunction("_malloc_base", (uptr)malloc);
|
|
TryToOverrideFunction("_malloc_crt", (uptr)malloc);
|
|
TryToOverrideFunction("calloc", (uptr)calloc);
|
|
TryToOverrideFunction("_calloc_base", (uptr)calloc);
|
|
TryToOverrideFunction("_calloc_crt", (uptr)calloc);
|
|
TryToOverrideFunction("realloc", (uptr)realloc);
|
|
TryToOverrideFunction("_realloc_base", (uptr)realloc);
|
|
TryToOverrideFunction("_realloc_crt", (uptr)realloc);
|
|
TryToOverrideFunction("_recalloc", (uptr)_recalloc);
|
|
TryToOverrideFunction("_recalloc_base", (uptr)_recalloc);
|
|
TryToOverrideFunction("_recalloc_crt", (uptr)_recalloc);
|
|
TryToOverrideFunction("_msize", (uptr)_msize);
|
|
TryToOverrideFunction("_msize_base", (uptr)_msize);
|
|
TryToOverrideFunction("_expand", (uptr)_expand);
|
|
TryToOverrideFunction("_expand_base", (uptr)_expand);
|
|
|
|
if (flags()->windows_hook_rtl_allocators) {
|
|
INTERCEPT_FUNCTION(HeapSize);
|
|
INTERCEPT_FUNCTION(HeapFree);
|
|
INTERCEPT_FUNCTION(HeapReAlloc);
|
|
INTERCEPT_FUNCTION(HeapAlloc);
|
|
|
|
// Undocumented functions must be intercepted by name, not by symbol.
|
|
__interception::OverrideFunction("RtlSizeHeap", (uptr)WRAP(RtlSizeHeap),
|
|
(uptr *)&REAL(RtlSizeHeap));
|
|
__interception::OverrideFunction("RtlFreeHeap", (uptr)WRAP(RtlFreeHeap),
|
|
(uptr *)&REAL(RtlFreeHeap));
|
|
__interception::OverrideFunction("RtlReAllocateHeap",
|
|
(uptr)WRAP(RtlReAllocateHeap),
|
|
(uptr *)&REAL(RtlReAllocateHeap));
|
|
__interception::OverrideFunction("RtlAllocateHeap",
|
|
(uptr)WRAP(RtlAllocateHeap),
|
|
(uptr *)&REAL(RtlAllocateHeap));
|
|
} else {
|
|
#define INTERCEPT_UCRT_FUNCTION(func) \
|
|
if (!INTERCEPT_FUNCTION_DLLIMPORT( \
|
|
"ucrtbase.dll", "api-ms-win-core-heap-l1-1-0.dll", func)) { \
|
|
VPrintf(2, "Failed to intercept ucrtbase.dll import %s\n", #func); \
|
|
}
|
|
INTERCEPT_UCRT_FUNCTION(HeapAlloc);
|
|
INTERCEPT_UCRT_FUNCTION(HeapFree);
|
|
INTERCEPT_UCRT_FUNCTION(HeapReAlloc);
|
|
INTERCEPT_UCRT_FUNCTION(HeapSize);
|
|
#undef INTERCEPT_UCRT_FUNCTION
|
|
}
|
|
// Recent versions of ucrtbase.dll appear to be built with PGO and LTCG, which
|
|
// enable cross-module inlining. This means our _malloc_base hook won't catch
|
|
// all CRT allocations. This code here patches the import table of
|
|
// ucrtbase.dll so that all attempts to use the lower-level win32 heap
|
|
// allocation API will be directed to ASan's heap. We don't currently
|
|
// intercept all calls to HeapAlloc. If we did, we would have to check on
|
|
// HeapFree whether the pointer came from ASan of from the system.
|
|
|
|
#endif // defined(ASAN_DYNAMIC)
|
|
}
|
|
} // namespace __asan
|
|
|
|
#endif // _WIN32
|