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//===-- asan_malloc_win.cc ------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Windows-specific malloc interception.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_WINDOWS
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "asan_allocator.h"
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_stack.h"
#include "interception/interception.h"
#include <stddef.h>
using namespace __asan; // NOLINT
// MT: Simply defining functions with the same signature in *.obj
// files overrides the standard functions in the CRT.
// MD: Memory allocation functions are defined in the CRT .dll,
// so we have to intercept them before they are called for the first time.
#if ASAN_DYNAMIC
# define ALLOCATION_FUNCTION_ATTRIBUTE
#else
# define ALLOCATION_FUNCTION_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
#endif
extern "C" {
ALLOCATION_FUNCTION_ATTRIBUTE
void free(void *ptr) {
GET_STACK_TRACE_FREE;
return asan_free(ptr, &stack, FROM_MALLOC);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void _free_dbg(void *ptr, int) {
free(ptr);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void _free_base(void *ptr) {
free(ptr);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *malloc(size_t size) {
GET_STACK_TRACE_MALLOC;
return asan_malloc(size, &stack);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_malloc_base(size_t size) {
return malloc(size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_malloc_dbg(size_t size, int, const char *, int) {
return malloc(size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *calloc(size_t nmemb, size_t size) {
GET_STACK_TRACE_MALLOC;
return asan_calloc(nmemb, size, &stack);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_calloc_base(size_t nmemb, size_t size) {
return calloc(nmemb, size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_calloc_dbg(size_t nmemb, size_t size, int, const char *, int) {
return calloc(nmemb, size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_calloc_impl(size_t nmemb, size_t size, int *errno_tmp) {
return calloc(nmemb, size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *realloc(void *ptr, size_t size) {
GET_STACK_TRACE_MALLOC;
return asan_realloc(ptr, size, &stack);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_realloc_dbg(void *ptr, size_t size, int) {
UNREACHABLE("_realloc_dbg should not exist!");
return 0;
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_realloc_base(void *ptr, size_t size) {
return realloc(ptr, size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_recalloc(void *p, size_t n, size_t elem_size) {
if (!p)
return calloc(n, elem_size);
const size_t size = n * elem_size;
if (elem_size != 0 && size / elem_size != n)
return 0;
return realloc(p, size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_recalloc_base(void *p, size_t n, size_t elem_size) {
return _recalloc(p, n, elem_size);
}
ALLOCATION_FUNCTION_ATTRIBUTE
size_t _msize(const void *ptr) {
GET_CURRENT_PC_BP_SP;
(void)sp;
return asan_malloc_usable_size(ptr, pc, bp);
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_expand(void *memblock, size_t size) {
// _expand is used in realloc-like functions to resize the buffer if possible.
// We don't want memory to stand still while resizing buffers, so return 0.
return 0;
}
ALLOCATION_FUNCTION_ATTRIBUTE
void *_expand_dbg(void *memblock, size_t size) {
return _expand(memblock, size);
}
// TODO(timurrrr): Might want to add support for _aligned_* allocation
// functions to detect a bit more bugs. Those functions seem to wrap malloc().
int _CrtDbgReport(int, const char*, int,
const char*, const char*, ...) {
ShowStatsAndAbort();
}
int _CrtDbgReportW(int reportType, const wchar_t*, int,
const wchar_t*, const wchar_t*, ...) {
ShowStatsAndAbort();
}
int _CrtSetReportMode(int, int) {
return 0;
}
} // extern "C"
INTERCEPTOR_WINAPI(LPVOID, HeapAlloc, HANDLE hHeap, DWORD dwFlags,
SIZE_T dwBytes) {
GET_STACK_TRACE_MALLOC;
void *p = asan_malloc(dwBytes, &stack);
// Reading MSDN suggests that the *entire* usable allocation is zeroed out.
// Otherwise it is difficult to HeapReAlloc with HEAP_ZERO_MEMORY.
// https://blogs.msdn.microsoft.com/oldnewthing/20120316-00/?p=8083
if (dwFlags == HEAP_ZERO_MEMORY)
internal_memset(p, 0, asan_mz_size(p));
else
CHECK(dwFlags == 0 && "unsupported heap flags");
return p;
}
INTERCEPTOR_WINAPI(BOOL, HeapFree, HANDLE hHeap, DWORD dwFlags, LPVOID lpMem) {
CHECK(dwFlags == 0 && "unsupported heap flags");
GET_STACK_TRACE_FREE;
asan_free(lpMem, &stack, FROM_MALLOC);
return true;
}
INTERCEPTOR_WINAPI(LPVOID, HeapReAlloc, HANDLE hHeap, DWORD dwFlags,
LPVOID lpMem, SIZE_T dwBytes) {
GET_STACK_TRACE_MALLOC;
// Realloc should never reallocate in place.
if (dwFlags & HEAP_REALLOC_IN_PLACE_ONLY)
return nullptr;
CHECK(dwFlags == 0 && "unsupported heap flags");
return asan_realloc(lpMem, dwBytes, &stack);
}
INTERCEPTOR_WINAPI(SIZE_T, HeapSize, HANDLE hHeap, DWORD dwFlags,
LPCVOID lpMem) {
CHECK(dwFlags == 0 && "unsupported heap flags");
GET_CURRENT_PC_BP_SP;
(void)sp;
return asan_malloc_usable_size(lpMem, pc, bp);
}
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("_expand", (uptr)_expand);
TryToOverrideFunction("_expand_base", (uptr)_expand);
// 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.
#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
#endif
}
} // namespace __asan
#endif // _WIN32