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//===-- asan_interceptors_memintrinsics.cpp -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===---------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// ASan versions of memcpy, memmove, and memset.
//===---------------------------------------------------------------------===//
#define SANITIZER_COMMON_NO_REDEFINE_BUILTINS
#include "asan_interceptors_memintrinsics.h"
#include "asan_interceptors.h"
#include "asan_report.h"
#include "asan_stack.h"
#include "asan_suppressions.h"
using namespace __asan;
// memcpy is called during __asan_init() from the internals of printf(...).
// We do not treat memcpy with to==from as a bug.
// See http://llvm.org/bugs/show_bug.cgi?id=11763.
#define ASAN_MEMCPY_IMPL(ctx, to, from, size) \
do { \
if (LIKELY(replace_intrin_cached)) { \
if (LIKELY(to != from)) { \
CHECK_RANGES_OVERLAP("memcpy", to, size, from, size); \
} \
ASAN_READ_RANGE(ctx, from, size); \
ASAN_WRITE_RANGE(ctx, to, size); \
} else if (UNLIKELY(!AsanInited())) { \
return internal_memcpy(to, from, size); \
} \
return REAL(memcpy)(to, from, size); \
} while (0)
// memset is called inside Printf.
#define ASAN_MEMSET_IMPL(ctx, block, c, size) \
do { \
if (LIKELY(replace_intrin_cached)) { \
ASAN_WRITE_RANGE(ctx, block, size); \
} else if (UNLIKELY(!AsanInited())) { \
return internal_memset(block, c, size); \
} \
return REAL(memset)(block, c, size); \
} while (0)
#define ASAN_MEMMOVE_IMPL(ctx, to, from, size) \
do { \
if (LIKELY(replace_intrin_cached)) { \
ASAN_READ_RANGE(ctx, from, size); \
ASAN_WRITE_RANGE(ctx, to, size); \
} \
return internal_memmove(to, from, size); \
} while (0)
void *__asan_memcpy(void *to, const void *from, uptr size) {
ASAN_MEMCPY_IMPL(nullptr, to, from, size);
}
void *__asan_memset(void *block, int c, uptr size) {
ASAN_MEMSET_IMPL(nullptr, block, c, size);
}
void *__asan_memmove(void *to, const void *from, uptr size) {
ASAN_MEMMOVE_IMPL(nullptr, to, from, size);
}
#if SANITIZER_FUCHSIA
// Fuchsia doesn't use sanitizer_common_interceptors.inc, but
// the only things there it wants are these three. Just define them
// as aliases here rather than repeating the contents.
extern "C" decltype(__asan_memcpy) memcpy[[gnu::alias("__asan_memcpy")]];
extern "C" decltype(__asan_memmove) memmove[[gnu::alias("__asan_memmove")]];
extern "C" decltype(__asan_memset) memset[[gnu::alias("__asan_memset")]];
#else // SANITIZER_FUCHSIA
#define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
do { \
ASAN_INTERCEPTOR_ENTER(ctx, memmove); \
ASAN_MEMMOVE_IMPL(ctx, to, from, size); \
} while (false)
#define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
do { \
ASAN_INTERCEPTOR_ENTER(ctx, memcpy); \
ASAN_MEMCPY_IMPL(ctx, to, from, size); \
} while (false)
#define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
do { \
ASAN_INTERCEPTOR_ENTER(ctx, memset); \
ASAN_MEMSET_IMPL(ctx, block, c, size); \
} while (false)
#include "sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc"
#endif // SANITIZER_FUCHSIA
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