forked from OSchip/llvm-project
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//===-- dfsan_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 DataFlowSanitizer.
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//
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// Interceptors for standard library functions.
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//===----------------------------------------------------------------------===//
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#include <sys/syscall.h>
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#include <unistd.h>
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#include "dfsan/dfsan.h"
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#include "interception/interception.h"
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#include "sanitizer_common/sanitizer_common.h"
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using namespace __sanitizer;
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namespace {
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bool interceptors_initialized;
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} // namespace
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INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
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int fd, OFF_T offset) {
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void *res;
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// interceptors_initialized is set to true during preinit_array, when we're
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// single-threaded. So we don't need to worry about accessing it atomically.
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if (!interceptors_initialized)
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res = (void *)syscall(__NR_mmap, addr, length, prot, flags, fd, offset);
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else
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res = REAL(mmap)(addr, length, prot, flags, fd, offset);
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if (res != (void *)-1)
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dfsan_set_label(0, res, RoundUpTo(length, GetPageSizeCached()));
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return res;
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}
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INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
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int fd, OFF64_T offset) {
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void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
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if (res != (void *)-1)
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dfsan_set_label(0, res, RoundUpTo(length, GetPageSizeCached()));
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return res;
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}
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INTERCEPTOR(int, munmap, void *addr, SIZE_T length) {
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int res = REAL(munmap)(addr, length);
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if (res != -1)
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dfsan_set_label(0, addr, RoundUpTo(length, GetPageSizeCached()));
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return res;
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}
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namespace __dfsan {
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void InitializeInterceptors() {
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CHECK(!interceptors_initialized);
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INTERCEPT_FUNCTION(mmap);
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INTERCEPT_FUNCTION(mmap64);
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INTERCEPT_FUNCTION(munmap);
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interceptors_initialized = true;
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}
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} // namespace __dfsan
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