75e61333f0
Implement AIX specific interception functions. Issue: https://github.com/llvm/llvm-project/issues/138916
46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
//===-- interception_aix.cpp ------------------------------------*- C++ -*-===//
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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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// AIX-specific interception methods.
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//===----------------------------------------------------------------------===//
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#include "interception.h"
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#include "sanitizer_common/sanitizer_common.h"
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#if SANITIZER_AIX
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# include <dlfcn.h> // for dlsym()
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namespace __interception {
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static void *GetFuncAddr(const char *name, uptr wrapper_addr) {
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// AIX dlsym can only defect the functions that are exported, so
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// on AIX, we can not intercept some basic functions like memcpy.
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// FIXME: if we are going to ship dynamic asan library, we may need to search
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// all the loaded modules with RTLD_DEFAULT if RTLD_NEXT failed.
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void *addr = dlsym(RTLD_NEXT, name);
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// In case `name' is not loaded, dlsym ends up finding the actual wrapper.
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// We don't want to intercept the wrapper and have it point to itself.
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if ((uptr)addr == wrapper_addr)
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addr = nullptr;
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return addr;
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}
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bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
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uptr wrapper) {
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void *addr = GetFuncAddr(name, wrapper);
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*ptr_to_real = (uptr)addr;
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return addr && (func == wrapper);
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}
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} // namespace __interception
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#endif // SANITIZER_AIX
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