| 1 | //===-- interception_aix.cpp ------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file is a part of AddressSanitizer, an address sanity checker. |
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| 10 | // |
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| 11 | // AIX-specific interception methods. |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "interception.h" |
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| 15 | #include "sanitizer_common/sanitizer_common.h" |
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| 16 | |
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| 17 | #if SANITIZER_AIX |
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| 18 | |
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| 19 | # include <dlfcn.h> // for dlsym() |
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| 20 | |
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| 21 | namespace __interception { |
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| 22 | |
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| 23 | static void *GetFuncAddr(const char *name, uptr wrapper_addr) { |
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| 24 | // AIX dlsym can only defect the functions that are exported, so |
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| 25 | // on AIX, we can not intercept some basic functions like memcpy. |
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| 26 | // FIXME: if we are going to ship dynamic asan library, we may need to search |
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| 27 | // all the loaded modules with RTLD_DEFAULT if RTLD_NEXT failed. |
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| 28 | void *addr = dlsym(RTLD_NEXT, name); |
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| 29 | |
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| 30 | // In case `name' is not loaded, dlsym ends up finding the actual wrapper. |
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| 31 | // We don't want to intercept the wrapper and have it point to itself. |
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| 32 | if ((uptr)addr == wrapper_addr) |
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| 33 | addr = nullptr; |
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| 34 | return addr; |
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| 35 | } |
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| 36 | |
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| 37 | bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func, |
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| 38 | uptr wrapper) { |
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| 39 | void *addr = GetFuncAddr(name, wrapper); |
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| 40 | *ptr_to_real = (uptr)addr; |
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| 41 | return addr && (func == wrapper); |
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| 42 | } |
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| 43 | |
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| 44 | } // namespace __interception |
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| 45 | #endif // SANITIZER_AIX |
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| 46 | |
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