155b7a1282
Since glibc 2.40 some functions like openat make use of overloads when built with `-D_FORTIFY_SOURCE=2`, see: https://github.com/bminor/glibc/blob/master/io/bits/fcntl2.h This means that doing something like `(uintptr_t) openat` or `(void *) openat` is now ambiguous, breaking the compiler-rt build on new glibc versions. Fix this by explicitly casting the symbol to the expected function type before casting it to an intptr. The expected type is obtained as `decltype(REAL(func))` so we don't have to repeat the signature from INTERCEPTOR in the INTERCEPT_FUNTION macro. Fixes https://github.com/llvm/llvm-project/issues/100754.
56 lines
2.4 KiB
C++
56 lines
2.4 KiB
C++
//===-- interception_linux.h ------------------------------------*- 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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// Linux-specific interception methods.
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//===----------------------------------------------------------------------===//
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#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
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SANITIZER_SOLARIS
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#if !defined(INCLUDED_FROM_INTERCEPTION_LIB)
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# error interception_linux.h should be included from interception library only
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#endif
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#ifndef INTERCEPTION_LINUX_H
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#define INTERCEPTION_LINUX_H
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namespace __interception {
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bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
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uptr trampoline);
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bool InterceptFunction(const char *name, const char *ver, uptr *ptr_to_real,
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uptr func, uptr trampoline);
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} // namespace __interception
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// Cast func to type of REAL(func) before casting to uptr in case it is an
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// overloaded function, which is the case for some glibc functions when
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// _FORTIFY_SOURCE is used. This disambiguates which overload to use.
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#define INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func) \
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::__interception::InterceptFunction( \
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#func, (::__interception::uptr *)&REAL(func), \
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(::__interception::uptr)(decltype(REAL(func)))&(func), \
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(::__interception::uptr) &TRAMPOLINE(func))
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// dlvsym is a GNU extension supported by some other platforms.
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#if SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
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#define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
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::__interception::InterceptFunction( \
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#func, symver, \
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(::__interception::uptr *)&REAL(func), \
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(::__interception::uptr)(decltype(REAL(func)))&(func), \
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(::__interception::uptr)&TRAMPOLINE(func))
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#else
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#define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
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INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)
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#endif // SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
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#endif // INTERCEPTION_LINUX_H
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#endif // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
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// SANITIZER_SOLARIS
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