8219d92987
* rename is_compiler_rt_or_libc to skip_linker_dependencies and set it to `true` for all sub-Compilations. I believe this resolves the deadlock we were experiencing on Drone CI and on some users' computers. I will remove the CI workaround in a follow-up commit. * enabling TSAN automatically causes the Compilation to link against libc++ even if not requested, because TSAN depends on libc++. * add -fno-rtti flags where appropriate when building TSAN objects. Thanks Firefox317 for pointing this out. * TSAN support: resolve all the undefined symbols. We are still seeing a dependency on __gcc_personality_v0 but will resolve this one in a follow-up commit. * static libs do not try to build libc++ or libc++abi.
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
//===-- interception_linux.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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// Linux-specific interception methods.
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//===----------------------------------------------------------------------===//
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#include "interception.h"
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#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
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SANITIZER_OPENBSD || SANITIZER_SOLARIS
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#include <dlfcn.h> // for dlsym() and dlvsym()
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namespace __interception {
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#if SANITIZER_NETBSD
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static int StrCmp(const char *s1, const char *s2) {
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while (true) {
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if (*s1 != *s2)
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return false;
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if (*s1 == 0)
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return true;
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s1++;
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s2++;
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}
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}
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#endif
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static void *GetFuncAddr(const char *name, uptr wrapper_addr) {
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#if SANITIZER_NETBSD
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// FIXME: Find a better way to handle renames
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if (StrCmp(name, "sigaction"))
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name = "__sigaction14";
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#endif
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void *addr = dlsym(RTLD_NEXT, name);
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if (!addr) {
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// If the lookup using RTLD_NEXT failed, the sanitizer runtime library is
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// later in the library search order than the DSO that we are trying to
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// intercept, which means that we cannot intercept this function. We still
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// want the address of the real definition, though, so look it up using
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// RTLD_DEFAULT.
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addr = dlsym(RTLD_DEFAULT, 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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}
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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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// Android and Solaris do not have dlvsym
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#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS && !SANITIZER_OPENBSD
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static void *GetFuncAddr(const char *name, const char *ver) {
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return dlvsym(RTLD_NEXT, name, ver);
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}
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bool InterceptFunction(const char *name, const char *ver, uptr *ptr_to_real,
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uptr func, uptr wrapper) {
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void *addr = GetFuncAddr(name, ver);
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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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#endif // !SANITIZER_ANDROID
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} // namespace __interception
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#endif // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
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// SANITIZER_OPENBSD || SANITIZER_SOLARIS
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