b667dd7017
2019-08-14 Martin Liska <mliska@suse.cz> PR sanitizer/89832 PR sanitizer/91325 * All source files: Merge from upstream 368656. From-SVN: r274426
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
//=-- ubsan_signals_standalone.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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// Installs signal handlers and related interceptors for UBSan standalone.
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//
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//===----------------------------------------------------------------------===//
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#include "ubsan_platform.h"
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#include "sanitizer_common/sanitizer_platform.h"
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#if CAN_SANITIZE_UB
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#include "interception/interception.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "ubsan_diag.h"
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#include "ubsan_init.h"
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// Interception of signals breaks too many things on Android.
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// * It requires that ubsan is the first dependency of the main executable for
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// the interceptors to work correctly. This complicates deployment, as it
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// prevents us from enabling ubsan on random platform modules independently.
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// * For this to work with ART VM, ubsan signal handler has to be set after the
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// debuggerd handler, but before the ART handler.
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// * Interceptors don't work at all when ubsan runtime is loaded late, ex. when
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// it is part of an APK that does not use wrap.sh method.
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#if SANITIZER_FUCHSIA || SANITIZER_ANDROID
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namespace __ubsan {
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void InitializeDeadlySignals() {}
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}
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#else
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#define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
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#include "sanitizer_common/sanitizer_signal_interceptors.inc"
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// TODO(yln): Temporary workaround. Will be removed.
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void ubsan_GetStackTrace(BufferedStackTrace *stack, uptr max_depth,
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uptr pc, uptr bp, void *context, bool fast);
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namespace __ubsan {
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static void OnStackUnwind(const SignalContext &sig, const void *,
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BufferedStackTrace *stack) {
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ubsan_GetStackTrace(stack, kStackTraceMax, sig.pc, sig.bp, sig.context,
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common_flags()->fast_unwind_on_fatal);
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}
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static void UBsanOnDeadlySignal(int signo, void *siginfo, void *context) {
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HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
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}
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static bool is_initialized = false;
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void InitializeDeadlySignals() {
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if (is_initialized)
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return;
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is_initialized = true;
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InitializeSignalInterceptors();
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InstallDeadlySignalHandlers(&UBsanOnDeadlySignal);
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}
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} // namespace __ubsan
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#endif
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#endif // CAN_SANITIZE_UB
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