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Currently if a program calls sigaction very early (before non-lazy sanitizer initialization, in particular if .preinit_array initialization is not enabled), then sigaction will wrongly fail since the interceptor is not initialized yet. In all other interceptors we do lazy runtime initialization for this reason, but we don't do it in the signal interceptors. Do lazy runtime initialization in signal interceptors as well. Reviewed By: melver Differential Revision: https://reviews.llvm.org/D155188
77 lines
2.6 KiB
C++
77 lines
2.6 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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namespace __ubsan {
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void InitializeDeadlySignals();
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} // namespace __ubsan
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#define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
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#define SIGNAL_INTERCEPTOR_ENTER() __ubsan::InitializeDeadlySignals()
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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,
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StackTrace::GetNextInstructionPc(sig.pc), sig.bp,
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sig.context, 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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