80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
// Copyright 2020 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/linux/initial_signal_dispositions.h"
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#include <android/api-level.h>
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#include <signal.h>
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#include "base/logging.h"
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#include "build/build_config.h"
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namespace crashpad {
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#if __ANDROID_API__ <= 23
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namespace {
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bool LoggingSignal(int signum, sighandler_t handler) {
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sighandler_t previous = signal(signum, handler);
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PLOG_IF(ERROR, previous == SIG_ERR) << "signal " << signum;
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return previous != SIG_ERR;
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}
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} // namespace
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#endif // __ANDROID_API__ <= 23
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bool InitializeSignalDispositions() {
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#if __ANDROID_API__ <= 23
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const int api_level = android_get_device_api_level();
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if (api_level < 0) {
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LOG(WARNING) << "bad api level";
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return false;
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}
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// Bionic installs signal handlers which request crash dumps from Android's
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// debuggerd, but there are errors in how signals which aren't automatically
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// re-raised are handled on Marshmallow (API 23).
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//
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// Before requesting a dump, Bionic acquires a lock to communicate with
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// debuggerd and expecting imminent death, never releases it.
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//
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// While handling the dump request, debuggerd allows the dying process to
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// continue before ptrace-detaching it. So, when Bionic manually re-raises a
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// signal, it is intercepted by debuggerd and the dying process is allowed to
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// live.
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//
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// Bionic restores SIG_DFL for the signal it's just handled, but if a
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// different crash signal is later recieved, Bionic attempts to reacquire the
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// lock to communicate with debuggerd and blocks forever.
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//
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// Disable Bionic's signal handlers for these signals on Marshmallow.
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bool success = true;
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if (api_level == 23) {
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success = LoggingSignal(SIGABRT, SIG_DFL);
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success = LoggingSignal(SIGFPE, SIG_DFL) && success;
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success = LoggingSignal(SIGPIPE, SIG_DFL) && success;
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#if defined(SIGSTKFLT)
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success = LoggingSignal(SIGSTKFLT, SIG_DFL) && success;
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#endif
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success = LoggingSignal(SIGTRAP, SIG_DFL) && success;
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}
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return success;
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#else
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return true;
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#endif // __ANDROID_API__ <= 23
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}
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} // namespace crashpad
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