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Bionic installs signal handlers which request crash dumps from Android's debuggerd, but there are errors in how signals which aren't automatically re-raised are handled on Marshmallow (API 23). Before requesting a dump, Bionic acquires a lock to communicate with debuggerd and expecting imminent death, never releases it. While handling the dump request, debuggerd allows the dying process to continue before ptrace-detaching it. So, when Bionic manually re-raises a signal, it is intercepted by debuggerd and the dying process is allowed to live. Bionic restores SIG_DFL for the signal it's just handled, but if a different crash signal is later recieved, Bionic attempts to reacquire the lock to communicate with debuggerd and blocks forever. Disable Bionic's signal handlers for these signals on Marshmallow. Bug: chromium:1050178 Change-Id: Ia1fc5a24161a95931684d092ba8fee2f0dfbbdbb Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2134513 Reviewed-by: Mark Mentovai <mark@chromium.org>
42 lines
1.8 KiB
C++
42 lines
1.8 KiB
C++
// Copyright 2020 The Crashpad Authors. All rights reserved.
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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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#ifndef CRASHPAD_UTIL_LINUX_INITIAL_SIGNAL_DISPOSITIONS_H
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#define CRASHPAD_UTIL_LINUX_INITIAL_SIGNAL_DISPOSITIONS_H
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namespace crashpad {
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//! \brief Establishes signal dispositions for a process based on the platform.
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//!
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//! Default signal dispositions are normally configured by the kernel, but
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//! additional signal handlers might be installed by dependent or preloaded
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//! libraries, e.g. Bionic normally installs signal handlers which log stack
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//! traces to Android's logcat.
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//!
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//! This function initializes signal dispositions when the default dispositions
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//! provided by the platform are broken. This function must be called before any
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//! application level signal handlers have been installed and should be called
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//! early in the process lifetime to reduce the chance of any broken signal
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//! handlers being triggered.
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//!
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//! When running on Android M (API 23), this function installs `SIG_DFL` for
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//! signals: `SIGABRT`, `SIGFPE`, `SIGPIPE`, `SIGSTKFLT`, and `SIGTRAP`.
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//!
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//! \return `true` on success. Otherwise `false` with a message logged.
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bool InitializeSignalDispositions();
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_LINUX_INITIAL_SIGNAL_DISPOSITIONS_H
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