b42e8b4dec
The new option is named check_unreachable_on_signal. It is meant to duplicate dumpsys meminfo --unreachable <PID> for non-java processes. When enabled, a user can send a signal to a process which will trigger the unreachable check on the next allocation call. Added new unit tests. Test: New unit tests pass. Test: Enabled for the entire system, then dumped on the netd Test: process and also system_server. Change-Id: I73561b408a947a11ce21a211b065d59fcc39097b
80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <atomic>
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#include <string>
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#include <memunreachable/memunreachable.h>
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#include <platform/bionic/macros.h>
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#include "Config.h"
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#include "Unreachable.h"
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#include "debug_log.h"
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std::atomic_bool Unreachable::do_check_;
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static void EnableUnreachableCheck(int, struct siginfo*, void*) {
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Unreachable::EnableCheck();
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}
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void Unreachable::CheckIfRequested(const Config& config) {
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if ((config.options() & CHECK_UNREACHABLE_ON_SIGNAL) && do_check_.exchange(false)) {
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info_log("Starting to check for unreachable memory.");
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if (!LogUnreachableMemory(false, 100)) {
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error_log("Unreachable check failed, run setenforce 0 and try again.");
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}
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}
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}
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bool Unreachable::Initialize(const Config& config) {
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if (!(config.options() & CHECK_UNREACHABLE_ON_SIGNAL)) {
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return true;
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}
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struct sigaction64 unreachable_act = {};
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unreachable_act.sa_sigaction = EnableUnreachableCheck;
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unreachable_act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
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if (sigaction64(config.check_unreachable_signal(), &unreachable_act, nullptr) != 0) {
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error_log("Unable to set up check unreachable signal function: %s", strerror(errno));
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return false;
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}
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if (config.options() & VERBOSE) {
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info_log("%s: Run: 'kill -%d %d' to check for unreachable memory.", getprogname(),
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config.check_unreachable_signal(), getpid());
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}
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return true;
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}
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