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This ensures that both mutable and immutable access to the protected data of a process is serialized. Note that there may still be multiple TOCTOU issues around this, as we have a bunch of convenience accessors that make it easy to introduce them. We'll need to audit those as well.
35 lines
925 B
C++
35 lines
925 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/KSyms.h>
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#include <Kernel/PerformanceManager.h>
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#include <Kernel/Process.h>
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#include <Kernel/Thread.h>
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namespace Kernel {
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void Process::sys$exit(int status)
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{
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// FIXME: We have callers from kernel which don't acquire the big process lock.
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if (Thread::current()->previous_mode() == Thread::PreviousMode::UserMode) {
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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}
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with_mutable_protected_data([status](auto& protected_data) {
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protected_data.termination_status = status;
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protected_data.termination_signal = 0;
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});
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auto* current_thread = Thread::current();
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current_thread->set_profiling_suppressed();
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PerformanceManager::add_thread_exit_event(*current_thread);
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die();
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current_thread->die_if_needed();
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VERIFY_NOT_REACHED();
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}
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}
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