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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.
26 lines
612 B
C++
26 lines
612 B
C++
/*
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* Copyright (c) 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/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$disown(ProcessID pid)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::proc));
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auto process = Process::from_pid(pid);
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if (!process)
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return ESRCH;
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if (process->ppid() != this->pid())
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return ECHILD;
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process->with_mutable_protected_data([](auto& protected_data) {
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protected_data.ppid = 0;
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});
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process->disowned_by_waiter(*this);
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return 0;
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}
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}
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