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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.
22 lines
517 B
C++
22 lines
517 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/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$umask(mode_t mask)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::stdio));
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return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
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auto old_mask = protected_data.umask;
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protected_data.umask = mask & 0777;
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return old_mask;
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});
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}
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}
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