mirror of
https://github.com/RGBCube/serenity
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9a04f53a0f
It's easy to forget the responsibility of validating and safely copying kernel parameters in code that is far away from syscalls. ioctl's are one such example, and bugs there are just as dangerous as at the root syscall level. To avoid this case, utilize the AK::Userspace<T> template in the ioctl kernel interface so that implementors have no choice but to properly validate and copy ioctl pointer arguments.
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
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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#pragma once
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#include <AK/Badge.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/DoubleBuffer.h>
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namespace Kernel {
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class SlavePTY;
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class MasterPTY final : public CharacterDevice {
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public:
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explicit MasterPTY(unsigned index);
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virtual ~MasterPTY() override;
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unsigned index() const { return m_index; }
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String pts_name() const;
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KResultOr<size_t> on_slave_write(const UserOrKernelBuffer&, size_t);
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bool can_write_from_slave() const;
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void notify_slave_closed(Badge<SlavePTY>);
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bool is_closed() const { return m_closed; }
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virtual String absolute_path(const FileDescription&) const override;
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// ^Device
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virtual mode_t required_mode() const override { return 0640; }
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virtual String device_name() const override;
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private:
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// ^CharacterDevice
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual KResult close() override;
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virtual bool is_master_pty() const override { return true; }
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virtual int ioctl(FileDescription&, unsigned request, Userspace<void*> arg) override;
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virtual StringView class_name() const override { return "MasterPTY"; }
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RefPtr<SlavePTY> m_slave;
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unsigned m_index;
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bool m_closed { false };
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DoubleBuffer m_buffer;
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String m_pts_name;
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};
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}
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