mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 15:48:12 +00:00
c05c5a7ff4
Found due to smelly code in InodeFile::absolute_path. In particular, this replaces the following misleading methods: File::absolute_path This method *never* returns an actual path, and if called on an InodeFile (which is impossible), it would VERIFY_NOT_REACHED(). OpenFileDescription::try_serialize_absolute_path OpenFileDescription::absolute_path These methods do not guarantee to return an actual path (just like the other method), and just like Custody::absolute_path they do not guarantee accuracy. In particular, just renaming the method made a TOCTOU bug obvious. The new method signatures use KResultOr, just like try_serialize_absolute_path() already did.
97 lines
2.9 KiB
C++
97 lines
2.9 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/CircularDeque.h>
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#include <AK/WeakPtr.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/DoubleBuffer.h>
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#include <Kernel/ProcessGroup.h>
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#include <Kernel/UnixTypes.h>
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#define TTY_BUFFER_SIZE 1024
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namespace Kernel {
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class TTY : public CharacterDevice {
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public:
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virtual ~TTY() override;
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virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual bool can_write(const OpenFileDescription&, size_t) const override;
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virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override final;
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virtual KResultOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const override;
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virtual String const& tty_name() const = 0;
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unsigned short rows() const { return m_rows; }
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unsigned short columns() const { return m_columns; }
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ProcessGroupID pgid() const
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{
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if (auto pg = m_pg.strong_ref())
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return pg->pgid();
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return 0;
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}
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KResult set_termios(const termios&);
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bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
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bool should_flush_on_signal() const { return !(m_termios.c_lflag & NOFLSH); }
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bool should_echo_input() const { return m_termios.c_lflag & ECHO; }
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bool in_canonical_mode() const { return m_termios.c_lflag & ICANON; }
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void set_default_termios();
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void hang_up();
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protected:
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virtual KResultOr<size_t> on_tty_write(const UserOrKernelBuffer&, size_t) = 0;
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void set_size(unsigned short columns, unsigned short rows);
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TTY(unsigned major, unsigned minor);
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void emit(u8, bool do_evaluate_block_conditions = false);
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void echo_with_processing(u8);
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bool can_do_backspace() const;
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void do_backspace();
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void erase_word();
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void erase_character();
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void kill_line();
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void flush_input();
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bool is_eol(u8) const;
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bool is_eof(u8) const;
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bool is_kill(u8) const;
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bool is_erase(u8) const;
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bool is_werase(u8) const;
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void generate_signal(int signal);
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int m_available_lines { 0 };
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private:
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// ^CharacterDevice
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virtual bool is_tty() const final override { return true; }
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virtual void echo(u8) = 0;
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template<typename Functor>
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void process_output(u8, Functor put_char);
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CircularDeque<u8, TTY_BUFFER_SIZE> m_input_buffer;
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// FIXME: use something like AK::Bitmap but which takes a size template parameter
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u8 m_special_character_bitmask[TTY_BUFFER_SIZE / 8];
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WeakPtr<Process> m_original_process_parent;
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WeakPtr<ProcessGroup> m_pg;
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termios m_termios;
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unsigned short m_rows { 0 };
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unsigned short m_columns { 0 };
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};
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}
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