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c8d9f1b9c9
Since the CPU already does almost all necessary validation steps for us, we don't really need to attempt to do this. Doing it ourselves doesn't really work very reliably, because we'd have to account for other processors modifying virtual memory, and we'd have to account for e.g. pages not being able to be allocated due to insufficient resources. So change the copy_to/from_user (and associated helper functions) to use the new safe_memcpy, which will return whether it succeeded or not. The only manual validation step needed (which the CPU can't perform for us) is making sure the pointers provided by user mode aren't pointing to kernel mappings. To make it easier to read/write from/to either kernel or user mode data add the UserOrKernelBuffer helper class, which will internally either use copy_from/to_user or directly memcpy, or pass the data through directly using a temporary buffer on the stack. Last but not least we need to keep syscall params trivial as we need to copy them from/to user mode using copy_from/to_user.
93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <Kernel/Console.h>
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#include <Kernel/Devices/KeyboardDevice.h>
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#include <Kernel/TTY/TTY.h>
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#include <LibVT/Terminal.h>
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namespace Kernel {
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static constexpr unsigned s_max_virtual_consoles = 6;
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class VirtualConsole final : public TTY
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, public KeyboardClient
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, public VT::TerminalClient {
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AK_MAKE_ETERNAL
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public:
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VirtualConsole(const unsigned index);
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virtual ~VirtualConsole() override;
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static void switch_to(unsigned);
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static void initialize();
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bool is_graphical() { return m_graphical; }
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void set_graphical(bool graphical);
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private:
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// ^KeyboardClient
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virtual void on_key_pressed(KeyboardDevice::Event) override;
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// ^TTY
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virtual ssize_t on_tty_write(const UserOrKernelBuffer&, ssize_t) override;
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virtual String tty_name() const override { return m_tty_name; }
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virtual void echo(u8) override;
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// ^TerminalClient
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virtual void beep() override;
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virtual void set_window_title(const StringView&) override;
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virtual void set_window_progress(int, int) override;
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virtual void terminal_did_resize(u16 columns, u16 rows) override;
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virtual void terminal_history_changed() override;
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virtual void emit(const u8*, size_t) override;
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// ^CharacterDevice
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virtual const char* class_name() const override { return "VirtualConsole"; }
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void set_active(bool);
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void flush_vga_cursor();
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void flush_dirty_lines();
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unsigned m_index;
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bool m_active { false };
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bool m_graphical { false };
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void clear_vga_row(u16 row);
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void set_vga_start_row(u16 row);
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u16 m_vga_start_row { 0 };
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u16 m_current_vga_start_address { 0 };
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u8* m_current_vga_window { nullptr };
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VT::Terminal m_terminal;
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String m_tty_name;
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};
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}
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