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e87eac9273
This achieves two things: - Programs can now intentionally perform arbitrary syscalls by calling syscall(). This allows us to work on things like syscall fuzzing. - It restricts the ability of userspace to make syscalls to a single 4KB page of code. In order to call the kernel directly, an attacker must now locate this page and call through it.
128 lines
4.6 KiB
C++
128 lines
4.6 KiB
C++
/*
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* Copyright (c) 2020, Hüseyin Aslıtürk <asliturk@hotmail.com>
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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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#include "CharacterMap.h"
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#include <AK/StringBuilder.h>
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#include <LibKeyboard/CharacterMapFile.h>
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#ifndef KERNEL
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# include <serenity.h>
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#endif
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namespace Keyboard {
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#ifndef KERNEL
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// The Kernel explicitly and exclusively links only this file into it.
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// Thus, we cannot even include a reference to the symbol `CharacterMapFile::load_from_file`.
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Optional<CharacterMap> CharacterMap::load_from_file(const String& map_name)
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{
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auto result = CharacterMapFile::load_from_file(map_name);
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if (!result.has_value())
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return {};
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return CharacterMap(map_name, result.value());
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}
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#endif
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CharacterMap::CharacterMap(const String& map_name, const CharacterMapData& map_data)
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: m_character_map_data(map_data)
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, m_character_map_name(map_name)
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{
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}
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#ifndef KERNEL
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int CharacterMap::set_system_map()
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{
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return setkeymap(m_character_map_name.characters(), m_character_map_data.map, m_character_map_data.shift_map, m_character_map_data.alt_map, m_character_map_data.altgr_map, m_character_map_data.shift_altgr_map);
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}
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Result<CharacterMap, OSError> CharacterMap::fetch_system_map()
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{
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CharacterMapData map_data;
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char keymap_name[50 + 1] = { 0 };
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if (getkeymap(keymap_name, sizeof(keymap_name), map_data.map, map_data.shift_map, map_data.alt_map, map_data.altgr_map, map_data.shift_altgr_map) < 0) {
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return OSError(errno);
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}
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return CharacterMap { keymap_name, map_data };
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}
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#endif
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u32 CharacterMap::get_char(KeyEvent event)
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{
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auto modifiers = event.modifiers();
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auto index = event.scancode & 0xFF; // Index is last byte of scan code.
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auto caps_lock_on = event.caps_lock_on;
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u32 code_point;
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if (modifiers & Mod_Alt)
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code_point = m_character_map_data.alt_map[index];
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else if ((modifiers & Mod_Shift) && (modifiers & Mod_AltGr))
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code_point = m_character_map_data.shift_altgr_map[index];
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else if (modifiers & Mod_Shift)
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code_point = m_character_map_data.shift_map[index];
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else if (modifiers & Mod_AltGr)
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code_point = m_character_map_data.altgr_map[index];
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else
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code_point = m_character_map_data.map[index];
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if (caps_lock_on && (modifiers == 0 || modifiers == Mod_Shift)) {
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if (code_point >= 'a' && code_point <= 'z')
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code_point &= ~0x20;
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else if (code_point >= 'A' && code_point <= 'Z')
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code_point |= 0x20;
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}
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if (event.e0_prefix && event.key == Key_Slash) {
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// If Key_Slash (scancode = 0x35) mapped to other form "/", we fix num pad key of "/" with this case.
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code_point = '/';
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} else if (event.e0_prefix && event.key != Key_Return) {
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// Except for `keypad-/` and 'keypad-return', all e0 scan codes are not actually characters. i.e., `keypad-0` and
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// `Insert` have the same scancode except for the prefix, but insert should not have a code_point.
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code_point = 0;
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}
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return code_point;
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}
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void CharacterMap::set_character_map_data(CharacterMapData character_map_data)
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{
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m_character_map_data = character_map_data;
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}
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void CharacterMap::set_character_map_name(const String& character_map_name)
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{
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m_character_map_name = character_map_name;
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}
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const String CharacterMap::character_map_name()
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{
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return m_character_map_name;
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}
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}
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