src/events/SDL_keyboard_c.h
author Sam Lantinga <slouken@libsdl.org>
Mon, 18 Feb 2019 07:50:33 -0800
changeset 12612 07c39cbbeacf
parent 12503 806492103856
permissions -rw-r--r--
Fixed bug 4500 - Heap-Buffer Overflow in Map1toN pertaining to SDL_pixels.c

Petr Pisar

The reproducer has these data in BITMAPINFOHEADER:

biSize = 40
biBitCount = 8
biClrUsed = 131075

SDL_LoadBMP_RW() function passes biBitCount as a color depth to SDL_CreateRGBSurface(), thus 256-color pallete is allocated. But then biClrUsed colors are read from a file and stored into the palette. SDL_LoadBMP_RW should report an error if biClrUsed is greater than 2^biBitCount.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#ifndef SDL_keyboard_c_h_
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#define SDL_keyboard_c_h_
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#include "SDL_keycode.h"
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#include "SDL_events.h"
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/* Initialize the keyboard subsystem */
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extern int SDL_KeyboardInit(void);
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/* Clear the state of the keyboard */
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extern void SDL_ResetKeyboard(void);
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/* Get the default keymap */
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extern void SDL_GetDefaultKeymap(SDL_Keycode * keymap);
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/* Set the mapping of scancode to key codes */
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extern void SDL_SetKeymap(int start, SDL_Keycode * keys, int length);
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/* Set a platform-dependent key name, overriding the default platform-agnostic
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   name. Encoded as UTF-8. The string is not copied, thus the pointer given to
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   this function must stay valid forever (or at least until the call to
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   VideoQuit()). */
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extern void SDL_SetScancodeName(SDL_Scancode scancode, const char *name);
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/* Set the keyboard focus window */
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extern void SDL_SetKeyboardFocus(SDL_Window * window);
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/* Send a keyboard key event */
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extern int SDL_SendKeyboardKey(Uint8 state, SDL_Scancode scancode);
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/* Send keyboard text input */
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extern int SDL_SendKeyboardText(const char *text);
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/* Send editing text for selected range from start to end */
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extern int SDL_SendEditingText(const char *text, int start, int end);
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/* Shutdown the keyboard subsystem */
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extern void SDL_KeyboardQuit(void);
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/* Convert to UTF-8 */
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extern char *SDL_UCS4ToUTF8(Uint32 ch, char *dst);
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/* Toggle on or off pieces of the keyboard mod state. */
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extern void SDL_ToggleModState(const SDL_Keymod modstate, const SDL_bool toggle);
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#endif /* SDL_keyboard_c_h_ */
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/* vi: set ts=4 sw=4 expandtab: */