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xemu/ui/vnc.h
Stefan Weil 23bfe28fff vnc: Fix stack corruption and other bitmap related bugs 
Commit bc2429b917 introduced
a severe bug (stack corruption).

bitmap_clear was called with a wrong argument
which caused out-of-bound writes to the local variable width_mask.

This bug was detected with QEMU running on windows.
It also occurs with wine:

*** stack smashing detected ***:  terminated
wine: Unhandled illegal instruction at address 0x6115c7 (thread 0009), starting debugger...

The bug is not windows specific!

Instead of fixing the wrong parameter value, bitmap_clear(), bitmap_set
and width_mask were removed, and bitmap_intersect() was replaced by
!bitmap_empty(). The new operation is much shorter and equivalent to
the old operations.

The declarations of the dirty bitmaps in vnc.h were also wrong for 64 bit
hosts because of a rounding effect: for these hosts, VNC_MAX_WIDTH is no
longer a multiple of (16 * BITS_PER_LONG), so the rounded value of
VNC_DIRTY_WORDS was too small.

Fix both declarations by using the macro which is designed for this
purpose.

Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Gerhard Wiesinger <lists@wiesinger.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-03-10 16:12:25 -06:00

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/*
* QEMU VNC display driver
*
* Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
* Copyright (C) 2006 Fabrice Bellard
* Copyright (C) 2009 Red Hat, Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef __QEMU_VNC_H
#define __QEMU_VNC_H
#include "qemu-common.h"
#include "qemu-queue.h"
#ifdef CONFIG_VNC_THREAD
#include "qemu-thread.h"
#endif
#include "console.h"
#include "monitor.h"
#include "audio/audio.h"
#include "bitmap.h"
#include <zlib.h>
#include <stdbool.h>
#include "keymaps.h"
#include "vnc-palette.h"
#include "vnc-enc-zrle.h"
// #define _VNC_DEBUG 1
#ifdef _VNC_DEBUG
#define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define VNC_DEBUG(fmt, ...) do { } while (0)
#endif
/*****************************************************************************
*
* Core data structures
*
*****************************************************************************/
typedef struct Buffer
{
size_t capacity;
size_t offset;
uint8_t *buffer;
} Buffer;
typedef struct VncState VncState;
typedef struct VncJob VncJob;
typedef struct VncRect VncRect;
typedef struct VncRectEntry VncRectEntry;
typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
typedef void VncWritePixels(VncState *vs, struct PixelFormat *pf, void *data, int size);
typedef void VncSendHextileTile(VncState *vs,
int x, int y, int w, int h,
void *last_bg,
void *last_fg,
int *has_bg, int *has_fg);
/* VNC_MAX_WIDTH must be a multiple of 16. */
#define VNC_MAX_WIDTH 2560
#define VNC_MAX_HEIGHT 2048
/* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
#define VNC_DIRTY_BITS (VNC_MAX_WIDTH / 16)
#define VNC_STAT_RECT 64
#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
#define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
#define VNC_AUTH_CHALLENGE_SIZE 16
typedef struct VncDisplay VncDisplay;
#ifdef CONFIG_VNC_TLS
#include "vnc-tls.h"
#include "vnc-auth-vencrypt.h"
#endif
#ifdef CONFIG_VNC_SASL
#include "vnc-auth-sasl.h"
#endif
struct VncRectStat
{
/* time of last 10 updates, to find update frequency */
struct timeval times[10];
int idx;
double freq; /* Update frequency (in Hz) */
bool updated; /* Already updated during this refresh */
};
typedef struct VncRectStat VncRectStat;
struct VncSurface
{
struct timeval last_freq_check;
DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_MAX_WIDTH / 16);
VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
DisplaySurface *ds;
};
struct VncDisplay
{
QTAILQ_HEAD(, VncState) clients;
QEMUTimer *timer;
int timer_interval;
int lsock;
DisplayState *ds;
kbd_layout_t *kbd_layout;
int lock_key_sync;
#ifdef CONFIG_VNC_THREAD
QemuMutex mutex;
#endif
QEMUCursor *cursor;
int cursor_msize;
uint8_t *cursor_mask;
struct VncSurface guest; /* guest visible surface (aka ds->surface) */
DisplaySurface *server; /* vnc server surface */
char *display;
char *password;
time_t expires;
int auth;
bool lossy;
bool non_adaptive;
#ifdef CONFIG_VNC_TLS
int subauth; /* Used by VeNCrypt */
VncDisplayTLS tls;
#endif
#ifdef CONFIG_VNC_SASL
VncDisplaySASL sasl;
#endif
};
typedef struct VncTight {
int type;
uint8_t quality;
uint8_t compression;
uint8_t pixel24;
Buffer tight;
Buffer tmp;
Buffer zlib;
Buffer gradient;
#ifdef CONFIG_VNC_JPEG
Buffer jpeg;
#endif
#ifdef CONFIG_VNC_PNG
Buffer png;
#endif
int levels[4];
z_stream stream[4];
} VncTight;
typedef struct VncHextile {
VncSendHextileTile *send_tile;
} VncHextile;
typedef struct VncZlib {
Buffer zlib;
Buffer tmp;
z_stream stream;
int level;
} VncZlib;
typedef struct VncZrle {
int type;
Buffer fb;
Buffer zrle;
Buffer tmp;
Buffer zlib;
z_stream stream;
VncPalette palette;
} VncZrle;
typedef struct VncZywrle {
int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
} VncZywrle;
#ifdef CONFIG_VNC_THREAD
struct VncRect
{
int x;
int y;
int w;
int h;
};
struct VncRectEntry
{
struct VncRect rect;
QLIST_ENTRY(VncRectEntry) next;
};
struct VncJob
{
VncState *vs;
QLIST_HEAD(, VncRectEntry) rectangles;
QTAILQ_ENTRY(VncJob) next;
};
#else
struct VncJob
{
VncState *vs;
int rectangles;
size_t saved_offset;
};
#endif
struct VncState
{
int csock;
DisplayState *ds;
DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
* vnc-jobs-async.c */
VncDisplay *vd;
int need_update;
int force_update;
uint32_t features;
int absolute;
int last_x;
int last_y;
int client_width;
int client_height;
uint32_t vnc_encoding;
int major;
int minor;
char challenge[VNC_AUTH_CHALLENGE_SIZE];
#ifdef CONFIG_VNC_TLS
VncStateTLS tls;
#endif
#ifdef CONFIG_VNC_SASL
VncStateSASL sasl;
#endif
QObject *info;
Buffer output;
Buffer input;
/* current output mode information */
VncWritePixels *write_pixels;
DisplaySurface clientds;
CaptureVoiceOut *audio_cap;
struct audsettings as;
VncReadEvent *read_handler;
size_t read_handler_expect;
/* input */
uint8_t modifiers_state[256];
QEMUPutLEDEntry *led;
bool abort;
#ifndef CONFIG_VNC_THREAD
VncJob job;
#else
QemuMutex output_mutex;
#endif
/* Encoding specific, if you add something here, don't forget to
* update vnc_async_encoding_start()
*/
VncTight tight;
VncZlib zlib;
VncHextile hextile;
VncZrle zrle;
VncZywrle zywrle;
Notifier mouse_mode_notifier;
QTAILQ_ENTRY(VncState) next;
};
/*****************************************************************************
*
* Authentication modes
*
*****************************************************************************/
enum {
VNC_AUTH_INVALID = 0,
VNC_AUTH_NONE = 1,
VNC_AUTH_VNC = 2,
VNC_AUTH_RA2 = 5,
VNC_AUTH_RA2NE = 6,
VNC_AUTH_TIGHT = 16,
VNC_AUTH_ULTRA = 17,
VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */
VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */
};
enum {
VNC_AUTH_VENCRYPT_PLAIN = 256,
VNC_AUTH_VENCRYPT_TLSNONE = 257,
VNC_AUTH_VENCRYPT_TLSVNC = 258,
VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
VNC_AUTH_VENCRYPT_X509NONE = 260,
VNC_AUTH_VENCRYPT_X509VNC = 261,
VNC_AUTH_VENCRYPT_X509PLAIN = 262,
VNC_AUTH_VENCRYPT_X509SASL = 263,
VNC_AUTH_VENCRYPT_TLSSASL = 264,
};
/*****************************************************************************
*
* Encoding types
*
*****************************************************************************/
#define VNC_ENCODING_RAW 0x00000000
#define VNC_ENCODING_COPYRECT 0x00000001
#define VNC_ENCODING_RRE 0x00000002
#define VNC_ENCODING_CORRE 0x00000004
#define VNC_ENCODING_HEXTILE 0x00000005
#define VNC_ENCODING_ZLIB 0x00000006
#define VNC_ENCODING_TIGHT 0x00000007
#define VNC_ENCODING_ZLIBHEX 0x00000008
#define VNC_ENCODING_TRLE 0x0000000f
#define VNC_ENCODING_ZRLE 0x00000010
#define VNC_ENCODING_ZYWRLE 0x00000011
#define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */
#define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */
#define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */
#define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */
#define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */
#define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */
#define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */
#define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */
#define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */
#define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */
#define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */
#define VNC_ENCODING_WMVi 0x574D5669
/*****************************************************************************
*
* Other tight constants
*
*****************************************************************************/
/*
* Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
*/
#define VNC_TIGHT_CCB_RESET_MASK (0x0f)
#define VNC_TIGHT_CCB_TYPE_MASK (0x0f << 4)
#define VNC_TIGHT_CCB_TYPE_FILL (0x08 << 4)
#define VNC_TIGHT_CCB_TYPE_JPEG (0x09 << 4)
#define VNC_TIGHT_CCB_TYPE_PNG (0x0A << 4)
#define VNC_TIGHT_CCB_BASIC_MAX (0x07 << 4)
#define VNC_TIGHT_CCB_BASIC_ZLIB (0x03 << 4)
#define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
/*****************************************************************************
*
* Features
*
*****************************************************************************/
#define VNC_FEATURE_RESIZE 0
#define VNC_FEATURE_HEXTILE 1
#define VNC_FEATURE_POINTER_TYPE_CHANGE 2
#define VNC_FEATURE_WMVI 3
#define VNC_FEATURE_TIGHT 4
#define VNC_FEATURE_ZLIB 5
#define VNC_FEATURE_COPYRECT 6
#define VNC_FEATURE_RICH_CURSOR 7
#define VNC_FEATURE_TIGHT_PNG 8
#define VNC_FEATURE_ZRLE 9
#define VNC_FEATURE_ZYWRLE 10
#define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE)
#define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE)
#define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
#define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI)
#define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT)
#define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB)
#define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT)
#define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR)
#define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG)
#define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE)
#define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE)
/* Client -> Server message IDs */
#define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0
#define VNC_MSG_CLIENT_SET_ENCODINGS 2
#define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
#define VNC_MSG_CLIENT_KEY_EVENT 4
#define VNC_MSG_CLIENT_POINTER_EVENT 5
#define VNC_MSG_CLIENT_CUT_TEXT 6
#define VNC_MSG_CLIENT_VMWARE_0 127
#define VNC_MSG_CLIENT_CALL_CONTROL 249
#define VNC_MSG_CLIENT_XVP 250
#define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251
#define VNC_MSG_CLIENT_TIGHT 252
#define VNC_MSG_CLIENT_GII 253
#define VNC_MSG_CLIENT_VMWARE_1 254
#define VNC_MSG_CLIENT_QEMU 255
/* Server -> Client message IDs */
#define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0
#define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1
#define VNC_MSG_SERVER_BELL 2
#define VNC_MSG_SERVER_CUT_TEXT 3
#define VNC_MSG_SERVER_VMWARE_0 127
#define VNC_MSG_SERVER_CALL_CONTROL 249
#define VNC_MSG_SERVER_XVP 250
#define VNC_MSG_SERVER_TIGHT 252
#define VNC_MSG_SERVER_GII 253
#define VNC_MSG_SERVER_VMWARE_1 254
#define VNC_MSG_SERVER_QEMU 255
/* QEMU client -> server message IDs */
#define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0
#define VNC_MSG_CLIENT_QEMU_AUDIO 1
/* QEMU server -> client message IDs */
#define VNC_MSG_SERVER_QEMU_AUDIO 1
/* QEMU client -> server audio message IDs */
#define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0
#define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1
#define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2
/* QEMU server -> client audio message IDs */
#define VNC_MSG_SERVER_QEMU_AUDIO_END 0
#define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1
#define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2
/*****************************************************************************
*
* Internal APIs
*
*****************************************************************************/
/* Event loop functions */
void vnc_client_read(void *opaque);
void vnc_client_write(void *opaque);
long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
/* Protocol I/O functions */
void vnc_write(VncState *vs, const void *data, size_t len);
void vnc_write_u32(VncState *vs, uint32_t value);
void vnc_write_s32(VncState *vs, int32_t value);
void vnc_write_u16(VncState *vs, uint16_t value);
void vnc_write_u8(VncState *vs, uint8_t value);
void vnc_flush(VncState *vs);
void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
/* Buffer I/O functions */
uint8_t read_u8(uint8_t *data, size_t offset);
uint16_t read_u16(uint8_t *data, size_t offset);
int32_t read_s32(uint8_t *data, size_t offset);
uint32_t read_u32(uint8_t *data, size_t offset);
/* Protocol stage functions */
void vnc_client_error(VncState *vs);
int vnc_client_io_error(VncState *vs, int ret, int last_errno);
void start_client_init(VncState *vs);
void start_auth_vnc(VncState *vs);
/* Buffer management */
void buffer_reserve(Buffer *buffer, size_t len);
int buffer_empty(Buffer *buffer);
uint8_t *buffer_end(Buffer *buffer);
void buffer_reset(Buffer *buffer);
void buffer_free(Buffer *buffer);
void buffer_append(Buffer *buffer, const void *data, size_t len);
/* Misc helpers */
char *vnc_socket_local_addr(const char *format, int fd);
char *vnc_socket_remote_addr(const char *format, int fd);
static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
return (vs->features & (1 << feature));
}
/* Framebuffer */
void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
int32_t encoding);
void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
/* Encodings */
int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
int y, int w, int h);
void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
void vnc_zlib_zfree(void *x, void *addr);
int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
void vnc_zlib_clear(VncState *vs);
int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
int w, int h);
void vnc_tight_clear(VncState *vs);
int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
void vnc_zrle_clear(VncState *vs);
#endif /* __QEMU_VNC_H */
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