Qemu 0.9.1 and earlier does not perform range checks for block device read or write requests, which allows guest host users with root privileges to access arbitrary memory and escape the virtual machine. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4037 c046a42c-6fe2-441c-8c8c-71466251a162
152 lines
5.8 KiB
C
152 lines
5.8 KiB
C
/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef BLOCK_INT_H
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#define BLOCK_INT_H
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#include "block.h"
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#define BLOCK_FLAG_ENCRYPT 1
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#define BLOCK_FLAG_COMPRESS 2
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#define BLOCK_FLAG_COMPAT6 4
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struct BlockDriver {
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const char *format_name;
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int instance_size;
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int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
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int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);
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int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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void (*bdrv_close)(BlockDriverState *bs);
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int (*bdrv_create)(const char *filename, int64_t total_sectors,
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const char *backing_file, int flags);
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void (*bdrv_flush)(BlockDriverState *bs);
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int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum);
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int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
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int (*bdrv_make_empty)(BlockDriverState *bs);
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/* aio */
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BlockDriverAIOCB *(*bdrv_aio_read)(BlockDriverState *bs,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *(*bdrv_aio_write)(BlockDriverState *bs,
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int64_t sector_num, const uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
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int aiocb_size;
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const char *protocol_name;
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int (*bdrv_pread)(BlockDriverState *bs, int64_t offset,
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uint8_t *buf, int count);
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int (*bdrv_pwrite)(BlockDriverState *bs, int64_t offset,
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const uint8_t *buf, int count);
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int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
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int64_t (*bdrv_getlength)(BlockDriverState *bs);
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int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int (*bdrv_snapshot_create)(BlockDriverState *bs,
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QEMUSnapshotInfo *sn_info);
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int (*bdrv_snapshot_goto)(BlockDriverState *bs,
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const char *snapshot_id);
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int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
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int (*bdrv_snapshot_list)(BlockDriverState *bs,
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QEMUSnapshotInfo **psn_info);
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int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
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/* removable device specific */
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int (*bdrv_is_inserted)(BlockDriverState *bs);
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int (*bdrv_media_changed)(BlockDriverState *bs);
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int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
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int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
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/* to control generic scsi devices */
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int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
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BlockDriverAIOCB *free_aiocb;
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struct BlockDriver *next;
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};
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struct BlockDriverState {
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int64_t total_sectors; /* if we are reading a disk image, give its
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size in sectors */
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int read_only; /* if true, the media is read only */
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int removable; /* if true, the media can be removed */
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int locked; /* if true, the media cannot temporarily be ejected */
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int encrypted; /* if true, the media is encrypted */
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int sg; /* if true, the device is a /dev/sg* */
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int autogrow; /* if true, the backing store can auto-extend to allocate new extents */
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/* event callback when inserting/removing */
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void (*change_cb)(void *opaque);
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void *change_opaque;
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BlockDriver *drv; /* NULL means no media */
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void *opaque;
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int boot_sector_enabled;
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uint8_t boot_sector_data[512];
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char filename[1024];
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char backing_file[1024]; /* if non zero, the image is a diff of
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this file image */
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int is_temporary;
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int media_changed;
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BlockDriverState *backing_hd;
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/* async read/write emulation */
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void *sync_aiocb;
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/* I/O stats (display with "info blockstats"). */
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uint64_t rd_bytes;
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uint64_t wr_bytes;
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uint64_t rd_ops;
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uint64_t wr_ops;
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/* NOTE: the following infos are only hints for real hardware
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drivers. They are not used by the block driver */
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int cyls, heads, secs, translation;
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int type;
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char device_name[32];
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BlockDriverState *next;
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};
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struct BlockDriverAIOCB {
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BlockDriverState *bs;
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BlockDriverCompletionFunc *cb;
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void *opaque;
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BlockDriverAIOCB *next;
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};
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void get_tmp_filename(char *filename, int size);
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void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
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void *opaque);
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void qemu_aio_release(void *p);
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BlockDriverState *bdrv_first;
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#endif /* BLOCK_INT_H */
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