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24bb8fb99a
Use msecs_to_jiffies() and jiffies_to_msecs() in scsi_ioctl(). Sometimes callers use very large values for e.g. vendor specific media clear command and calculation can overflow. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
680 lines
17 KiB
C
680 lines
17 KiB
C
/*
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* Copyright (C) 2001 Jens Axboe <axboe@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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*
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public Licens
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/capability.h>
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#include <linux/completion.h>
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#include <linux/cdrom.h>
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#include <linux/slab.h>
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#include <linux/times.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsi_cmnd.h>
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/* Command group 3 is reserved and should never be used. */
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const unsigned char scsi_command_size[8] =
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{
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6, 10, 10, 12,
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16, 12, 10, 10
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};
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EXPORT_SYMBOL(scsi_command_size);
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#include <scsi/sg.h>
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static int sg_get_version(int __user *p)
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{
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static const int sg_version_num = 30527;
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return put_user(sg_version_num, p);
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}
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static int scsi_get_idlun(struct request_queue *q, int __user *p)
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{
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return put_user(0, p);
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}
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static int scsi_get_bus(struct request_queue *q, int __user *p)
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{
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return put_user(0, p);
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}
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static int sg_get_timeout(struct request_queue *q)
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{
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return q->sg_timeout / (HZ / USER_HZ);
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}
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static int sg_set_timeout(struct request_queue *q, int __user *p)
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{
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int timeout, err = get_user(timeout, p);
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if (!err)
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q->sg_timeout = timeout * (HZ / USER_HZ);
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return err;
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}
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static int sg_get_reserved_size(struct request_queue *q, int __user *p)
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{
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unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
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return put_user(val, p);
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}
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static int sg_set_reserved_size(struct request_queue *q, int __user *p)
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{
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int size, err = get_user(size, p);
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if (err)
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return err;
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if (size < 0)
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return -EINVAL;
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if (size > (q->max_sectors << 9))
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size = q->max_sectors << 9;
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q->sg_reserved_size = size;
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return 0;
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}
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/*
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* will always return that we are ATAPI even for a real SCSI drive, I'm not
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* so sure this is worth doing anything about (why would you care??)
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*/
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static int sg_emulated_host(struct request_queue *q, int __user *p)
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{
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return put_user(1, p);
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}
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#define CMD_READ_SAFE 0x01
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#define CMD_WRITE_SAFE 0x02
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#define CMD_WARNED 0x04
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#define safe_for_read(cmd) [cmd] = CMD_READ_SAFE
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#define safe_for_write(cmd) [cmd] = CMD_WRITE_SAFE
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int blk_verify_command(unsigned char *cmd, int has_write_perm)
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{
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static unsigned char cmd_type[256] = {
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/* Basic read-only commands */
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safe_for_read(TEST_UNIT_READY),
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safe_for_read(REQUEST_SENSE),
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safe_for_read(READ_6),
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safe_for_read(READ_10),
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safe_for_read(READ_12),
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safe_for_read(READ_16),
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safe_for_read(READ_BUFFER),
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safe_for_read(READ_DEFECT_DATA),
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safe_for_read(READ_LONG),
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safe_for_read(INQUIRY),
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safe_for_read(MODE_SENSE),
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safe_for_read(MODE_SENSE_10),
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safe_for_read(LOG_SENSE),
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safe_for_read(START_STOP),
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safe_for_read(GPCMD_VERIFY_10),
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safe_for_read(VERIFY_16),
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/* Audio CD commands */
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safe_for_read(GPCMD_PLAY_CD),
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safe_for_read(GPCMD_PLAY_AUDIO_10),
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safe_for_read(GPCMD_PLAY_AUDIO_MSF),
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safe_for_read(GPCMD_PLAY_AUDIO_TI),
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safe_for_read(GPCMD_PAUSE_RESUME),
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/* CD/DVD data reading */
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safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
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safe_for_read(GPCMD_READ_CD),
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safe_for_read(GPCMD_READ_CD_MSF),
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safe_for_read(GPCMD_READ_DISC_INFO),
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safe_for_read(GPCMD_READ_CDVD_CAPACITY),
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safe_for_read(GPCMD_READ_DVD_STRUCTURE),
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safe_for_read(GPCMD_READ_HEADER),
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safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
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safe_for_read(GPCMD_READ_SUBCHANNEL),
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safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
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safe_for_read(GPCMD_REPORT_KEY),
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safe_for_read(GPCMD_SCAN),
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safe_for_read(GPCMD_GET_CONFIGURATION),
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safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
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safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
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safe_for_read(GPCMD_GET_PERFORMANCE),
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safe_for_read(GPCMD_SEEK),
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safe_for_read(GPCMD_STOP_PLAY_SCAN),
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/* Basic writing commands */
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safe_for_write(WRITE_6),
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safe_for_write(WRITE_10),
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safe_for_write(WRITE_VERIFY),
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safe_for_write(WRITE_12),
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safe_for_write(WRITE_VERIFY_12),
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safe_for_write(WRITE_16),
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safe_for_write(WRITE_LONG),
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safe_for_write(WRITE_LONG_2),
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safe_for_write(ERASE),
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safe_for_write(GPCMD_MODE_SELECT_10),
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safe_for_write(MODE_SELECT),
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safe_for_write(LOG_SELECT),
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safe_for_write(GPCMD_BLANK),
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safe_for_write(GPCMD_CLOSE_TRACK),
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safe_for_write(GPCMD_FLUSH_CACHE),
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safe_for_write(GPCMD_FORMAT_UNIT),
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safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
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safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
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safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
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safe_for_write(GPCMD_SEND_EVENT),
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safe_for_write(GPCMD_SEND_KEY),
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safe_for_write(GPCMD_SEND_OPC),
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safe_for_write(GPCMD_SEND_CUE_SHEET),
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safe_for_write(GPCMD_SET_SPEED),
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safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
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safe_for_write(GPCMD_LOAD_UNLOAD),
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safe_for_write(GPCMD_SET_STREAMING),
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};
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unsigned char type = cmd_type[cmd[0]];
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/* Anybody who can open the device can do a read-safe command */
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if (type & CMD_READ_SAFE)
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return 0;
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/* Write-safe commands just require a writable open.. */
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if ((type & CMD_WRITE_SAFE) && has_write_perm)
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return 0;
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/* And root can do any command.. */
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if (capable(CAP_SYS_RAWIO))
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return 0;
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if (!type) {
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cmd_type[cmd[0]] = CMD_WARNED;
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printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
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}
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/* Otherwise fail it with an "Operation not permitted" */
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return -EPERM;
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}
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EXPORT_SYMBOL_GPL(blk_verify_command);
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static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
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struct sg_io_hdr *hdr, int has_write_perm)
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{
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memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
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if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
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return -EFAULT;
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if (blk_verify_command(rq->cmd, has_write_perm))
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return -EPERM;
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/*
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* fill in request structure
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*/
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rq->cmd_len = hdr->cmd_len;
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rq->cmd_type = REQ_TYPE_BLOCK_PC;
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rq->timeout = msecs_to_jiffies(hdr->timeout);
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if (!rq->timeout)
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rq->timeout = q->sg_timeout;
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if (!rq->timeout)
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rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
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return 0;
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}
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/*
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* unmap a request that was previously mapped to this sg_io_hdr. handles
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* both sg and non-sg sg_io_hdr.
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*/
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static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
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{
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blk_rq_unmap_user(rq->bio);
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blk_put_request(rq);
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return 0;
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}
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static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
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struct bio *bio)
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{
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int r, ret = 0;
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/*
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* fill in all the output members
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*/
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hdr->status = rq->errors & 0xff;
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hdr->masked_status = status_byte(rq->errors);
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hdr->msg_status = msg_byte(rq->errors);
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hdr->host_status = host_byte(rq->errors);
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hdr->driver_status = driver_byte(rq->errors);
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hdr->info = 0;
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if (hdr->masked_status || hdr->host_status || hdr->driver_status)
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hdr->info |= SG_INFO_CHECK;
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hdr->resid = rq->data_len;
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hdr->sb_len_wr = 0;
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if (rq->sense_len && hdr->sbp) {
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int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
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if (!copy_to_user(hdr->sbp, rq->sense, len))
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hdr->sb_len_wr = len;
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else
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ret = -EFAULT;
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}
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rq->bio = bio;
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r = blk_unmap_sghdr_rq(rq, hdr);
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if (ret)
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r = ret;
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return r;
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}
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static int sg_io(struct file *file, struct request_queue *q,
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struct gendisk *bd_disk, struct sg_io_hdr *hdr)
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{
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unsigned long start_time;
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int writing = 0, ret = 0, has_write_perm = 0;
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struct request *rq;
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char sense[SCSI_SENSE_BUFFERSIZE];
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struct bio *bio;
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if (hdr->interface_id != 'S')
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return -EINVAL;
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if (hdr->cmd_len > BLK_MAX_CDB)
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return -EINVAL;
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if (hdr->dxfer_len > (q->max_hw_sectors << 9))
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return -EIO;
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if (hdr->dxfer_len)
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switch (hdr->dxfer_direction) {
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default:
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return -EINVAL;
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case SG_DXFER_TO_DEV:
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writing = 1;
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break;
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case SG_DXFER_TO_FROM_DEV:
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case SG_DXFER_FROM_DEV:
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break;
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}
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rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
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if (!rq)
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return -ENOMEM;
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if (file)
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has_write_perm = file->f_mode & FMODE_WRITE;
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if (blk_fill_sghdr_rq(q, rq, hdr, has_write_perm)) {
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blk_put_request(rq);
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return -EFAULT;
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}
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if (hdr->iovec_count) {
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const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
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struct sg_iovec *iov;
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iov = kmalloc(size, GFP_KERNEL);
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if (!iov) {
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ret = -ENOMEM;
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goto out;
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}
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if (copy_from_user(iov, hdr->dxferp, size)) {
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kfree(iov);
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ret = -EFAULT;
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goto out;
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}
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ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
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hdr->dxfer_len);
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kfree(iov);
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} else if (hdr->dxfer_len)
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ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
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if (ret)
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goto out;
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bio = rq->bio;
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memset(sense, 0, sizeof(sense));
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rq->sense = sense;
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rq->sense_len = 0;
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rq->retries = 0;
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start_time = jiffies;
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/* ignore return value. All information is passed back to caller
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* (if he doesn't check that is his problem).
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* N.B. a non-zero SCSI status is _not_ necessarily an error.
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*/
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blk_execute_rq(q, bd_disk, rq, 0);
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hdr->duration = jiffies_to_msecs(jiffies - start_time);
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return blk_complete_sghdr_rq(rq, hdr, bio);
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out:
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blk_put_request(rq);
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return ret;
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}
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/**
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* sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
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* @file: file this ioctl operates on (optional)
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* @q: request queue to send scsi commands down
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* @disk: gendisk to operate on (option)
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* @sic: userspace structure describing the command to perform
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*
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* Send down the scsi command described by @sic to the device below
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* the request queue @q. If @file is non-NULL it's used to perform
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* fine-grained permission checks that allow users to send down
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* non-destructive SCSI commands. If the caller has a struct gendisk
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* available it should be passed in as @disk to allow the low level
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* driver to use the information contained in it. A non-NULL @disk
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* is only allowed if the caller knows that the low level driver doesn't
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* need it (e.g. in the scsi subsystem).
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*
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* Notes:
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* - This interface is deprecated - users should use the SG_IO
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* interface instead, as this is a more flexible approach to
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* performing SCSI commands on a device.
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* - The SCSI command length is determined by examining the 1st byte
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* of the given command. There is no way to override this.
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* - Data transfers are limited to PAGE_SIZE
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* - The length (x + y) must be at least OMAX_SB_LEN bytes long to
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* accommodate the sense buffer when an error occurs.
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* The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
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* old code will not be surprised.
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* - If a Unix error occurs (e.g. ENOMEM) then the user will receive
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* a negative return and the Unix error code in 'errno'.
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* If the SCSI command succeeds then 0 is returned.
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* Positive numbers returned are the compacted SCSI error codes (4
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* bytes in one int) where the lowest byte is the SCSI status.
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*/
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#define OMAX_SB_LEN 16 /* For backward compatibility */
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int sg_scsi_ioctl(struct file *file, struct request_queue *q,
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struct gendisk *disk, struct scsi_ioctl_command __user *sic)
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{
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struct request *rq;
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int err;
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unsigned int in_len, out_len, bytes, opcode, cmdlen;
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char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
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if (!sic)
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return -EINVAL;
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/*
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* get in an out lengths, verify they don't exceed a page worth of data
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*/
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if (get_user(in_len, &sic->inlen))
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return -EFAULT;
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if (get_user(out_len, &sic->outlen))
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return -EFAULT;
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if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
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return -EINVAL;
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if (get_user(opcode, sic->data))
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return -EFAULT;
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bytes = max(in_len, out_len);
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if (bytes) {
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buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
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if (!buffer)
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return -ENOMEM;
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}
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rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
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cmdlen = COMMAND_SIZE(opcode);
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/*
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* get command and data to send to device, if any
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*/
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err = -EFAULT;
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rq->cmd_len = cmdlen;
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if (copy_from_user(rq->cmd, sic->data, cmdlen))
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goto error;
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if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
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goto error;
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err = blk_verify_command(rq->cmd, file->f_mode & FMODE_WRITE);
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if (err)
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goto error;
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/* default. possible overriden later */
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rq->retries = 5;
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switch (opcode) {
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case SEND_DIAGNOSTIC:
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case FORMAT_UNIT:
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rq->timeout = FORMAT_UNIT_TIMEOUT;
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rq->retries = 1;
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break;
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case START_STOP:
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rq->timeout = START_STOP_TIMEOUT;
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break;
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case MOVE_MEDIUM:
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rq->timeout = MOVE_MEDIUM_TIMEOUT;
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break;
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case READ_ELEMENT_STATUS:
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rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
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break;
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case READ_DEFECT_DATA:
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rq->timeout = READ_DEFECT_DATA_TIMEOUT;
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rq->retries = 1;
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break;
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default:
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|
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
|
|
break;
|
|
}
|
|
|
|
if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
|
|
err = DRIVER_ERROR << 24;
|
|
goto out;
|
|
}
|
|
|
|
memset(sense, 0, sizeof(sense));
|
|
rq->sense = sense;
|
|
rq->sense_len = 0;
|
|
rq->cmd_type = REQ_TYPE_BLOCK_PC;
|
|
|
|
blk_execute_rq(q, disk, rq, 0);
|
|
|
|
out:
|
|
err = rq->errors & 0xff; /* only 8 bit SCSI status */
|
|
if (err) {
|
|
if (rq->sense_len && rq->sense) {
|
|
bytes = (OMAX_SB_LEN > rq->sense_len) ?
|
|
rq->sense_len : OMAX_SB_LEN;
|
|
if (copy_to_user(sic->data, rq->sense, bytes))
|
|
err = -EFAULT;
|
|
}
|
|
} else {
|
|
if (copy_to_user(sic->data, buffer, out_len))
|
|
err = -EFAULT;
|
|
}
|
|
|
|
error:
|
|
kfree(buffer);
|
|
blk_put_request(rq);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
|
|
|
|
/* Send basic block requests */
|
|
static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
|
|
int cmd, int data)
|
|
{
|
|
struct request *rq;
|
|
int err;
|
|
|
|
rq = blk_get_request(q, WRITE, __GFP_WAIT);
|
|
rq->cmd_type = REQ_TYPE_BLOCK_PC;
|
|
rq->data = NULL;
|
|
rq->data_len = 0;
|
|
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
|
|
memset(rq->cmd, 0, sizeof(rq->cmd));
|
|
rq->cmd[0] = cmd;
|
|
rq->cmd[4] = data;
|
|
rq->cmd_len = 6;
|
|
err = blk_execute_rq(q, bd_disk, rq, 0);
|
|
blk_put_request(rq);
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int blk_send_start_stop(struct request_queue *q,
|
|
struct gendisk *bd_disk, int data)
|
|
{
|
|
return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
|
|
}
|
|
|
|
int scsi_cmd_ioctl(struct file *file, struct request_queue *q,
|
|
struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
|
|
{
|
|
int err;
|
|
|
|
if (!q || blk_get_queue(q))
|
|
return -ENXIO;
|
|
|
|
switch (cmd) {
|
|
/*
|
|
* new sgv3 interface
|
|
*/
|
|
case SG_GET_VERSION_NUM:
|
|
err = sg_get_version(arg);
|
|
break;
|
|
case SCSI_IOCTL_GET_IDLUN:
|
|
err = scsi_get_idlun(q, arg);
|
|
break;
|
|
case SCSI_IOCTL_GET_BUS_NUMBER:
|
|
err = scsi_get_bus(q, arg);
|
|
break;
|
|
case SG_SET_TIMEOUT:
|
|
err = sg_set_timeout(q, arg);
|
|
break;
|
|
case SG_GET_TIMEOUT:
|
|
err = sg_get_timeout(q);
|
|
break;
|
|
case SG_GET_RESERVED_SIZE:
|
|
err = sg_get_reserved_size(q, arg);
|
|
break;
|
|
case SG_SET_RESERVED_SIZE:
|
|
err = sg_set_reserved_size(q, arg);
|
|
break;
|
|
case SG_EMULATED_HOST:
|
|
err = sg_emulated_host(q, arg);
|
|
break;
|
|
case SG_IO: {
|
|
struct sg_io_hdr hdr;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(&hdr, arg, sizeof(hdr)))
|
|
break;
|
|
err = sg_io(file, q, bd_disk, &hdr);
|
|
if (err == -EFAULT)
|
|
break;
|
|
|
|
if (copy_to_user(arg, &hdr, sizeof(hdr)))
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
case CDROM_SEND_PACKET: {
|
|
struct cdrom_generic_command cgc;
|
|
struct sg_io_hdr hdr;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(&cgc, arg, sizeof(cgc)))
|
|
break;
|
|
cgc.timeout = clock_t_to_jiffies(cgc.timeout);
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
hdr.interface_id = 'S';
|
|
hdr.cmd_len = sizeof(cgc.cmd);
|
|
hdr.dxfer_len = cgc.buflen;
|
|
err = 0;
|
|
switch (cgc.data_direction) {
|
|
case CGC_DATA_UNKNOWN:
|
|
hdr.dxfer_direction = SG_DXFER_UNKNOWN;
|
|
break;
|
|
case CGC_DATA_WRITE:
|
|
hdr.dxfer_direction = SG_DXFER_TO_DEV;
|
|
break;
|
|
case CGC_DATA_READ:
|
|
hdr.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
break;
|
|
case CGC_DATA_NONE:
|
|
hdr.dxfer_direction = SG_DXFER_NONE;
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
if (err)
|
|
break;
|
|
|
|
hdr.dxferp = cgc.buffer;
|
|
hdr.sbp = cgc.sense;
|
|
if (hdr.sbp)
|
|
hdr.mx_sb_len = sizeof(struct request_sense);
|
|
hdr.timeout = cgc.timeout;
|
|
hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
|
|
hdr.cmd_len = sizeof(cgc.cmd);
|
|
|
|
err = sg_io(file, q, bd_disk, &hdr);
|
|
if (err == -EFAULT)
|
|
break;
|
|
|
|
if (hdr.status)
|
|
err = -EIO;
|
|
|
|
cgc.stat = err;
|
|
cgc.buflen = hdr.resid;
|
|
if (copy_to_user(arg, &cgc, sizeof(cgc)))
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* old junk scsi send command ioctl
|
|
*/
|
|
case SCSI_IOCTL_SEND_COMMAND:
|
|
printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
|
|
err = -EINVAL;
|
|
if (!arg)
|
|
break;
|
|
|
|
err = sg_scsi_ioctl(file, q, bd_disk, arg);
|
|
break;
|
|
case CDROMCLOSETRAY:
|
|
err = blk_send_start_stop(q, bd_disk, 0x03);
|
|
break;
|
|
case CDROMEJECT:
|
|
err = blk_send_start_stop(q, bd_disk, 0x02);
|
|
break;
|
|
default:
|
|
err = -ENOTTY;
|
|
}
|
|
|
|
blk_put_queue(q);
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(scsi_cmd_ioctl);
|