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block: move cmdfilter from gendisk to request_queue

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cmd_filter works only for the block layer SG_IO with SCSI block
devices. It breaks scsi/sg.c, bsg, and the block layer SG_IO with SCSI
character devices (such as st). We hit a kernel crash with them.

The problem is that cmd_filter code accesses to gendisk (having struct
blk_scsi_cmd_filter) via inode->i_bdev->bd_disk. It works for only
SCSI block device files. With character device files, inode->i_bdev
leads you to struct cdev. inode->i_bdev->bd_disk->blk_scsi_cmd_filter
isn't safe.

SCSI ULDs don't expose gendisk; they keep it private. bsg needs to be
independent on any protocols. We shouldn't change ULDs to expose their
gendisk.

This patch moves struct blk_scsi_cmd_filter from gendisk to
request_queue, a common object, which eveyone can access to.

The user interface doesn't change; users can change the filters via
/sys/block/. gendisk has a pointer to request_queue so the cmd_filter
code accesses to struct blk_scsi_cmd_filter.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori 2008-08-16 14:10:05 +09:00 committed by Jens Axboe
parent 1941246dd9
commit abf5439370
7 changed files with 132 additions and 163 deletions
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2
block/blk-core.c
View File

@ -582,6 +582,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
q->sg_reserved_size = INT_MAX; q->sg_reserved_size = INT_MAX;
blk_set_cmd_filter_defaults(&q->cmd_filter);
/* /*
* all done * all done
*/ */

44
block/bsg.c
View File

@ -45,8 +45,6 @@ struct bsg_device {
char name[BUS_ID_SIZE]; char name[BUS_ID_SIZE];
int max_queue; int max_queue;
unsigned long flags; unsigned long flags;
struct blk_scsi_cmd_filter *cmd_filter;
mode_t *f_mode;
}; };
enum { enum {
@ -174,7 +172,8 @@ static int bsg_io_schedule(struct bsg_device *bd)
} }
static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
struct sg_io_v4 *hdr, struct bsg_device *bd) struct sg_io_v4 *hdr, struct bsg_device *bd,
int has_write_perm)
{ {
if (hdr->request_len > BLK_MAX_CDB) { if (hdr->request_len > BLK_MAX_CDB) {
rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
@ -187,8 +186,7 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
return -EFAULT; return -EFAULT;
if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
if (blk_cmd_filter_verify_command(bd->cmd_filter, rq->cmd, if (blk_verify_command(&q->cmd_filter, rq->cmd, has_write_perm))
bd->f_mode))
return -EPERM; return -EPERM;
} else if (!capable(CAP_SYS_RAWIO)) } else if (!capable(CAP_SYS_RAWIO))
return -EPERM; return -EPERM;
@ -244,7 +242,7 @@ bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw)
* map sg_io_v4 to a request. * map sg_io_v4 to a request.
*/ */
static struct request * static struct request *
bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, int has_write_perm)
{ {
struct request_queue *q = bd->queue; struct request_queue *q = bd->queue;
struct request *rq, *next_rq = NULL; struct request *rq, *next_rq = NULL;
@ -266,7 +264,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
rq = blk_get_request(q, rw, GFP_KERNEL); rq = blk_get_request(q, rw, GFP_KERNEL);
if (!rq) if (!rq)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd); ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm);
if (ret) if (ret)
goto out; goto out;
@ -568,25 +566,6 @@ static inline void bsg_set_block(struct bsg_device *bd, struct file *file)
set_bit(BSG_F_BLOCK, &bd->flags); set_bit(BSG_F_BLOCK, &bd->flags);
} }
static void bsg_set_cmd_filter(struct bsg_device *bd,
struct file *file)
{
struct inode *inode;
struct gendisk *disk;
if (!file)
return;
inode = file->f_dentry->d_inode;
if (!inode)
return;
disk = inode->i_bdev->bd_disk;
bd->cmd_filter = &disk->cmd_filter;
bd->f_mode = &file->f_mode;
}
/* /*
* Check if the error is a "real" error that we should return. * Check if the error is a "real" error that we should return.
*/ */
@ -608,7 +587,6 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
dprintk("%s: read %Zd bytes\n", bd->name, count); dprintk("%s: read %Zd bytes\n", bd->name, count);
bsg_set_block(bd, file); bsg_set_block(bd, file);
bsg_set_cmd_filter(bd, file);
bytes_read = 0; bytes_read = 0;
ret = __bsg_read(buf, count, bd, NULL, &bytes_read); ret = __bsg_read(buf, count, bd, NULL, &bytes_read);
@ -621,7 +599,7 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
} }
static int __bsg_write(struct bsg_device *bd, const char __user *buf, static int __bsg_write(struct bsg_device *bd, const char __user *buf,
size_t count, ssize_t *bytes_written) size_t count, ssize_t *bytes_written, int has_write_perm)
{ {
struct bsg_command *bc; struct bsg_command *bc;
struct request *rq; struct request *rq;
@ -652,7 +630,7 @@ static int __bsg_write(struct bsg_device *bd, const char __user *buf,
/* /*
* get a request, fill in the blanks, and add to request queue * get a request, fill in the blanks, and add to request queue
*/ */
rq = bsg_map_hdr(bd, &bc->hdr); rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm);
if (IS_ERR(rq)) { if (IS_ERR(rq)) {
ret = PTR_ERR(rq); ret = PTR_ERR(rq);
rq = NULL; rq = NULL;
@ -683,10 +661,11 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
dprintk("%s: write %Zd bytes\n", bd->name, count); dprintk("%s: write %Zd bytes\n", bd->name, count);
bsg_set_block(bd, file); bsg_set_block(bd, file);
bsg_set_cmd_filter(bd, file);
bytes_written = 0; bytes_written = 0;
ret = __bsg_write(bd, buf, count, &bytes_written); ret = __bsg_write(bd, buf, count, &bytes_written,
file->f_mode & FMODE_WRITE);
*ppos = bytes_written; *ppos = bytes_written;
/* /*
@ -792,7 +771,6 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
bd->queue = rq; bd->queue = rq;
bsg_set_block(bd, file); bsg_set_block(bd, file);
bsg_set_cmd_filter(bd, file);
atomic_set(&bd->ref_count, 1); atomic_set(&bd->ref_count, 1);
mutex_lock(&bsg_mutex); mutex_lock(&bsg_mutex);
@ -943,7 +921,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (copy_from_user(&hdr, uarg, sizeof(hdr))) if (copy_from_user(&hdr, uarg, sizeof(hdr)))
return -EFAULT; return -EFAULT;
rq = bsg_map_hdr(bd, &hdr); rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE);
if (IS_ERR(rq)) if (IS_ERR(rq))
return PTR_ERR(rq); return PTR_ERR(rq);

118
block/cmd-filter.c
View File

@ -27,8 +27,8 @@
#include <scsi/scsi.h> #include <scsi/scsi.h>
#include <linux/cdrom.h> #include <linux/cdrom.h>
int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter, int blk_verify_command(struct blk_scsi_cmd_filter *filter,
unsigned char *cmd, mode_t *f_mode) unsigned char *cmd, int has_write_perm)
{ {
/* root can do any command. */ /* root can do any command. */
if (capable(CAP_SYS_RAWIO)) if (capable(CAP_SYS_RAWIO))
@ -43,30 +43,11 @@ int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter,
return 0; return 0;
/* Write-safe commands require a writable open */ /* Write-safe commands require a writable open */
if (test_bit(cmd[0], filter->write_ok) && (*f_mode & FMODE_WRITE)) if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
return 0; return 0;
return -EPERM; return -EPERM;
} }
EXPORT_SYMBOL(blk_cmd_filter_verify_command);
int blk_verify_command(struct file *file, unsigned char *cmd)
{
struct gendisk *disk;
struct inode *inode;
if (!file)
return -EINVAL;
inode = file->f_dentry->d_inode;
if (!inode)
return -EINVAL;
disk = inode->i_bdev->bd_disk;
return blk_cmd_filter_verify_command(&disk->cmd_filter,
cmd, &file->f_mode);
}
EXPORT_SYMBOL(blk_verify_command); EXPORT_SYMBOL(blk_verify_command);
/* and now, the sysfs stuff */ /* and now, the sysfs stuff */
@ -219,114 +200,27 @@ static struct kobj_type rcf_ktype = {
.default_attrs = default_attrs, .default_attrs = default_attrs,
}; };
#ifndef MAINTENANCE_IN_CMD
#define MAINTENANCE_IN_CMD 0xa3
#endif
static void rcf_set_defaults(struct blk_scsi_cmd_filter *filter)
{
/* Basic read-only commands */
__set_bit(TEST_UNIT_READY, filter->read_ok);
__set_bit(REQUEST_SENSE, filter->read_ok);
__set_bit(READ_6, filter->read_ok);
__set_bit(READ_10, filter->read_ok);
__set_bit(READ_12, filter->read_ok);
__set_bit(READ_16, filter->read_ok);
__set_bit(READ_BUFFER, filter->read_ok);
__set_bit(READ_DEFECT_DATA, filter->read_ok);
__set_bit(READ_CAPACITY, filter->read_ok);
__set_bit(READ_LONG, filter->read_ok);
__set_bit(INQUIRY, filter->read_ok);
__set_bit(MODE_SENSE, filter->read_ok);
__set_bit(MODE_SENSE_10, filter->read_ok);
__set_bit(LOG_SENSE, filter->read_ok);
__set_bit(START_STOP, filter->read_ok);
__set_bit(GPCMD_VERIFY_10, filter->read_ok);
__set_bit(VERIFY_16, filter->read_ok);
__set_bit(REPORT_LUNS, filter->read_ok);
__set_bit(SERVICE_ACTION_IN, filter->read_ok);
__set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
__set_bit(MAINTENANCE_IN_CMD, filter->read_ok);
__set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
/* Audio CD commands */
__set_bit(GPCMD_PLAY_CD, filter->read_ok);
__set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
__set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
__set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
__set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
/* CD/DVD data reading */
__set_bit(GPCMD_READ_CD, filter->read_ok);
__set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
__set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
__set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
__set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
__set_bit(GPCMD_READ_HEADER, filter->read_ok);
__set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
__set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
__set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
__set_bit(GPCMD_REPORT_KEY, filter->read_ok);
__set_bit(GPCMD_SCAN, filter->read_ok);
__set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
__set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
__set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
__set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
__set_bit(GPCMD_SEEK, filter->read_ok);
__set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
/* Basic writing commands */
__set_bit(WRITE_6, filter->write_ok);
__set_bit(WRITE_10, filter->write_ok);
__set_bit(WRITE_VERIFY, filter->write_ok);
__set_bit(WRITE_12, filter->write_ok);
__set_bit(WRITE_VERIFY_12, filter->write_ok);
__set_bit(WRITE_16, filter->write_ok);
__set_bit(WRITE_LONG, filter->write_ok);
__set_bit(WRITE_LONG_2, filter->write_ok);
__set_bit(ERASE, filter->write_ok);
__set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
__set_bit(MODE_SELECT, filter->write_ok);
__set_bit(LOG_SELECT, filter->write_ok);
__set_bit(GPCMD_BLANK, filter->write_ok);
__set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
__set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
__set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
__set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
__set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
__set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
__set_bit(GPCMD_SEND_EVENT, filter->write_ok);
__set_bit(GPCMD_SEND_KEY, filter->write_ok);
__set_bit(GPCMD_SEND_OPC, filter->write_ok);
__set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
__set_bit(GPCMD_SET_SPEED, filter->write_ok);
__set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
__set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
__set_bit(GPCMD_SET_STREAMING, filter->write_ok);
}
int blk_register_filter(struct gendisk *disk) int blk_register_filter(struct gendisk *disk)
{ {
int ret; int ret;
struct blk_scsi_cmd_filter *filter = &disk->cmd_filter; struct blk_scsi_cmd_filter *filter = &disk->queue->cmd_filter;
struct kobject *parent = kobject_get(disk->holder_dir->parent); struct kobject *parent = kobject_get(disk->holder_dir->parent);
if (!parent) if (!parent)
return -ENODEV; return -ENODEV;
ret = kobject_init_and_add(&filter->kobj, &rcf_ktype, parent, ret = kobject_init_and_add(&filter->kobj, &rcf_ktype, parent,
"%s", "cmd_filter"); "%s", "cmd_filter");
if (ret < 0) if (ret < 0)
return ret; return ret;
rcf_set_defaults(filter);
return 0; return 0;
} }
void blk_unregister_filter(struct gendisk *disk) void blk_unregister_filter(struct gendisk *disk)
{ {
struct blk_scsi_cmd_filter *filter = &disk->cmd_filter; struct blk_scsi_cmd_filter *filter = &disk->queue->cmd_filter;
kobject_put(&filter->kobj); kobject_put(&filter->kobj);
kobject_put(disk->holder_dir->parent); kobject_put(disk->holder_dir->parent);

94
block/scsi_ioctl.c
View File

@ -105,12 +105,96 @@ static int sg_emulated_host(struct request_queue *q, int __user *p)
return put_user(1, p); return put_user(1, p);
} }
void blk_set_cmd_filter_defaults(struct blk_scsi_cmd_filter *filter)
{
/* Basic read-only commands */
__set_bit(TEST_UNIT_READY, filter->read_ok);
__set_bit(REQUEST_SENSE, filter->read_ok);
__set_bit(READ_6, filter->read_ok);
__set_bit(READ_10, filter->read_ok);
__set_bit(READ_12, filter->read_ok);
__set_bit(READ_16, filter->read_ok);
__set_bit(READ_BUFFER, filter->read_ok);
__set_bit(READ_DEFECT_DATA, filter->read_ok);
__set_bit(READ_CAPACITY, filter->read_ok);
__set_bit(READ_LONG, filter->read_ok);
__set_bit(INQUIRY, filter->read_ok);
__set_bit(MODE_SENSE, filter->read_ok);
__set_bit(MODE_SENSE_10, filter->read_ok);
__set_bit(LOG_SENSE, filter->read_ok);
__set_bit(START_STOP, filter->read_ok);
__set_bit(GPCMD_VERIFY_10, filter->read_ok);
__set_bit(VERIFY_16, filter->read_ok);
__set_bit(REPORT_LUNS, filter->read_ok);
__set_bit(SERVICE_ACTION_IN, filter->read_ok);
__set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
__set_bit(MAINTENANCE_IN, filter->read_ok);
__set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
/* Audio CD commands */
__set_bit(GPCMD_PLAY_CD, filter->read_ok);
__set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
__set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
__set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
__set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
/* CD/DVD data reading */
__set_bit(GPCMD_READ_CD, filter->read_ok);
__set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
__set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
__set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
__set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
__set_bit(GPCMD_READ_HEADER, filter->read_ok);
__set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
__set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
__set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
__set_bit(GPCMD_REPORT_KEY, filter->read_ok);
__set_bit(GPCMD_SCAN, filter->read_ok);
__set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
__set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
__set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
__set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
__set_bit(GPCMD_SEEK, filter->read_ok);
__set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
/* Basic writing commands */
__set_bit(WRITE_6, filter->write_ok);
__set_bit(WRITE_10, filter->write_ok);
__set_bit(WRITE_VERIFY, filter->write_ok);
__set_bit(WRITE_12, filter->write_ok);
__set_bit(WRITE_VERIFY_12, filter->write_ok);
__set_bit(WRITE_16, filter->write_ok);
__set_bit(WRITE_LONG, filter->write_ok);
__set_bit(WRITE_LONG_2, filter->write_ok);
__set_bit(ERASE, filter->write_ok);
__set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
__set_bit(MODE_SELECT, filter->write_ok);
__set_bit(LOG_SELECT, filter->write_ok);
__set_bit(GPCMD_BLANK, filter->write_ok);
__set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
__set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
__set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
__set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
__set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
__set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
__set_bit(GPCMD_SEND_EVENT, filter->write_ok);
__set_bit(GPCMD_SEND_KEY, filter->write_ok);
__set_bit(GPCMD_SEND_OPC, filter->write_ok);
__set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
__set_bit(GPCMD_SET_SPEED, filter->write_ok);
__set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
__set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
__set_bit(GPCMD_SET_STREAMING, filter->write_ok);
}
EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults);
static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
struct sg_io_hdr *hdr, struct file *file) struct sg_io_hdr *hdr, struct file *file)
{ {
if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
return -EFAULT; return -EFAULT;
if (blk_verify_command(file, rq->cmd)) if (blk_verify_command(&q->cmd_filter, rq->cmd,
file->f_mode & FMODE_WRITE))
return -EPERM; return -EPERM;
/* /*
@ -298,7 +382,7 @@ int sg_scsi_ioctl(struct file *file, struct request_queue *q,
struct gendisk *disk, struct scsi_ioctl_command __user *sic) struct gendisk *disk, struct scsi_ioctl_command __user *sic)
{ {
struct request *rq; struct request *rq;
int err; int err, write_perm = 0;
unsigned int in_len, out_len, bytes, opcode, cmdlen; unsigned int in_len, out_len, bytes, opcode, cmdlen;
char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
@ -340,7 +424,11 @@ int sg_scsi_ioctl(struct file *file, struct request_queue *q,
if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
goto error; goto error;
err = blk_verify_command(file, rq->cmd); /* scsi_ioctl passes NULL */
if (file && (file->f_mode & FMODE_WRITE))
write_perm = 1;
err = blk_verify_command(&q->cmd_filter, rq->cmd, write_perm);
if (err) if (err)
goto error; goto error;

11
drivers/scsi/sg.c
View File

@ -641,6 +641,7 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
unsigned char cmnd[MAX_COMMAND_SIZE]; unsigned char cmnd[MAX_COMMAND_SIZE];
int timeout; int timeout;
unsigned long ul_timeout; unsigned long ul_timeout;
struct request_queue *q;
if (count < SZ_SG_IO_HDR) if (count < SZ_SG_IO_HDR)
return -EINVAL; return -EINVAL;
@ -689,7 +690,9 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
sg_remove_request(sfp, srp); sg_remove_request(sfp, srp);
return -EFAULT; return -EFAULT;
} }
if (read_only && !blk_verify_command(file, cmnd)) { q = sfp->parentdp->device->request_queue;
if (read_only && blk_verify_command(&q->cmd_filter, cmnd,
file->f_mode & FMODE_WRITE)) {
sg_remove_request(sfp, srp); sg_remove_request(sfp, srp);
return -EPERM; return -EPERM;
} }
@ -793,6 +796,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
return -ENXIO; return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
sdp->disk->disk_name, (int) cmd_in)); sdp->disk->disk_name, (int) cmd_in));
read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
@ -1057,11 +1061,14 @@ sg_ioctl(struct inode *inode, struct file *filp,
return -ENODEV; return -ENODEV;
if (read_only) { if (read_only) {
unsigned char opcode = WRITE_6; unsigned char opcode = WRITE_6;
struct request_queue *q = sdp->device->request_queue;
Scsi_Ioctl_Command __user *siocp = p; Scsi_Ioctl_Command __user *siocp = p;
if (copy_from_user(&opcode, siocp->data, 1)) if (copy_from_user(&opcode, siocp->data, 1))
return -EFAULT; return -EFAULT;
if (!blk_verify_command(filp, &opcode)) if (blk_verify_command(&q->cmd_filter,
&opcode,
filp->f_mode & FMODE_WRITE))
return -EPERM; return -EPERM;
} }
return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);

16
include/linux/blkdev.h
View File

@ -280,6 +280,15 @@ struct blk_queue_tag {
atomic_t refcnt; /* map can be shared */ atomic_t refcnt; /* map can be shared */
}; };
#define BLK_SCSI_MAX_CMDS (256)
#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
struct blk_scsi_cmd_filter {
unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
struct kobject kobj;
};
struct request_queue struct request_queue
{ {
/* /*
@ -398,6 +407,7 @@ struct request_queue
#if defined(CONFIG_BLK_DEV_BSG) #if defined(CONFIG_BLK_DEV_BSG)
struct bsg_class_device bsg_dev; struct bsg_class_device bsg_dev;
#endif #endif
struct blk_scsi_cmd_filter cmd_filter;
}; };
#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */
@ -833,11 +843,11 @@ extern int blkdev_issue_flush(struct block_device *, sector_t *);
/* /*
* command filter functions * command filter functions
*/ */
extern int blk_verify_command(struct file *file, unsigned char *cmd); extern int blk_verify_command(struct blk_scsi_cmd_filter *filter,
extern int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter, unsigned char *cmd, int has_write_perm);
unsigned char *cmd, mode_t *f_mode);
extern int blk_register_filter(struct gendisk *disk); extern int blk_register_filter(struct gendisk *disk);
extern void blk_unregister_filter(struct gendisk *disk); extern void blk_unregister_filter(struct gendisk *disk);
extern void blk_set_cmd_filter_defaults(struct blk_scsi_cmd_filter *filter);
#define MAX_PHYS_SEGMENTS 128 #define MAX_PHYS_SEGMENTS 128
#define MAX_HW_SEGMENTS 128 #define MAX_HW_SEGMENTS 128

10
include/linux/genhd.h
View File

@ -110,15 +110,6 @@ struct hd_struct {
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
#define GENHD_FL_FAIL 64 #define GENHD_FL_FAIL 64
#define BLK_SCSI_MAX_CMDS (256)
#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
struct blk_scsi_cmd_filter {
unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
struct kobject kobj;
};
struct gendisk { struct gendisk {
int major; /* major number of driver */ int major; /* major number of driver */
int first_minor; int first_minor;
@ -128,7 +119,6 @@ struct gendisk {
struct hd_struct **part; /* [indexed by minor] */ struct hd_struct **part; /* [indexed by minor] */
struct block_device_operations *fops; struct block_device_operations *fops;
struct request_queue *queue; struct request_queue *queue;
struct blk_scsi_cmd_filter cmd_filter;
void *private_data; void *private_data;
sector_t capacity; sector_t capacity;