diff options
Diffstat (limited to 'block/scsi_ioctl.c')
| -rw-r--r-- | block/scsi_ioctl.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index fbdf0d802ec..260fa80ef57 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -24,6 +24,7 @@ #include <linux/capability.h> #include <linux/completion.h> #include <linux/cdrom.h> +#include <linux/ratelimit.h> #include <linux/slab.h> #include <linux/times.h> #include <asm/uaccess.h> @@ -690,6 +691,57 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod } EXPORT_SYMBOL(scsi_cmd_ioctl); +int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) +{ + if (bd && bd == bd->bd_contains) + return 0; + + /* Actually none of these is particularly useful on a partition, + * but they are safe. + */ + switch (cmd) { + case SCSI_IOCTL_GET_IDLUN: + case SCSI_IOCTL_GET_BUS_NUMBER: + case SCSI_IOCTL_GET_PCI: + case SCSI_IOCTL_PROBE_HOST: + case SG_GET_VERSION_NUM: + case SG_SET_TIMEOUT: + case SG_GET_TIMEOUT: + case SG_GET_RESERVED_SIZE: + case SG_SET_RESERVED_SIZE: + case SG_EMULATED_HOST: + return 0; + case CDROM_GET_CAPABILITY: + /* Keep this until we remove the printk below. udev sends it + * and we do not want to spam dmesg about it. CD-ROMs do + * not have partitions, so we get here only for disks. + */ + return -ENOIOCTLCMD; + default: + break; + } + + /* In particular, rule out all resets and host-specific ioctls. */ + printk_ratelimited(KERN_WARNING + "%s: sending ioctl %x to a partition!\n", current->comm, cmd); + + return capable(CAP_SYS_RAWIO) ? 0 : -ENOIOCTLCMD; +} +EXPORT_SYMBOL(scsi_verify_blk_ioctl); + +int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, + unsigned int cmd, void __user *arg) +{ + int ret; + + ret = scsi_verify_blk_ioctl(bd, cmd); + if (ret < 0) + return ret; + + return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); +} +EXPORT_SYMBOL(scsi_cmd_blk_ioctl); + static int __init blk_scsi_ioctl_init(void) { blk_set_cmd_filter_defaults(&blk_default_cmd_filter); |