diff options
| -rw-r--r-- | drivers/mmc/core/block.c | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 274c1ed..9f93acd 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -564,14 +564,6 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev, int err = 0, ioc_err = 0; struct request *req; - /* - * The caller must have CAP_SYS_RAWIO, and must be calling this on the - * whole block device, not on a partition. This prevents overspray - * between sibling partitions. - */ - if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains)) - return -EPERM; - idata = mmc_blk_ioctl_copy_from_user(ic_ptr); if (IS_ERR(idata)) return PTR_ERR(idata); @@ -624,14 +616,6 @@ static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev, __u64 num_of_cmds; struct request *req; - /* - * The caller must have CAP_SYS_RAWIO, and must be calling this on the - * whole block device, not on a partition. This prevents overspray - * between sibling partitions. - */ - if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains)) - return -EPERM; - if (copy_from_user(&num_of_cmds, &user->num_of_cmds, sizeof(num_of_cmds))) return -EFAULT; @@ -698,14 +682,34 @@ cmd_err: return ioc_err ? ioc_err : err; } +static int mmc_blk_check_blkdev(struct block_device *bdev) +{ + /* + * The caller must have CAP_SYS_RAWIO, and must be calling this on the + * whole block device, not on a partition. This prevents overspray + * between sibling partitions. + */ + if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains)) + return -EPERM; + return 0; +} + static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { + int ret; + switch (cmd) { case MMC_IOC_CMD: + ret = mmc_blk_check_blkdev(bdev); + if (ret) + return ret; return mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg); case MMC_IOC_MULTI_CMD: + ret = mmc_blk_check_blkdev(bdev); + if (ret) + return ret; return mmc_blk_ioctl_multi_cmd(bdev, (struct mmc_ioc_multi_cmd __user *)arg); default: |
