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block: don't add or resize partition on the disk with GENHD_FL_NO_PART

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Commit a33df75c63 ("block: use an xarray for disk->part_tbl") remove
disk_expand_part_tbl() in add_partition(), which means all kinds of
devices will support extended dynamic `dev_t`.
However, some devices with GENHD_FL_NO_PART are not expected to add or
resize partition.
Fix this by adding check of GENHD_FL_NO_PART before add or resize
partition.

Fixes: a33df75c63 ("block: use an xarray for disk->part_tbl")
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230831075900.1725842-1-lilingfeng@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Li Lingfeng 2023-08-31 15:59:00 +08:00 committed by Jens Axboe
parent 0d997f1de8
commit 1a721de848
1 changed files with 2 additions and 0 deletions
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2
block/ioctl.c
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@ -20,6 +20,8 @@ static int blkpg_do_ioctl(struct block_device *bdev,
struct blkpg_partition p; struct blkpg_partition p;
long long start, length; long long start, length;
if (disk->flags & GENHD_FL_NO_PART)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN)) if (!capable(CAP_SYS_ADMIN))
return -EACCES; return -EACCES;
if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))