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block: move capacity validation to blkpg_do_ioctl()

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Commit 6d4e80db4e ("block: add capacity validation in
bdev_add_partition()") add check of partition's start and end sectors to
prevent exceeding the size of the disk when adding partitions. However,
there is still no check for resizing partitions now.
Move the check to blkpg_do_ioctl() to cover resizing partitions.

Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240305032132.548958-1-lilingfeng@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Li Lingfeng 2024-03-05 11:21:32 +08:00 committed by Jens Axboe
parent 93f52fbeaf
commit b9355185d2
2 changed files with 8 additions and 12 deletions
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9
block/ioctl.c
View File

@ -18,7 +18,7 @@ static int blkpg_do_ioctl(struct block_device *bdev,
{
struct gendisk *disk = bdev->bd_disk;
struct blkpg_partition p;
sector_t start, length;
sector_t start, length, capacity, end;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
@ -41,6 +41,13 @@ static int blkpg_do_ioctl(struct block_device *bdev,
start = p.start >> SECTOR_SHIFT;
length = p.length >> SECTOR_SHIFT;
capacity = get_capacity(disk);
if (check_add_overflow(start, length, &end))
return -EINVAL;
if (start >= capacity || end > capacity)
return -EINVAL;
switch (op) {
case BLKPG_ADD_PARTITION:

11
block/partitions/core.c
View File

@ -419,21 +419,10 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start,
int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length)
{
sector_t capacity = get_capacity(disk), end;
struct block_device *part;
int ret;
mutex_lock(&disk->open_mutex);
if (check_add_overflow(start, length, &end)) {
ret = -EINVAL;
goto out;
}
if (start >= capacity || end > capacity) {
ret = -EINVAL;
goto out;
}
if (!disk_live(disk)) {
ret = -ENXIO;
goto out;