delete_partition() clears the cached last_lookup partition. However the .last_lookup cache may be overwritten by one IO path after it is cleared from delete_partition(). Then another IO path may use the cached deleting partition after __delete_partition() is called, then use-after-free is triggered on the cached partition. Fixes the issue by the following approach: 1) always get the partition's refcount via hd_struct_try_get() before setting .last_lookup 2) move clearing .last_lookup from delete_partition() to __delete_partition() which is release handle of the partition's percpu-refcount, so that no IO path can overwrite .last_lookup after it is cleared in __delete_partition(). It is one candidate approach of Yufen's patch[1] which adds overhead in fast path by indirect lookup which may introduce one extra cacheline in IO path. Also this patch relies on percpu-refcount's protection, and it is easier to understand and verify. [1] https://lore.kernel.org/linux-block/20200109013551.GB9655@ming.t460p/T/#t Reported-by: Yufen Yu <yuyufen@xxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Cc: Hou Tao <houtao1@xxxxxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> --- block/blk-core.c | 12 ------------ block/genhd.c | 6 +++++- block/partition-generic.c | 10 +++++++++- include/linux/genhd.h | 1 + 4 files changed, 15 insertions(+), 14 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 089e890ab208..79599f5fd5b7 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1365,18 +1365,6 @@ void blk_account_io_start(struct request *rq, bool new_io) part_stat_inc(part, merges[rw]); } else { part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq)); - if (!hd_struct_try_get(part)) { - /* - * The partition is already being removed, - * the request will be accounted on the disk only - * - * We take a reference on disk->part0 although that - * partition will never be deleted, so we can treat - * it as any other partition. - */ - part = &rq->rq_disk->part0; - hd_struct_get(part); - } part_inc_in_flight(rq->q, part, rw); rq->part = part; } diff --git a/block/genhd.c b/block/genhd.c index ff6268970ddc..6029c94510f0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -286,17 +286,21 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) ptbl = rcu_dereference(disk->part_tbl); part = rcu_dereference(ptbl->last_lookup); - if (part && sector_in_part(part, sector)) + if (part && sector_in_part(part, sector) && hd_struct_try_get(part)) return part; for (i = 1; i < ptbl->len; i++) { part = rcu_dereference(ptbl->part[i]); if (part && sector_in_part(part, sector)) { + if (!hd_struct_try_get(part)) + goto exit; rcu_assign_pointer(ptbl->last_lookup, part); return part; } } + exit: + hd_struct_get(&disk->part0); return &disk->part0; } EXPORT_SYMBOL_GPL(disk_map_sector_rcu); diff --git a/block/partition-generic.c b/block/partition-generic.c index 1d20c9cf213f..1739f750dbf2 100644 --- a/block/partition-generic.c +++ b/block/partition-generic.c @@ -262,6 +262,12 @@ static void delete_partition_work_fn(struct work_struct *work) void __delete_partition(struct percpu_ref *ref) { struct hd_struct *part = container_of(ref, struct hd_struct, ref); + struct disk_part_tbl *ptbl = + rcu_dereference_protected(part->disk->part_tbl, 1); + + rcu_assign_pointer(ptbl->last_lookup, NULL); + put_device(disk_to_dev(part->disk)); + INIT_RCU_WORK(&part->rcu_work, delete_partition_work_fn); queue_rcu_work(system_wq, &part->rcu_work); } @@ -283,8 +289,9 @@ void delete_partition(struct gendisk *disk, int partno) if (!part) return; + get_device(disk_to_dev(disk)); rcu_assign_pointer(ptbl->part[partno], NULL); - rcu_assign_pointer(ptbl->last_lookup, NULL); + kobject_put(part->holder_dir); device_del(part_to_dev(part)); @@ -349,6 +356,7 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno, p->nr_sects = len; p->partno = partno; p->policy = get_disk_ro(disk); + p->disk = disk; if (info) { struct partition_meta_info *pinfo = alloc_part_info(disk); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 8bb63027e4d6..1b09cfe00aa3 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -130,6 +130,7 @@ struct hd_struct { struct disk_stats dkstats; #endif struct percpu_ref ref; + struct gendisk *disk; struct rcu_work rcu_work; }; -- 2.20.1
