Christoph Hellwig 889c05cc58 block: ensure the bdi is freed after inode_detach_wb ... inode_detach_wb references the "main" bdi of the inode. With the recent change to move the bdi from the request_queue to the gendisk this causes a guaranteed use after free when using certain cgroup configurations. The big itself is older through as any non-default inode reference (e.g. an open file descriptor) could have injected this use after free even before that. Fixes: 52ebea749a ("writeback: make backing_dev_info host cgroup-specific bdi_writebacks") Reported-by: Qian Cai <quic_qiancai@quicinc.com> Reported-by: syzbot <syzbot+1fb38bb7d3ce0fa3e1c4@syzkaller.appspotmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210816122614.601358-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>		2021-08-16 10:49:11 -06:00
..
partitions	block: free the extended dev_t minor later	2021-08-16 10:49:11 -06:00
Kconfig	block: make the block holder code optional	2021-08-09 11:50:42 -06:00
Kconfig.iosched	block/mq-deadline: Add cgroup support	2021-06-21 15:03:41 -06:00
Makefile	block: make the block holder code optional	2021-08-09 11:50:42 -06:00
badblocks.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
bfq-cgroup.c	block, bfq: merge bursts of newly-created queues	2021-03-25 10:50:07 -06:00
bfq-iosched.c	block: return ELEVATOR_DISCARD_MERGE if possible	2021-08-09 14:37:47 -06:00
bfq-iosched.h	block, bfq: merge bursts of newly-created queues	2021-03-25 10:50:07 -06:00
bfq-wf2q.c	block, bfq: always inject I/O of queues blocked by wakers	2021-03-25 10:50:07 -06:00
bio-integrity.c	block: use bvec_kmap_local in bio_integrity_process	2021-08-02 13:37:28 -06:00
bio.c	block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec	2021-08-02 13:37:27 -06:00
blk-cgroup-rwstat.c	blk-cgroup: Fix the recursive blkg rwstat	2021-03-05 11:32:15 -07:00
blk-cgroup-rwstat.h	blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT	2019-11-07 12:28:13 -07:00
blk-cgroup.c	block: move the bdi from the request_queue to the gendisk	2021-08-09 11:53:23 -06:00
blk-core.c	block: move the bdi from the request_queue to the gendisk	2021-08-09 11:53:23 -06:00
blk-crypto-fallback.c	block: rename BIO_MAX_PAGES to BIO_MAX_VECS	2021-03-11 07:47:48 -07:00
blk-crypto-internal.h	block: make blk_crypto_rq_bio_prep() able to fail	2020-10-05 10:47:43 -06:00
blk-crypto.c	dm: support key eviction from keyslot managers of underlying devices	2021-02-11 09:45:25 -05:00
blk-exec.c	block: return errors from blk_execute_rq()	2021-06-30 15:35:45 -06:00
blk-flush.c	block: avoid double io accounting for flush request	2021-05-24 06:47:21 -06:00
blk-integrity.c	block: remove the unused blk_integrity_merge_bio export	2020-10-06 07:29:53 -06:00
blk-ioc.c	block: remove retry loop in ioc_release_fn()	2020-07-16 10:22:15 -06:00
blk-iocost.c	blk-iocost: fix operation ordering in iocg_wake_fn()	2021-07-27 19:25:37 -06:00
blk-iolatency.c	block: Remove redundant 'return' statement	2020-10-08 07:59:48 -06:00
blk-ioprio.c	block: Introduce the ioprio rq-qos policy	2021-06-21 15:03:40 -06:00
blk-ioprio.h	block: Introduce the ioprio rq-qos policy	2021-06-21 15:03:40 -06:00
blk-lib.c	block: export blk_next_bio()	2021-06-17 15:51:20 +02:00
blk-map.c	block: use memcpy_from_bvec in bio_copy_kern_endio_read	2021-08-02 13:37:28 -06:00
blk-merge.c	blk-throtl: optimize IOPS throttle for large IO scenarios	2021-08-14 19:14:56 -06:00
blk-mq-cpumap.c	blk-mq: remove the calling of local_memory_node()	2020-10-20 07:08:17 -06:00
blk-mq-debugfs-zoned.c	block: Cleanup license notice	2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c	block: Introduce the ioprio rq-qos policy	2021-06-21 15:03:40 -06:00
blk-mq-debugfs.h	blk-mq: no need to check return value of debugfs_create functions	2019-06-13 03:00:30 -06:00
blk-mq-pci.c	block: Fix blk_mq_*_map_queues() kernel-doc headers	2019-05-31 15:12:34 -06:00
blk-mq-rdma.c	block: Fix blk_mq_*_map_queues() kernel-doc headers	2019-05-31 15:12:34 -06:00
blk-mq-sched.c	blk-mq-sched: Fix blk_mq_sched_alloc_tags() error handling	2021-07-27 16:44:38 -06:00
blk-mq-sched.h	blk: Fix lock inversion between ioc lock and bfqd lock	2021-06-24 18:43:55 -06:00
blk-mq-sysfs.c	block: remove blk-mq-sysfs dead code	2021-08-02 13:37:29 -06:00
blk-mq-tag.c	blk-mq: Use request queue-wide tags for tagset-wide sbitmap	2021-05-24 06:47:22 -06:00
blk-mq-tag.h	blk-mq: Some tag allocation code refactoring	2021-05-24 06:47:22 -06:00
blk-mq-virtio.c	blk-mq: Fix typo in comment	2020-03-17 20:55:21 +01:00
blk-mq.c	block: move the bdi from the request_queue to the gendisk	2021-08-09 11:53:23 -06:00
blk-mq.h	blk: Fix lock inversion between ioc lock and bfqd lock	2021-06-24 18:43:55 -06:00
blk-pm.c	scsi: block: Fix a race in the runtime power management code	2020-12-09 11:41:41 -05:00
blk-pm.h	block: Remove unused blk_pm_*() function definitions	2021-02-22 06:33:48 -07:00
blk-rq-qos.c	rq-qos: fix missed wake-ups in rq_qos_throttle try two	2021-06-08 15:12:57 -06:00
blk-rq-qos.h	block: Introduce the ioprio rq-qos policy	2021-06-21 15:03:40 -06:00
blk-settings.c	block: move the bdi from the request_queue to the gendisk	2021-08-09 11:53:23 -06:00
blk-stat.c	blk-stat: make q->stats->lock irqsafe	2020-09-01 16:48:46 -06:00
blk-stat.h	block: deactivate blk_stat timer in wbt_disable_default()	2018-12-12 06:47:51 -07:00
blk-sysfs.c	block: move the bdi from the request_queue to the gendisk	2021-08-09 11:53:23 -06:00
blk-throttle.c	blk-throtl: optimize IOPS throttle for large IO scenarios	2021-08-14 19:14:56 -06:00
blk-timeout.c	block: blk-timeout: delete duplicated word	2020-07-31 16:29:47 -06:00
blk-wbt.c	block: move the bdi from the request_queue to the gendisk	2021-08-09 11:53:23 -06:00
blk-wbt.h	blk-wbt: introduce a new disable state to prevent false positive by rwb_enabled()	2021-06-21 15:03:41 -06:00
blk-zoned.c	block: improve handling of all zones reset operation	2021-06-04 12:07:34 -04:00
blk.h	blk-throtl: optimize IOPS throttle for large IO scenarios	2021-08-14 19:14:56 -06:00
bounce.c	block: use memcpy_from_bvec in __blk_queue_bounce	2021-08-02 13:37:28 -06:00
bsg-lib.c	block-5.14-2021-07-08	2021-07-09 12:05:33 -07:00
bsg.c	block-5.14-2021-07-08	2021-07-09 12:05:33 -07:00
disk-events.c	block: add a helper to raise a media changed event	2021-08-02 13:37:28 -06:00
elevator.c	block: return ELEVATOR_DISCARD_MERGE if possible	2021-08-09 14:37:47 -06:00
genhd.c	block: ensure the bdi is freed after inode_detach_wb	2021-08-16 10:49:11 -06:00
holder.c	block: support delayed holder registration	2021-08-09 11:50:42 -06:00
ioctl.c	block: pass a gendisk to bdev_resize_partition	2021-08-12 10:31:36 -06:00
ioprio.c	block: Fix sys_ioprio_set(.which=IOPRIO_WHO_PGRP) task iteration	2021-04-08 13:43:53 -06:00
keyslot-manager.c	- Fix DM integrity's HMAC support to provide enhanced security of	2021-02-22 10:22:54 -08:00
kyber-iosched.c	kyber: fix out of bounds access when preempted	2021-05-11 08:12:14 -06:00
mq-deadline-cgroup.c	block/mq-deadline: Add cgroup support	2021-06-21 15:03:41 -06:00
mq-deadline-cgroup.h	block/mq-deadline: Add cgroup support	2021-06-21 15:03:41 -06:00
mq-deadline-main.c	block: return ELEVATOR_DISCARD_MERGE if possible	2021-08-09 14:37:47 -06:00
opal_proto.h	block: sed-opal: Change the check condition for regular session validity	2020-03-12 08:00:10 -06:00
scsi_ioctl.c	block-5.14-2021-07-08	2021-07-09 12:05:33 -07:00
sed-opal.c	block: sed-opal: Change the check condition for regular session validity	2020-03-12 08:00:10 -06:00
t10-pi.c	block: use bvec_kmap_local in t10_pi_type1_{prepare,complete}	2021-08-02 13:37:28 -06:00