Tejun Heo 2a427b49d0 blk-iocost: Fix an UBSAN shift-out-of-bounds warning ... When iocg_kick_delay() is called from a CPU different than the one which set the delay, @now may be in the past of @iocg->delay_at leading to the following warning: UBSAN: shift-out-of-bounds in block/blk-iocost.c:1359:23 shift exponent 18446744073709 is too large for 64-bit type 'u64' (aka 'unsigned long long') ... Call Trace: <TASK> dump_stack_lvl+0x79/0xc0 __ubsan_handle_shift_out_of_bounds+0x2ab/0x300 iocg_kick_delay+0x222/0x230 ioc_rqos_merge+0x1d7/0x2c0 __rq_qos_merge+0x2c/0x80 bio_attempt_back_merge+0x83/0x190 blk_attempt_plug_merge+0x101/0x150 blk_mq_submit_bio+0x2b1/0x720 submit_bio_noacct_nocheck+0x320/0x3e0 __swap_writepage+0x2ab/0x9d0 The underflow itself doesn't really affect the behavior in any meaningful way; however, the past timestamp may exaggerate the delay amount calculated later in the code, which shouldn't be a material problem given the nature of the delay mechanism. If @now is in the past, this CPU is racing another CPU which recently set up the delay and there's nothing this CPU can contribute w.r.t. the delay. Let's bail early from iocg_kick_delay() in such cases. Reported-by: Breno Leitão <leitao@debian.org> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: 5160a5a53c ("blk-iocost: implement delay adjustment hysteresis") Link: https://lore.kernel.org/r/ZVvc9L_CYk5LO1fT@slm.duckdns.org Signed-off-by: Jens Axboe <axboe@kernel.dk>		2024-02-08 10:11:39 -07:00
..
partitions	block: Move checking GENHD_FL_NO_PART to bdev_add_partition()	2024-01-22 09:51:29 -07:00
Kconfig	block: Add config option to not allow writing to mounted devices	2023-11-18 14:59:25 +01:00
Kconfig.iosched	block: Default to use cgroup support for BFQ	2023-01-30 09:42:42 -07:00
Makefile	block: move the code to do early boot lookup of block devices to block/	2023-06-05 10:57:40 -06:00
badblocks.c	badblocks: avoid checking invalid range in badblocks_check()	2023-12-23 18:38:08 -07:00
bdev.c	vfs-6.8.super	2024-01-08 10:43:51 -08:00
bfq-cgroup.c	blkcg: Restructure blkg_conf_prep() and friends	2023-04-13 06:46:49 -06:00
bfq-iosched.c	SCSI misc on 20230629	2023-06-30 11:57:07 -07:00
bfq-iosched.h	block, bfq: remove BFQ_WEIGHT_LEGACY_DFL	2023-04-06 16:17:32 -06:00
bfq-wf2q.c	block, bfq: inject I/O to underutilized actuators	2023-01-29 15:18:33 -07:00
bio-integrity.c	block: bio-integrity: fix kcalloc() arguments order	2024-01-16 09:51:22 -07:00
bio.c	block: support adding less than len in bio_add_hw_page	2023-12-15 07:34:27 -07:00
blk-cgroup-fc-appid.c	block: Replace all non-returning strlcpy with strscpy	2023-06-01 09:13:31 -06:00
blk-cgroup-rwstat.c	Revert "blk-cgroup: pin the gendisk in struct blkcg_gq"	2023-02-14 14:24:09 -07:00
blk-cgroup-rwstat.h	…
blk-cgroup.c	block: Correct a documentation comment in blk-cgroup.c	2024-01-15 07:23:38 -07:00
blk-cgroup.h	blk-cgroup: fix rcu lockdep warning in blkg_lookup()	2024-01-04 16:08:54 -07:00
blk-core.c	block: Fix where bio IO priority gets set	2024-02-01 11:00:06 -07:00
blk-crypto-fallback.c	blk-crypto: dynamically allocate fallback profile	2023-08-18 15:00:39 -06:00
blk-crypto-internal.h	blk-crypto: remove blk_crypto_insert_cloned_request()	2023-03-16 09:35:09 -06:00
blk-crypto-profile.c	blk-crypto: use dynamic lock class for blk_crypto_profile::lock	2023-07-05 16:36:12 -06:00
blk-crypto-sysfs.c	block: make kobj_type structures constant	2023-02-09 09:38:16 -07:00
blk-crypto.c	blk-crypto: make blk_crypto_evict_key() more robust	2023-03-16 09:35:09 -06:00
blk-flush.c	blk-mq: remove RQF_MQ_INFLIGHT	2023-09-22 08:52:13 -06:00
blk-ia-ranges.c	block: make kobj_type structures constant	2023-02-09 09:38:16 -07:00
blk-integrity.c	blk-integrity: register sysfs attributes on struct device	2023-04-26 18:22:50 -06:00
blk-ioc.c	blk-ioc: fix recursive spin_lock/unlock_irq() in ioc_clear_queue()	2023-06-07 07:51:00 -06:00
blk-iocost.c	blk-iocost: Fix an UBSAN shift-out-of-bounds warning	2024-02-08 10:11:39 -07:00
blk-iolatency.c	block: fix bad lockdep annotation in blk-iolatency	2023-08-10 17:24:53 -06:00
blk-ioprio.c	blk-ioprio: Introduce promote-to-rt policy	2023-06-06 22:26:26 -06:00
blk-ioprio.h	blk-ioprio: pass a gendisk to blk_ioprio_init and blk_ioprio_exit	2022-09-26 19:09:31 -06:00
blk-lib.c	blk-lib: fix blkdev_issue_secure_erase	2022-09-15 00:25:17 -06:00
blk-map.c	block: Fix WARNING in _copy_from_iter	2024-01-23 08:56:55 -07:00
blk-merge.c	block: remove two comments in bio_split_discard	2023-12-29 08:44:12 -07:00
blk-mq-cpumap.c	blk-mq: include <linux/blk-mq.h> in block/blk-mq.h	2023-04-13 06:52:29 -06:00
blk-mq-debugfs-zoned.c	…
blk-mq-debugfs.c	blk-mq: Remove the hctx 'run' debugfs attribute	2024-01-17 14:16:34 -07:00
blk-mq-debugfs.h	…
blk-mq-pci.c	blk-mq: include <linux/blk-mq.h> in block/blk-mq.h	2023-04-13 06:52:29 -06:00
blk-mq-sched.c	blk-mq: Remove the hctx 'run' debugfs attribute	2024-01-17 14:16:34 -07:00
blk-mq-sched.h	blk-mq: make sure elevator callbacks aren't called for passthrough request	2023-05-18 19:42:54 -06:00
blk-mq-sysfs.c	blk-mq: include <linux/blk-mq.h> in block/blk-mq.h	2023-04-13 06:52:29 -06:00
blk-mq-tag.c	for-6.5/block-2023-06-23	2023-06-26 12:47:20 -07:00
blk-mq-virtio.c	blk-mq: include <linux/blk-mq.h> in block/blk-mq.h	2023-04-13 06:52:29 -06:00
blk-mq.c	block: Fix where bio IO priority gets set	2024-02-01 11:00:06 -07:00
blk-mq.h	blk-mq: update driver tags request table when start request	2023-09-22 08:52:13 -06:00
blk-pm.c	block: Remove blk_set_runtime_active()	2023-11-20 10:22:40 -07:00
blk-pm.h	…
blk-rq-qos.c	block: correct stale comment in rq_qos_wait	2023-09-18 14:15:28 -06:00
blk-rq-qos.h	block: skip QUEUE_FLAG_STATS and rq-qos for passthrough io	2023-12-01 18:29:18 -07:00
blk-settings.c	block: floor the discard granularity to the physical block size	2024-01-04 16:05:49 -07:00
blk-stat.c	blk-mq: include <linux/blk-mq.h> in block/blk-mq.h	2023-04-13 06:52:29 -06:00
blk-stat.h	…
blk-sysfs.c	for-6.8/block-2024-01-08	2024-01-11 13:58:04 -08:00
blk-throttle.c	blk-throttle: fix lockdep warning of "cgroup_mutex or RCU read lock required!"	2023-11-17 10:48:58 -07:00
blk-throttle.h	blk-throttle: print signed value 'carryover_bytes/ios' for user	2023-08-30 10:15:01 -06:00
blk-timeout.c	…
blk-wbt.c	blk-wbt: Fix detection of dirty-throttled tasks	2024-02-06 09:44:03 -07:00
blk-wbt.h	blk-wbt: remove the separate write cache tracking	2023-12-26 09:28:10 -07:00
blk-zoned.c	block: Treat sequential write preferred zone type as invalid	2024-01-08 08:34:24 -07:00
blk.h	block: simplify disk_set_zoned	2023-12-19 20:17:43 -07:00
bounce.c	…
bsg-lib.c	scsi: replace the fmode_t argument to ->sg_io_fn with a simple bool	2023-06-12 08:04:04 -06:00
bsg.c	SCSI misc on 20230629	2023-06-30 11:57:07 -07:00
disk-events.c	block: move bdev_mark_dead out of disk_check_media_change	2023-10-28 13:29:23 +02:00
early-lookup.c	block: don't return -EINVAL for not found names in devt_from_devname	2023-06-22 09:09:33 -06:00
elevator.c	blk-mq: release scheduler resource when request completes	2023-08-19 07:47:17 -06:00
elevator.h	blk-mq: pass a flags argument to elevator_type->insert_requests	2023-04-13 06:52:30 -06:00
fops.c	fs: convert block_write_full_page to block_write_full_folio	2023-12-29 11:58:35 -08:00
genhd.c	block: add check of 'minors' and 'first_minor' in device_add_disk()	2023-12-19 08:23:12 -07:00
holder.c	block: don't allow a disk link holder to itself	2022-11-16 15:19:56 -07:00
ioctl.c	block: Move checking GENHD_FL_NO_PART to bdev_add_partition()	2024-01-22 09:51:29 -07:00
ioprio.c	block: move __get_task_ioprio() into header file	2024-01-08 12:27:39 -07:00
kyber-iosched.c	blk-mq: pass a flags argument to elevator_type->insert_requests	2023-04-13 06:52:30 -06:00
mq-deadline.c	block/mq-deadline: use correct way to throttling write requests	2023-08-08 15:46:41 -06:00
opal_proto.h	block: sed-opal: Implement IOC_OPAL_REVERT_LSP	2023-08-22 11:10:26 -06:00
sed-opal.c	for-6.7/block-2023-10-30	2023-11-01 12:30:07 -10:00
t10-pi.c	…