blk-mq: fix IO hang from sbitmap wakeup race (Linux Linux)

CVE-2024-26671
MEDIUM 4.7

At a glance

Source
NVD
EPSS
EPSS 0.19 % · percentile 8 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix IO hang from sbitmap wakeup race In blk_mq_mark_tag_wait(), __add_wait_queue() may be re-ordered with the following blk_mq_get_driver_tag() in case of getting driver tag failure. Then in __sbitmap_queue_wake_up(), waitqueue_active() may not observe the added waiter in blk_mq_mark_tag_wait() and wake up nothing, meantime blk_mq_mark_tag_wait() can't get driver tag successfully. This issue can be reproduced by running the following test in loop, and fio hang can be observed in < 30min when running it on my test VM in laptop. modprobe -r scsi_debug modprobe scsi_debug delay=0 dev_size_mb=4096 max_queue=1 host_max_queue=1 submit_queues=4 dev=`ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block/* | head -1 | xargs basename` fio --filename=/dev/"$dev" --direct=1 --rw=randrw --bs=4k --iodepth=1 \ --runtime=100 --numjobs=40 --time_based --name=test \ --ioengine=libaio Fix the issue by adding one explicit barrier in blk_mq_mark_tag_wait(), which is just fine in case of running out of tag.

Weaknesses (CWE)

  • CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization

References

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected da55f2cc78418dee88400aafbbaed19d7ac8188e < 9525b38180e2753f0daa1a522b7767a2aa969676 ; affected da55f2cc78418dee88400aafbbaed19d7ac8188e < ecd7744a1446eb02ccc63e493e2eb6ede4ef1e10 ; affected da55f2cc78418dee88400aafbbaed19d7ac8188e < 7610ba1319253225a9ba8a9d28d472fc883b4e2f ; affected da55f2cc78418dee88400aafbbaed19d7ac8188e < 89e0e66682e1538aeeaa3109503473663cd24c8b ; affected da55f2cc78418dee88400aafbbaed19d7ac8188e < 1d9c777d3e70bdc57dddf7a14a80059d65919e56 ; affected da55f2cc78418dee88400aafbbaed19d7ac8188e < 6d8b01624a2540336a32be91f25187a433af53a0
Linux · Linuxaffected 4.11 ; unaffected 0 < 4.11 ; unaffected 4.19.307 ≤ 4.19.* ; unaffected 5.4.269 ≤ 5.4.* ; unaffected 5.10.210 ≤ 5.10.* ; unaffected 5.15.149 ≤ 5.15.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD