cve-2024-26627
Vulnerability from cvelistv5
Published
2024-03-06 06:45
Modified
2024-12-19 08:43
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler Inside scsi_eh_wakeup(), scsi_host_busy() is called & checked with host lock every time for deciding if error handler kthread needs to be waken up. This can be too heavy in case of recovery, such as: - N hardware queues - queue depth is M for each hardware queue - each scsi_host_busy() iterates over (N * M) tag/requests If recovery is triggered in case that all requests are in-flight, each scsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called for the last in-flight request, scsi_host_busy() has been run for (N * M - 1) times, and request has been iterated for (N*M - 1) * (N * M) times. If both N and M are big enough, hard lockup can be triggered on acquiring host lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169). Fix the issue by calling scsi_host_busy() outside the host lock. We don't need the host lock for getting busy count because host the lock never covers that. [mkp: Drop unnecessary 'busy' variables pointed out by Bart]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
Vendor Product Version
Linux Linux Version: 5.5
Show details on NVD website

To clipboard 

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}


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