GHSA-2CPC-3P3H-5RWQ
Vulnerability from github – Published: 2024-03-06 09:30 – Updated: 2024-10-31 18:31In 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]
{
"affected": [],
"aliases": [
"CVE-2024-26627"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-06T07:15:12Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Move scsi_host_busy() out of host lock for waking up EH handler\n\nInside scsi_eh_wakeup(), scsi_host_busy() is called \u0026 checked with host\nlock every time for deciding if error handler kthread needs to be waken up.\n\nThis can be too heavy in case of recovery, such as:\n\n - N hardware queues\n\n - queue depth is M for each hardware queue\n\n - each scsi_host_busy() iterates over (N * M) tag/requests\n\nIf recovery is triggered in case that all requests are in-flight, each\nscsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called\nfor the last in-flight request, scsi_host_busy() has been run for (N * M -\n1) times, and request has been iterated for (N*M - 1) * (N * M) times.\n\nIf both N and M are big enough, hard lockup can be triggered on acquiring\nhost lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169).\n\nFix the issue by calling scsi_host_busy() outside the host lock. We don\u0027t\nneed the host lock for getting busy count because host the lock never\ncovers that.\n\n[mkp: Drop unnecessary \u0027busy\u0027 variables pointed out by Bart]",
"id": "GHSA-2cpc-3p3h-5rwq",
"modified": "2024-10-31T18:31:15Z",
"published": "2024-03-06T09:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26627"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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