github - ghsa-q2gx-5vc4-pjjw

GHSA-Q2GX-5VC4-PJJW

Vulnerability from github – Published: 2024-09-04 21:30 – Updated: 2024-09-06 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/xe/preempt_fence: enlarge the fence critical section

It is really easy to introduce subtle deadlocks in preempt_fence_work_func() since we operate on single global ordered-wq for signalling our preempt fences behind the scenes, so even though we signal a particular fence, everything in the callback should be in the fence critical section, since blocking in the callback will prevent other published fences from signalling. If we enlarge the fence critical section to cover the entire callback, then lockdep should be able to understand this better, and complain if we grab a sensitive lock like vm->lock, which is also held when waiting on preempt fences.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-44956"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-04T19:15:30Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/preempt_fence: enlarge the fence critical section\n\nIt is really easy to introduce subtle deadlocks in\npreempt_fence_work_func() since we operate on single global ordered-wq\nfor signalling our preempt fences behind the scenes, so even though we\nsignal a particular fence, everything in the callback should be in the\nfence critical section, since blocking in the callback will prevent\nother published fences from signalling. If we enlarge the fence critical\nsection to cover the entire callback, then lockdep should be able to\nunderstand this better, and complain if we grab a sensitive lock like\nvm-\u003elock, which is also held when waiting on preempt fences.",
  "id": "GHSA-q2gx-5vc4-pjjw",
  "modified": "2024-09-06T18:31:28Z",
  "published": "2024-09-04T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44956"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cd1585e57908b6efcd967465ef7685f40b2a294"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/458bb83119dfee5d14c677f7846dd9363817006f"
    }
  ],
  "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"
    }
  ]
}

CVE-2024-44956 (GCVE-0-2024-44956)

Vulnerability from cvelistv5 – Published: 2024-09-04 18:35 – Updated: 2025-05-04 09:29

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/xe/preempt_fence: enlarge the fence critical section It is really easy to introduce subtle deadlocks in preempt_fence_work_func() since we operate on single global ordered-wq for signalling our preempt fences behind the scenes, so even though we signal a particular fence, everything in the callback should be in the fence critical section, since blocking in the callback will prevent other published fences from signalling. If we enlarge the fence critical section to cover the entire callback, then lockdep should be able to understand this better, and complain if we grab a sensitive lock like vm->lock, which is also held when waiting on preempt fences.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/458bb83119dfee5d1…
	https://git.kernel.org/stable/c/3cd1585e57908b6ef…

Impacted products

Vendor

Product

Version

Linux

Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 458bb83119dfee5d14c677f7846dd9363817006f (git)
Affected: dd08ebf6c3525a7ea2186e636df064ea47281987 , < 3cd1585e57908b6efcd967465ef7685f40b2a294 (git)

Linux

Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.10.5 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)

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        "metrics": [
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                "id": "CVE-2024-44956",
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T17:40:03.841681Z",
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-Q2GX-5VC4-PJJW

CVE-2024-44956 (GCVE-0-2024-44956)

Tags

Sightings

Nomenclature