CVE-2023-52981 (GCVE-0-2023-52981)
Vulnerability from cvelistv5
Published
2025-03-27 16:43
Modified
2025-05-04 07:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/i915: Fix request ref counting during error capture & debugfs dump When GuC support was added to error capture, the reference counting around the request object was broken. Fix it up. The context based search manages the spinlocking around the search internally. So it needs to grab the reference count internally as well. The execlist only request based search relies on external locking, so it needs an external reference count but within the spinlock not outside it. The only other caller of the context based search is the code for dumping engine state to debugfs. That code wasn't previously getting an explicit reference at all as it does everything while holding the execlist specific spinlock. So, that needs updaing as well as that spinlock doesn't help when using GuC submission. Rather than trying to conditionally get/put depending on submission model, just change it to always do the get/put. v2: Explicitly document adding an extra blank line in some dense code (Andy Shevchenko). Fix multiple potential null pointer derefs in case of no request found (some spotted by Tvrtko, but there was more!). Also fix a leaked request in case of !started and another in __guc_reset_context now that intel_context_find_active_request is actually reference counting the returned request. v3: Add a _get suffix to intel_context_find_active_request now that it grabs a reference (Daniele). v4: Split the intel_guc_find_hung_context change to a separate patch and rename intel_context_find_active_request_get to intel_context_get_active_request (Tvrtko). v5: s/locking/reference counting/ in commit message (Tvrtko) (cherry picked from commit 3700e353781e27f1bc7222f51f2cc36cbeb9b4ec)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86d8ddc74124c3fdfc139f246ba6da15e45e86e3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9467397f417dd7b5d0db91452f0474e79716a527
Impacted products
Vendor Product Version
Linux Linux Version: 573ba126aef37c8315e5bb68d2dad515efa96994
Version: 573ba126aef37c8315e5bb68d2dad515efa96994
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   Linux Linux Version: 5.15
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/i915/gt/intel_context.c",
            "drivers/gpu/drm/i915/gt/intel_context.h",
            "drivers/gpu/drm/i915/gt/intel_engine_cs.c",
            "drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c",
            "drivers/gpu/drm/i915/i915_gpu_error.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            "drivers/gpu/drm/i915/gt/intel_context.h",
            "drivers/gpu/drm/i915/gt/intel_engine_cs.c",
            "drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c",
            "drivers/gpu/drm/i915/i915_gpu_error.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915: Fix request ref counting during error capture \u0026 debugfs dump\n\nWhen GuC support was added to error capture, the reference counting\naround the request object was broken. Fix it up.\n\nThe context based search manages the spinlocking around the search\ninternally. So it needs to grab the reference count internally as\nwell. The execlist only request based search relies on external\nlocking, so it needs an external reference count but within the\nspinlock not outside it.\n\nThe only other caller of the context based search is the code for\ndumping engine state to debugfs. That code wasn\u0027t previously getting\nan explicit reference at all as it does everything while holding the\nexeclist specific spinlock. So, that needs updaing as well as that\nspinlock doesn\u0027t help when using GuC submission. Rather than trying to\nconditionally get/put depending on submission model, just change it to\nalways do the get/put.\n\nv2: Explicitly document adding an extra blank line in some dense code\n(Andy Shevchenko). Fix multiple potential null pointer derefs in case\nof no request found (some spotted by Tvrtko, but there was more!).\nAlso fix a leaked request in case of !started and another in\n__guc_reset_context now that intel_context_find_active_request is\nactually reference counting the returned request.\nv3: Add a _get suffix to intel_context_find_active_request now that it\ngrabs a reference (Daniele).\nv4: Split the intel_guc_find_hung_context change to a separate patch\nand rename intel_context_find_active_request_get to\nintel_context_get_active_request (Tvrtko).\nv5: s/locking/reference counting/ in commit message (Tvrtko)\n\n(cherry picked from commit 3700e353781e27f1bc7222f51f2cc36cbeb9b4ec)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:46:46.399Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9467397f417dd7b5d0db91452f0474e79716a527"
        },
        {
          "url": "https://git.kernel.org/stable/c/86d8ddc74124c3fdfc139f246ba6da15e45e86e3"
        }
      ],
      "title": "drm/i915: Fix request ref counting during error capture \u0026 debugfs dump",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52981",
    "datePublished": "2025-03-27T16:43:20.111Z",
    "dateReserved": "2025-03-27T16:40:15.740Z",
    "dateUpdated": "2025-05-04T07:46:46.399Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52981\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-27T17:15:45.313\",\"lastModified\":\"2025-03-28T18:11:49.747\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/i915: Fix request ref counting during error capture \u0026 debugfs dump\\n\\nWhen GuC support was added to error capture, the reference counting\\naround the request object was broken. Fix it up.\\n\\nThe context based search manages the spinlocking around the search\\ninternally. So it needs to grab the reference count internally as\\nwell. The execlist only request based search relies on external\\nlocking, so it needs an external reference count but within the\\nspinlock not outside it.\\n\\nThe only other caller of the context based search is the code for\\ndumping engine state to debugfs. That code wasn\u0027t previously getting\\nan explicit reference at all as it does everything while holding the\\nexeclist specific spinlock. So, that needs updaing as well as that\\nspinlock doesn\u0027t help when using GuC submission. Rather than trying to\\nconditionally get/put depending on submission model, just change it to\\nalways do the get/put.\\n\\nv2: Explicitly document adding an extra blank line in some dense code\\n(Andy Shevchenko). Fix multiple potential null pointer derefs in case\\nof no request found (some spotted by Tvrtko, but there was more!).\\nAlso fix a leaked request in case of !started and another in\\n__guc_reset_context now that intel_context_find_active_request is\\nactually reference counting the returned request.\\nv3: Add a _get suffix to intel_context_find_active_request now that it\\ngrabs a reference (Daniele).\\nv4: Split the intel_guc_find_hung_context change to a separate patch\\nand rename intel_context_find_active_request_get to\\nintel_context_get_active_request (Tvrtko).\\nv5: s/locking/reference counting/ in commit message (Tvrtko)\\n\\n(cherry picked from commit 3700e353781e27f1bc7222f51f2cc36cbeb9b4ec)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/86d8ddc74124c3fdfc139f246ba6da15e45e86e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9467397f417dd7b5d0db91452f0474e79716a527\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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