FKIE_CVE-2023-53777

Vulnerability from fkie_nvd - Published: 2025-12-09 01:16 - Updated: 2025-12-09 18:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: kill hooked chains to avoid loops on deduplicated compressed images After heavily stressing EROFS with several images which include a hand-crafted image of repeated patterns for more than 46 days, I found two chains could be linked with each other almost simultaneously and form a loop so that the entire loop won't be submitted. As a consequence, the corresponding file pages will remain locked forever. It can be _only_ observed on data-deduplicated compressed images. For example, consider two chains with five pclusters in total: Chain 1: 2->3->4->5 -- The tail pcluster is 5; Chain 2: 5->1->2 -- The tail pcluster is 2. Chain 2 could link to Chain 1 with pcluster 5; and Chain 1 could link to Chain 2 at the same time with pcluster 2. Since hooked chains are all linked locklessly now, I have no idea how to simply avoid the race. Instead, let's avoid hooked chains completely until I could work out a proper way to fix this and end users finally tell us that it's needed to add it back. Actually, this optimization can be found with multi-threaded workloads (especially even more often on deduplicated compressed images), yet I'm not sure about the overall system impacts of not having this compared with implementation complexity.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10c2b98a40d9044a3e97f4697ca6213bad7e19c2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/967c28b23f6c89bb8eef6a046ea88afe0d7c1029
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5b0d52f00e4bacb0ebdf47cd7016b0485fffad2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3b39ea24835ac03da1a30f93ae7c05d55a40191
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: kill hooked chains to avoid loops on deduplicated compressed images\n\nAfter heavily stressing EROFS with several images which include a\nhand-crafted image of repeated patterns for more than 46 days, I found\ntwo chains could be linked with each other almost simultaneously and\nform a loop so that the entire loop won\u0027t be submitted.  As a\nconsequence, the corresponding file pages will remain locked forever.\n\nIt can be _only_ observed on data-deduplicated compressed images.\nFor example, consider two chains with five pclusters in total:\n\tChain 1:  2-\u003e3-\u003e4-\u003e5    -- The tail pcluster is 5;\n        Chain 2:  5-\u003e1-\u003e2       -- The tail pcluster is 2.\n\nChain 2 could link to Chain 1 with pcluster 5; and Chain 1 could link\nto Chain 2 at the same time with pcluster 2.\n\nSince hooked chains are all linked locklessly now, I have no idea how\nto simply avoid the race.  Instead, let\u0027s avoid hooked chains completely\nuntil I could work out a proper way to fix this and end users finally\ntell us that it\u0027s needed to add it back.\n\nActually, this optimization can be found with multi-threaded workloads\n(especially even more often on deduplicated compressed images), yet I\u0027m\nnot sure about the overall system impacts of not having this compared\nwith implementation complexity."
    }
  ],
  "id": "CVE-2023-53777",
  "lastModified": "2025-12-09T18:37:13.640",
  "metrics": {},
  "published": "2025-12-09T01:16:48.753",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/10c2b98a40d9044a3e97f4697ca6213bad7e19c2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/967c28b23f6c89bb8eef6a046ea88afe0d7c1029"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b5b0d52f00e4bacb0ebdf47cd7016b0485fffad2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d3b39ea24835ac03da1a30f93ae7c05d55a40191"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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