ghsa-rr8j-q4x4-g24r
Vulnerability from github
Published
2024-05-01 15:30
Modified
2024-11-01 18:31
Severity ?
4.7 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Details

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

tmpfs: fix race on handling dquot rbtree

A syzkaller reproducer found a race while attempting to remove dquot information from the rb tree.

Fetching the rb_tree root node must also be protected by the dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot() will trigger a warning because it couldn't find a node in the tree, when the real reason was the root node changing before the search starts:

Thread 1 Thread 2 - shmem_release_dquot() - shmem_{acquire,release}_dquot()

  • fetch ROOT - Fetch ROOT

                - acquire dqio_sem
    • wait dqio_sem
              - do something, triger a tree rebalance
        - release dqio_sem

  • acquire dqio_sem

  • start searching for the node, but from the wrong location, missing the node, and triggering a warning.
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{
  "affected": [],
  "aliases": [
    "CVE-2024-27058"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-01T13:15:50Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntmpfs: fix race on handling dquot rbtree\n\nA syzkaller reproducer found a race while attempting to remove dquot\ninformation from the rb tree.\n\nFetching the rb_tree root node must also be protected by the\ndqopt-\u003edqio_sem, otherwise, giving the right timing, shmem_release_dquot()\nwill trigger a warning because it couldn\u0027t find a node in the tree, when\nthe real reason was the root node changing before the search starts:\n\nThread 1\t\t\t\tThread 2\n- shmem_release_dquot()\t\t\t- shmem_{acquire,release}_dquot()\n\n- fetch ROOT\t\t\t\t- Fetch ROOT\n\n\t\t\t\t\t- acquire dqio_sem\n- wait dqio_sem\n\n\t\t\t\t\t- do something, triger a tree rebalance\n\t\t\t\t\t- release dqio_sem\n\n- acquire dqio_sem\n- start searching for the node, but\n  from the wrong location, missing\n  the node, and triggering a warning.",
  "id": "GHSA-rr8j-q4x4-g24r",
  "modified": "2024-11-01T18:31:25Z",
  "published": "2024-05-01T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27058"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}


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