ghsa-h8c3-hrx9-cf8g
Vulnerability from github
Published
2024-05-01 06:31
Modified
2024-06-27 12:30
Details

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

nilfs2: fix OOB in nilfs_set_de_type

The size of the nilfs_type_by_mode array in the fs/nilfs2/dir.c file is defined as "S_IFMT >> S_SHIFT", but the nilfs_set_de_type() function, which uses this array, specifies the index to read from the array in the same way as "(mode & S_IFMT) >> S_SHIFT".

static void nilfs_set_de_type(struct nilfs_dir_entry de, struct inode inode) { umode_t mode = inode->i_mode;

de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; // oob

}

However, when the index is determined this way, an out-of-bounds (OOB) error occurs by referring to an index that is 1 larger than the array size when the condition "mode & S_IFMT == S_IFMT" is satisfied. Therefore, a patch to resize the nilfs_type_by_mode array should be applied to prevent OOB errors.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-26981"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-01T06:15:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix OOB in nilfs_set_de_type\n\nThe size of the nilfs_type_by_mode array in the fs/nilfs2/dir.c file is\ndefined as \"S_IFMT \u003e\u003e S_SHIFT\", but the nilfs_set_de_type() function,\nwhich uses this array, specifies the index to read from the array in the\nsame way as \"(mode \u0026 S_IFMT) \u003e\u003e S_SHIFT\".\n\nstatic void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode\n *inode)\n{\n\tumode_t mode = inode-\u003ei_mode;\n\n\tde-\u003efile_type = nilfs_type_by_mode[(mode \u0026 S_IFMT)\u003e\u003eS_SHIFT]; // oob\n}\n\nHowever, when the index is determined this way, an out-of-bounds (OOB)\nerror occurs by referring to an index that is 1 larger than the array size\nwhen the condition \"mode \u0026 S_IFMT == S_IFMT\" is satisfied.  Therefore, a\npatch to resize the nilfs_type_by_mode array should be applied to prevent\nOOB errors.",
  "id": "GHSA-h8c3-hrx9-cf8g",
  "modified": "2024-06-27T12:30:45Z",
  "published": "2024-05-01T06:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26981"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/054f29e9ca05be3906544c5f2a2c7321c30a4243"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2382eae66b196c31893984a538908c3eb7506ff9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7061c7efbb9e8f11ce92d6b4646405ea2b0b4de1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/897ac5306bbeb83e90c437326f7044c79a17c611"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90823f8d9ecca3d5fa6b102c8e464c62f416975f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90f43980ea6be4ad903e389be9a27a2a0018f1c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdbe483da21f852c93b22557b146bc4d989260f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4a7dc9523b59b3e73fd522c73e95e072f876b16"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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