ghsa-8wrm-f3cq-6c93
Vulnerability from github
Published
2024-06-24 15:31
Modified
2024-06-24 15:31
Details

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

f2fs: compress: don't allow unaligned truncation on released compress inode

f2fs image may be corrupted after below testcase: - mkfs.f2fs -O extra_attr,compression -f /dev/vdb - mount /dev/vdb /mnt/f2fs - touch /mnt/f2fs/file - f2fs_io setflags compression /mnt/f2fs/file - dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4 - f2fs_io release_cblocks /mnt/f2fs/file - truncate -s 8192 /mnt/f2fs/file - umount /mnt/f2fs - fsck.f2fs /dev/vdb

[ASSERT] (fsck_chk_inode_blk:1256) --> ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks [FSCK] valid_block_count matching with CP [Fail] [0x4, 0x5] [FSCK] other corrupted bugs [Fail]

The reason is: partial truncation assume compressed inode has reserved blocks, after partial truncation, valid block count may change w/o .i_blocks and .total_valid_block_count update, result in corruption.

This patch only allow cluster size aligned truncation on released compress inode for fixing.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-33847"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-24T14:15:11Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: compress: don\u0027t allow unaligned truncation on released compress inode\n\nf2fs image may be corrupted after below testcase:\n- mkfs.f2fs -O extra_attr,compression -f /dev/vdb\n- mount /dev/vdb /mnt/f2fs\n- touch /mnt/f2fs/file\n- f2fs_io setflags compression /mnt/f2fs/file\n- dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4\n- f2fs_io release_cblocks /mnt/f2fs/file\n- truncate -s 8192 /mnt/f2fs/file\n- umount /mnt/f2fs\n- fsck.f2fs /dev/vdb\n\n[ASSERT] (fsck_chk_inode_blk:1256)  --\u003e ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks\n[FSCK] valid_block_count matching with CP             [Fail] [0x4, 0x5]\n[FSCK] other corrupted bugs                           [Fail]\n\nThe reason is: partial truncation assume compressed inode has reserved\nblocks, after partial truncation, valid block count may change w/o\n.i_blocks and .total_valid_block_count update, result in corruption.\n\nThis patch only allow cluster size aligned truncation on released\ncompress inode for fixing.",
  "id": "GHSA-8wrm-f3cq-6c93",
  "modified": "2024-06-24T15:31:44Z",
  "published": "2024-06-24T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-33847"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29ed2b5dd521ce7c5d8466cd70bf0cc9d07afeee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ccf5210dc941a7aa0180596ac021568be4d35ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5268241b41b1c5d0acca75e9b97d4fd719251c8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8acae047215024d1ac499b3c8337ef1b952f160b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f9341064a9b5246a32a7fe56b9f80c6f7f3c62d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8962cf98595d1ec62f40f23667de830567ec8bc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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