cve-2024-47740
Vulnerability from cvelistv5
Published
2024-10-21 12:14
Modified
2024-12-19 09:27
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/000bab8753ae29a259feb339b99ee759795a48ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32f348ecc149e9ca70a1c424ae8fa9b6919d2713
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4583290898c13c2c2e5eb8773886d153c2c5121d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ce87674c3a6b4d3b3d45f85b584ab8618a3cece
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f5a100f87f32cb65d4bb1ad282a08c92f6f591e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e0de753bfe87768ebe6744d869caa92f35e5731
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88ff021e1fea2d9b40b2d5efd9013c89f7be04ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95302f32d
Impacted products
Vendor Product Version
Linux Linux Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
Version: 88b88a66797159949cec32eaab12b4968f6fae2d
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   Linux Linux Version: 3.18
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\"https://git.kernel.org/stable/c/4ce87674c3a6b4d3b3d45f85b584ab8618a3cece\"}, {\"url\": \"https://git.kernel.org/stable/c/000bab8753ae29a259feb339b99ee759795a48ac\"}, {\"url\": \"https://git.kernel.org/stable/c/88ff021e1fea2d9b40b2d5efd9013c89f7be04ac\"}, {\"url\": \"https://git.kernel.org/stable/c/32f348ecc149e9ca70a1c424ae8fa9b6919d2713\"}, {\"url\": \"https://git.kernel.org/stable/c/5e0de753bfe87768ebe6744d869caa92f35e5731\"}, {\"url\": \"https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95302f32d\"}, {\"url\": \"https://git.kernel.org/stable/c/4583290898c13c2c2e5eb8773886d153c2c5121d\"}, {\"url\": \"https://git.kernel.org/stable/c/4f5a100f87f32cb65d4bb1ad282a08c92f6f591e\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: Require FMODE_WRITE for atomic write ioctls\\n\\nThe F2FS ioctls for starting and committing atomic writes check for\\ninode_owner_or_capable(), but this does not give LSMs like SELinux or\\nLandlock an opportunity to deny the write access - if the caller\u0027s FSUID\\nmatches the inode\u0027s UID, inode_owner_or_capable() immediately returns true.\\n\\nThere are scenarios where LSMs want to deny a process the ability to write\\nparticular files, even files that the FSUID of the process owns; but this\\ncan currently partially be bypassed using atomic write ioctls in two ways:\\n\\n - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can\\n   truncate an inode to size 0\\n - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert\\n   changes another process concurrently made to a file\\n\\nFix it by requiring FMODE_WRITE for these operations, just like for\\nF2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these\\nioctls when intending to write into the file, that seems unlikely to break\\nanything.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:27:10.188Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-47740\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:27:10.188Z\", \"dateReserved\": \"2024-09-30T16:00:12.959Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T12:14:09.171Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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