fkie_cve-2023-53172
Vulnerability from fkie_nvd
Published
2025-09-15 14:15
Modified
2025-09-15 15:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fsverity: reject FS_IOC_ENABLE_VERITY on mode 3 fds Commit 56124d6c87fd ("fsverity: support enabling with tree block size < PAGE_SIZE") changed FS_IOC_ENABLE_VERITY to use __kernel_read() to read the file's data, instead of direct pagecache accesses. An unintended consequence of this is that the 'WARN_ON_ONCE(!(file->f_mode & FMODE_READ))' in __kernel_read() became reachable by fuzz tests. This happens if FS_IOC_ENABLE_VERITY is called on a fd opened with access mode 3, which means "ioctl access only". Arguably, FS_IOC_ENABLE_VERITY should work on ioctl-only fds. But ioctl-only fds are a weird Linux extension that is rarely used and that few people even know about. (The documentation for FS_IOC_ENABLE_VERITY even specifically says it requires O_RDONLY.) It's probably not worthwhile to make the ioctl internally open a new fd just to handle this case. Thus, just reject the ioctl on such fds for now.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04839139213cf60d4c5fc792214a08830e294ff8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85c039cff3c359967cafe90443c02321e950b216
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\nfsverity: reject FS_IOC_ENABLE_VERITY on mode 3 fds\n\nCommit 56124d6c87fd (\"fsverity: support enabling with tree block size \u003c\nPAGE_SIZE\") changed FS_IOC_ENABLE_VERITY to use __kernel_read() to read\nthe file\u0027s data, instead of direct pagecache accesses.\n\nAn unintended consequence of this is that the\n\u0027WARN_ON_ONCE(!(file-\u003ef_mode \u0026 FMODE_READ))\u0027 in __kernel_read() became\nreachable by fuzz tests.  This happens if FS_IOC_ENABLE_VERITY is called\non a fd opened with access mode 3, which means \"ioctl access only\".\n\nArguably, FS_IOC_ENABLE_VERITY should work on ioctl-only fds.  But\nioctl-only fds are a weird Linux extension that is rarely used and that\nfew people even know about.  (The documentation for FS_IOC_ENABLE_VERITY\neven specifically says it requires O_RDONLY.)  It\u0027s probably not\nworthwhile to make the ioctl internally open a new fd just to handle\nthis case.  Thus, just reject the ioctl on such fds for now."
    }
  ],
  "id": "CVE-2023-53172",
  "lastModified": "2025-09-15T15:22:27.090",
  "metrics": {},
  "published": "2025-09-15T14:15:39.057",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/04839139213cf60d4c5fc792214a08830e294ff8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/85c039cff3c359967cafe90443c02321e950b216"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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