Description
In the Linux kernel, the following vulnerability has been resolved: comedi: dt2815: add hardware detection to prevent crash The dt2815 driver crashes when attached to I/O ports without actual hardware present. This occurs because syzkaller or users can attach the driver to arbitrary I/O addresses via COMEDI_DEVCONFIG ioctl. When no hardware exists at the specified port, inb() operations return 0xff (floating bus), but outb() operations can trigger page faults due to undefined behavior, especially under race conditions: BUG: unable to handle page fault for address: 000000007fffff90 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page RIP: 0010:dt2815_attach+0x6e0/0x1110 Add hardware detection by reading the status register before attempting any write operations. If the read returns 0xff, assume no hardware is present and fail the attach with -ENODEV. This prevents crashes from outb() operations on non-existent hardware.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d6a929b7608ae157cef86d00cc580d1038f0b985 to < 8d63161837f1bf8810dbcd2a583c2bbf5ca6d733affectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < d2a786efdb9971f2a647724625da5bbecc994dc9affectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < 0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3affectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < d5d9df8b08d68d083ac57abc2c887dfb1f31af63affectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < 65c528fbeddd88478c210052f6c7b21be4973156affectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < 34c8b3a91bdfbe4573650b4cd750ef639101fdc5affectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < 34b13250c618d7441508c6ef369144aa8a9b9bfaaffectedd6a929b7608ae157cef86d00cc580d1038f0b985 to < 93853512f565e625df2397f0d8050d6aafd7c3adaffected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.168 to ≤ 6.1.*unaffected6.6.134 to ≤ 6.6.*unaffected6.12.81 to ≤ 6.12.*unaffected6.18.22 to ≤ 6.18.*unaffected6.19.12 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733 ↗
- https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9 ↗
- https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3 ↗
- https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63 ↗
- https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156 ↗
- https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5 ↗
- https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa ↗
- https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad ↗