Description
In the Linux kernel, the following vulnerability has been resolved: cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0 With len == 0 (clone to EOF), the effective length is computed as: len = src_inode->i_size - off; If off > i_size, this is a negative loff_t, corrupting the ByteCount in the FSCTL_DUPLICATE_EXTENTS_TO_FILE request and inverting the range in filemap_write_and_wait_range(). The existing off >= i_size check fires only after the ioctl has already been sent. Snapshot i_size_read() once for both the bounds check and the length calculation, eliminating the TOCTOU and 32-bit torn-read risk. Reject off > src_size with -EINVAL. Treat off == src_size as a no-op, consistent with __generic_remap_file_range_prep().
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
04b38d601239b4d9be641b412cf4b7456a041c67 to < 2c6eede83b3de1268db92c7e49741761c954aa26affected04b38d601239b4d9be641b412cf4b7456a041c67 to < ce813e5eebf46851e872ce59bdc34dc5dd4e29a4affected04b38d601239b4d9be641b412cf4b7456a041c67 to < f3d1ae1e6bc4a9f559185b6e7bd2b6375ec2fdd4affected04b38d601239b4d9be641b412cf4b7456a041c67 to < 7f62817fe049b0f3652518c1ba72631ec1e0a322affected04b38d601239b4d9be641b412cf4b7456a041c67 to < b098f5e5858797827666e6cd73033f52fc39b5f6affected04b38d601239b4d9be641b412cf4b7456a041c67 to < c2a0dcb5a7a1516aa6eb6d5cedca6a8e76527028affected04b38d601239b4d9be641b412cf4b7456a041c67 to < b057ca17b656345d04669cb87f2aff9b31d873dbaffected04b38d601239b4d9be641b412cf4b7456a041c67 to < 6c322f5cf7476ded7a9a20f7be72462065a03c68affected
Linux Linux
Default version status: affected
4.5affected0 to < 4.5unaffected5.10.273 to ≤ 5.10.*unaffected5.15.224 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/2c6eede83b3de1268db92c7e49741761c954aa26 ↗
- https://git.kernel.org/stable/c/ce813e5eebf46851e872ce59bdc34dc5dd4e29a4 ↗
- https://git.kernel.org/stable/c/f3d1ae1e6bc4a9f559185b6e7bd2b6375ec2fdd4 ↗
- https://git.kernel.org/stable/c/7f62817fe049b0f3652518c1ba72631ec1e0a322 ↗
- https://git.kernel.org/stable/c/b098f5e5858797827666e6cd73033f52fc39b5f6 ↗
- https://git.kernel.org/stable/c/c2a0dcb5a7a1516aa6eb6d5cedca6a8e76527028 ↗
- https://git.kernel.org/stable/c/b057ca17b656345d04669cb87f2aff9b31d873db ↗
- https://git.kernel.org/stable/c/6c322f5cf7476ded7a9a20f7be72462065a03c68 ↗