Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix out-of-bounds write in ocfs2_write_end_inline KASAN reports a use-after-free write of 4086 bytes in ocfs2_write_end_inline, called from ocfs2_write_end_nolock during a copy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on a loop device. The actual bug is an out-of-bounds write past the inode block buffer, not a true use-after-free. The write overflows into an adjacent freed page, which KASAN reports as UAF. The root cause is that ocfs2_try_to_write_inline_data trusts the on-disk id_count field to determine whether a write fits in inline data. On a corrupted filesystem, id_count can exceed the physical maximum inline data capacity, causing writes to overflow the inode block buffer. Call trace (crash path): vfs_copy_file_range (fs/read_write.c:1634) do_splice_direct splice_direct_to_actor iter_file_splice_write ocfs2_file_write_iter generic_perform_write ocfs2_write_end ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949) ocfs2_write_end_inline (fs/ocfs2/aops.c:1915) memcpy_from_folio <-- KASAN: write OOB So add id_count upper bound check in ocfs2_validate_inode_block() to alongside the existing i_size check to fix it.
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
1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 68f9cc3bbf2ae501770cea7dc0005fc9a85e48eaaffected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 2e6a254f9cedf51b75cc20b8b92e2209bfa04c3eaffected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 22df7d4de9c5cd42edf855a1de25f2106088c4c6affected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < e2c9dc6b6e96f3585f2a1062ca3374a52db0938faffected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 947f953978b0d9463498d548d0f054f5a75be2e9affected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 0c1af902223b6fcedb60904ca0b551254686c7b9affected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 69d3c69ade1e4285ab4ca48fe7acee0767e65604affected1afc32b952335f665327a1a9001ba1b44bb76fd9 to < 7bc5da4842bed3252d26e742213741a4d0ac1b14affected
Linux Linux
Default version status: affected
2.6.24affected0 to < 2.6.24unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.136 to ≤ 6.6.*unaffected6.12.83 to ≤ 6.12.*unaffected6.18.24 to ≤ 6.18.*unaffected6.19.14 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/68f9cc3bbf2ae501770cea7dc0005fc9a85e48ea ↗
- https://git.kernel.org/stable/c/2e6a254f9cedf51b75cc20b8b92e2209bfa04c3e ↗
- https://git.kernel.org/stable/c/22df7d4de9c5cd42edf855a1de25f2106088c4c6 ↗
- https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f ↗
- https://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9 ↗
- https://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9 ↗
- https://git.kernel.org/stable/c/69d3c69ade1e4285ab4ca48fe7acee0767e65604 ↗
- https://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14 ↗