CVE-2024-50230

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nilfs2: fix kernel bug due to missing clearing of checked flag<br /> <br /> Syzbot reported that in directory operations after nilfs2 detects<br /> filesystem corruption and degrades to read-only,<br /> __block_write_begin_int(), which is called to prepare block writes, may<br /> fail the BUG_ON check for accesses exceeding the folio/page size,<br /> triggering a kernel bug.<br /> <br /> This was found to be because the "checked" flag of a page/folio was not<br /> cleared when it was discarded by nilfs2&amp;#39;s own routine, which causes the<br /> sanity check of directory entries to be skipped when the directory<br /> page/folio is reloaded. So, fix that.<br /> <br /> This was necessary when the use of nilfs2&amp;#39;s own page discard routine was<br /> applied to more than just metadata files.