CVE-2023-54140

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse<br /> <br /> A syzbot stress test using a corrupted disk image reported that<br /> mark_buffer_dirty() called from __nilfs_mark_inode_dirty() or<br /> nilfs_palloc_commit_alloc_entry() may output a kernel warning, and can<br /> panic if the kernel is booted with panic_on_warn.<br /> <br /> This is because nilfs2 keeps buffer pointers in local structures for some<br /> metadata and reuses them, but such buffers may be forcibly discarded by<br /> nilfs_clear_dirty_page() in some critical situations.<br /> <br /> This issue is reported to appear after commit 28a65b49eb53 ("nilfs2: do<br /> not write dirty data after degenerating to read-only"), but the issue has<br /> potentially existed before.<br /> <br /> Fix this issue by checking the uptodate flag when attempting to reuse an<br /> internally held buffer, and reloading the metadata instead of reusing the<br /> buffer if the flag was lost.