Linux nilfs2 fix: clear 'checked' flag to prevent security check skip during page discard

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue: After detecting filesystem corruption and degrading to read-only mode during directory operations, the function in nilfs2 may fail, leading to kernel panic due to access beyond block size. - Cause: During nilfs2's internal handling, when a page/label is discarded, the "checked" flag is not cleared, causing the safety check for directory entries to be skipped upon reload. 2. Fix: - Resolution: Clear the "checked" flag in nilfs2's internal handling when a page/label is discarded. - Necessity: The "checked" flag must be cleared when using nilfs2's internal page discard function. 3. Links and References: - Link: https://lkml.kernel.org/r/20241017193359.5051-1-konishi.ryusuke@gmail.com - Fix Commit: 8c26c4e2694a ("nilfs2: fix issue with flush kernel thread after remount in RO mode because of driver's internal error or metadata corruption") - Reporter: syzbot+d6ca2daf692c7a82f959@syzkaller.appspotmail.com - Closed: https://syzkaller.appspot.com/bug?extid=d6ca2daf692c7a82f959 4. Authors and Contributors: - Author: Ryusuke Konishi - Contributor: Greg Kroah-Hartman - Reporter: Andrew Morton 5. Code Changes: - File: fs/nilfs2/page.c - Change: Added code to clear the "checked" flag during nilfs2's internal handling. This information provides a detailed overview of the vulnerability's background, the applied fix, relevant links, and contributors involved.

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Linux nilfs2 fix: clear 'checked' flag to prevent security check skip during page discard