In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to truncate meta...

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to truncate meta inode pages forcely

Below race case can cause data corruption:

Thread A GC thread - gc_data_segment - ra_data_block - locked meta_inode page

• f2fs_inplace_write_data
• invalidate_mapping_pages : fail to invalidate meta_inode page due to lock failure or dirty|writeback status
• f2fs_submit_page_bio : write last dirty data to old blkaddr - move_data_block - load old data from meta_inode page - f2fs_submit_page_write : write old data to new blkaddr

Because invalidate_mapping_pages() will skip invalidating page which has unclear status including locked, dirty, writeback and so on, so we need to use truncate_inode_pages_range() instead of invalidate_mapping_pages() to make sure meta_inode page will be dropped.