In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
f2fs: fix fsck inconsistency caused by incorrect nat_entry flag usage<\/p>\n
f2fs_need_dentry_mark() reads nat_entry flags without mutual exclusion
\nwith the checkpoint path, which can result in an incorrect inode block
\nmarking state. The scenario is as follows:<\/p>\n
create & write & fsync ‘file A’ write checkpoint
\n– f2fs_do_sync_file \/\/ inline inode
\n – f2fs_write_inode \/\/ inode folio is dirty
\n – f2fs_write_checkpoint
\n – f2fs_flush_merged_writes
\n – f2fs_sync_node_pages
\n – f2fs_fsync_node_pages \/\/ no dirty node
\n – f2fs_need_inode_block_update \/\/ return true
\n – f2fs_fsync_node_pages \/\/ inode dirtied
\n – f2fs_need_dentry_mark \/\/return true
\n – f2fs_flush_nat_entries
\n – f2fs_write_checkpoint end
\n – __write_node_folio \/\/ inode with DENT_BIT_SHIFT set
\n SPO, “fsck –dry-run” find inode has already checkpointed but still
\n with DENT_BIT_SHIFT set<\/p>\n
The state observed by f2fs_need_dentry_mark() can differ from the state
\nobserved in __write_node_folio() after acquiring sbi->node_write. The
\nroot cause is that the semantics of IS_CHECKPOINTED and
\nHAS_FSYNCED_INODE are only guaranteed after the checkpoint write has
\nfully completed.<\/p>\n
This patch moves set_dentry_mark() into __write_node_folio() and
\nprotects it with the sbi->node_write lock.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
f2fs: fix fsck inconsistency caused by incorrect nat_entry flag usage<\/p>\n
f2fs_need_dentry_mark() reads nat_entry flags without mutual<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14844","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}