In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ext4: skip extra isize expansion during mount to prevent deadlock<\/p>\n
ext4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty()
\nwhile holding an active jbd2 handle. During mount (!SB_ACTIVE), the
\nexpand path may move xattrs to external blocks and release ea_inodes via
\niput(). When !SB_ACTIVE, iput() calls write_inode_now() which acquires
\ns_writepages_rwsem, creating a circular lock dependency:<\/p>\n
s_writepages_rwsem –> jbd2_handle –> xattr_sem –> s_writepages_rwsem<\/p>\n
This can be triggered via:<\/p>\n
ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty()
\n -> ext4_try_to_expand_extra_isize()<\/p>\n
or:<\/p>\n
ext4_evict_inode() -> ext4_mark_inode_dirty()
\n -> ext4_try_to_expand_extra_isize()<\/p>\n
Skip expansion when !SB_ACTIVE. This is a minor loss of functionality
\n(extra isize won’t grow for these inodes during mount), which e2fsck
\ncan resolve later if needed.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ext4: skip extra isize expansion during mount to prevent deadlock<\/p>\n
ext4_try_to_expand_extra_isize() is called from __ext4_mark_inod<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28532","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28532","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=28532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}