In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
eventfs: Use children field for rcu head and add memory barriers<\/p>\n
When an eventfs inode is freed, it sets ei->is_freed and then uses its
\nei->list to add it to the srcu link list as the list field is a union with
\nthe rcu list head. As the ei->list is used to iterate over an SRCU
\nprotected list without taking the eventfs_mutex, there’s nothing stopping
\nthe iteration over that list to see the ei->rcu instead of the ei->list
\nand it will read a corrupt target.<\/p>\n
To fix this, change the union of the rcu list head with the children list.
\nOn freeing the eventfs inode, set the is_free and execute a smp_wmb()
\nbefore adding the eventfs inode to the SRCU list.<\/p>\n
On iteration of the ei->children list, at the start, execute a smp_rmb()
\nand then read the is_freed of the ei to see if the children list is still
\nvalid. If is_freed is set, then the ei_child read is not valid and the
\nloop should exit immediately.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
eventfs: Use children field for rcu head and add memory barriers<\/p>\n
When an eventfs inode is freed, it sets ei->is_freed and then use<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11211","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11211","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=11211"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11211"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}