In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
io_uring: defer eventfd signaling when queued from a wakeup handler<\/p>\n
io_req_local_work_add() signals the CQ ring eventfd inline when it is the
\none to push the first entry onto ->work_list. For DEFER_TASKRUN rings that
\nadd is frequently done from a waitqueue wakeup handler, where an
\narbitrary waitqueue lock is held.<\/p>\n
eventfd_signal_mask() only refuses to recurse when current->in_eventfd
\nis set, but that bit is set by eventfd_signal_mask() itself. If the wake
\nchain starts somewhere else, signal goes out inline and can feed back
\ninto epoll.<\/p>\n
Add IOU_F_TWQ_IN_WAKE, set it on the task_work add done from the three
\nwaitqueue callbacks, and use it to force io_eventfd_signal() down the
\nexisting call_rcu_hurry() deferral instead of signaling inline.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
io_uring: defer eventfd signaling when queued from a wakeup handler<\/p>\n
io_req_local_work_add() signals the CQ ring eventfd inline whe<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-20403","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/20403","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=20403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}