In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
thunderbolt: Don’t access a DP tunnel after its DPRX read was canceled<\/p>\n
tb_dp_dprx_work() checks ->dprx_canceled before it takes tb->lock so it
\nmisses a tb_dp_dprx_stop() that could not cancel the already running
\nwork. It then polls the DPRX capabilities and runs the callback for a
\ntunnel that has already been torn down while the domain is suspending or
\ngoing away.<\/p>\n
This can be hit by cancelling the DPRX read from outside the ordered
\ntb->wq: During suspend tb_disconnect_and_release_dp() does just this and
\nwith a later patch tb_stop() will do it as well. The latter in combination
\nwith the Apple NHI where the DPRX read never completed is how I hit
\nthis.<\/p>\n
Check the flag with tb->lock held instead and check it again in
\ntb_dp_tunnel_active() because the callback runs after the lock has been
\ndropped again.<\/p>\n
Also clear the flag in tb_dp_dprx_start() so that it only ever describes
\nthe work that is currently in flight.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
thunderbolt: Don’t access a DP tunnel after its DPRX read was canceled<\/p>\n
tb_dp_dprx_work() checks ->dprx_canceled before it takes tb<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41161","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41161","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=41161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}