In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio_ccw: Selectively expand io_mutex<\/p>\n
The io_mutex was defined to serialize the io_regions, but then has
\nalso sort of been associated with the I\/O themselves because of
\nthe close relationship they share.<\/p>\n
With the handful of races that are possible, the choices are either to:
\n A) expand the scope of io_mutex to close these remaining windows, or
\n B) reduce the scope of io_mutex to just io_region, and introduce a new
\n lock mechanism for the remaining I\/O resources<\/p>\n
This patch implements A, since B brings with it a lot more interactions
\nthat would need to be tracked and kept in a correct hierarchy. It also
\ntakes advantage of the workqueue element for cp_free() that now gets
\ncalled out of fsm_notoper(), which could be invoked out of an interrupt
\ncontext and thus cannot acquire a mutex itself.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio_ccw: Selectively expand io_mutex<\/p>\n
The io_mutex was defined to serialize the io_regions, but then has
\nalso sort of been as<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11953","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11953","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=11953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}