In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/smc: stop killed, freed and out_of_sync sharing a byte<\/p>\n
The three connection state flags are single-bit bitfields, so they occupy
\none byte of struct smc_connection and every store to one is a
\nread-modify-write of the other two:<\/p>\n
u8 killed : 1;
\n u8 freed : 1;
\n u8 out_of_sync : 1;<\/p>\n
They are not written under a common lock. smc_cdc_msg_validate() sets
\nout_of_sync from the receive tasklet, while smc_conn_kill() sets killed
\nfrom process context under lock_sock(), and the receive path does not defer
\nto the backlog when the socket is owned — smc_cdc_msg_recv() takes only
\nbh_lock_sock().<\/p>\n
Give each flag its own byte so a store no longer touches its neighbours.
\nAll readers test them as booleans and are unchanged. struct smc_connection
\ngrows by two bytes.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/smc: stop killed, freed and out_of_sync sharing a byte<\/p>\n
The three connection state flags are single-bit bitfields, so they occu<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21313","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21313","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=21313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}