In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: restore rq_status_counter to even on all nfsd_dispatch() exit paths<\/p>\n
nfsd_dispatch() sets rq_status_counter to an odd value once a request has
\nbeen decoded, and back to an even value once it has been fully processed,
\nforming a seq-lock like protocol with the lockless reader in
\nnfsd_nl_rpc_status_get_dumpit().<\/p>\n
Only the fully successful path restored the counter to even. The cache-hit
\n(RC_REPLY), drop (RC_DROPIT \/ RQ_DROPME) and encode-error paths all return
\nafter the odd-valued store without ever bringing the counter back to even.
\nOnce one of those paths is taken, rq_status_counter is left odd: the next
\nrequest’s decode ORs in 1 (still odd) and only a subsequent successful
\nencode restores even. While stuck odd, the dumpit reader treats the rqstp
\nfields as stable and its retry check compares against the same unchanging
\nodd value, so it never detects concurrent mutation. This exposes actively
\nmutating fields (e.g. args->ops \/ args->opcnt during compound decode and
\nrelease) to the lockless reader, which can read past the end of the
\n8-element inline ops array.<\/p>\n
Add a helper that advances the counter to the next even value and call it
\non every return path that follows the odd-valued store. The decode-error
\npath is left untouched as it is reached before the counter is set odd.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: restore rq_status_counter to even on all nfsd_dispatch() exit paths<\/p>\n
nfsd_dispatch() sets rq_status_counter to an odd value o<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21627","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21627","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=21627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}