In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nvmet: copy the hostid into the ctrl before creating PR pc_refs<\/p>\n
Commit 6202783184bf (“nvmet: Improve nvmet_alloc_ctrl() interface and
\nimplementation”) added a second uuid_copy() of args->hostid near the end
\nof nvmet_alloc_ctrl(), and commit 7b658153f1b8 (“nvmet: Remove duplicate
\nuuid_copy”) removed the original copy that sat before
\nnvmet_ctrl_init_pr() instead of the new one.<\/p>\n
Since then nvmet_ctrl_init_pr() snapshots ctrl->hostid into the
\nper-controller per-namespace reservation refs while the uuid_copy()
\nfrom the connect data runs later, after the controller is published.
\nThe ctrl is allocated with kzalloc(), so every pc_ref created on this
\npath stores the nil UUID.<\/p>\n
pc_ref->hostid has a single consumer: nvmet_pr_set_ctrl_to_abort()
\nmatches it against the preempted registrant’s hostid to kill and drain
\nthe victim’s in-flight I\/O for Preempt and Abort. The match can never
\nhit with the nil UUID, so whenever a namespace with reservations
\nenabled exists before a host connects, which includes every reconnect,
\nPreempt and Abort silently degrades into a plain Preempt: the
\npreempting host sees success while the victim’s in-flight I\/O is still
\nin the air.<\/p>\n
Copy the hostid where the rest of the connect data is consumed, before
\nthe controller is published and before nvmet_ctrl_init_pr() takes its
\nsnapshot.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nvmet: copy the hostid into the ctrl before creating PR pc_refs<\/p>\n
Commit 6202783184bf (“nvmet: Improve nvmet_alloc_ctrl() interface <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41195","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41195","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=41195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}