In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
can: bcm: fix lockless bound\/ifindex race and silent RX_SETUP failure<\/p>\n
bcm_sendmsg() reads bo->ifindex and checks bo->bound before taking
\nlock_sock(), while bcm_notify(), bcm_connect() and bcm_release() all
\nmutate both fields under that same lock. Because the lockless reads
\nand the locked writes are unordered with respect to each other, a
\nracing bcm_notify() (device unregister) or bcm_connect() (concurrent
\nbind on another thread sharing the socket) can make bcm_sendmsg()
\nobserve an inconsistent combination, e.g. a stale bound=1 together
\nwith the now-cleared ifindex=0, silently turning a socket bound to a
\nspecific CAN interface into one that also matches “any” interface.<\/p>\n
Keep the lockless bo->bound check purely as a fast-path reject, and
\nmove the ifindex read (and a bo->bound re-check) into the locked
\nsection, where every writer already serializes. This removes the
\npossibility of observing the two fields torn against each other,
\nrather than trying to fix it with more READ_ONCE()\/WRITE_ONCE() pairs
\non two independently updated fields. Annotate the now-purely-lockless
\nbo->bound accesses consistently across all its write sites.<\/p>\n
Also fix bcm_rx_setup() silently returning success when the target
\ndevice disappears concurrently instead of reporting -ENODEV, so a
\nbroken RX op is no longer left registered as if it had succeeded.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
can: bcm: fix lockless bound\/ifindex race and silent RX_SETUP failure<\/p>\n
bcm_sendmsg() reads bo->ifindex and checks bo->bound before <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6788","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6788","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=6788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}