In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure<\/p>\n
IPPROTO_SMC sockets create an internal TCP sock (“clcsock”) from the
\nproto->init hook. When socket creation fails after proto->init has
\nrun – e.g. a cgroup BPF program attached to BPF_CGROUP_INET_SOCK_CREATE
\ndenies the socket – sk_common_release() only invokes sk_prot->destroy
\nif it is set, but neither smc_inet_prot nor smc_inet6_prot defines it,
\nand smc_destruct() returns early unless sk_state is SMC_CLOSED. As a
\nresult, every failing socket(AF_INET, SOCK_STREAM, IPPROTO_SMC) call
\nleaks one tcp_sock, so an unprivileged task able to attach a deny-all
\nBPF_CGROUP_INET_SOCK_CREATE program to its own cgroup can grow kernel
\nmemory unboundedly.<\/p>\n
Add a .destroy hook to both protos that releases the clcsock via
\nsmc_clcsock_release(). smc_sk_init() hashes the sock into the smc
\nhashinfo before the clcsock is created, and smc_diag dumps walk that
\nhash dereferencing smc->clcsock without taking clcsock_release_lock,
\nwhile sk_common_release() calls .destroy before .unhash. Unhash the
\nsock before releasing the clcsock, as __smc_release() does, so a
\nconcurrent dump cannot observe the release; the second unhash in
\nsk_common_release() is a no-op.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure<\/p>\n
IPPROTO_SMC sockets create an internal TCP sock (“cl<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25474","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25474","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=25474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25474"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}