In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: restrict SO_RESERVE_MEM to TCP sockets and cap max value<\/p>\n
Commit 2bb2f5fb21b0 (“net: add new socket option SO_RESERVE_MEM”) and
\ncommit d00c8ee31729 (“net: fix possible NULL deref in sock_reserve_memory”)
\nonly checked sk_has_account(sk), which is true for both TCP and UDP
\nsockets.<\/p>\n
However, SO_RESERVE_MEM and sk_unused_reserved_mem() are currently only
\nsupported by TCP:
\n– On UDP sockets, sk->sk_forward_alloc is protected by
\n sk->sk_receive_queue.lock, whereas sock_reserve_memory() and
\n sock_release_reserved_memory() only acquire lock_sock(sk). Concurrent
\n UDP packet reception\/release and setsockopt(SO_RESERVE_MEM) corrupt
\n sk_forward_alloc and memcg accounting.
\n– udp_rmem_release() reclaims excess sk_forward_alloc without
\n accounting for sk_unused_reserved_mem(sk).<\/p>\n
Restrict sock_reserve_memory() to TCP sockets (sk_is_tcp(sk)) for now.
\nSupporting SO_RESERVE_MEM for UDP (acquiring sk_receive_queue.lock and
\nhonoring sk_unused_reserved_mem() in udp_rmem_release()) can be done in
\na future net-next series if needed.<\/p>\n
In addition, reject val > SZ_1G with -EINVAL in
\nsk_setsockopt(SO_RESERVE_MEM). Without an upper bound, values near
\nINT_MAX cause sk_mem_pages(delta) and (pages <sk_forward_alloc and
\nsk->sk_reserved_mem. Using a page-aligned cap (SZ_1G) ensures that the
\npage-rounded sk->sk_reserved_mem reported by getsockopt(SO_RESERVE_MEM)
\ncan always be passed back to setsockopt(SO_RESERVE_MEM).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: restrict SO_RESERVE_MEM to TCP sockets and cap max value<\/p>\n
Commit 2bb2f5fb21b0 (“net: add new socket option SO_RESERVE_MEM”) an<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41273","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41273","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=41273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}