The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From e978de7a6d382ec378830ca2cf38e902df0b6d84 Mon Sep 17 00:00:00 2001
From: Jeremy Cline jcline@redhat.com Date: Fri, 27 Jul 2018 22:43:02 +0000 Subject: [PATCH] net: socket: Fix potential spectre v1 gadget in sock_is_registered
'family' can be a user-controlled value, so sanitize it after the bounds check to avoid speculative out-of-bounds access.
Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Jeremy Cline jcline@redhat.com Signed-off-by: David S. Miller davem@davemloft.net
diff --git a/net/socket.c b/net/socket.c index 4ac3b834cce9..8c24d5dc4bc8 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2690,7 +2690,8 @@ EXPORT_SYMBOL(sock_unregister);
bool sock_is_registered(int family) { - return family < NPROTO && rcu_access_pointer(net_families[family]); + return family < NPROTO && + rcu_access_pointer(net_families[array_index_nospec(family, NPROTO)]); }
static int __init sock_init(void)