Commit e978de7a authored Jul 27, 2018 by Jeremy Cline Committed by David S. Miller Jul 28, 2018

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>

parent c8e8cd57

net/socket.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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)