Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.17 15/31] net: socket: Fix potential spectre v1 gadget in sock_is_registered | Date | Sat, 4 Aug 2018 11:00:50 +0200 |
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4.17-stable review patch. If anyone has any objections, please let me know.
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From: Jeremy Cline <jcline@redhat.com>
commit e978de7a6d382ec378830ca2cf38e902df0b6d84 upstream.
'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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- net/socket.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/socket.c +++ b/net/socket.c @@ -2694,7 +2694,8 @@ 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)
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