| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 057/148] macsec: restrict to ethernet devices | Date | Wed, 1 Apr 2020 18:17:29 +0200 |
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From: Willem de Bruijn <willemb@google.com>
[ Upstream commit b06d072ccc4b1acd0147b17914b7ad1caa1818bb ]
Only attach macsec to ethernet devices.
Syzbot was able to trigger a KMSAN warning in macsec_handle_frame by attaching to a phonet device.
Macvlan has a similar check in macvlan_port_create.
v1->v2 - fix commit message typo
Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/macsec.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -19,6 +19,7 @@ #include <net/genetlink.h> #include <net/sock.h> #include <net/gro_cells.h> +#include <linux/if_arp.h> #include <uapi/linux/if_macsec.h> @@ -3219,6 +3220,8 @@ static int macsec_newlink(struct net *ne real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); if (!real_dev) return -ENODEV; + if (real_dev->type != ARPHRD_ETHER) + return -EINVAL; dev->priv_flags |= IFF_MACSEC;
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