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authorTom Herbert <tom@quantonium.net>2018-01-24 12:35:40 -0800
committerDavid S. Miller <davem@davemloft.net>2018-01-24 15:54:30 -0500
commit581e7226a5d43f629eb6399a121f85f6a15f81be (patch)
treebf1dde342aff9c631a516f2fc67525f2d1c283ee /net/kcm
parentnet: sched: fix TCF_LAYER_LINK case in tcf_get_base_ptr (diff)
downloadlinux-dev-581e7226a5d43f629eb6399a121f85f6a15f81be.tar.xz
linux-dev-581e7226a5d43f629eb6399a121f85f6a15f81be.zip
kcm: Only allow TCP sockets to be attached to a KCM mux
TCP sockets for IPv4 and IPv6 that are not listeners or in closed stated are allowed to be attached to a KCM mux. Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module") Reported-by: syzbot+8865eaff7f9acd593945@syzkaller.appspotmail.com Signed-off-by: Tom Herbert <tom@quantonium.net> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/kcm')
-rw-r--r--net/kcm/kcmsock.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index d4e98f20fc2a..7632797fb68e 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1387,8 +1387,13 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
if (!csk)
return -EINVAL;
- /* We must prevent loops or risk deadlock ! */
- if (csk->sk_family == PF_KCM)
+ /* Only allow TCP sockets to be attached for now */
+ if ((csk->sk_family != AF_INET && csk->sk_family != AF_INET6) ||
+ csk->sk_protocol != IPPROTO_TCP)
+ return -EOPNOTSUPP;
+
+ /* Don't allow listeners or closed sockets */
+ if (csk->sk_state == TCP_LISTEN || csk->sk_state == TCP_CLOSE)
return -EOPNOTSUPP;
psock = kmem_cache_zalloc(kcm_psockp, GFP_KERNEL);