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| author | Willem de Bruijn <willemb@google.com> | 2016-07-12 18:18:56 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-07-13 11:53:40 -0700 |
| commit | f4979fcea7fd36d8e2f556abef86f80e0d5af1ba (patch) | |
| tree | e44115be36c8eef0769d4defe66168635c64137a /net/rose | |
| parent | 22cb99fb76fb56b38f59770fbf22be03bb796d8d (diff) | |
| download | linux-f4979fcea7fd36d8e2f556abef86f80e0d5af1ba.tar.gz linux-f4979fcea7fd36d8e2f556abef86f80e0d5af1ba.tar.bz2 linux-f4979fcea7fd36d8e2f556abef86f80e0d5af1ba.zip | |
rose: limit sk_filter trim to payload
Sockets can have a filter program attached that drops or trims
incoming packets based on the filter program return value.
Rose requires data packets to have at least ROSE_MIN_LEN bytes. It
verifies this on arrival in rose_route_frame and unconditionally pulls
the bytes in rose_recvmsg. The filter can trim packets to below this
value in-between, causing pull to fail, leaving the partial header at
the time of skb_copy_datagram_msg.
Place a lower bound on the size to which sk_filter may trim packets
by introducing sk_filter_trim_cap and call this for rose packets.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rose')
| -rw-r--r-- | net/rose/rose_in.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/rose/rose_in.c b/net/rose/rose_in.c index 79c4abcfa6b4..0a6394754e81 100644 --- a/net/rose/rose_in.c +++ b/net/rose/rose_in.c @@ -164,7 +164,8 @@ static int rose_state3_machine(struct sock *sk, struct sk_buff *skb, int framety rose_frames_acked(sk, nr); if (ns == rose->vr) { rose_start_idletimer(sk); - if (sock_queue_rcv_skb(sk, skb) == 0) { + if (sk_filter_trim_cap(sk, skb, ROSE_MIN_LEN) == 0 && + __sock_queue_rcv_skb(sk, skb) == 0) { rose->vr = (rose->vr + 1) % ROSE_MODULUS; queued = 1; } else { |