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Willem de Bruijn f4979fcea7 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>

2016-07-13 11:53:40 -07:00

af_rose.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2015-06-24 02:58:51 -07:00

Makefile

…

rose_dev.c

net: Kill dev_rebuild_header

2015-03-02 16:43:41 -05:00

rose_in.c

rose: limit sk_filter trim to payload

2016-07-13 11:53:40 -07:00