tree b16b3b389afb1bb660373bab3ec2f986d99a6e13
parent 7aaed57c5c2890634cfadf725173c7c68ea4cb4f
author Rabin Vincent <rabin@rab.in> 1452626228 +0100
committer David S. Miller <davem@davemloft.net> 1452636413 -0500

net: bpf: reject invalid shifts

On ARM64, a BUG() is triggered in the eBPF JIT if a filter with a
constant shift that can't be encoded in the immediate field of the
UBFM/SBFM instructions is passed to the JIT.  Since these shifts
amounts, which are negative or >= regsize, are invalid, reject them in
the eBPF verifier and the classic BPF filter checker, for all
architectures.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>