]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
net: bpf: reject invalid shifts
authorRabin Vincent <rabin@rab.in>
Tue, 12 Jan 2016 19:17:08 +0000 (20:17 +0100)
committerDavid S. Miller <davem@davemloft.net>
Tue, 12 Jan 2016 20:55:39 +0000 (15:55 -0500)
commit06928b3870d213cb42b00e2949419f2d44b9d45f
treed1427c587b190b02f7d2e5b842c1804f38386128
parent03d84a5f83a67e692af00a3d3901e7820e3e84d5
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>
kernel/bpf/verifier.c
net/core/filter.c