Re: [PATCH net-next 1/6] bpf: support 8-byte metafield access

Daniel Borkmann
2016-08-29T23:44:47Z

On 08/27/2016 04:31 AM, Alexei Starovoitov wrote:
> The verifier supported only 4-byte metafields in
> struct __sk_buff and struct xdp_md. The metafields in upcoming
> struct bpf_perf_event are 8-byte to match register width in struct pt_regs.
> Teach verifier to recognize 8-byte metafield access.
> The patch doesn't affect safety of sockets and xdp programs.
> They check for 4-byte only ctx access before these conditions are hit.
>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Acked-by: Daniel Borkmann <daniel@iogearbox.net>