Re: [PATCH net-next 1/6] bpf: support 8-byte metafield access
From: Daniel Borkmann
Date: Mon Aug 29 2016 - 19:44:50 EST
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@xxxxxxxxxx>
Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>