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List: linux-netdev
Subject: Re: [PATCH net] bpf: don't select potentially stale ri->map from buggy xdp progs
From: Jesper Dangaard Brouer <brouer () redhat ! com>
Date: 2017-09-08 5:06:10
Message-ID: 20170908070610.4b8e1df1 () redhat ! com
[Download RAW message or body]
On Fri, 8 Sep 2017 00:14:51 +0200
Daniel Borkmann <daniel@iogearbox.net> wrote:
> + /* This is really only caused by a deliberately crappy
> + * BPF program, normally we would never hit that case,
> + * so no need to inform someone via tracepoints either,
> + * just bail out.
> + */
> + if (unlikely(map_owner != xdp_prog))
> + return -EINVAL;
IMHO we do need to call the tracepoint here. It is not just crappy
BPF-progs that cause this situation, it is also drivers not implementing
XDP_REDIRECT yet (which is all but ixgbe). Due to the level XDP
operates at, tracepoints are the only way users can runtime troubleshoot
their XDP programs.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
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