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Date: Thu, 18 Sep 2014 19:28:04 +0200 From: Daniel Borkmann <dborkman@...hat.com> To: Alexei Starovoitov <ast@...mgrid.com> CC: "David S. Miller" <davem@...emloft.net>, Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net>, Hannes Frederic Sowa <hannes@...essinduktion.org>, Chema Gonzalez <chema@...gle.com>, Eric Dumazet <edumazet@...gle.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Pablo Neira Ayuso <pablo@...filter.org>, "H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...ux-foundation.org>, Kees Cook <keescook@...omium.org>, Linux API <linux-api@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v13 net-next 07/11] bpf: verifier (add ability to receive verification log) On 09/18/2014 05:24 PM, Alexei Starovoitov wrote: ... > solve or not. If we decide to solve it, we need to have > a plan to solve it all the way. Partial fix for size of bpf_attr > is not a plan. It's something that is not addressing the problem > completely. Little bit of help is not useful for userspace. It > would need to deal with new types, verifier differences and > other things that I mentioned earlier. Hm, I don't think it would be a strict requirement to solve it all the way, and I think that perf_event_open() with perf_copy_attr() is not trying to do so either. It, however, is trying on a ``best effort basis'' to still load something if new features are unused by the binary (I guess you saw the comment in perf_copy_attr()). Iff, e.g. due to new types we fail at the verifier stage, sure, that's life since we only have backwards-compatible guarantee, but in case we tried to use features we support, we're still able to load the eBPF program while right now, we're rejecting it right up-front. That's just my $0.02 ... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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