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Date: Fri, 26 Sep 2014 15:03:31 -0700 From: Alexei Starovoitov <ast@...mgrid.com> To: Andy Lutomirski <luto@...capital.net> Cc: David Miller <davem@...emloft.net>, Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Daniel Borkmann <dborkman@...hat.com>, 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>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: eBPF verifier thoughts (Re: [PATCH v15 net-next 00/11] eBPF syscall, verifier, testsuite) On Fri, Sep 26, 2014 at 2:47 PM, Andy Lutomirski <luto@...capital.net> wrote: > > Can't you just disallow the 1-byte write to the stack? of course not. That would be extremely limiting to users. Can you actually see yourself living with stack that only allows 8-byte writes/reads? The stack usage will increase a lot, since all char/short stack variables will become 8-byte... > I'll try it in Python. I bet I can get it to be shorter than the current code. Awesome challenge! :) I'll buy you a drink of your choice if you can achieve that. Also I'll send you our C programs that we use for testing to make sure, your python verifier can analyze them. If it passes, I'll be glad to rip mine out. Seriously. Deal? > Yes, but does it work reliably? I'm not saying current verifier is perfect. It can get better. So far it was enough to let people code freely on top of it. -- 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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