netdev - Re: [PATCH v11 net-next 00/12] eBPF syscall, verifier, testsuite

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Message-ID: <CAMEtUuxXNX9fhZ2Nm+Y=Y__AfdeDBRf86Hq7=4Od=L5=JzDubQ@mail.gmail.com>
Date:	Wed, 10 Sep 2014 10:48:24 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	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@...uxfoundation.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 v11 net-next 00/12] eBPF syscall, verifier, testsuite

On Wed, Sep 10, 2014 at 2:21 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
>
> When you pass in these structs with pointers in it to other user space
> buffers, how do you handle this with mixed 32/64 bit user/kernel space?
...
> Perhaps I'm missing something, but I think, that would currently break in
> your syscall handler, no?

yes. compat stuff is not part of this diff.
I was thinking to handle it similar to the way signalfd deals with it:
add compat syscall, compat struct and convert it before going into
main entry point.
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