linux-kernel - Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole

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Message-Id: <1241670237.11500.7.camel@entropy>
Date:	Wed, 06 May 2009 21:23:57 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Markus Gutschke (顧孟勤) 
	<markus@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	linux-mips@...ux-mips.org, sparclinux@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole

On Wed, 2009-05-06 at 15:21 -0700, Markus Gutschke (顧孟勤) wrote:
> On Wed, May 6, 2009 at 15:13, Ingo Molnar <mingo@...e.hu> wrote:
> > doing a (per arch) bitmap of harmless syscalls and replacing the
> > mode1_syscalls[] check with that in kernel/seccomp.c would be a
> > pretty reasonable extension. (.config controllable perhaps, for
> > old-style-seccomp)
> >
> > It would probably be faster than the current loop over
> > mode1_syscalls[] as well.
> 
> This would be a great option to improve performance of our sandbox. I
> can detect the availability of the new kernel API dynamically, and
> then not intercept the bulk of the system calls. This would allow the
> sandbox to work both with existing and with newer kernels.
> 
> We'll post a kernel patch for discussion in the next few days,
> 

I suspect the correct thing to do would be to leave seccomp mode 1 alone
and introduce a mode 2 with a less restricted set of system calls -- the
interface was designed to be extended in this way, after all.

-- 
Nicholas Miell <nmiell@...cast.net>

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