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

To: Markus Gutschke (顧孟勤) <markus@google.com>
Subject: Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole
From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 6 May 2009 23:54:50 +0200
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Roland McGrath <roland@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, x86@kernel.org, linux-kernel@vger.kernel.org, stable@kernel.org, linux-mips@linux-mips.org, sparclinux@vger.kernel.org, linuxppc-dev@ozlabs.org
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* Markus Gutschke (顧孟勤) <markus@google.com> wrote:

> On Wed, May 6, 2009 at 14:29, Ingo Molnar <mingo@elte.hu> wrote:
> > That's a pretty interesting usage. What would be fallback mode you
> > are using if the kernel doesnt have seccomp built in? Completely
> > non-sandboxed? Or a ptrace/PTRACE_SYSCALL based sandbox?
> 
> Ptrace has performance and/or reliability problems when used to 
> sandbox threaded applications due to potential race conditions 
> when inspecting system call arguments. We hope that we can avoid 
> this problem with seccomp. It is very attractive that kernel 
> automatically terminates any application that violates the very 
> well-defined constraints of the sandbox.
> 
> In general, we are currently exploring different options based on 
> general availability, functionality, and complexity of 
> implementation. Seccomp is a good middle ground that we expect to 
> be able to use in the medium term to provide an acceptable 
> solution for a large segment of Linux users. Although the 
> restriction to just four unfiltered system calls is painful.

Which other system calls would you like to use? Futexes might be 
one, for fast synchronization primitives?

        Ingo

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