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

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Message-ID: <20090506215450.GA9537@elte.hu>
Date:	Wed, 6 May 2009 23:54:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Markus Gutschke (顧孟勤) <markus@...gle.com>
Cc:	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


* Markus Gutschke (顧孟勤) <markus@...gle.com> wrote:

> On Wed, May 6, 2009 at 14:29, Ingo Molnar <mingo@...e.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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