linux-kernel - Re: seccomp and ptrace. what is the correct order?

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Message-ID: <4FBA93C1.1070308@zytor.com>
Date:	Mon, 21 May 2012 12:13:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
CC:	Eric Paris <netdev@...isplace.org>, Will Drewry <wad@...omium.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	kernel-hardening@...ts.openwall.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, indan@....nu,
	pmoore@...hat.com, akpm@...ux-foundation.org, corbet@....net,
	eric.dumazet@...il.com, markus@...omium.org,
	coreyb@...ux.vnet.ibm.com, keescook@...omium.org
Subject: Re: seccomp and ptrace. what is the correct order?

On 05/21/2012 11:47 AM, richard -rw- weinberger wrote:
> On Mon, May 21, 2012 at 8:21 PM, Eric Paris <netdev@...isplace.org> wrote:
>> Is that what we want?  Do we want to do the permission check based on
>> what a process ask at syscall enter or do we want to do the permission
>> check based on what the kernel is actually going to do on behalf of
>> the process?
> 
> I think we want the latter.
> A system call emulator like UserModeLinux would benefit from that.
> 

Are you sure?  This would mean that a seccomp program used by the
process to intercept its own system calls via SIGSYS would give
completely different results under UML than under native...

	-hpa

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