linux-kernel - Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support

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Date:	13 Feb 2007 17:39:28 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan <alan@...rguk.ukuu.org.uk>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support

Alan <alan@...rguk.ukuu.org.uk> writes:

Funny, it sounds like batch() on stereoids @) Ok with an async context it becomes
somewhat more interesting.
 
> 	sys_setuid/gid/etc need to be synchronous only and not occur
> while other async syscalls are running in parallel to meet current kernel
> assumptions.
> 
> 	sys_exec and other security boundaries must be synchronous only
> and not allow async "spill over" (consider setuid async binary patching)

He probably would need some generalization of Andrea's seccomp work.
Perhaps using bitmaps? For paranoia I would suggest to white list, not black list
calls.

-Andi
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