From: Pavel Emelyanov <xemul@parallels.com>
To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Andrey Vagin <avagin@openvz.org>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Glauber Costa <glommer@parallels.com>,
Andi Kleen <andi@firstfloor.org>, Tejun Heo <tj@kernel.org>,
Matt Helsley <matthltc@us.ibm.com>,
Pekka Enberg <penberg@kernel.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
Vasiliy Kulikov <segoon@openwall.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Valdis.Kletnieks@vt.edu" <Valdis.Kletnieks@vt.edu>
Subject: Re: [RFC] syscalls, x86: Add __NR_kcmp syscall
Date: Wed, 18 Jan 2012 13:19:15 +0400 [thread overview]
Message-ID: <4F168E93.5010000@parallels.com> (raw)
In-Reply-To: <4F168CF3.5090400@gmail.com>
> I think Eric only said gt/lt compare is useful. We don't need to expose bare
> pointer order. example, kcmp(rotate(ptr, per-task-random-value)) is enough
> hide the critical information. I think.
The per-task might break thinks up in case
(tsk1->file != tsk2->file) && (rotate(tsk1->file, tsk1->random) == rotate(tsk2->file, tsk2->rotate))
but I agree, that the overall idea of comparing not bare pointers, but those poisoned with
some global value can address the Peter's concerns about rootkits.
Thanks,
Pavel
next prev parent reply other threads:[~2012-01-18 9:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-17 14:27 [RFC] syscalls, x86: Add __NR_kcmp syscall Cyrill Gorcunov
2012-01-17 14:38 ` Alexey Dobriyan
2012-01-17 14:44 ` Cyrill Gorcunov
2012-01-17 18:47 ` H. Peter Anvin
2012-01-17 21:15 ` Cyrill Gorcunov
2012-01-17 21:40 ` Eric W. Biederman
2012-01-18 5:07 ` Pavel Emelyanov
2012-01-17 21:35 ` Eric W. Biederman
2012-01-18 8:01 ` Cyrill Gorcunov
2012-01-18 9:12 ` KOSAKI Motohiro
2012-01-18 9:19 ` Pavel Emelyanov [this message]
2012-01-18 9:23 ` KOSAKI Motohiro
2012-01-18 11:57 ` Cyrill Gorcunov
2012-01-18 16:46 ` KOSAKI Motohiro
2012-01-18 17:20 ` Cyrill Gorcunov
2012-01-18 22:05 ` david
2012-01-18 22:49 ` Cyrill Gorcunov
2012-01-18 23:29 ` Eric W. Biederman
2012-01-19 6:55 ` Cyrill Gorcunov
2012-01-20 3:16 ` Eric W. Biederman
2012-01-20 8:40 ` Cyrill Gorcunov
2012-01-20 9:02 ` Cyrill Gorcunov
2012-01-20 14:51 ` H. Peter Anvin
2012-01-20 16:29 ` Cyrill Gorcunov
2012-01-20 16:57 ` H. Peter Anvin
2012-01-20 18:19 ` Cyrill Gorcunov
2012-01-20 18:22 ` Cyrill Gorcunov
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