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From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg KH <gregkh@suse.de>, Ian Campbell <ijc@hellion.org.uk>,
	linux-kernel@vger.kernel.org, stable@kernel.org,
	stable-review@kernel.org, akpm@linux-foundation.org,
	alan@lxorguk.ukuu.org.uk, Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [RFC] mlock/stack guard interaction fixup
Date: Mon, 23 Aug 2010 11:22:25 +0200	[thread overview]
Message-ID: <1282555345.2605.1520.camel@laptop> (raw)
In-Reply-To: <AANLkTi=wWcAg8MdWy4O-0au3m6mH+9xWDOKVCJ_x5G_v@mail.gmail.com>

On Sun, 2010-08-22 at 11:21 -0700, Linus Torvalds wrote:
> Doing hypercalls from user space on stuff that is on the stack,
> rather than just copying it to some stable area is dodgy. And I
> guarantee that doing the crazy mlock dance is slower than the copy, so
> it's complex, fragile, _and_ slow.
> 
That sounds broken too, not having read the initial problem and such, it
sounds like the hypercall would expect the pages to stay pinned and
mlock doesn't actually guarantee that at all.



  parent reply	other threads:[~2010-08-23  9:22 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-20 23:59 [RFC] mlock/stack guard interaction fixup Linus Torvalds
2010-08-21  0:20 ` Mike Snitzer
2010-08-21  0:54   ` Linus Torvalds
2010-08-21 11:56 ` Ian Campbell
2010-08-21 15:48   ` Linus Torvalds
2010-08-21 16:08     ` Sam Ravnborg
2010-08-23 16:34       ` Tony Luck
2010-08-22  6:57     ` Ian Campbell
2010-08-22  7:33       ` Ian Campbell
2010-08-22  9:55         ` Ian Campbell
2010-08-22 16:43           ` Linus Torvalds
2010-08-22 17:25           ` Greg KH
2010-08-22 18:21             ` Linus Torvalds
2010-08-22 19:04               ` Greg KH
2010-08-23  9:22               ` Peter Zijlstra [this message]
2010-08-23 15:42               ` ijackson
2010-08-23 16:25                 ` Peter Zijlstra
2010-08-23 17:18                   ` Ian Jackson
2010-08-23 17:34                     ` Linus Torvalds
2010-08-23 17:53                       ` Peter Zijlstra
2010-08-23 17:59                       ` Peter Zijlstra
2010-08-23 18:43                         ` Darren Hart
2010-08-23 18:50                       ` Jeremy Fitzhardinge
2010-08-23 19:07                         ` Peter Zijlstra
2010-08-23 19:23                           ` Jeremy Fitzhardinge
2010-08-23 19:26                             ` Peter Zijlstra
2010-08-23 19:54                               ` Jeremy Fitzhardinge
2010-08-24  7:08                                 ` Peter Zijlstra
2010-08-24  7:20                                   ` Peter Zijlstra
2010-08-23 19:03                       ` Ian Campbell
2010-08-23 17:40                     ` Peter Zijlstra
2010-08-23 18:53                     ` Jeremy Fitzhardinge
2010-08-25  8:28             ` [Stable-review] " Stefan Bader
2010-08-23  9:00 ` Peter Zijlstra

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