From: Andrea Arcangeli <andrea@suse.de>
To: Chris Wright <chrisw@osdl.org>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, kenneth.w.chen@intel.com
Subject: Re: disable-cap-mlock
Date: Fri, 2 Apr 2004 04:13:23 +0200 [thread overview]
Message-ID: <20040402021323.GP18585@dualathlon.random> (raw)
In-Reply-To: <20040401180441.B22989@build.pdx.osdl.net>
On Thu, Apr 01, 2004 at 06:04:41PM -0800, Chris Wright wrote:
> * Andrea Arcangeli (andrea@suse.de) wrote:
> > what you missed is that after you locked_vm -= you don't free anything,
> > you only unmap them from the address space which means nothing in terms
> > of amount if pinned ram.
>
> doesn't it free the huge page right there? each page gets
> huge_page_released, right?
that has nothing to do with freeing the page, that's just releasing 1
refcount, because you dropped the pte mapping, the page is still there
healthy in the pagecache ready for somebody else to shmat. If you were
right then a shmdt+shmat would corrupt the SGA.
Your patch breaks local security and it's trivial to DoS a machine with
it applied as far as I can tell.
next prev parent reply other threads:[~2004-04-02 2:13 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-01 13:59 disable-cap-mlock Andrea Arcangeli
2004-04-01 14:12 ` disable-cap-mlock Martin Zwickel
2004-04-01 16:48 ` disable-cap-mlock William Lee Irwin III
2004-04-01 16:59 ` disable-cap-mlock Andrea Arcangeli
2004-04-01 17:11 ` disable-cap-mlock Marc-Christian Petersen
2004-04-01 17:16 ` disable-cap-mlock William Lee Irwin III
2004-04-01 17:34 ` disable-cap-mlock Andrea Arcangeli
2004-04-01 17:38 ` disable-cap-mlock William Lee Irwin III
2004-04-01 17:42 ` disable-cap-mlock Andrea Arcangeli
2004-04-01 17:37 ` disable-cap-mlock Stephen Smalley
2004-04-01 17:44 ` disable-cap-mlock William Lee Irwin III
2004-04-01 17:49 ` disable-cap-mlock Andrea Arcangeli
2004-04-01 17:51 ` disable-cap-mlock William Lee Irwin III
2004-04-01 18:12 ` disable-cap-mlock William Lee Irwin III
2004-04-01 17:52 ` disable-cap-mlock Marc-Christian Petersen
2004-04-01 17:54 ` disable-cap-mlock William Lee Irwin III
2004-04-01 18:47 ` disable-cap-mlock Stephen Smalley
2004-04-01 19:26 ` disable-cap-mlock William Lee Irwin III
2004-04-01 20:23 ` disable-cap-mlock Marc-Christian Petersen
2004-04-01 21:13 ` disable-cap-mlock William Lee Irwin III
2004-04-01 21:31 ` disable-cap-mlock Marc-Christian Petersen
2004-04-01 18:34 ` disable-cap-mlock Andrew Morton
2004-04-01 18:49 ` disable-cap-mlock Andrea Arcangeli
2004-04-01 18:52 ` disable-cap-mlock Chen, Kenneth W
2004-04-01 18:59 ` disable-cap-mlock William Lee Irwin III
2004-04-01 19:27 ` disable-cap-mlock James Morris
2004-04-02 10:39 ` disable-cap-mlock Pavel Machek
2004-04-02 23:44 ` disable-cap-mlock William Lee Irwin III
2004-04-01 19:44 ` disable-cap-mlock Rik van Riel
2004-04-01 19:52 ` disable-cap-mlock Andrew Morton
2004-04-01 22:36 ` disable-cap-mlock Andrea Arcangeli
2004-04-01 22:43 ` disable-cap-mlock Marc-Christian Petersen
2004-04-01 23:08 ` disable-cap-mlock Rik van Riel
2004-04-01 23:26 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 0:59 ` disable-cap-mlock Chris Wright
2004-04-01 22:29 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 1:07 ` disable-cap-mlock Chris Wright
2004-04-02 1:18 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 1:30 ` disable-cap-mlock Chris Wright
2004-04-02 1:35 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 2:04 ` disable-cap-mlock Chris Wright
2004-04-02 2:13 ` Andrea Arcangeli [this message]
2004-04-02 2:21 ` disable-cap-mlock Chris Wright
2004-04-02 2:38 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 2:48 ` disable-cap-mlock Chris Wright
2004-04-02 1:30 ` disable-cap-mlock Andrew Morton
2004-04-02 1:59 ` disable-cap-mlock Chris Wright
2004-04-02 2:09 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 2:30 ` disable-cap-mlock Andrew Morton
2004-04-02 2:33 ` disable-cap-mlock Chris Wright
2004-04-02 2:45 ` disable-cap-mlock Andrew Morton
2004-04-02 2:51 ` disable-cap-mlock Chris Wright
2004-04-02 3:21 ` disable-cap-mlock William Lee Irwin III
2004-04-02 2:41 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 2:49 ` disable-cap-mlock Andrew Morton
2004-04-02 3:07 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 21:35 ` disable-cap-mlock Andrew Morton
2004-04-02 22:36 ` disable-cap-mlock Chris Wright
2004-04-02 22:56 ` disable-cap-mlock Andrea Arcangeli
2004-04-02 23:01 ` disable-cap-mlock Andrew Morton
2004-04-02 23:18 ` disable-cap-mlock Chris Wright
2004-04-05 12:13 ` disable-cap-mlock Stephen Smalley
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