linux-kernel - Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again

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Date:	Thu, 21 Dec 2006 22:04:53 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	rmk+lkml@....linux.org.uk, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all
 that again


On Dec 21 2006 18:51, Miklos Szeredi wrote:
>
>The root of the problem is that copy_to_user() may cause page faults
>on the userspace buffer, and the page fault might (in case of a
>maliciously crafted filesystem) recurse into the filesystem itself.

Would it be worthwhile to mlock the page? I know that needs root
privs or some capability, but a static buffer could be put aside when
fusermount is run.


	-`J'
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