Re: [PATCH] Make /proc/slabinfo 0400 [LWN.net]

From:		Alan Cox <alan-AT-lxorguk.ukuu.org.uk>
To:		"Ted Ts'o" <tytso-AT-mit.edu>
Subject:		Re: [PATCH] Make /proc/slabinfo 0400
Date:		Sun, 6 Mar 2011 13:19:55 +0000
Message-ID:		<20110306131955.722d9bd5@lxorguk.ukuu.org.uk>
Cc:		Matt Mackall <mpm-AT-selenic.com>, Pekka Enberg <penberg-AT-kernel.org>, Dan Rosenberg <drosenberg-AT-vsecurity.com>, Linus Torvalds <torvalds-AT-linux-foundation.org>, Dave Hansen <dave-AT-linux.vnet.ibm.com>, cl-AT-linux-foundation.org, linux-mm-AT-kvack.org, linux-kernel-AT-vger.kernel.org, Ingo Molnar <mingo-AT-elte.hu>, Andrew Morton <akpm-AT-linux-foundation.org>
Archive-link:		Article, Thread

> If we had wrappers for the most common cases, then any cases that were
> left that used copy_from_user() explicitly could be flagged and
> checked by hand, since they would be exception, and not the rule.

Arjan's copy_from_user validation code already does verification checks
on the copies using gcc magic.

Some of the others might be useful - kmalloc_from_user() is a fairly
obvious interface, a copy_from_user_into() interface where you pass
the destination object and its actual length as well is mostly covered by
Arjan's stuff.

Alan

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