linux-kernel - Re: [PATCH] Make /proc/slabinfo 0400

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

> 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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