linux-kernel - Re: [GIT] More security subsystem fixes

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Message-ID: <alpine.LRH.2.00.1201231428120.22633@tundra.namei.org>
Date:	Mon, 23 Jan 2012 14:28:50 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	David Howells <dhowells@...hat.com>
cc:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [GIT] More security subsystem fixes

On Thu, 19 Jan 2012, Tetsuo Handa wrote:

> mpi_limb_t
> mpihelp_divrem(mpi_ptr_t qp, mpi_size_t qextra_limbs,
>                mpi_ptr_t np, mpi_size_t nsize, mpi_ptr_t dp, mpi_size_t dsize)
> {
>         mpi_limb_t most_significant_q_limb = 0;
> 
>         switch (dsize) {
>         case 0:
>                 /* We are asked to divide by zero, so go ahead and do it!  (To make
>                    the compiler not remove this statement, return the value.)  */
>                 return 1 / dsize;
> 
> What's this? Division by 0 in the kernel is no good.

David,

Do you know if this is triggerable from userland?


- James
-- 
James Morris
<jmorris@...ei.org>
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