linux-kernel - Re: [PATCH][RFC] security: revalidate rw permissions for sys_splice and sys

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Date:	Wed, 30 May 2007 11:17:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	James Morris <jmorris@...ei.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: [PATCH][RFC] security: revalidate rw permissions for sys_splice
 and  sys_vmsplice

On Wed, 30 May 2007 09:15:01 +0200
Jens Axboe <jens.axboe@...cle.com> wrote:

> On Tue, May 29 2007, James Morris wrote:
> > Revalidate read/write permissions for splice(2) and vmslice(2), in case 
> > security policy has changed since the files were opened.
> 
> I guess it was inevitably going to happen :-)
> 
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
> 

Probably acked-by was more appropriate.

James, is this considered needed-for-2.6.22?

> +	ret = security_file_permission(out, MAY_WRITE);
> +	if (unlikely(ret < 0))
> +		return ret;


ot: all the unlikely()s are irksome.  I wonder if there was some way of
doing this in security_file_permission() instead.  eg:

static inline int security_file_permission (struct file *file, int mask)
{
	int ret = security_ops->file_permission (file, mask);

	if (likely(ret == 0))
		return 0;
	return ret;
}
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