linux-kernel - Re: [PATCH 09/11] security: Protection for exploiting null dereference using mmap

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Message-ID: <Line.LNX.4.64.0707100910270.14361@d.namei>
Date:	Tue, 10 Jul 2007 09:10:48 -0400 (EDT)
From:	James Morris <jmorris@...ei.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/11] security: Protection for exploiting null dereference
 using mmap

On Tue, 10 Jul 2007, Jan Engelhardt wrote:

> 
> On Jul 8 2007 22:59, James Morris wrote:
> >@@ -420,8 +420,12 @@ static int dummy_file_ioctl (struct file *file, unsigned int command,
> > 
> > static int dummy_file_mmap (struct file *file, unsigned long reqprot,
> > 			    unsigned long prot,
> >-			    unsigned long flags)
> >+			    unsigned long flags,
> >+			    unsigned long addr,
> >+			    unsigned long addr_only)
> > {
> >+	if (addr < mmap_min_addr)
> >+		return -EACCES;
> > 	return 0;
> > }
> > 
> 
> Not -EPERM?

No, EACCES is what's used.


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