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

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Message-ID: <Pine.LNX.4.64.0707100951140.11053@fbirervta.pbzchgretzou.qr>
Date:	Tue, 10 Jul 2007 09:52:13 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	James Morris <jmorris@...ei.org>
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 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?


	Jan
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