linux-kernel - Re: [Bug #11382] e1000e: 2.6.27-rc1 corrupts EEPROM/NVM

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Date:	Thu, 25 Sep 2008 22:45:24 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
cc:	David Miller <davem@...emloft.net>, jeffrey.t.kirsher@...el.com,
	airlied@...il.com, david.vrabel@....com, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	chrisl@...are.com, Ingo Molnar <mingo@...e.hu>
Subject: Re: [Bug #11382] e1000e: 2.6.27-rc1 corrupts EEPROM/NVM

On Thu, 25 Sep 2008, Jesse Barnes wrote:

> Here's a patch that adds range checking to the sysfs mappings at least.  
> This patch should catch the case where X (or some other process) tries 
> to map beyond the specific BAR it's (supposedly) trying to access, 
> making things safer in general.  FWIW both my F9 and development 
> versions of X start up fine with this patch applied.

Good. We will use this on affected machines after we start some real 
debugging of this.

> +	/*
> +	 * Make sure the range the user is trying to map falls within
> +	 * the resource
> +	 */
> +	if (map_offset + map_len > pci_resource_len(pdev, i))
> +		return -EINVAL;
> +

At least for debugging purposes I'd propose to put a printk() there with 
process name, and the range it tries to map.

Thanks,

-- 
Jiri Kosina
SUSE Labs
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