linux-kernel - Re: [RFC PATCH 1/2] net: ethtool: Add capability to retrieve plug-in module EEPROM

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Date:	Wed, 11 Apr 2012 19:16:57 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Stuart Hodgson <smhodgson@...arflare.com>
CC:	<netdev@...r.kernel.org>, <bruce.w.allan@...el.com>,
	<mirq-linux@...e.qmqm.pl>, <decot@...gle.com>,
	<amit.salecha@...gic.com>, <alexander.h.duyck@...el.com>,
	<davem@...emloft.net>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/2] net: ethtool: Add capability to retrieve
 plug-in module EEPROM

On Wed, 2012-04-11 at 17:50 +0100, Stuart Hodgson wrote:
> On 02/04/12 18:52, Ben Hutchings wrote:
[...]
> >> --- a/net/core/ethtool.c
> >> +++ b/net/core/ethtool.c
[...]
> >> +    if (eeprom.offset + eeprom.len>  modinfo.eeprom_len)
> >> +        return -EINVAL;
> >> +
> >> +    data = kmalloc(PAGE_SIZE, GFP_USER);
> >> +    if (!data)
> >> +        return -ENOMEM;
> >
> > What if some device has a larger EEPROM?  Surely this length should be
> > eeprom.len.
> >
> 
> Do you mean what if the eeprom length in te device is larger than
> PAGE_SIZE?

Yes.

> If so then it should really use modinfo.eeprom_len since
> this the size of the data. eeprom.len could be arbitary.

No, eeprom.len is the size of the data and we've already validated it at
this point.

Ben.


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