netdev - Re: [PATCH v3] drivers/net/tulip/de4x5.c: fix union member name in DE4X5_GET

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Date:	Fri, 17 Sep 2010 07:31:55 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	David Miller <davem@...emloft.net>, grundler@...isc-linux.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	kyle@...artin.ca, jeffm@...e.com, security@...nel.org
Subject: Re: [PATCH v3] drivers/net/tulip/de4x5.c: fix union member name in
 DE4X5_GET_REG ioctl

Le vendredi 17 septembre 2010 à 01:05 -0400, Dan Rosenberg a écrit :
> Now with descriptive title, as requested.
> 
> This was previously reported as a security issue due to leakage of
> uninitialized stack memory.  Jeff Mahoney pointed out that this is
> incorrect since the copied data is from a union (rather than a struct).
> Therefore, this patch is only under consideration for the sake of
> correctness, and is not security relevant. 
> 
> Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
> Acked-by: Grant Grundler <grundler@...isc-linux.org>
> 
> --- linux-2.6.35.4.orig/drivers/net/tulip/de4x5.c       2010-08-26 19:47:12.000000000 -0400
> +++ linux-2.6.35.4/drivers/net/tulip/de4x5.c    2010-09-14 21:26:52.499474207 -0400
> @@ -5474,7 +5474,7 @@ de4x5_ioctl(struct net_device *dev, stru
>         tmp.lval[6] = inl(DE4X5_STRR); j+=4;
>         tmp.lval[7] = inl(DE4X5_SIGR); j+=4;
>         ioc->len = j;
> -       if (copy_to_user(ioc->data, tmp.addr, ioc->len)) return -EFAULT;
> +       if (copy_to_user(ioc->data, tmp.lval, ioc->len)) return -EFAULT;
>         break;
>  
>  #define DE4X5_DUMP              0x0f /* Dump the DE4X5 Status */
> 


While you are at it

	if (copy_to_user(ioc->data, tmp.lval, ioc->len))
		return -EFAULT;

Thanks


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