linux-kernel - Re: [PATCH] drivers/net/tulip/de4x5.c: prevent reading uninitialized stack memory

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Message-ID: <20100914193610.GB24373@lackof.org>
Date:	Tue, 14 Sep 2010 13:36:10 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	David Miller <davem@...emloft.net>
Cc:	grundler@...isc-linux.org, kyle@...artin.ca,
	linux-kernel@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH] drivers/net/tulip/de4x5.c: prevent reading
	uninitialized stack memory

On Sat, Sep 11, 2010 at 07:46:38PM -0400, Dan Rosenberg wrote:
> The DE4X5_GET_REG device ioctl allows unprivileged users to read 32
> bytes of uninitialized stack memory, because it copies the
> uninitialized "addr" member instead of the intended "lval" member.
> This patch takes care of it.

Dan, Good catch.

Dave, please apply.

> 
> Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>

Acked-by: Grant Grundler <grundler@...isc-linux.org>

thanks,
grant

> 
> --- linux-2.6.35.4.orig/drivers/net/tulip/de4x5.c	2010-09-11
> 19:12:27.000000000 -0400
> +++ linux-2.6.35.4/drivers/net/tulip/de4x5.c	2010-09-11 19:17:12.000000000 -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 */
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