linux-kernel - Re: [PATCH v2] drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory

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Message-Id: <20100916.215547.170109869.davem@davemloft.net>
Date:	Thu, 16 Sep 2010 21:55:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	drosenberg@...curity.com
Cc:	divy@...lsio.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH v2] drivers/net/cxgb3/cxgb3_main.c: prevent reading
 uninitialized stack memory

From: Dan Rosenberg <drosenberg@...curity.com>
Date: Wed, 15 Sep 2010 17:43:12 -0400

> Fixed formatting (tabs and line breaks).
> 
> The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to read
> 4 bytes of uninitialized stack memory, because the "addr" member of the
> ch_reg struct declared on the stack in cxgb_extension_ioctl() is not
> altered or zeroed before being copied back to the user.  This patch
> takes care of it.
> 
> Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>

Applied.
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