linux-kernel - Re: [PATCH] block: ioctl: fix information leak to userland

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Message-ID: <4CD7FE61.4000606@kernel.dk>
Date:	Mon, 08 Nov 2010 14:42:57 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Vasiliy Kulikov <segooon@...il.com>
CC:	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: ioctl: fix information leak to userland

On 2010-11-04 15:48, Vasiliy Kulikov wrote:
> Structure hd_geometry is copied to userland with 4 padding bytes
> between cylinders and start fields uninitialized on 64-bit platforms.
> It leads to leaking of contents of kernel stack memory.
> 
> Currently there is no memset() in real implementations of getgeo()
> in drivers/block/, so it makes sense to have memset() in blkdev_ioctl().

Thanks, applied.

-- 
Jens Axboe

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