From: Vasiliy Kulikov <segooon@gmail.com>
Date: Mon, 8 Nov 2010 13:42:40 +0000 (+0100)
Subject: block: ioctl: fix information leak to userland
X-Git-Tag: v2.6.37-rc2~30^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a014741c0adfb8fb79952939ca087cf03d272bb9;p=pandora-kernel.git

block: ioctl: fix information leak to userland

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().

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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