From: Marcel Holtmann <marcel@holtmann.org>
Date: Fri, 4 May 2007 22:35:59 +0000 (+0200)
Subject: [Bluetooth] Fix L2CAP and HCI setsockopt() information leaks
X-Git-Tag: v2.6.22-rc1~822^2~2^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0878b6667f28772aa7d6b735abff53efc7bf6d91;p=pandora-kernel.git

[Bluetooth] Fix L2CAP and HCI setsockopt() information leaks

The L2CAP and HCI setsockopt() implementations have a small information
leak that makes it possible to leak kernel stack memory to userspace.

If the optlen parameter is 0, no data will be copied by copy_from_user(),
but the uninitialized stack buffer will be read and stored later. A call
to getsockopt() can now retrieve the leaked information.

To fix this problem the stack buffer given to copy_from_user() must be
initialized with the current settings.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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