linux-kernel - Re: [PATCH][V2] RDMA/nes: do not leak uninitialized resp.reserved to userspace Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit

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Message-ID: <20170904135622.GA1070@mtr-leonro.local>
Date:   Mon, 4 Sep 2017 16:56:22 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Faisal Latif <faisal.latif@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        linux-rdma@...r.kernel.org, kernel-janitors@...r.kernel.org,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] RDMA/nes: do not leak uninitialized resp.reserved to
 userspace Content-Type: text/plain; charset="utf-8"
 Content-Transfer-Encoding: 8bit

On Mon, Sep 04, 2017 at 02:37:05PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> resp.reserved has not been initialized and so the copy_to_user (via
> ib_copy_to_udata) is copying uninitialized data from the stack back
> to user space which is a potential information leak. Fix this by
> initializing all of resp to zero.
>
> V2: Initialize all of the struct rather than just resp.reserved as
> suggested by Leon Romanovsky.

Small nitpick, it is better to put changelog under "---" marker, so
it won't be visible in the git log.

Thanks
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>

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