linux-kernel - Re: [PATCH] xen/gntdev: avoid out of bounds access in case of partial gntdev

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Date:   Thu, 26 Oct 2017 18:54:55 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH] xen/gntdev: avoid out of bounds access in case of partial
 gntdev_mmap()

On 10/25/2017 12:46 PM, Boris Ostrovsky wrote:
> On 10/25/2017 11:08 AM, Juergen Gross wrote:
>> In case gntdev_mmap() succeeds only partially in mapping grant pages
>> it will leave some vital information uninitialized needed later for
>> cleanup. This will lead to an out of bounds array access when unmapping
>> the already mapped pages.
>>
>> So just initialize the data needed for unmapping the pages a little bit
>> earlier.
>>
>> Cc: <stable@...r.kernel.org>
>> Reported-by: Arthur Borsboom <arthurborsboom@...il.com>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>


Applied to for-linus-4.14c.

-boris