linux-kernel - Re: [PATCH v2 03/15] NTB: Fix UB/bug in ntb_mw_get

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Date:   Tue, 5 Dec 2017 12:08:23 -0500
From:   Jon Mason <jdmason@...zu.us>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Hubbe, Allen" <Allen.Hubbe@....com>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "Yu, Xiangliang" <Xiangliang.Yu@....com>,
        Gary R Hook <gary.hook@....com>, Sergey.Semin@...latforms.ru,
        linux-ntb <linux-ntb@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/15] NTB: Fix UB/bug in ntb_mw_get_align()

On Tue, Dec 5, 2017 at 12:01 PM, Logan Gunthorpe <logang@...tatee.com> wrote:
>
>
> On 05/12/17 09:52 AM, Jon Mason wrote:
>>
>> On Sun, Dec 3, 2017 at 2:17 PM, Serge Semin <fancer.lancer@...il.com>
>> wrote:
>>>
>>> Simple (1 << pidx) operation causes undefined behaviour when
>>> pidx >= 32. It must be casted to u64 to match the actual return
>>> value of ntb_link_is_up() method, so to have all the possible
>>> peer indexes covered and to get rid of undefined behaviour.
>>> Additionally there are special macros in "linux/bitops.h" to perform
>>> the bit-set-shift operations, so it's recommended to have them used
>>> for proper bit setting.
>>
>>
>> This looks good to me, but also seems like a bug fix.  Please comment
>> on if this is not noticed.
>
>
> It would be a bug on any system that has more than 32 partitions which is
> run on a 32 bit machine (or 64 partitions on a 64bit machine). Such a system
> is theoretical for the foreseeable future. But it would be good to fix it
> now.

Seems like a non-issue then.  Disregard.

>
> Logan
>
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