linux-kernel - Re: [PATCH 1/1] of: unittest: overlay: ensure proper alignment of copied FDT

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Date:   Thu, 8 Apr 2021 09:48:52 -0500
From:   Frank Rowand <frowand.list@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        devicetree@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] of: unittest: overlay: ensure proper alignment of
 copied FDT

On 4/7/21 5:01 PM, Guenter Roeck wrote:
> On 4/7/21 1:59 PM, Frank Rowand wrote:
>> Hi Guenter,
>>
>> On 4/7/21 3:51 PM, frowand.list@...il.com wrote:
>>> From: Frank Rowand <frank.rowand@...y.com>
>>>
>>> The Devicetree standard specifies an 8 byte alignment of the FDT.
>>> Code in libfdt expects this alignment for an FDT image in memory.
>>> kmemdup() returns 4 byte alignment on openrisc.  Replace kmemdup()
>>> with kmalloc(), align pointer, memcpy() to get proper alignment.
>>>
>>> The 4 byte alignment exposed a related bug which triggered a crash
>>> on openrisc with:
>>> commit 79edff12060f ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
>>> as reported in:
>>> https://lore.kernel.org/lkml/20210327224116.69309-1-linux@roeck-us.net/
>>
>> Can you please test this patch?
>>
> 
> Sure, will do, after you fixed the problem pointed out by Rob.
> 
> Sorry, I should have mentioned it - that problem was the reason
> why I didn't propose a fix myself.

No problem, I was aware of the issue but then spaced on actually
dealing with it.

- Space Cadet Frank

> 
> Guenter
>