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

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Date:   Wed, 7 Apr 2021 15:01:00 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Frank Rowand <frowand.list@...il.com>,
        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 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.

Guenter