linux-kernel - Re: [PATCH 0/2] of: unittest: re-implement overlay tracking

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Date:   Fri, 31 Dec 2021 21:39:49 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh+dt@...nel.org>, erhard_f@...lbox.org,
        yinxiujiang@...inos.cn
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] of: unittest: re-implement overlay tracking

Hi Erhard,

Can you please check whether this patch series fixes the shift-out-of-bounds
problem you reported?

-Frank


On 12/31/21 9:33 PM, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> Some overlays are tracked when they are applied.  The tracked overlays
> are later removed after the overlay tests are completed.  The old
> implementation makes assumptions about the expected values for
> overlay changeset id created by the overlay apply which result
> in fragile code.  The new code removes the assumptions.
> 
> A symptom that exposes a problem with the tracking code is a
> warning "UBSAN: shift-out-of-bounds in drivers/of/unittest.c:1933:36",
> Kernel Version: 5.15-rc7, PPC-64, Talos II.  This results from variable
> "id" value of -1 in the final line of of_unittest_untrack_overlay().
> 
> The first patch in the series cleans up the inconsistent use of overlay
> changeset id and the obsolete overlay id.  The id is a core concept in
> the overlay tracking that is re-implemented in the second patch in
> the series.
> 
> Frank Rowand (2):
>   of: unittest: change references to obsolete overlay id
>   of: unittest: re-implement overlay tracking
> 
>  drivers/of/unittest.c | 154 +++++++++++++++++++-----------------------
>  1 file changed, 71 insertions(+), 83 deletions(-)
>