linux-kernel - Re: [PATCH] dt: dt-extract-compatibles: Don't follow symlinks when walking tree

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Date:   Thu, 9 Nov 2023 11:56:59 -0600
From:   Rob Herring <robh@...nel.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>, kernel@...labora.com,
        Mark Brown <broonie@...nel.org>,
        Aishwarya TCV <aishwarya.tcv@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: [PATCH] dt: dt-extract-compatibles: Don't follow symlinks when
 walking tree

On Tue, 07 Nov 2023 17:55:28 -0500, Nícolas F. R. A. Prado wrote:
> The iglob function, which we use to find C source files in the kernel
> tree, always follows symbolic links. This can cause unintentional
> recursions whenever a symbolic link points to a parent directory. A
> common scenario is building the kernel with the output set to a
> directory inside the kernel tree, which will contain such a symlink.
> 
> Instead of using the iglob function, use os.walk to traverse the
> directory tree, which by default doesn't follow symbolic links. fnmatch
> is then used to match the glob on the filename, as well as ignore hidden
> files (which were ignored by default with iglob).
> 
> This approach runs just as fast as using iglob.
> 
> Fixes: b6acf8073517 ("dt: Add a check for undocumented compatible strings in kernel")
> Reported-by: Aishwarya TCV <aishwarya.tcv@....com>
> Closes: https://lore.kernel.org/all/e90cb52f-d55b-d3ba-3933-6cc7b43fcfbc@arm.com
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> 
> ---
> 
>  scripts/dtc/dt-extract-compatibles | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 

Applied, thanks!