linux-kernel - Re: [PATCH] scripts: Add intended executable mode and SPDX license

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Message-ID: <202008311219.8ECE17B6B@keescook>
Date:   Mon, 31 Aug 2020 12:20:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mrinal Pandey <mrinalmni@...il.com>, skhan@...uxfoundation.org,
        Linux-kernel-mentees@...ts.linuxfoundation.org, re.emese@...il.com,
        maennich@...gle.com, tglx@...utronix.de,
        gregkh@...uxfoundation.org, kernel-hardening@...ts.openwall.com,
        linux-kernel@...r.kernel.org, linux-spdx@...r.kernel.org
Subject: Re: [PATCH] scripts: Add intended executable mode and SPDX license

On Mon, Aug 31, 2020 at 07:45:25AM +0200, Lukas Bulwahn wrote:
> 
> 
> On Sun, 30 Aug 2020, Andrew Morton wrote:
> 
> > On Thu, 27 Aug 2020 14:54:05 +0530 Mrinal Pandey <mrinalmni@...il.com> wrote:
> > 
> > > commit b72231eb7084 ("scripts: add spdxcheck.py self test") added the file
> > > spdxcheck-test.sh to the repository without the executable flag and license
> > > information.
> > 
> > The x bit shouldn't matter.
> > 
> > If someone downloads and applies patch-5.9.xz (which is a supported way
> > of obtaining a kernel) then patch(1) will erase the x bit anyway.
> >
> 
> Andrew, Kees,
> 
> thanks for the feedback.
> 
> As his mentor, I see two valuable tasks for Mrinal to work on:
> 
> 1. Document this knowledge how scripts should be called, not relying on 
> the executable bit, probably best somewhere here:
> ./Documentation/kbuild/makefiles.rst, a new section on using dedicated 
> scripts in chapter 3 ("The  kbuild files").
> 
> https://www.kernel.org/doc/html/latest/kbuild/makefiles.html#the-kbuild-files

Yes, that would be excellent.

> 2. Determine if there are places in the build Makefiles that do rely on 
> the executable bit and fix those script invocations. (Kees' idea of remove 
> all executable bits and see...)

I think this has value, yes. I don't think patches to remove the x bits
are needed, but any cases where they are depended on need to be fixed.

And I think "3" could be "wire up or remove spdx shell script"

-- 
Kees Cook