linux-kernel - Re: [PATCH v5 1/3] Provide in-kernel headers to make extending kernel easier

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Message-ID: <CAGXu5j+KPVRcOJ3Ue9ZQF93GyaDhvCnFCvJ_C3WKCx2=SNdDyg@mail.gmail.com>
Date:   Mon, 15 Apr 2019 22:50:10 -0500
From:   Kees Cook <keescook@...omium.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Olof Johansson <olof@...om.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Qais Yousef <qais.yousef@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Manoj Rao <linux@...ojrajarao.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        atish patra <atishp04@...il.com>,
        Daniel Colascione <dancol@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Kees Cook <keescook@...omium.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-trace-devel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH v5 1/3] Provide in-kernel headers to make extending kernel easier

On Mon, Apr 15, 2019 at 9:41 AM Steven Rostedt <rostedt@...dmis.org> wrote:
> I agree with this assessment. We shouldn't use config.gz as precedence
> for this solution. config.gz should have been in debugfs to begin with,
> but I don't believe debugfs was around when config.gz was introduced.
> (Don't have time to look into the history of the two).

I don't agree with this: /proc/config.gz is used by a lot of tools
that do sanity-check of running systems. This isn't _debugging_...
it's verifying correct kernel builds. It's a fancy version of checking
/proc/version.

-- 
Kees Cook