linux-kernel - Re: [PATCH v2] kbuild: Don't source kernel config

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Message-ID: <14335276.CH3Xr2i6I8@blindfold>
Date:   Tue, 20 Feb 2018 16:25:32 +0100
From:   Richard Weinberger <richard@....at>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>, david@...ma-star.at,
        kbuild-all@...org, Sam Ravnborg <sam@...nborg.org>,
        Arnaud Lacombe <lacombar@...il.com>,
        Nick Bowler <nbowler@...iptictech.com>,
        Michal Marek <mmarek@...e.cz>, Nicolas Pitre <nico@...aro.org>,
        Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH v2] kbuild: Don't source kernel config

Am Dienstag, 20. Februar 2018, 16:18:11 CET schrieb Masahiro Yamada:
> 2018-02-19 18:22 GMT+09:00 Richard Weinberger <richard@....at>:
> > Don't source the kernel config file in shell scripts.
> > The config file is not a shell script and often imported from untrusted
> > sources.
> > What could possible go wrong? ;-)
> 
> Please enumerate your real problems.

Build a kernel where the .config contains something like:
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="`echo hello > world`"

I'll send a v3 because I forgot to convert one function in the shell script to 
the new bash array. kbuild bot FTW. :-)

Thanks,
//richard