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

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Message-ID: <CAK7LNAQT8jEHt39xG7BvMMWjObdvCCpPhJAA83LFut4ewUVQsg@mail.gmail.com>
Date:   Wed, 21 Feb 2018 01:00:39 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Richard Weinberger <richard@....at>
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

2018-02-21 0:25 GMT+09:00 Richard Weinberger <richard@....at>:
> 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`"


Same for Makefile
if a string symbol is referenced from Makefile, like

CONFIG_CROSS_COMPILE="$(shell echo hello > world)aarch64-linux-gnu-"



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

You do not need to do so.

This patch is so ugly.

Also, changed shell scripts have '#!/bin/sh' shebang,
but you are adding bash as a requirement.




-- 
Best Regards
Masahiro Yamada