linux-kernel - Re: Stack protector kernel build error

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Message-ID: <CAGXu5jLdBzv-SdVhJJ6AGrCV8TUEpK71S3FugEqxKRtYbcTbwQ@mail.gmail.com>
Date:   Sat, 14 Oct 2017 15:45:16 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Stack protector kernel build error

On Sat, Oct 14, 2017 at 12:53 PM, Robert Jarzmik <robert.jarzmik@...e.fr> wrote:
> Hi Kees,
>
> Today my linux-next build broke for the pxa architecture.
> My specific setup is :
>  - ARCH=arm make pxa_defconfig; ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- make
>  - my compiler is:
>         rj@...garion:~/mio_linux/kernel$ arm-linux-gnueabi-gcc --version
>         arm-linux-gnueabi-gcc (Debian 6.3.0-18) 6.3.0 20170516
>
> And the error message is :
> rj@...garion:~/mio_linux/kernel$ make -j 4
>   CHK     include/config/kernel.release
> CONFIG_CC_STACKPROTECTOR_AUTO: Compiler does not support any known stack-protector
> Cannot use CONFIG_CC_STACKPROTECTOR_AUTO: not supported by compiler
> Makefile:1097: recipe for target 'prepare-compiler-check' failed
> make: *** [prepare-compiler-check] Error 1
> make: *** Waiting for unfinished jobs....
> make: *** wait: No child processes.  Stop.
>
>
> Is this expected, as I was under the impression my compiler was not that
> outdated ...

Hmm, there's probably a bug in my attempt at making the ..._AUTO mode work.

What does "arm-linux-gnueabi-gcc -fstack-protector" say?

-Kees

-- 
Kees Cook
Pixel Security