linux-kernel - Re: more build problems with "Makefile: move stackprotector availability out of Kconfig"

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Date:   Tue, 17 Oct 2017 20:47:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: more build problems with "Makefile: move stackprotector
 availability out of Kconfig"

On Tue, Oct 17, 2017 at 8:41 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Tue, Oct 17, 2017 at 8:26 PM, Kees Cook <keescook@...omium.org> wrote:
>> On Tue, Oct 17, 2017 at 8:52 AM, Arnd Bergmann <arnd@...db.de> wrote:
>>> On Tue, Oct 17, 2017 at 5:34 PM, Kees Cook <keescook@...omium.org> wrote:
>
>>> index dbfb978..d5bc694 100755
>>> --- a/config.guess
>>> +++ b/config.guess
>>> @@ -1021,7 +1021,7 @@ EOF
>>>         echo ${UNAME_MACHINE}-dec-linux-${LIBC}
>>>         exit ;;
>>>      x86_64:Linux:*:*)
>>> -       echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
>>> +       echo ${UNAME_MACHINE}-pc-linux-${LIBC}
>>>         exit ;;
>>>      xtensa*:Linux:*:*)
>>>         echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
>>>
>>> I still don't know why that makes a difference, but all versions
>>> prior to gcc-6.1 have the problem for me.
>>
>> What happens if you add -mstack-protector-guard=tls ?
>
> With gcc-4.8 an earlier, I get build failure:
>
> cc1: error: unrecognized command line option "-mstack-protector-guard=tls"
>
> With gcc-4.9 and gcc-5, I get this output:
>

To clarify: with my gcc-4.9/gcc-5 build, -mstack-protector-guard=tls
has no effect,
the output is the same as with -mstack-protector-guard=global using the Ubuntu
compilers of the same version.

        Arnd