linux-kernel - Re: [BUG v5.2-rc1] ARM build broken

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Message-ID: <201905200855.391A921AB@keescook>
Date:   Mon, 20 May 2019 08:59:50 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [BUG v5.2-rc1] ARM build broken

On Mon, May 20, 2019 at 05:15:02PM +0200, H. Nikolaus Schaller wrote:
> Hi,
> it seems as if ARM build is broken since ARM now hard enables CONFIG_HAVE_GCC_PLUGINS
> which indirectly enables CONFIG_GCC_PLUGIN_ARM_SSP_PER_TASK. Compiling this breaks
> on my system (Darwin build host) due to conflicts in system headers and Linux headers.
> 
> So how can I turn off all these GCC_PLUGINS?
> 
> The offending patch seems to be
> 
> 	security: Create "kernel hardening" config area
> 
> especially the new "default y" for GCC_PLUGINS. After removing that line from
> scripts/gcc-plugins/Kconfig makes my compile succeed.

The intention is to enable it _if_ the plugins are available as part of
the build environment. The "default y" on GCC_PLUGINS is mediated by:
        depends on HAVE_GCC_PLUGINS
        depends on PLUGIN_HOSTCC != ""

So it seems that something isn't working in the plugin detection maybe?
Can you send your build error, compiler version, .config, etc? I've not
been able to reproduce this problem. (And I'm not aware of any of the
automated build systems failing in this area yet either...) Perhaps it's
something specific to building under Darwin?

Thanks!

-- 
Kees Cook