Date:   Mon, 27 Sep 2021 09:12:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ross Burton <Ross.Burton@....com>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] scripts/gcc-plugins: consistently use HOSTCC

On Mon, Sep 27, 2021 at 03:25:19PM +0000, Ross Burton wrote:
> Hm, yes, I think I managed to misunderstand something and fixed one build whilst breaking another.
> 
> Kees, can you drop this?  I’ll come back with a v2.

Sure! Dropped from -next.

-Kees

> 
> Ross
> 
> From: Dmitry Osipenko <digetx@...il.com>
> Date: Monday, 27 September 2021 at 16:10
> To: Kees Cook <keescook@...omium.org>, Ross Burton <Ross.Burton@....com>, linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>, linux-hardening@...r.kernel.org <linux-hardening@...r.kernel.org>
> Subject: Re: [PATCH] scripts/gcc-plugins: consistently use HOSTCC
> 24.09.2021 00:28, Kees Cook пишет:
> > On Thu, 23 Sep 2021 16:28:11 +0100, Ross Burton wrote:
> >> The GCC plugins are built using HOSTCC, but the path to the GCC plugins
> >> headers is obtained using CC.  This can lead to interesting failures if
> >> the host compiler and cross compiler are different versions, and the
> >> host compiler uses the cross headers.
> >
> > (I changed this from HOSTCC to HOSTCXX to match the other invocations.)
> >
> > Applied to for-next/gcc-plugins, thanks!
> >
> > [1/1] scripts/gcc-plugins: consistently use HOSTCC
> >       https://git.kernel.org/kees/c/ef5ecb129791
> >
> 
> I'm getting these errors when compiling ARM32 kernel using today's -next:
> 
> cc1: error: incompatible gcc/plugin versions
> cc1: error: failed to initialize plugin ./scripts/gcc-plugins/arm_ssp_per_task_plugin.so
> 
> Both host and cross compiler are the same version:
> 
> # gcc-config -l
>  [1] armv7a-hardfloat-linux-gnueabi-9.3.0
>  [2] armv7a-hardfloat-linux-gnueabi-10.3.0
>  [3] armv7a-hardfloat-linux-gnueabi-11.1.0 *
> 
>  [4] x86_64-pc-linux-gnu-11.1.0 *
> 
> # gcc -v
> Используются внутренние спецификации.
> COLLECT_GCC=gcc
> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/11.1.0/lto-wrapper
> Целевая архитектура: x86_64-pc-linux-gnu
> Параметры конфигурации: /var/tmp/portage/sys-devel/gcc-11.1.0-r2/work/gcc-11.1.0/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/11.1.0 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.1.0 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.1.0/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.1.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/include/g++-v11 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/11.1.0/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --disable-libunwind-exceptions --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 11.1.0-r2 p3' --disable-esp --enable-libstdcxx-time --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all --enable-libgomp --disable-libssp --disable-libada --disable-systemtap --disable-valgrind-annotations --disable-vtable-verify --disable-libvtv --without-zstd --enable-lto --with-isl --disable-isl-version-check --enable-default-pie --enable-default-ssp
> Модель многопоточности: posix
> Supported LTO compression algorithms: zlib
> gcc версия 11.1.0 (Gentoo 11.1.0-r2 p3)
> 
> # armv7a-hardfloat-linux-gnueabi-gcc -v
> Используются внутренние спецификации.
> COLLECT_GCC=armv7a-hardfloat-linux-gnueabi-gcc
> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/armv7a-hardfloat-linux-gnueabi/11.1.0/lto-wrapper
> Целевая архитектура: armv7a-hardfloat-linux-gnueabi
> Параметры конфигурации: /var/tmp/portage/cross-armv7a-hardfloat-linux-gnueabi/gcc-11.1.0-r2/work/gcc-11.1.0/configure --host=x86_64-pc-linux-gnu --target=armv7a-hardfloat-linux-gnueabi --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/armv7a-hardfloat-linux-gnueabi/gcc-bin/11.1.0 --includedir=/usr/lib/gcc/armv7a-hardfloat-linux-gnueabi/11.1.0/include --datadir=/usr/share/gcc-data/armv7a-hardfloat-linux-gnueabi/11.1.0 --mandir=/usr/share/gcc-data/armv7a-hardfloat-linux-gnueabi/11.1.0/man --infodir=/usr/share/gcc-data/armv7a-hardfloat-linux-gnueabi/11.1.0/info --with-gxx-include-dir=/usr/lib/gcc/armv7a-hardfloat-linux-gnueabi/11.1.0/include/g++-v11 --with-python-dir=/share/gcc-data/armv7a-hardfloat-linux-gnueabi/11.1.0/python --enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --disable-libunwind-exceptions --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 11.1.0-r2 p3' --disable-esp --enable-libstdcxx-time --enable-poison-system-directories --with-sysroot=/usr/armv7a-hardfloat-linux-gnueabi --disable-bootstrap --enable-__cxa_atexit --enable-clocale=gnu --disable-multilib --disable-fixed-point --with-float=hard --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16 --enable-libgomp --disable-libssp --disable-libada --disable-systemtap --disable-valgrind-annotations --disable-vtable-verify --disable-libvtv --without-zstd --enable-lto --with-isl --disable-isl-version-check --enable-default-pie --enable-default-ssp
> Модель многопоточности: posix
> Supported LTO compression algorithms: zlib
> gcc версия 11.1.0 (Gentoo 11.1.0-r2 p3)
> 
> 
> Please fix, thanks in advance.
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-- 
Kees Cook

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