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Date:   Fri, 11 Oct 2019 09:09:22 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Michael Ellerman <mpe@ellerman.id.au>
Cc:     Borislav Petkov <bp@alien8.de>,
        Rick Edgecombe <rick.p.edgecombe@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Will Deacon <will@kernel.org>, linux-arch@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linuxppc-dev@lists.ozlabs.org, linux-alpha@vger.kernel.org,
        linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org,
        linux-c6x-dev@linux-c6x.org,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Michal Simek <monstr@monstr.eu>, linux-parisc@vger.kernel.org,
        linux-xtensa@linux-xtensa.org, x86@kernel.org,
        linux-kernel@vger.kernel.org, Joel Stanley <joel@jms.id.au>,
        Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [PATCH v2 02/29] powerpc: Remove PT_NOTE workaround
Message-ID: <201910110908.040009F27@keescook>
References: <20191011000609.29728-1-keescook@chromium.org>
 <20191011000609.29728-3-keescook@chromium.org>
 <878sprx1br.fsf@mpe.ellerman.id.au>
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On Fri, Oct 11, 2019 at 05:07:04PM +1100, Michael Ellerman wrote:
> Kees Cook <keescook@chromium.org> writes:
> > In preparation for moving NOTES into RO_DATA, remove the PT_NOTE
> > workaround since the kernel requires at least gcc 4.6 now.
> >
> > Signed-off-by: Kees Cook <keescook@chromium.org>
> > ---
> >  arch/powerpc/kernel/vmlinux.lds.S | 24 ++----------------------
> >  1 file changed, 2 insertions(+), 22 deletions(-)
> 
> Acked-by: Michael Ellerman <mpe@ellerman.id.au>

Thanks!

> For the archives, Joel tried a similar patch a while back which caused
> some problems, see:
> 
>   https://lore.kernel.org/linuxppc-dev/20190321003253.22100-1-joel@jms.id.au/
> 
> and a v2:
> 
>   https://lore.kernel.org/linuxppc-dev/20190329064453.12761-1-joel@jms.id.au/
> 
> This is similar to his v2. The only outstanding comment on his v2 was
> from Segher:
>   (And I do not know if there are any tools that expect the notes in a phdr,
>   or even specifically the second phdr).
> 
> But this patch solves that by not changing the note.

Ah yes. Agreed: I'm retaining the note and dropping the workarounds.
FWIW, this builds happily for me in my tests.

-Kees

-- 
Kees Cook