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From: Kees Cook <keescook@chromium.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Russell King <linux@armlinux.org.uk>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Eli Friedman <efriedma@quicinc.com>
Subject: Re: [PATCH v2 1/2] arm/build: Warn on orphan section placement
Date: Wed, 24 Jun 2020 12:43:41 -0700
Message-ID: <202006241242.9A6E0E2387@keescook> (raw)
In-Reply-To: <CAKwvOdmYa6V=W2eupEmHcuF8+479F8XHxm1NAo0s2N=sawbKAw@mail.gmail.com>

On Tue, Jun 23, 2020 at 05:03:46PM -0700, Nick Desaulniers wrote:
> On Mon, Jun 22, 2020 at 1:49 PM Kees Cook <keescook@chromium.org> wrote:
> > [...]
> > @@ -37,6 +38,13 @@
> >                 *(.idmap.text)                                          \
> >                 __idmap_text_end = .;                                   \
> >
> > +#define ARM_COMMON_DISCARD                                             \
> > +               *(.ARM.attributes)                                      \
> 
> I could have sworn that someone (Eli?) once told me that this section
> (.ARM.attributes) is used for disambiguating which ARM version or
> which optional extensions were used when compiling, and that without
> this section, one would not be able to disassemble 32b ARM precisely.
> If that's the case, we might not want to discard it?

Perhaps we want to treat it like .comment and include it in the ELF?

> > +#define ARM_STUBS_TEXT                                                 \
> > +               *(.gnu.warning)                                         \
> > +               *(.glue_7t)                                             \
> > +               *(.glue_7)                                              \
> 
> This changes the order of .glue_7t relative to .glue_7.  Maybe that
> doesn't matter.

Good point. I'll swap it just for consistency.

Thanks!

-- 
Kees Cook

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-22 20:49 [PATCH v2 0/2] arm: " Kees Cook
2020-06-22 20:49 ` [PATCH v2 1/2] arm/build: " Kees Cook
2020-06-24  0:03   ` Nick Desaulniers
2020-06-24 19:43     ` Kees Cook [this message]
2020-06-26 21:36     ` Nick Desaulniers
2020-06-26 21:55       ` Kees Cook
2020-06-22 20:49 ` [PATCH v2 2/2] arm/boot: " Kees Cook
2020-06-24  0:08   ` Nick Desaulniers

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