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 [thread overview]
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
next prev parent reply other threads:[~2020-06-24 19:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 20:49 [PATCH v2 0/2] arm: Warn on orphan section placement 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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