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Message-ID: <20160712220853.GU1041@n2100.armlinux.org.uk>
Date: Tue, 12 Jul 2016 23:08:53 +0100
From: Russell King - ARM Linux <linux@...linux.org.uk>
To: Kees Cook <keescook@...omium.org>
Cc: Emese Revfy <re.emese@...il.com>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
PaX Team <pageexec@...email.hu>,
Brad Spengler <spender@...ecurity.net>,
Michal Marek <mmarek@...e.com>, LKML <linux-kernel@...r.kernel.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-kbuild <linux-kbuild@...r.kernel.org>, minipli@...linux.so,
Catalin Marinas <catalin.marinas@....com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
David Brown <david.brown@...aro.org>,
"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Jeff Layton <jlayton@...chiereds.net>,
Arnd Bergmann <arnd@...db.de>, Sam Ravnborg <sam@...nborg.org>,
Karsten Keil <isdn@...ux-pingi.de>
Subject: Re: [PATCH v2 1/3] Add the initify gcc plugin
On Tue, Jul 12, 2016 at 03:45:56PM -0400, Kees Cook wrote:
> On Mon, Jul 4, 2016 at 7:40 PM, Emese Revfy <re.emese@...il.com> wrote:
> > If a function is called by __init and __exit functions as well then
> > the plugin moves it to the __exit section. This causes false positive
> > section mismatch errors/warnings that I don't know how to handle yet.
>
> Should the mismatch checker be updated to recognize this case? Without
> the plugin, I assume these kinds of functions would only ever be
> marked for __exit? If so, should the plugin strip the __init marking
> and only add __exit?
That sounds like a problem for architectures that still discard the
__exit section at link time to reduce the size of the linked kernel
image - though, obviously, if using the plugin results in a smaller
kernel image _with_ the exit sections, then there's a net benefit
size-wise.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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