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Message-Id: <20160713232614.94c653f7eb415d8f969a11c0@gmail.com>
Date: Wed, 13 Jul 2016 23:26:14 +0200
From: Emese Revfy <re.emese@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: Russell King - ARM Linux <linux@...linux.org.uk>,
"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, 12 Jul 2016 18:38:47 -0400
Kees Cook <keescook@...omium.org> wrote:
> On Tue, Jul 12, 2016 at 6:08 PM, Russell King - ARM Linux
> <linux@...linux.org.uk> wrote:
> > 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:
> > 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.
>
> Ah right, __exit is dropped for non-modular builds. So, for "both
> __init and __exit" it sounds like the behavior depends on the build:
>
> - if modular: remove __init marking (since we need it after init)
> - if non-modular: remove __exit marking (since we'll never call exit)
When gcc compiles vmlinux these functions should be in __init and when
it compiles *.ko then they can be in __exit. I have no time to do this
now but I added it to my todo list.
The temporary fix can be that I enable this section move only on x86
(on other archs it will decrase the coverage).
--
Emese
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