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Date: Wed, 15 Jun 2016 15:41:28 -0700
From: Kees Cook <keescook@...omium.org>
To: Emese Revfy <re.emese@...il.com>
Cc: Laura Abbott <labbott@...hat.com>, linux-kbuild <linux-kbuild@...r.kernel.org>,
PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Michal Marek <mmarek@...e.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>, Fengguang Wu <fengguang.wu@...el.com>,
Dmitry Vyukov <dvyukov@...gle.com>, LKML <linux-kernel@...r.kernel.org>,
David Brown <david.brown@...aro.org>, Masahiro Yamada <yamada.masahiro@...ionext.com>,
minipli@...linux.so
Subject: Re: [PATCH v9 3/4] Add Cyclomatic complexity GCC plugin
On Wed, Jun 15, 2016 at 1:53 PM, Emese Revfy <re.emese@...il.com> wrote:
> On Tue, 14 Jun 2016 12:29:59 -0700
> Laura Abbott <labbott@...hat.com> wrote:
>
>> On 05/23/2016 03:10 PM, Emese Revfy wrote:
>> 1) make mrproper
>> 2) make defconfig
>> 3) enable GCC_PLUGINS, GCC_PLUGIN_CYC_COMPLEXITY
>> 4) enable FUNCTION_TRACER (it will select other options as well)
>> 5) make && make modules
>>
>> ERROR: "__fentry__" [net/ipv4/netfilter/ipt_MASQUERADE.ko] undefined!
>> ERROR: "__fentry__" [fs/efivarfs/efivarfs.ko] undefined!
>> ERROR: "__fentry__" [drivers/thermal/x86_pkg_temp_thermal.ko] undefined!
>> scripts/Makefile.modpost:91: recipe for target '__modpost' failed
>> make[1]: *** [__modpost] Error 1
>
> The patch below fixes this bug, but I think it is ugly.
> https://github.com/ephox-gcc-plugins/gcc-plugins_linux-next/commit/73e2d117daa7f3c6aee8935ecbb318354ff9cd82
>
> If anyone has a better idea to fix this, please let me know.
I think the logic looks fine, but I think I would name it more
generically. For example, call it something plugin-agnostic like
KBUILD_CFLAGS_MINIMUM.
I actually wonder if I can use this same logic to fix the stack
protector detection code...
-Kees
--
Kees Cook
Chrome OS & Brillo Security
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