linux-kernel - Re: enabling COMPILE_TEST support for GCC plugins in v4.11

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Date:   Fri, 16 Dec 2016 13:05:51 -0800
From:   Kees Cook <keescook@...gle.com>
To:     Emese Revfy <re.emese@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Randy Dunlap <rdunlap@...radead.org>,
        Olof Johansson <olof@...om.net>,
        Mark Brown <broonie@...nel.org>, info@...nelci.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Next <linux-next@...r.kernel.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Laura Abbott <labbott@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>, PaX Team <pageexec@...email.hu>
Subject: Re: enabling COMPILE_TEST support for GCC plugins in v4.11

On Sat, Dec 10, 2016 at 8:45 AM, Emese Revfy <re.emese@...il.com> wrote:
> On Fri, 9 Dec 2016 11:12:18 -0800
> Kees Cook <keescook@...gle.com> wrote:
>
>> On Fri, Dec 9, 2016 at 2:40 AM, Arnd Bergmann <arnd@...db.de> wrote:
>> > On Thursday, December 8, 2016 11:00:42 AM CET Kees Cook wrote:
>> >
>> >> If you have a moment, applying 215e2aa6c024[1] and reverting
>> >> a519167e753e for an allyesconfig/allmodconfig build should let you
>> >> know if things are working correctly with headers installed. If anyone
>> >> sees any problems, please let me know and I can queue up fixes.
>> >
>> > Using gcc-4.9.3 or gcc-5.3.1 for an ARM allmodconfig build, I get tons of
>> > errors such as this one:
>> >
>> > /git/arm-soc/init/initramfs.c: In function 'error':
>> > /git/arm-soc/init/initramfs.c:50:1: error: unrecognizable insn:
>> >  }
>> >  ^
>> > (insn 26 25 27 5 (set (reg:SI 111 [ local_entropy.243 ])
>> >         (rotatert:SI (reg:SI 116 [ local_entropy.243 ])
>> >             (const_int -30 [0xffffffffffffffe2]))) -1
>> >      (nil))
>> > *** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
>> > Event                            | Plugins
>> > PLUGIN_ATTRIBUTES                | latent_entropy_plugin
>> > PLUGIN_START_UNIT                | latent_entropy_plugin
>> > /git/arm-soc/init/initramfs.c:50:1: internal compiler error: in extract_insn, at recog.c:2202
>> > /git/arm-soc/arch/arm/vfp/vfpmodule.c: In function 'vfp_init':
>> > /git/arm-soc/arch/arm/vfp/vfpmodule.c:824:1: error: unrecognizable insn:
>> >  }
>> >  ^
>> > (insn 138 137 139 17 (set (reg:SI 165 [ local_entropy.93 ])
>> >         (rotatert:SI (reg:SI 150 [ local_entropy.93 ])
>> >             (const_int -9 [0xfffffffffffffff7]))) -1
>> >      (nil))
>> > *** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
>>
>> Well that's exciting! :P
>
> Hi,
>
> You can find the fix here:
> https://github.com/ephox-gcc-plugins/latent_entropy/commit/c91275a1bfcebbcfc0ca1af03396e06039f04db8

Great, thanks!

-Kees

-- 
Kees Cook
Nexus Security