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From: Kees Cook <keescook@google.com>
Date: Fri, 16 Dec 2016 13:05:51 -0800
Message-ID: <CAGXu5j+25Mr7XofQbaMaP3iwiC8yKJwwk=ayU+fG=hq=bxNWzg@mail.gmail.com>
Subject: Re: enabling COMPILE_TEST support for GCC plugins in v4.11
To: Emese Revfy <re.emese@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Stephen Rothwell <sfr@canb.auug.org.au>,
        Randy Dunlap <rdunlap@infradead.org>, Olof Johansson <olof@lixom.net>,
        Mark Brown <broonie@kernel.org>, info@kernelci.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Will Deacon <will.deacon@arm.com>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux-Next <linux-next@vger.kernel.org>,
        Fengguang Wu <fengguang.wu@intel.com>,
        Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Laura Abbott <labbott@redhat.com>, "x86@kernel.org" <x86@kernel.org>,
        PaX Team <pageexec@freemail.hu>
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On Sat, Dec 10, 2016 at 8:45 AM, Emese Revfy <re.emese@gmail.com> wrote:
> On Fri, 9 Dec 2016 11:12:18 -0800
> Kees Cook <keescook@google.com> wrote:
>
>> On Fri, Dec 9, 2016 at 2:40 AM, Arnd Bergmann <arnd@arndb.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