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List:       linux-next
Subject:    Re: enabling COMPILE_TEST support for GCC plugins in v4.11
From:       Kees Cook <keescook () google ! com>
Date:       2016-12-16 21:05:51
Message-ID: CAGXu5j+25Mr7XofQbaMaP3iwiC8yKJwwk=ayU+fG=hq=bxNWzg () mail ! gmail ! com
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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
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