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From: Michael Ellerman <mpe@ellerman.id.au>
To: Kees Cook <keescook@chromium.org>
Cc: LEROY Christophe <christophe.leroy@csgroup.eu>,
	kernel test robot <lkp@intel.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"linux-hardening@vger.kernel.org"
	<linux-hardening@vger.kernel.org>
Subject: Re: [PATCH] powerpc/signal32: Use struct_group() to zero spe regs
Date: Wed, 24 Nov 2021 11:08:25 +1100	[thread overview]
Message-ID: <8735nmquti.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <202111221247.B385EA2A8@keescook>

Kees Cook <keescook@chromium.org> writes:
> On Mon, Nov 22, 2021 at 04:43:36PM +1100, Michael Ellerman wrote:
>> LEROY Christophe <christophe.leroy@csgroup.eu> writes:
>> > Le 18/11/2021 à 21:36, Kees Cook a écrit :
>> >> In preparation for FORTIFY_SOURCE performing compile-time and run-time
>> >> field bounds checking for memset(), avoid intentionally writing across
>> >> neighboring fields.
>> >> 
>> >> Add a struct_group() for the spe registers so that memset() can correctly reason
>> >> about the size:
>> >> 
>> >>     In function 'fortify_memset_chk',
>> >>         inlined from 'restore_user_regs.part.0' at arch/powerpc/kernel/signal_32.c:539:3:
>> >>     >> include/linux/fortify-string.h:195:4: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
>> >>       195 |    __write_overflow_field();
>> >>           |    ^~~~~~~~~~~~~~~~~~~~~~~~
>> >> 
>> >> Reported-by: kernel test robot <lkp@intel.com>
>> >> Signed-off-by: Kees Cook <keescook@chromium.org>
>> >
>> > Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>> 
>> Acked-by: Michael Ellerman <mpe@ellerman.id.au>
>
> Thanks! Should I take this via my tree, or do you want to take it via
> ppc?

I don't mind. If it's easier for you to take it as part of an existing
series then do that, otherwise I can pick it up.

cheers

WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <mpe@ellerman.id.au>
To: Kees Cook <keescook@chromium.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	kernel test robot <lkp@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-hardening@vger.kernel.org"
	<linux-hardening@vger.kernel.org>,
	Paul Mackerras <paulus@samba.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] powerpc/signal32: Use struct_group() to zero spe regs
Date: Wed, 24 Nov 2021 11:08:25 +1100	[thread overview]
Message-ID: <8735nmquti.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <202111221247.B385EA2A8@keescook>

Kees Cook <keescook@chromium.org> writes:
> On Mon, Nov 22, 2021 at 04:43:36PM +1100, Michael Ellerman wrote:
>> LEROY Christophe <christophe.leroy@csgroup.eu> writes:
>> > Le 18/11/2021 à 21:36, Kees Cook a écrit :
>> >> In preparation for FORTIFY_SOURCE performing compile-time and run-time
>> >> field bounds checking for memset(), avoid intentionally writing across
>> >> neighboring fields.
>> >> 
>> >> Add a struct_group() for the spe registers so that memset() can correctly reason
>> >> about the size:
>> >> 
>> >>     In function 'fortify_memset_chk',
>> >>         inlined from 'restore_user_regs.part.0' at arch/powerpc/kernel/signal_32.c:539:3:
>> >>     >> include/linux/fortify-string.h:195:4: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
>> >>       195 |    __write_overflow_field();
>> >>           |    ^~~~~~~~~~~~~~~~~~~~~~~~
>> >> 
>> >> Reported-by: kernel test robot <lkp@intel.com>
>> >> Signed-off-by: Kees Cook <keescook@chromium.org>
>> >
>> > Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>> 
>> Acked-by: Michael Ellerman <mpe@ellerman.id.au>
>
> Thanks! Should I take this via my tree, or do you want to take it via
> ppc?

I don't mind. If it's easier for you to take it as part of an existing
series then do that, otherwise I can pick it up.

cheers

  reply	other threads:[~2021-11-24  0:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-18 20:36 [PATCH] powerpc/signal32: Use struct_group() to zero spe regs Kees Cook
2021-11-18 20:36 ` Kees Cook
2021-11-19  8:46 ` LEROY Christophe
2021-11-19 16:28   ` Kees Cook
2021-11-19 16:28     ` Kees Cook
2021-11-19 16:35     ` Christophe Leroy
2021-11-19 16:35       ` Christophe Leroy
2021-11-19 16:42       ` Kees Cook
2021-11-19 16:42         ` Kees Cook
2021-11-22  5:43   ` Michael Ellerman
2021-11-22  5:43     ` Michael Ellerman
2021-11-22 20:47     ` Kees Cook
2021-11-22 20:47       ` Kees Cook
2021-11-24  0:08       ` Michael Ellerman [this message]
2021-11-24  0:08         ` Michael Ellerman
2021-12-01 18:55         ` Kees Cook
2021-12-01 18:55           ` Kees Cook
2021-12-07 13:27 ` Michael Ellerman
2021-12-07 13:27   ` Michael Ellerman

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