linux-kernel - Re: [PATCH v2] powerpc/32: fix csum_partial_copy

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Date:	Fri, 05 Aug 2016 16:57:46 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Alessio Igor Bogani <alessio.bogani@...ttra.eu>,
	Scott Wood <oss@...error.net>
Cc:	Christophe Leroy <christophe.leroy@....fr>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...ts.ozlabs.org, stable@...r.kernel.org,
	antoine.blangy@....fr, segher@...nel.crashing.org
Subject: Re: [PATCH v2] powerpc/32: fix csum_partial_copy_generic()

Alessio Igor Bogani <alessio.bogani@...ttra.eu> writes:
> On 4 August 2016 at 05:53, Scott Wood <oss@...error.net> wrote:
>> On Tue, 2016-08-02 at 10:07 +0200, Christophe Leroy wrote:
>>> commit 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic()
>>> based on copy_tofrom_user()") introduced a bug when destination
>>> address is odd and initial csum is not null
>>>
>>> In that (rare) case the initial csum value has to be rotated one byte
>>> as well as the resulting value is
>>>
>>> This patch also fixes related comments
>>>
>>> Fixes: 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic()
>>> based on copy_tofrom_user()")
>>> Cc: stable@...r.kernel.org
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>> ---
>>>  v2: updated comments as suggested by Segher
>>>
>>>  arch/powerpc/lib/checksum_32.S | 7 ++++---
>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> Alessio, can you confirm whether this fixes the problem you reported?
>
> No unfortunately.

Thanks for testing.

I've dropped the patch for now, send me a new one that works.

cheers