linux-ext4 - Re: [PATCH 2/2] ext4: ext4_discard_partial_page_buffers_no

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 13 Dec 2011 09:16:24 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Allison Henderson <achender@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org, Theodore Tso <tytso@....edu>,
	Jan Kara <jack@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH 2/2] ext4: ext4_discard_partial_page_buffers_no_lock()
 wrong parameters

On Tue, Dec 13, 2011 at 8:40 AM, Andrea Arcangeli <aarcange@...hat.com> wrote:
> Hi Allison,
>
> On Mon, Dec 12, 2011 at 01:07:47PM -0700, Allison Henderson wrote:
>> Hi Andrea,
>>
>> I think what Yongqiang means is that the code you are modifying is being
>> removed in the patches listed above and replaced with a different
>> solution.  The patches have not yet been merged so you will not see them
>> in a git tree yet, so you will need to apply them yourself.  If you are
>> not subscribed to the list, you can still find the patches here:
>>
>> http://www.spinics.net/lists/linux-ext4/msg29109.html
>> http://www.spinics.net/lists/linux-ext4/msg29110.html
>>
>> http://www.spinics.net/lists/linux-ext4/msg29375.html
>> http://www.spinics.net/lists/linux-ext4/msg29376.html
>
> Thanks for the links. Applied all 4.
>
>> We want to make sure the solution works for everyone, so please apply
>> these patches and let us know if it corrects the issues you are seeing.
>>   Thx!
>
> With all 4 patches applied, my 1/2 patch is still needed to avoid the
> hang and writes hangs all the time (but now they don't return -EINVAL
> anymore).
>
> My patch 2/2 is not needed with the above 4 patches applied so that
> can be discared if you apply the above 4 patches (but I suggest you
> check my patch 2/2 too because if it happens to be correct it could
> mean there's the potential of 1 byte data corruption in current
> upstream kernels in some circumstances, in addition to the -EINVAL
> failure in write()).
page_len is removed in the 2nd patch, so there is no problem related
to it any more.

Hi Andy and Hugh,

Andrea found the reason of EINVAL,  and the 2nd patch we have tested
can fix it.  Many thanks to Andrea.


Yongqiang.
>
> Let me know if you need me to test me anything else in relation to the
> copied=0 case.
>
> Thanks,
> Andrea



-- 
Best Wishes
Yongqiang Yang
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html