glibc 2.14-4 eats my data (Re: F15 ext3, eCryptfs + samba = data corruption (Re: F15 "Error mounting eCryptfs: [-5] Input/output error" on different disks))

[Michał Piotrowski]

W dniu 12 lipca 2011 18:23 użytkownik Michal Hlavinka
<mhlavink at redhat.com> napisał:
>>>>>>> ok, complain about memcpy in ecryptfs-utils is gone. I've checked all
>>>>>>> of
>>>>>>> them and I think I've fixed those which needed it. I was not able to
>>>>>>> reproduce original problem nor valgrind complaint, so please test if
>>>>>>> following package produces memcpy complain in valgrind output or not:
>>>>>>>
>>>>>>> http://kojipkgs.fedoraproject.org/scratch/mhlavink/task_3190860/
>>>>>>
>>>>>> Your mtab handling patch fixed both issues - mount warning and data
>>>>>> corruption :) Huge thanks!
>>>>>
>>>>> I can't imagine *how* it could affect this, so I'd advice to monitor it
>>>>> carefully if it is fixed for real.
>>>>
>>>> Ok, so I will do. Before each time I mounted ecryptfs I get this
>>>> "Error mounting eCryptfs: [-5] Input/output error" error. Now it's
>>>> gone - I tried a few times.
>>>
>>> yes, this is related to mtab patch, but it mounted it anyway. I was able
>>> to
>>> reproduce this warning. It should not affect smb+ecryptfs data corruption
>>> in
>>> any way.
>>
>> I uploaded another large file (>  1 GB) and unfortunately data
>> corruption problem still exist - I do not know why it worked
>> previously.
>>
>
> this was expected. ecryptfs-utils is really just a mount helper, but thanks
> memcpy bug in ecryptfs-utils was fixed, glibc/samba can get its attention
> without distractions
>
> You can test that samba build I've sent you.

I tested it, but it still corrupts data. On Thursday I'll do more
tests. Data corruption does not happen always, so now I'm not too sure
whether this has to do with eCryptfs itself. May simply not happened
when I tested samba on not encrypted filesystem.

> I'll try to reproduce this too,
> but this requires someone with better knowledge of glibc/samba where I can't
> help too much.
>
> Michal
>



-- 
Best regards,
Michal

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