Re: ebtables broken for kernel above 2.6.28

[sachin sanap <sachin.sanap.1gb@gmail.com>]

I have checked it with older and new kernel. The patch to userspace
(ebtables) works fine for me on ARM32. If anyone wants me to do some
more specific testing for the patch let me know.

-Sachin Sanap

On Thu, Jun 18, 2009 at 10:03 PM, Bart De Schuymer<bdschuym@pandora.be> wrote:
> Jan Engelhardt schreef:
>>
>> Patrick McHardy wrote on  2009-06-02 12:20:45:
>>
>>>
>>> Jan Engelhardt wrote:
>>>
>>>>
>>>> Since the kernel uses xt_align already, it's best for userspace to do
>>>> the same.
>>>>
>>>
>>> But that doesn't work for older kernels. Please don't dismiss
>>> compatibility issues that easily. Sometimes things unfortunately
>>> do slip through, but I expect people to do their best to fix the
>>> problem properly when this happens.
>>>
>>
>> I compiled myself an ARM crosscompiler, just to see what's going on. Not
>> that I could run the binaries, but I could at least look at the objdump
>> output. The first impression was: "the state before the supposed regression
>> was introduced could not have worked on ARM in the first place had I run
>> this".
>>
>> It turns out that ebtables is completely unusable on at least three arches
>> with given ABI configurations even if things were still calculated against
>> ebt_replace instead of _xt_align. One case has been verified by me since
>> it's consumer hardware, and it surprises me the Debian project has not found
>> this earlier, because they actually produced one affected binary
>> distribution in the past (x86 with k64_u32).
>>
>> Affected arches are all with k64_u32. (Perhaps almost all — I did not
>> recall seeing it on sparc64, and, as I am just checking up on ebtables's
>> Makefile, it has a hack for sparc.) The other configuration I see problems
>> in is a (rather normal) k32_u32 ARM setup with a kernel compiled with
>> CONFIG_EABI=no.
>>
>> The userspace patch proposed by Sachin Nasap is, IMHO, one to fix the
>> alignment problems (both old and recent) in one clap.
>>
>
> Thanks, I'll have a look at it this weekend.
>
> cheers,
> Bart
>
>
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