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Old 06-08-2010, 02:05 PM
Stefan Bader
 
Default SRU: Fix for TCP stack bugs related to F-RTO

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/567394

SRU justification:

Impact: Several flaws in the F-RTO (forward retransmission timeout)
implementation in 2.6.24 which causes packets under certain circumstances
to get silently dropped while the client will accept longer and longer
re-transmit timeouts.
This can lead to resource exhaustion and thus to DOS vulnerability.
There is no CVE assigned to this issue and the class of change should likely
be done using the retention period in proposed. So this is submitted as a
normal proposed update.

Fix: This set of three patches which has been picked from 2.6.25.y has been
verified to cure the problem. Tester reported successful avoidance of the
problem with a test kernel provided and has seen no regressions.

Testcase: Unfortunately this seems to be observed only in a certain
environment and with certain steps which are not public.



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Old 06-08-2010, 08:42 PM
Steve Conklin
 
Default SRU: Fix for TCP stack bugs related to F-RTO

On Tue, 2010-06-08 at 16:05 +0200, Stefan Bader wrote:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/567394
>
> SRU justification:
>
> Impact: Several flaws in the F-RTO (forward retransmission timeout)
> implementation in 2.6.24 which causes packets under certain circumstances
> to get silently dropped while the client will accept longer and longer
> re-transmit timeouts.
> This can lead to resource exhaustion and thus to DOS vulnerability.
> There is no CVE assigned to this issue and the class of change should likely
> be done using the retention period in proposed. So this is submitted as a
> normal proposed update.
>
> Fix: This set of three patches which has been picked from 2.6.25.y has been
> verified to cure the problem. Tester reported successful avoidance of the
> problem with a test kernel provided and has seen no regressions.
>
> Testcase: Unfortunately this seems to be observed only in a certain
> environment and with certain steps which are not public.
>

ACK

Agreed that letting it bake in proposed is a good idea.

Steve
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Old 06-08-2010, 08:46 PM
Brad Figg
 
Default SRU: Fix for TCP stack bugs related to F-RTO

On 06/08/2010 07:05 AM, Stefan Bader wrote:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/567394
>
> SRU justification:
>
> Impact: Several flaws in the F-RTO (forward retransmission timeout)
> implementation in 2.6.24 which causes packets under certain circumstances
> to get silently dropped while the client will accept longer and longer
> re-transmit timeouts.
> This can lead to resource exhaustion and thus to DOS vulnerability.
> There is no CVE assigned to this issue and the class of change should likely
> be done using the retention period in proposed. So this is submitted as a
> normal proposed update.
>
> Fix: This set of three patches which has been picked from 2.6.25.y has been
> verified to cure the problem. Tester reported successful avoidance of the
> problem with a test kernel provided and has seen no regressions.
>
> Testcase: Unfortunately this seems to be observed only in a certain
> environment and with certain steps which are not public.
>
>
>

ACK

--
Brad Figg brad.figg@canonical.com http://www.canonical.com

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Old 06-08-2010, 10:56 PM
Stefan Bader
 
Default SRU: Fix for TCP stack bugs related to F-RTO

Applied to Hardy master

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