[SRU][Artful][Bionic][PATCH 0/2] Fixed for LP:1734327

Joseph Salisbury joseph.salisbury at canonical.com
Tue Feb 6 23:11:09 UTC 2018

On 02/06/2018 06:08 PM, Tetsuo Handa wrote:
> Joseph Salisbury wrote:
>> On 12/08/2017 06:02 PM, Tetsuo Handa wrote:
>>> Seth Forshee wrote:
>>>> On Fri, Dec 08, 2017 at 12:59:03PM -0500, Joseph Salisbury wrote:
>>>>> BugLink: http://bugs.launchpad.net/bugs/1734327
>>>>> == SRU Justification ==
>>>>> The following commit introduced a regression identified in bug 1734327:
>>>>> ac8f82a0b6d9 ("UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure management of the remaining blobs")
>>>>> The regression causes a kernel panic to occur after multiple TCP connection 
>>>>> creations/closures to the localhost.  The bug was found using STAF RPC calls, 
>>>>> but is easily reproducible with SSH.    
>>>>> A revert of commit ac8f82a0b6d9 is needed to resolve this bug.  However, commit 4ae2508f0bed
>>>>> also needs to be reverted because it depend on commit ac8f82a0b6d9.
>>>>> == Fix ==
>>>>> Revert 4ae2508f0bed ("UBUNTU: SAUCE: LSM stacking: add stacking support to apparmor network hooks")
>>>>> Revert ac8f82a0b6d9 ("UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure management of the remaining blobs")
>>>>> == Test Case ==
>>>>> A test kernel was built with these two commits reverted and tested by the original bug reporter.
>>>>> The bug reporter states the test kernel resolved the bug.
>>>> Two problems with the patches, they lack your s-o-b and they lack any
>>>> information about why they're being reverted in the commit message.
>>>> They also didn't apply cleanly on bionic/master-next (at least not the
>>>> first one, I didn't try the second), so I just reverted them directly
>>>> and pushed. I had to drop the whole series when rebasing to 4.15 so
>>>> there's nothing to revert in unstable.
>>> Isn't https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1734686 same bug where the patch
>>> is at http://kernsec.org/pipermail/linux-security-module-archive/2017-December/004638.html ?
>> Hi Tetsuo,
>> I don't see that your patch landed in mainline as of yet.? Did you ever
>> receive any feedback from upstream?
> LSM stacking is currently UBUNTU: SAUCE: patches. Since LSM stacking patchset has
> not landed in mainline, neither my bugfix patch. But I got effectively-an-ACK from
> author of LSM stacking patchset (Casey Schaufler):
> http://kernsec.org/pipermail/linux-security-module-archive/2017-December/004645.html .

Thank for the response, Tetsuo.  I'm going to NAK my revert requests for
the bug and instead have your patchset tested out.



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