Re: Questions about backports of fixes for "CoW after fork() issue"

[Liu Shixin <liushixin2@huawei.com>]

On 2021/6/16 15:11, Suren Baghdasaryan wrote:
> On Tue, Jun 15, 2021 at 11:52 PM Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
>> On Wed, Jun 16, 2021 at 02:47:15PM +0800, Liu Shixin wrote:
>>> Hi, Suren,
>>>
>>> I read the previous discussion about fixing CVE-2020-29374 in stable 4.14 and 4.19 in
>>> <https://lore.kernel.org/linux-mm/20210401181741.168763-1-surenb@google.com/>
>>>
>>> https://lore.kernel.org/linux-mm/20210401181741.168763-1-surenb@google.com/
>>>
>>> And the results of the discussion is that you backports of 17839856fd58 for 4.14 and
>>>
>>> 4.19 kernels.
>>>
>>> But the bug about dax and strace in the discussion has not been solved, right? I don't
>>>
>>> find a conclusion on this issue, am I missing something? Does this problem still exist in
>>>
>>> the stable 4.14 and 4.19 kernel?
> That is my understanding after discussions with Andrea but I did not
> verify that myself. As Greg pointed out, the best way would be to try
> it out.
> Thanks,
> Suren.
>
>> As the code is all there for you, can you just test them and see for
>> yourself?
>>
>> thanks,
>>
>> greg k-h
> .
>
Thank you both for replies. I have tested it in stable 4.19 kernel and the bug is existed as expected.

Thanks,
Liu Shixin