Re: [PATCH next 02/84] ipvs: Don't use current in proc_do_defense_mode

[ebiederm@xxxxxxxxxxxx (Eric W. Biederman)]

Simon Horman <horms@xxxxxxxxxxxx> writes:

> On Mon, Sep 21, 2015 at 01:01:39PM -0500, Eric W. Biederman wrote:
>> Instead store ipvs in extra2 so that proc_do_defense_mode can easily
>> find the ipvs that it's value is associated with.
>> 
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
>
> I am wondering if this fix should be included in v4.3 and stable.
> Can the problem occur in practice?

I believe a lookup in one network namespace followed by write in another
network namespace would do it.  So I think it would take so pretty
deliberate and more or less peculiar actions to make it happen.

I don't know how important the update_defense_level call is or how bad
it is if it does not run in a network namespace .

Eric
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