Re: [PATCH v2] xfrm: policy: Fix xfrm policy match

[Xin Long]

On Tue, May 19, 2020 at 4:53 PM Steffen Klassert
<steffen.klassert@xxxxxxxxxxx> wrote:
>
> On Fri, May 15, 2020 at 04:39:57PM +0800, Yuehaibing wrote:
> >
> > Friendly ping...
> >
> > Any plan for this issue?
>
> There was still no consensus between you and Xin on how
> to fix this issue. Once this happens, I consider applying
> a fix.
>
Sorry, Yuehaibing, I can't really accept to do: (A->mark.m & A->mark.v)
I'm thinking to change to:

 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
                                   struct xfrm_policy *pol)
 {
-       u32 mark = policy->mark.v & policy->mark.m;
-
-       if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
-               return true;
-
-       if ((mark & pol->mark.m) == pol->mark.v &&
-           policy->priority == pol->priority)
+       if (policy->mark.v == pol->mark.v &&
+           (policy->mark.m == pol->mark.m ||
+            policy->priority == pol->priority))
                return true;

        return false;

which means we consider (the same value and mask) or
(the same value and priority) as the same one. This will
cover both problems.