Hi Daniel,
> [ Cc'ing John, Daniel, et al ]
>
> Btw, while I just looked at scm_detach_fds(), I think commits ...
>
> * 48a87cc26c13 ("net: netprio: fd passed in SCM_RIGHTS datagram not set
> correctly")
> * d84295067fc7 ("net: net_cls: fd passed in SCM_RIGHTS datagram not set
> correctly")
>
> ... might not be correct, maybe I'm missing something ...? Lets say
> process A
> has a socket fd that it sends via SCM_RIGHTS to process B. Process A was
> the
> one that called sk_alloc() originally. Now in scm_detach_fds() we
> install a new
> fd for process B pointing to the same sock (file's private_data) and
> above commits
> update the cached socket cgroup data for net_cls/net_prio to the new
> process B.
> So, if process A for example still sends data over that socket, skbs
> will then
> wrongly match on B's cgroup membership instead of A's, no?
I can't remember the details right now (need to read up again but I wont
have time till Wednesday).
>From your analysis I would say that is not the desired effect. A should
match against its own cgroup and not the one of B.
cheers,
daniel
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