Re: [PATCH v2] unix: properly account for FDs passed over unix sockets

On Tue, Feb 02, 2016 at 09:32:56PM +0100, Hannes Frederic Sowa wrote:

But "struct pid *" in unix_skb_parms should be enough to get us to 
corresponding "struct cred *" so we can decrement the correct counter 
during skb destruction.

So:

We increment current task's unix_inflight and also check the current 
task's limit during attaching fds to skbs and decrement the inflight 
counter via "struct pid *". This looks like it should work.

I like it as well, the principle sounds sane.

quoted

That way it's always the person who actually does the send (rather
than the opener of the socket _or_ the opener of the file that gets
passed around) that gets credited, and thanks to the cred pointer we
can then de-credit them properly.

Exactly, I try to implement that. Thanks a lot!

Thanks to you Hannes, I appreciate that you work on it, it would take
much more time to me to dig into this.

Willy