On Thu, Jul 20, 2023 at 5:24 AM Jakub Kicinski [off-list ref] wrote:

On Thu, 20 Jul 2023 03:17:37 +0000 Von Dentz, Luiz wrote:

quoted

Sorry for not replying inline, outlook on android, we use scm_recv
not scm_recv_unix, so Id assume that change would return the initial
behavior, if it did not then it is not fixing anything.

Ack, that's what it seems like to me as well.

I fired up an allmodconfig build of linux-next. I should be able
to get to the bottom of this in ~20min :)

Dear friends,

I'm here and ready to help with fixing this. As far as I understand
everything should work,
because in 817efd3cad74 ("Bluetooth: hci_sock: Forward credentials to monitor")
we have a call to scm_recv(sock, msg, &scm, flags). And scm_recv does
not use scm_pidfd_recv (and pidfd_prepare).

Please tell me if something is not working and which tree I should
take to reproduce it. I'm ready to dive into it.

Kind regards,
Alex