Re: [PATCH net-next] scm: fix MSG_CTRUNC setting condition for SO_PASSSEC

[Eric Dumazet]

On Sun, Feb 26, 2023 at 9:17 PM Alexander Mikhalitsyn
<aleksandr.mikhalitsyn@xxxxxxxxxxxxx> wrote:
>
> Currently, we set MSG_CTRUNC flag is we have no
> msg_control buffer provided and SO_PASSCRED is set
> or if we have pending SCM_RIGHTS.
>
> For some reason we have no corresponding check for
> SO_PASSSEC.

Can you describe what side effects this patch has ?

I think it could break some applications, who might not be able to
recover from MSG_CTRUNC in this case.
This should be documented, in order to avoid a future revert.

In any case, net-next is currently closed.