Subject: Re: [PATCH bpf-next] samples/bpf: check detach prog exist or not in xdp_fwd

From: Toke Høiland-Jørgensen <[email-masked]>
Date: Mon, 09 May 2022 11:46:20 +0200

Zhengchao Shao <[email-masked]> writes:

> Before detach the prog, we should check detach prog exist or not.

If we're adding such a check we should also check that it's the *right*
program. I.e., query the ID for the program name and check that it
matches what the program attached, then obtain an fd and pass that as
XDP_EXPECTED_FD on detach to make sure it wasn't swapped out in the
meantime...

-Toke