Re: Issue with iwd + Linux 5.8.3 + WPA Enterprise

On Wed, Aug 26, 2020 at 12:40:14PM +0200, Ard Biesheuvel wrote:

It would be helpful if someone could explain for the non-mac80211 enlightened readers how iwd's EAP-PEAPv0 + MSCHAPv2 support relies on the algif_aead socket interface, and which AEAD algorithms it uses. I assume this is part of libell?

I see the problem. libell/ell/checksum.c doesn't clear the MSG_MORE flag before doing the recv(2).

I was hoping nobody out there was doing this but obviously I've been proven wrong.

So what I'm going to do is to specifically allow this case of a string of sendmsg(2)'s with MSG_MORE folloed by a recvmsg(2) in the same thread. I'll add a WARN_ON_ONCE so user-space can eventually be fixed.

Cheers,