From: Roy Marples <roy@marples.name>
Date: Wed, 20 May 2020 13:15:30 +0000 (+0100)
Subject: privsep: Add comment about BPF returing EPERM on OpenBSD.
X-Git-Tag: v9.1.0~47
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=40233274196ace0b2d429f7d628c3afdcda22b24;p=thirdparty%2Fdhcpcd.git

privsep: Add comment about BPF returing EPERM on OpenBSD.

Looks like an OpenBSD bug.
---

diff --git a/src/privsep-bpf.c b/src/privsep-bpf.c
index 43fee54b..d8cb7973 100644
--- a/src/privsep-bpf.c
+++ b/src/privsep-bpf.c
@@ -106,6 +106,13 @@ ps_bpf_recvmsg(void *arg)
 {
 	struct ps_process *psp = arg;
 
+	/*
+	 * OpenBSD-6.6 at least will return EPERM here for every
+	 * BOOTP sent except for the first one.
+	 * However with wih EPERM, the BOOTP message is *still* sent.
+	 * This means the BPF write filter isn't working as it should.
+	 * On FreeBSD it works fine.
+	 */
 	if (ps_recvpsmsg(psp->psp_ctx, psp->psp_fd,
 	    ps_bpf_recvmsgcb, arg) == -1)
 		logerr(__func__);