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From: Rick Macklem <rmacklem@FreeBSD.org>
Date: Mon, 15 Oct 2012 13:38:25 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r241582 - head/sys/rpc/rpcsec_gss
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Author: rmacklem
Date: Mon Oct 15 13:38:25 2012
New Revision: 241582
URL: http://svn.freebsd.org/changeset/base/241582

Log:
  Add a comment describing why r241097 was done.
  
  Suggested by:	rwatson
  MFC after:	1 week

Modified:
  head/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c

Modified: head/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c
==============================================================================
--- head/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c	Mon Oct 15 13:20:08 2012	(r241581)
+++ head/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c	Mon Oct 15 13:38:25 2012	(r241582)
@@ -1024,6 +1024,17 @@ svc_rpc_gss_validate(struct svc_rpc_gss_
 	if (maj_stat != GSS_S_COMPLETE) {
 		rpc_gss_log_status("gss_verify_mic", client->cl_mech,
 		    maj_stat, min_stat);
+		/*
+		 * Attila Bogar and Herbert Poeckl reported similar problems
+		 * w.r.t. a Linux NFS client doing a krb5 NFS mount against the
+		 * FreeBSD server. We determined this was a Linux bug:
+		 * http://www.spinics.net/lists/linux-nfs/msg32466.html, where
+		 * the mount failed to work because a Destroy operation with a
+		 * bogus encrypted checksum destroyed the authenticator handle.
+		 * Since the checksum is bogus (gss_verify_mic() failed), it
+		 * doesn't make sense to destroy the handle and not doing so
+		 * fixes the Linux mount.
+		 */
 		if (gcproc != RPCSEC_GSS_DESTROY)
 			client->cl_state = CLIENT_STALE;
 		return (FALSE);