Add vendor patch to correctly drop group privileges when changing uid.

svn path=/head/; revision=55050

net/rsync/Makefile

@@ -8,7 +8,7 @@
 
 PORTNAME=	rsync
 PORTVERSION=	2.5.2
-PORTREVISION=	0
+PORTREVISION=	1
 CATEGORIES=	net ipv6
 MASTER_SITES=	ftp://samba.anu.edu.au/pub/rsync/  \
 		ftp://sunsite.auc.dk/pub/unix/rsync/  \

net/rsync/files/patch-clientserver.c

@@ -0,0 +1,27 @@
+--- clientserver.c	7 Feb 2002 16:36:12 -0000	1.82
++++ clientserver.c	21 Feb 2002 00:45:48 -0000	1.86
+@@ -282,6 +285,24 @@
+ 	}
+ 
+ 	if (am_root) {
++		/* Get rid of any supplementary groups this process
++		 * might have inheristed. */
++		if (setgroups(0, NULL)) {
++			rsyserr(FERROR, errno, "setgroups failed");
++			io_printf(fd, "@ERROR: setgroups failed\n");
++			return -1;
++		}
++
++		/* XXXX: You could argue that if the daemon is started
++		 * by a non-root user and they explicitly specify a
++		 * gid, then we should try to change to that gid --
++		 * this could be possible if it's already in their
++		 * supplementary groups. */
++
++		/* TODO: Perhaps we need to document that if rsyncd is
++		 * started by somebody other than root it will inherit
++		 * all their supplementary groups. */
++
+ 		if (setgid(gid)) {
+ 			rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
+ 			io_printf(fd,"@ERROR: setgid failed\n");