From 73d6722d2731009f933df654878137b0ff1563fd Mon Sep 17 00:00:00 2001
From: Kevin Lo <kevlo@FreeBSD.org>
Date: Sun, 16 May 2010 08:03:24 +0000
Subject: [PATCH] Use setresuid/setresgid to drop privileges

---
 sbin/bsdlabel/bsdlabel.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sbin/bsdlabel/bsdlabel.c b/sbin/bsdlabel/bsdlabel.c
index 9a6027c7951a..7f058747f246 100644
--- a/sbin/bsdlabel/bsdlabel.c
+++ b/sbin/bsdlabel/bsdlabel.c
@@ -684,6 +684,8 @@ editit(void)
 	int pid, xpid;
 	int locstat, omask;
 	const char *ed;
+	uid_t uid;
+	gid_t gid;
 
 	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 	while ((pid = fork()) < 0) {
@@ -699,8 +701,12 @@ editit(void)
 	}
 	if (pid == 0) {
 		sigsetmask(omask);
-		setgid(getgid());
-		setuid(getuid());
+		gid = getgid();
+		if (setresgid(gid, gid, gid) == -1)
+			err(1, "setresgid");
+		uid = getuid();
+		if (setresuid(uid, uid, uid) == -1)
+			err(1, "setresuid");
 		if ((ed = getenv("EDITOR")) == (char *)0)
 			ed = DEFEDITOR;
 		execlp(ed, ed, tmpfil, (char *)0);