From afb94ecf2bb6c53ce2a381d6ce45a426243c76d9 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Sun, 16 Jul 2006 08:06:34 +0000
Subject: [PATCH] Convert setuid/setgid users to xsetuid/xsetgid.

---
 loginutils/passwd.c     | 5 +----
 networking/arping.c     | 3 ++-
 networking/ether-wake.c | 2 +-
 networking/fakeidentd.c | 4 ++--
 networking/inetd.c      | 6 +++---
 networking/traceroute.c | 8 +++-----
 6 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 5b828dfee..7745444c0 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -227,10 +227,7 @@ int passwd_main(int argc, char **argv)
 	signal(SIGINT, SIG_IGN);
 	signal(SIGQUIT, SIG_IGN);
 	umask(077);
-	if (setuid(0)) {
-		syslog(LOG_ERR, "can't setuid(0)");
-		bb_error_msg_and_die( "Cannot change ID to root.\n");
-	}
+	xsetuid(0);
 	if (!update_passwd(pw, crypt_passwd)) {
 		syslog(LOG_INFO, "password for `%s' changed by user `%s'", name,
 			   myname);
diff --git a/networking/arping.c b/networking/arping.c
index 6cb607612..5665ddb2b 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -262,7 +262,8 @@ int arping_main(int argc, char **argv)
 	s = socket(PF_PACKET, SOCK_DGRAM, 0);
 	ifindex = errno;
 
-	setuid(getuid());
+	// Drop suid root privileges
+	xsetuid(getuid());
 
 	{
 		unsigned long opt;
diff --git a/networking/ether-wake.c b/networking/ether-wake.c
index b4fb0c2d1..1803d2265 100644
--- a/networking/ether-wake.c
+++ b/networking/ether-wake.c
@@ -145,7 +145,7 @@ int etherwake_main(int argc, char *argv[])
 	s = make_socket();
 
 	/* now that we have a raw socket we can drop root */
-	setuid(getuid());
+	xsetuid(getuid());
 
 	/* look up the dest mac address */
 	get_dest_addr(argv[optind], &eaddr);
diff --git a/networking/fakeidentd.c b/networking/fakeidentd.c
index b5b70f516..9cdbc5725 100644
--- a/networking/fakeidentd.c
+++ b/networking/fakeidentd.c
@@ -159,8 +159,8 @@ static int godaemon(void)
 
 		close(0);
 		inetbind();
-		if (setgid(nogrp))   bb_error_msg_and_die("Could not setgid()");
-		if (setuid(nobody))  bb_error_msg_and_die("Could not setuid()");
+		xsetgid(nogrp);
+		xsetuid(nobody);
 		close(1);
 		close(2);
 
diff --git a/networking/inetd.c b/networking/inetd.c
index d50bbd39a..54294b635 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -1513,11 +1513,11 @@ inetd_main (int argc, char *argv[])
 			  if (sep->se_group) {
 				pwd->pw_gid = grp->gr_gid;
 			  }
-			  setgid ((gid_t) pwd->pw_gid);
+			  xsetgid ((gid_t) pwd->pw_gid);
 			  initgroups (pwd->pw_name, pwd->pw_gid);
-			  setuid ((uid_t) pwd->pw_uid);
+			  xsetuid((uid_t) pwd->pw_uid);
 			} else if (sep->se_group) {
-			  setgid (grp->gr_gid);
+			  xsetgid(grp->gr_gid);
 			  setgroups (1, &grp->gr_gid);
 			}
 			dup2 (ctrl, 0);
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 79f3957a6..c2084fc1e 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -941,7 +941,6 @@ traceroute_main(int argc, char *argv[])
 #endif
 	u_short off = 0;
 	struct IFADDRLIST *al;
-	int uid = getuid();
 	char *device = NULL;
 	int max_ttl = 30;
 	char *max_ttl_str = NULL;
@@ -1010,8 +1009,7 @@ traceroute_main(int argc, char *argv[])
 	     * set the ip source address of the outbound
 	     * probe (e.g., on a multi-homed host).
 	     */
-	     if (uid)
-		bb_error_msg_and_die("-s %s: Permission denied", source);
+	     if (getuid()) bb_error_msg_and_die("-s %s: Permission denied", source);
 	}
 	if(waittime_str)
 		waittime = str2val(waittime_str, "wait time", 2, 24 * 60 * 60);
@@ -1160,8 +1158,8 @@ traceroute_main(int argc, char *argv[])
 		    sizeof(on));
 
 	/* Revert to non-privileged user after opening sockets */
-	setgid(getgid());
-	setuid(uid);
+	xsetgid(getgid());
+	xsetuid(getuid());
 
 	outip = (struct ip *)xcalloc(1, (unsigned)packlen);
 
-- 
2.25.1