Patch from Russell Coker:

    I've attached my latest SE Linux patch for busybox against the latest CVS
    version of busybox.

13 files changed, 263 insertions, 30 deletions

diff --git a/Makefile b/Makefile
index 300e4d8..83a53b8 100644
--- a/Makefile
+++ b/Makefile
@@ -31,6 +31,11 @@ DIRS:=applets archival archival/libunarchive coreutils console-tools \
 	networking/libiproute networking/udhcp procps loginutils shell \
 	sysklogd util-linux libbb libpwdgrp coreutils/libcoreutils
 
+ifeq ($(strip $(CONFIG_SELINUX)),y)
+CFLAGS += -I/usr/include/selinux
+LIBRARIES += -lsecure
+endif
+
 ifeq ($(strip $(HAVE_DOT_CONFIG)),y)
 
 all: busybox busybox.links #doc
diff --git a/coreutils/id.c b/coreutils/id.c
index 9b2d60d..971e7cd 100644
--- a/coreutils/id.c
+++ b/coreutils/id.c
@@ -28,9 +28,13 @@
 #include <getopt.h>
 #include <string.h>
 #include <sys/types.h>
+#ifdef CONFIG_SELINUX
+#include <proc_secure.h>
+#include <flask_util.h>
+#endif
 
-#define NO_GROUP          1
-#define NO_USER           2
+#define JUST_USER         1
+#define JUST_GROUP        2
 #define PRINT_REAL        4
 #define NAME_NOT_NUMBER   8
 
@@ -40,10 +44,13 @@ extern int id_main(int argc, char **argv)
 	long pwnam, grnam;
 	int uid, gid;
 	int flags;
+#ifdef CONFIG_SELINUX
+	int is_flask_enabled_flag = is_flask_enabled();
+#endif
 	
 	flags = bb_getopt_ulflags(argc, argv, "ugrn");
 
-	if (((flags & (NO_USER | NO_GROUP)) == (NO_USER | NO_GROUP))
+	if (((flags & (JUST_USER | JUST_GROUP)) == (JUST_USER | JUST_GROUP))
 		|| (argc > optind + 1)
 	) {
 		bb_show_usage();
@@ -67,9 +74,9 @@ extern int id_main(int argc, char **argv)
 	pwnam=my_getpwnam(user);
 	grnam=my_getgrnam(group);
 
-	if (flags & (NO_GROUP | NO_USER)) {
+	if (flags & (JUST_GROUP | JUST_USER)) {
 		char *s = group;
-		if (flags & NO_GROUP) {
+		if (flags & JUST_USER) {
 			s = user;
 			grnam = pwnam;
 		}
@@ -79,7 +86,24 @@ extern int id_main(int argc, char **argv)
 			printf("%ld\n", grnam);
 		}
 	} else {
+#ifdef CONFIG_SELINUX
+		printf("uid=%ld(%s) gid=%ld(%s)", pwnam, user, grnam, group);
+		if(is_flask_enabled_flag)
+		{
+			security_id_t mysid = getsecsid();
+			char context[80];
+			int len = sizeof(context);
+			context[0] = '\0';
+			if(security_sid_to_context(mysid, context, &len))
+				strcpy(context, "unknown");
+			printf(" context=%s\n", context);
+		}
+		else
+			printf("\n");
+#else
 		printf("uid=%ld(%s) gid=%ld(%s)\n", pwnam, user, grnam, group);
+#endif
+
 	}
 
 	bb_fflush_stdout_and_exit(0);
diff --git a/coreutils/ls.c b/coreutils/ls.c
index 4a49566..6245361 100644
--- a/coreutils/ls.c
+++ b/coreutils/ls.c
@@ -62,6 +62,11 @@ enum {
 #include <termios.h>
 #include <sys/ioctl.h>
 #include "busybox.h"
+#ifdef CONFIG_SELINUX
+#include <fs_secure.h>
+#include <flask_util.h>
+#include <ss.h>
+#endif
 
 #ifdef CONFIG_FEATURE_LS_TIMESTAMPS
 #include <time.h>
@@ -89,14 +94,15 @@ enum {
 #define LIST_NLINKS		(1U<<3)
 #define LIST_ID_NAME	(1U<<4)
 #define LIST_ID_NUMERIC	(1U<<5)
-#define LIST_SIZE		(1U<<6)
-#define LIST_DEV		(1U<<7)
-#define LIST_DATE_TIME	(1U<<8)
-#define LIST_FULLTIME	(1U<<9)
-#define LIST_FILENAME	(1U<<10)
-#define LIST_SYMLINK	(1U<<11)
-#define LIST_FILETYPE	(1U<<12)
-#define LIST_EXEC		(1U<<13)
+#define LIST_CONTEXT	(1U<<6)
+#define LIST_SIZE		(1U<<7)
+#define LIST_DEV		(1U<<8)
+#define LIST_DATE_TIME	(1U<<9)
+#define LIST_FULLTIME	(1U<<10)
+#define LIST_FILENAME	(1U<<11)
+#define LIST_SYMLINK	(1U<<12)
+#define LIST_FILETYPE	(1U<<13)
+#define LIST_EXEC	(1U<<14)
 
 #define LIST_MASK       ((LIST_EXEC << 1) - 1)
 
@@ -179,6 +185,9 @@ struct dnode {			/* the basic node */
 	char *name;			/* the dir entry name */
 	char *fullname;		/* the dir entry name */
 	struct stat dstat;	/* the file stat info */
+#ifdef CONFIG_SELINUX
+	security_id_t sid;
+#endif
 	struct dnode *next;	/* point at the next node */
 };
 typedef struct dnode dnode_t;
@@ -189,6 +198,10 @@ static int list_single(struct dnode *);
 
 static unsigned int all_fmt;
 
+#ifdef CONFIG_SELINUX
+static int is_flask_enabled_flag;
+#endif
+
 #ifdef CONFIG_FEATURE_AUTOWIDTH
 static unsigned short terminal_width = TERMINAL_WIDTH;
 static unsigned short tabstops = COLUMN_GAP;
@@ -203,26 +216,49 @@ static struct dnode *my_stat(char *fullname, char *name)
 {
 	struct stat dstat;
 	struct dnode *cur;
+#ifdef CONFIG_SELINUX
+	security_id_t sid;
+#endif
+	int rc;
 
 #ifdef CONFIG_FEATURE_LS_FOLLOWLINKS
 	if (all_fmt & FOLLOW_LINKS) {
-		if (stat(fullname, &dstat)) {
+#ifdef CONFIG_SELINUX
+		if(is_flask_enabled_flag)
+			rc = stat_secure(fullname, &dstat, &sid);
+		else
+#endif
+			rc = stat(fullname, &dstat);
+		if(rc)
+		{
 			bb_perror_msg("%s", fullname);
 			status = EXIT_FAILURE;
 			return 0;
 		}
 	} else
 #endif
-	if (lstat(fullname, &dstat)) {
-		bb_perror_msg("%s", fullname);
-		status = EXIT_FAILURE;
-	return 0;
+	{
+#ifdef CONFIG_SELINUX
+		if(is_flask_enabled_flag)
+			rc = lstat_secure(fullname, &dstat, &sid);
+		else
+#endif
+			rc = lstat(fullname, &dstat);
+		if(rc)
+		{
+			bb_perror_msg("%s", fullname);
+			status = EXIT_FAILURE;
+			return 0;
+		}
 	}
 
 	cur = (struct dnode *) xmalloc(sizeof(struct dnode));
 	cur->fullname = fullname;
 	cur->name = name;
 	cur->dstat = dstat;
+#ifdef CONFIG_SELINUX
+	cur->sid = sid;
+#endif
 	return cur;
 }
 
@@ -451,6 +487,9 @@ static void showfiles(struct dnode **dn, int nfiles)
 		/* find the longest file name-  use that as the column width */
 		for (i = 0; i < nfiles; i++) {
 			int len = strlen(dn[i]->name) +
+#ifdef CONFIG_SELINUX
+			((all_fmt & LIST_CONTEXT) ? 33 : 0) +
+#endif
 			((all_fmt & LIST_INO) ? 8 : 0) +
 			((all_fmt & LIST_BLOCKS) ? 5 : 0);
 			if (column_width < len)
@@ -695,6 +734,21 @@ static int list_single(struct dnode *dn)
 			column += 13;
 			break;
 #endif
+#ifdef CONFIG_SELINUX
+		case LIST_CONTEXT:
+			{
+				char context[64];
+				int len = sizeof(context);
+				if(security_sid_to_context(dn->sid, context, &len))
+				{
+					strcpy(context, "unknown");
+					len = 7;
+				}
+				printf("%-32s ", context);
+				column += MAX(33, len);
+			}
+			break;
+#endif
 		case LIST_FILENAME:
 #ifdef CONFIG_FEATURE_LS_COLOR
 			errno = 0;
@@ -774,6 +828,9 @@ static const char ls_opts[] = "1AaCdgilnsx"
 						 "h"
 #endif
 						 "k"
+#ifdef CONFIG_SELINUX
+						"K"
+#endif
 #ifdef CONFIG_FEATURE_AUTOWIDTH
 						 "T:w:"
 #endif
@@ -834,7 +891,12 @@ static const unsigned opt_flags[] = {
 #ifdef CONFIG_FEATURE_HUMAN_READABLE
 LS_DISP_HR,						/* h */
 #endif
+#ifndef CONFIG_SELINUX
 	0,							/* k - ingored */
+#else
+	LIST_CONTEXT,				/* k */
+	LIST_MODEBITS|LIST_NLINKS|LIST_CONTEXT|LIST_SIZE|LIST_DATE_TIME, /* K */
+#endif
 };
 
 
@@ -849,6 +911,9 @@ extern int ls_main(int argc, char **argv)
 	int opt;
 	int oi, ac;
 	char **av;
+#ifdef CONFIG_SELINUX
+	is_flask_enabled_flag = is_flask_enabled();
+#endif
 
 #ifdef CONFIG_FEATURE_AUTOWIDTH
 	struct winsize win = { 0, 0, 0, 0 };
@@ -911,6 +976,9 @@ extern int ls_main(int argc, char **argv)
 			if (flags & TIME_MASK_TRIGGER) {
 				all_fmt &= ~TIME_MASK;
 			}
+			if (flags & LIST_CONTEXT) {
+				all_fmt |= STYLE_SINGLE;
+			}
 #ifdef CONFIG_FEATURE_HUMAN_READABLE
 			if (opt == 'l') {
 				all_fmt &= ~LS_DISP_HR;
diff --git a/include/libbb.h b/include/libbb.h
index 7b3ac4b..edb8a6e 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -39,6 +39,9 @@
 #include <features.h>
 
 #include "config.h"
+#ifdef CONFIG_SELINUX
+#include <proc_secure.h>
+#endif
 
 #include "pwd_.h"
 #include "grp_.h"
@@ -394,7 +397,11 @@ void bb_xasprintf(char **string_ptr, const char *format, ...) __attribute__ ((fo
 
 #define FAIL_DELAY    3
 extern void change_identity ( const struct passwd *pw );
-extern void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args );
+extern void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args
+#ifdef CONFIG_SELINUX
+	, security_id_t sid
+#endif
+);
 extern int run_parts(char **args, const unsigned char test_mode);
 extern int restricted_shell ( const char *shell );
 extern void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw );
@@ -425,7 +432,11 @@ typedef struct {
 	char short_cmd[16];
 } procps_status_t;
 
-extern procps_status_t * procps_scan(int save_user_arg0);
+extern procps_status_t * procps_scan(int save_user_arg0
+#ifdef CONFIG_SELINUX
+	, int use_selinux, security_id_t *sid
+#endif
+);
 extern unsigned short compare_string_array(const char *string_array[], const char *key);
 
 extern int my_query_module(const char *name, int which, void **buf, size_t *bufsize, size_t *ret);
diff --git a/include/usage.h b/include/usage.h
index 701b40d..e0cfa7d 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -882,6 +882,12 @@
 	"\t-u\tthe hardware clock is kept in coordinated universal time\n" \
 	"\t-l\tthe hardware clock is kept in local time"
 
+#ifdef CONFIG_SELINUX
+#define USAGE_SELINUX(a, b) a
+#else
+#define USAGE_SELINUX(a, b) b
+#endif
+
 #define id_trivial_usage \
 	"[OPTIONS]... [USERNAME]"
 #define id_full_usage \
@@ -889,6 +895,7 @@
 	"Options:\n" \
 	"\t-g\tprints only the group ID\n" \
 	"\t-u\tprints only the user ID\n" \
+	USAGE_SELINUX("\t-c\tprints only the security context\n", "") \
 	"\t-n\tprint a name instead of a number (with for -ug)\n" \
 	"\t-r\tprints the real user ID instead of the effective ID (with -ug)"
 #define id_example_usage \
@@ -1347,7 +1354,7 @@
   #define USAGE_AUTOWIDTH(a)
 #endif
 #define ls_trivial_usage \
-	"[-1Aa" USAGE_LS_TIMESTAMPS("c") "Cd" USAGE_LS_TIMESTAMPS("e") USAGE_LS_FILETYPES("F") "iln" USAGE_LS_FILETYPES("p") USAGE_LS_FOLLOWLINKS("L") USAGE_LS_RECURSIVE("R") USAGE_LS_SORTFILES("rS") "s" USAGE_AUTOWIDTH("T") USAGE_LS_TIMESTAMPS("tu") USAGE_LS_SORTFILES("v") USAGE_AUTOWIDTH("w") "x" USAGE_LS_SORTFILES("X") USAGE_HUMAN_READABLE("h") USAGE_NOT_HUMAN_READABLE("") "k] [filenames...]"
+	"[-1Aa" USAGE_LS_TIMESTAMPS("c") "Cd" USAGE_LS_TIMESTAMPS("e") USAGE_LS_FILETYPES("F") "iln" USAGE_LS_FILETYPES("p") USAGE_LS_FOLLOWLINKS("L") USAGE_LS_RECURSIVE("R") USAGE_LS_SORTFILES("rS") "s" USAGE_AUTOWIDTH("T") USAGE_LS_TIMESTAMPS("tu") USAGE_LS_SORTFILES("v") USAGE_AUTOWIDTH("w") "x" USAGE_LS_SORTFILES("X") USAGE_HUMAN_READABLE("h") USAGE_NOT_HUMAN_READABLE("") "k" USAGE_SELINUX("K", "") "] [filenames...]"
 #define ls_full_usage \
 	"List directory contents\n\n" \
 	"Options:\n" \
@@ -1377,8 +1384,7 @@
 	USAGE_LS_SORTFILES("\t-X\tsort the listing by extension\n") \
 	USAGE_HUMAN_READABLE( \
 	"\t-h\tprint sizes in human readable format (e.g., 1K 243M 2G )\n" \
-	"\t-k\tprint sizes in kilobytes(default)") USAGE_NOT_HUMAN_READABLE( \
-	"\t-k\tprint sizes in kilobytes(compatibility)") 
+	USAGE_SELINUX("\t-k\tprint security context\n\t-K\tprint security context in long format\n", "")
 
 #define lsmod_trivial_usage \
 	""
@@ -1786,7 +1792,8 @@
 	""
 #define ps_full_usage \
 	"Report process status\n" \
-	"\nThis version of ps accepts no options."
+	USAGE_SELINUX("\nOptions:\n\t-c\tshow SE Linux context", "\nThis version of ps accepts no options.")
+ 
 #define ps_example_usage \
 	"$ ps\n" \
 	"  PID  Uid      Gid State Command\n" \
diff --git a/libbb/find_pid_by_name.c b/libbb/find_pid_by_name.c
index b6602b9..b8490b7 100644
--- a/libbb/find_pid_by_name.c
+++ b/libbb/find_pid_by_name.c
@@ -41,7 +41,11 @@ extern long* find_pid_by_name( const char* pidName)
 	procps_status_t * p;
 
 	pidList = xmalloc(sizeof(long));
+#ifdef CONFIG_SELINUX
+	while ((p = procps_scan(0, 0, NULL)) != 0) {
+#else
 	while ((p = procps_scan(0)) != 0) {
+#endif
 		if (strcmp(p->short_cmd, pidName) == 0) {
 			pidList=xrealloc( pidList, sizeof(long) * (i+2));
 			pidList[i++]=p->pid;
diff --git a/libbb/procps.c b/libbb/procps.c
index 7df0718..44103fa 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -16,7 +16,11 @@
 
 #include "libbb.h"
 
-extern procps_status_t * procps_scan(int save_user_arg0)
+extern procps_status_t * procps_scan(int save_user_arg0
+#ifdef CONFIG_SELINUX
+	, int use_selinux , security_id_t *sid
+#endif
+	)
 {
 	static DIR *dir;
 	struct dirent *entry;
@@ -53,6 +57,14 @@ extern procps_status_t * procps_scan(int save_user_arg0)
 		sprintf(status, "/proc/%d/stat", pid);
 		if((fp = fopen(status, "r")) == NULL)
 			continue;
+#ifdef CONFIG_SELINUX
+		if(use_selinux)
+		{
+			if(fstat_secure(fileno(fp), &sb, sid))
+				continue;
+		}
+		else
+#endif
 		if(fstat(fileno(fp), &sb))
 			continue;
 		my_getpwuid(curstatus.user, sb.st_uid);
diff --git a/libbb/run_shell.c b/libbb/run_shell.c
index 49e8a76..4855d76 100644
--- a/libbb/run_shell.c
+++ b/libbb/run_shell.c
@@ -36,14 +36,20 @@
 #include <syslog.h>
 #include <ctype.h>
 #include "libbb.h"
-
+#ifdef CONFIG_SELINUX
+#include <proc_secure.h>
+#endif
 
 /* Run SHELL, or DEFAULT_SHELL if SHELL is empty.
    If COMMAND is nonzero, pass it to the shell with the -c option.
    If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
    arguments.  */
 
-void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args )
+void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args
+#ifdef CONFIG_SELINUX
+	, security_id_t sid
+#endif
+)
 {
 	const char **args;
 	int argno = 1;
@@ -71,6 +77,11 @@ void run_shell ( const char *shell, int loginshell, const char *command, const c
 			args [argno++] = *additional_args;
 	}
 	args [argno] = 0;
+#ifdef CONFIG_SELINUX
+	if(sid)
+		execve_secure(shell, (char **) args, environ, sid);
+	else
+#endif
 	execv ( shell, (char **) args );
 	bb_perror_msg_and_die ( "cannot run %s", shell );
 }
diff --git a/loginutils/login.c b/loginutils/login.c
index e239f42..741d15c 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -16,7 +16,12 @@
 #include <time.h>
 
 #include "busybox.h"
-
+#ifdef CONFIG_SELINUX
+#include <flask_util.h>
+#include <get_sid_list.h>
+#include <proc_secure.h>
+#include <fs_secure.h>
+#endif
 
 #ifdef CONFIG_FEATURE_U_W_TMP
 // import from utmp.c
@@ -73,6 +78,10 @@ extern int login_main(int argc, char **argv)
 	int opt_fflag = 0;
 	char *opt_host = 0;
 	int alarmstarted = 0;	
+#ifdef CONFIG_SELINUX
+	int flask_enabled = is_flask_enabled();
+	security_id_t sid = 0, old_tty_sid, new_tty_sid;
+#endif
 
 	username[0]=0;
 	amroot = ( getuid ( ) == 0 );
@@ -217,6 +226,36 @@ auth_ok:
 #ifdef CONFIG_FEATURE_U_W_TMP
 	setutmp ( username, tty );
 #endif
+#ifdef CONFIG_SELINUX
+	if (flask_enabled)
+	{
+		struct stat st;
+
+		if (get_default_sid(username, 0, &sid))
+		{
+			fprintf(stderr, "Unable to get SID for %s\n", username);
+			exit(1);
+		}
+		if (stat_secure(tty, &st, &old_tty_sid))
+		{
+			fprintf(stderr, "stat_secure(%.100s) failed: %.100s\n", tty, strerror(errno));
+			return EXIT_FAILURE;
+		}
+		if (security_change_sid (sid, old_tty_sid, SECCLASS_CHR_FILE, &new_tty_sid) != 0)
+		{
+			fprintf(stderr, "security_change_sid(%.100s) failed: %.100s\n", tty, strerror(errno));
+			return EXIT_FAILURE;
+		}
+		if(chsid(tty, new_tty_sid) != 0)
+		{
+			fprintf(stderr, "chsid(%.100s, %d) failed: %.100s\n", tty, new_tty_sid, strerror(errno));
+			return EXIT_FAILURE;
+		}
+	}
+	else
+		sid = 0;
+#endif
+
 	if ( *tty != '/' ) 
 		snprintf ( full_tty, sizeof( full_tty ) - 1, "/dev/%s", tty);
 	else
@@ -239,7 +278,11 @@ auth_ok:
 	if ( pw-> pw_uid == 0 ) 
 		syslog ( LOG_INFO, "root login %s\n", fromhost );
 	
-	run_shell ( pw-> pw_shell, 1, 0, 0 );	/* exec the shell finally. */
+	run_shell ( pw-> pw_shell, 1, 0, 0
+#ifdef CONFIG_SELINUX
+	, sid
+#endif
+	 );	/* exec the shell finally. */
 	
 	return EXIT_FAILURE;
 }
diff --git a/loginutils/su.c b/loginutils/su.c
index 5e40cf2..85f5cbe 100644
--- a/loginutils/su.c
+++ b/loginutils/su.c
@@ -156,7 +156,11 @@ int su_main ( int argc, char **argv )
 
 	change_identity ( pw );	
 	setup_environment ( opt_shell, opt_loginshell, !opt_preserve, pw );
-	run_shell ( opt_shell, opt_loginshell, opt_command, (const char**)opt_args );
+	run_shell ( opt_shell, opt_loginshell, opt_command, (const char**)opt_args
+#ifdef CONFIG_SELINUX
+	, 0
+#endif
+	);
 	
 	return EXIT_FAILURE;
 }
diff --git a/procps/ps.c b/procps/ps.c
index 5ccac7a..691f490 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -31,6 +31,11 @@
 #include <termios.h>
 #include <sys/ioctl.h>
 #include "busybox.h"
+#ifdef CONFIG_SELINUX
+#include <fs_secure.h>
+#include <ss.h>
+#include <flask_util.h>          /* for is_flask_enabled() */
+#endif
 
 static const int TERMINAL_WIDTH = 79;      /* not 80 in case terminal has linefold bug */
 
@@ -47,6 +52,13 @@ extern int ps_main(int argc, char **argv)
 #define terminal_width  TERMINAL_WIDTH
 #endif
 
+#ifdef CONFIG_SELINUX
+	int use_selinux = 0;
+	security_id_t sid;
+	if(is_flask_enabled() && argv[1] && !strcmp(argv[1], "-c") )
+		use_selinux = 1;
+#endif
+
 
 #ifdef CONFIG_FEATURE_AUTOWIDTH
 		ioctl(fileno(stdout), TIOCGWINSZ, &win);
@@ -54,10 +66,31 @@ extern int ps_main(int argc, char **argv)
 			terminal_width = win.ws_col - 1;
 #endif
 
+#ifdef CONFIG_SELINUX
+	if(use_selinux)
+		printf("  PID Context                          Stat Command\n");
+	else
+#endif
 	printf("  PID  Uid     VmSize Stat Command\n");
+#ifdef CONFIG_SELINUX
+	while ((p = procps_scan(1, use_selinux, &sid)) != 0) {
+#else
 	while ((p = procps_scan(1)) != 0) {
+#endif
 		char *namecmd = p->cmd;
 
+#ifdef CONFIG_SELINUX
+		if(use_selinux)
+		{
+			char sbuf[128];
+			len = sizeof(sbuf);
+			if(security_sid_to_context(sid, (security_context_t)&sbuf, &len))
+				strcpy(sbuf, "unknown");
+
+			len = printf("%5d %-32s %s ", p->pid, sbuf, p->state);
+		}
+		else
+#endif
 		if(p->rss == 0)
 			len = printf("%5d %-8s        %s ", p->pid, p->user, p->state);
 		else
diff --git a/procps/top.c b/procps/top.c
index b70a42a..2e1bd32 100644
--- a/procps/top.c
+++ b/procps/top.c
@@ -501,7 +501,11 @@ int top_main(int argc, char **argv)
 		/* read process IDs & status for all the processes */
 		procps_status_t * p;
 
+#ifdef CONFIG_SELINUX
+		while ((p = procps_scan(0, 0, NULL) ) != 0) {
+#else
 		while ((p = procps_scan(0)) != 0) {
+#endif
 			int n = ntop;
 
 			top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
diff --git a/sysdeps/linux/Config.in b/sysdeps/linux/Config.in
index 70dd2ca..2e9ddc3 100644
--- a/sysdeps/linux/Config.in
+++ b/sysdeps/linux/Config.in
@@ -106,6 +106,13 @@ config CONFIG_FEATURE_SUID_CONFIG_QUIET
 	help
 	  Please submit a patch to add help text for this item.
 
+config CONFIG_SELINUX
+	bool "Support NSA Security Enhanced Linux"
+	default n
+	help
+	  Enable support for SE Linux in applets ls, ps, and id.  Also provide
+	  the option of compiling in SE Linux applets.
+
 endmenu
 
 menu 'Build Options'