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 300e4d8b6..83a53b84c 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 9b2d60dc7..971e7cdad 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 4a4956611..6245361e9 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 7b3ac4b85..edb8a6ed4 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 701b40daa..e0cfa7d2f 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 b6602b942..b8490b724 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 7df071869..44103fae8 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 49e8a76c2..4855d763e 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 e239f421c..741d15c93 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 5e40cf2e4..85f5cbe7b 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 5ccac7a95..691f490c7 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 b70a42a72..2e1bd3286 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 70dd2ca5e..2e9ddc382 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'