1 /* 2 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * You should have received a copy of the GNU General Public License along 13 * with this program; if not, write the Free Software Foundation, Inc., 14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 15 * 16 */ 17 18 /* 19 * Description: This is a setuid to root program invoked by a non-root 20 * process to validate the mount flag MS_NOSUID. 21 * 22 * This function exit with 0 or 1 depending upon the 23 * success/failure of setuid(2) system call. 24 */ 25 26 #include <stdio.h> 27 #include <sys/types.h> 28 #include <unistd.h> 29 #include <stdlib.h> 30 #include <stdlib.h> 31 #include <errno.h> 32 33 /* Save the effective and real UIDs. */ 34 35 static uid_t ruid; 36 37 /* Restore the effective UID to its original value. */ 38 39 int do_setuid(void) 40 { 41 int status; 42 43 status = setreuid(ruid, 0); 44 if (status < 0) { 45 return 1; 46 } else { 47 return 0; 48 } 49 return 0; 50 } 51 52 /* Main program. */ 53 54 int main(void) 55 { 56 int exit_status; 57 58 /* Save the real and effective user IDs. */ 59 ruid = getuid(); 60 exit_status = do_setuid(); 61 62 exit(exit_status); 63 } 64
