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      1 /*
      2  *  This program is free software; you can redistribute it and/or modify
      3  *  it under the terms of the GNU General Public License version 2.
      4  *
      5  *  This program is distributed in the hope that it will be useful,
      6  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      7  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      8  *  GNU General Public License for more details.
      9  *
     10  *
     11  * Test that sched_getparam() sets errno == EPERM if the requesting process
     12  * does not have permission.
     13  */
     14 
     15  /* adam.li (at) intel.com - 2004-05-21
     16   *
     17   * On Linux, e.g, the kernel makes no check on user permission to call this
     18   * API. So basically we don't know on what condition a system should return
     19   * EPERM. It is implementation defined.
     20   */
     21 
     22 #include <sys/types.h>
     23 #include <errno.h>
     24 #include <pwd.h>
     25 #include <sched.h>
     26 #include <stdio.h>
     27 #include <string.h>
     28 #include <unistd.h>
     29 #include "posixtest.h"
     30 
     31 /** Set the euid of this process to a non-root uid */
     32 int set_nonroot()
     33 {
     34 	struct passwd *pw;
     35 	setpwent();
     36 	/* search for the first user which is non root */
     37 	while ((pw = getpwent()) != NULL)
     38 		if (pw->pw_uid != 0)
     39 			break;
     40 	endpwent();
     41 	if (pw == NULL) {
     42 		printf("There is no other user than current and root.\n");
     43 		return 1;
     44 	}
     45 
     46 	if (setgid(pw->pw_gid) != 0) {
     47 		if (errno == EPERM)
     48 			printf("You don't have permission to change "
     49 			       "your GID.\n");
     50 		else
     51 			perror("setgid failed");
     52 		return 1;
     53 	}
     54 
     55 	if (setuid(pw->pw_uid) != 0) {
     56 		if (errno == EPERM)
     57 			printf("You don't have permission to change "
     58 			       "your UID.\n");
     59 		else
     60 			perror("setuid failed");
     61 
     62 		return 1;
     63 	}
     64 
     65 	printf("Testing with user '%s' (euid,uid) = (%d,%d)\n",
     66 	       pw->pw_name, geteuid(), getuid());
     67 	return 0;
     68 }
     69 
     70 int main(void)
     71 {
     72 
     73 	struct sched_param param;
     74 	int result = -1;
     75 
     76 	/*
     77 	 * We assume process Number 1 is created by root
     78 	 * and can only be accessed by root
     79 	 * This test should be run under standard user permissions
     80 	 */
     81 	if (geteuid() == 0) {
     82 		if (set_nonroot() != 0) {
     83 			printf("Cannot run this test as non-root user\n");
     84 			return PTS_UNTESTED;
     85 		}
     86 	}
     87 
     88 	result = sched_getparam(1, &param);
     89 
     90 	if (result == -1 && errno == EPERM) {
     91 		printf("Test PASS\n");
     92 		return PTS_PASS;
     93 	}
     94 	if (result == 0) {
     95 		printf("The function sched_getparam has successed.\n");
     96 		return PTS_UNTESTED;
     97 	}
     98 	if (errno != EPERM) {
     99 		perror("errno is not EPERM: The system allows a non-root"
    100 		       "user to use sched_getparam()");
    101 		return PTS_UNRESOLVED;
    102 	} else {
    103 		perror("Unresolved test error");
    104 		return PTS_UNRESOLVED;
    105 	}
    106 }
    107