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      1 /*
      2  * Copyright (c) 2014 Fujitsu Ltd.
      3  * Author: Zeng Linggang <zenglg.jy (at) cn.fujitsu.com>
      4  *
      5  * This program is free software; you can redistribute it and/or modify it
      6  * under the terms of version 2 of the GNU General Public License as
      7  * published by the Free Software Foundation.
      8  *
      9  * This program is distributed in the hope that it would be useful, but
     10  * WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     12  *
     13  * You should have received a copy of the GNU General Public License along
     14  * with this program; if not, write the Free Software Foundation, Inc.,
     15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     16  */
     17 /*
     18  * Test Description:
     19  *  Verify that,
     20  *	File system UID is always set to the same value as the (possibly new)
     21  *	effective UID.
     22  */
     23 
     24 #define _GNU_SOURCE
     25 
     26 #include <errno.h>
     27 #include <unistd.h>
     28 #include <pwd.h>
     29 #include <sys/stat.h>
     30 #include "test.h"
     31 #include "safe_macros.h"
     32 #include "compat_16.h"
     33 
     34 TCID_DEFINE(setresuid05);
     35 int TST_TOTAL = 1;
     36 static struct passwd *ltpuser;
     37 static void setup(void);
     38 static void setresuid_verify(void);
     39 static void cleanup(void);
     40 
     41 int main(int argc, char **argv)
     42 {
     43 	int i, lc;
     44 
     45 	tst_parse_opts(argc, argv, NULL, NULL);
     46 
     47 	setup();
     48 
     49 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     50 		tst_count = 0;
     51 		for (i = 0; i < TST_TOTAL; i++)
     52 			setresuid_verify();
     53 	}
     54 
     55 	cleanup();
     56 	tst_exit();
     57 }
     58 
     59 static void setup(void)
     60 {
     61 	tst_require_root();
     62 
     63 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
     64 
     65 	TEST_PAUSE;
     66 
     67 	tst_tmpdir();
     68 
     69 	ltpuser = SAFE_GETPWNAM(cleanup, "nobody");
     70 
     71 	UID16_CHECK(ltpuser->pw_uid, "setresuid", cleanup)
     72 }
     73 
     74 static void setresuid_verify(void)
     75 {
     76 	struct stat buf;
     77 
     78 	TEST(SETRESUID(cleanup, -1, ltpuser->pw_uid, -1));
     79 
     80 	if (TEST_RETURN != 0) {
     81 		tst_resm(TFAIL | TTERRNO, "setresuid failed unexpectedly");
     82 		return;
     83 	}
     84 
     85 	SAFE_TOUCH(cleanup, "test_file", 0644, NULL);
     86 
     87 	SAFE_STAT(cleanup, "test_file", &buf);
     88 
     89 	if (ltpuser->pw_uid == buf.st_uid) {
     90 		tst_resm(TPASS, "setresuid succeeded as expected");
     91 	} else {
     92 		tst_resm(TFAIL,
     93 			 "setresuid failed unexpectedly; euid(%d) - st_uid(%d)",
     94 			 ltpuser->pw_uid, buf.st_uid);
     95 	}
     96 }
     97 
     98 static void cleanup(void)
     99 {
    100 	if (seteuid(0) < 0)
    101 		tst_resm(TWARN | TERRNO, "seteuid failed");
    102 
    103 	tst_rmdir();
    104 }
    105