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      1 /*
      2  *
      3  *   Copyright (c) International Business Machines  Corp., 2001
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program is distributed in the hope that it will be useful,
     11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  */
     19 
     20 /*
     21  * Test Name: fchmod03
     22  *
     23  * Test Description:
     24  *  Verify that, fchmod(2) will succeed to change the mode of a file
     25  *  and set the sticky bit on it if invoked by non-root (uid != 0)
     26  *  process with the following constraints,
     27  *	- the process is the owner of the file.
     28  *	- the effective group ID or one of the supplementary group ID's of the
     29  *	  process is equal to the group ID of the file.
     30  *
     31  * Expected Result:
     32  *  fchmod() should return value 0 on success and succeeds to change
     33  *  the mode of specified file, sets sticky bit on it.
     34  *
     35  * Algorithm:
     36  *  Setup:
     37  *   Setup signal handling.
     38  *   Create temporary directory.
     39  *   Pause for SIGUSR1 if option specified.
     40  *
     41  *  Test:
     42  *   Loop if the proper options are given.
     43  *   Execute system call
     44  *   Check return code, if system call failed (return=-1)
     45  *   	Log the errno and Issue a FAIL message.
     46  *   Otherwise,
     47  *   	Verify the Functionality of system call
     48  *      if successful,
     49  *      	Issue Functionality-Pass message.
     50  *      Otherwise,
     51  *		Issue Functionality-Fail message.
     52  *  Cleanup:
     53  *   Print errno log and/or timing stats if options given
     54  *   Delete the temporary directory created.
     55  *
     56  * Usage:  <for command-line>
     57  *  fchmod03 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
     58  *     where,  -c n : Run n copies concurrently.
     59  *             -f   : Turn off functionality Testing.
     60  *	       -i n : Execute test n times.
     61  *	       -I x : Execute test for x seconds.
     62  *	       -P x : Pause for x seconds between iterations.
     63  *	       -t   : Turn on syscall timing.
     64  *
     65  * HISTORY
     66  *	07/2001 Ported by Wayne Boyer
     67  *
     68  * RESTRICTIONS:
     69  *  This test should be run by 'non-super-user' only.
     70  *
     71  */
     72 
     73 #include <stdio.h>
     74 #include <sys/types.h>
     75 #include <sys/stat.h>
     76 #include <fcntl.h>
     77 #include <errno.h>
     78 #include <string.h>
     79 #include <signal.h>
     80 #include <pwd.h>
     81 
     82 #include "test.h"
     83 #include "safe_macros.h"
     84 
     85 #define FILE_MODE       (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
     86 #define PERMS		01777
     87 #define TESTFILE	"testfile"
     88 
     89 int fd;				/* file descriptor for test file */
     90 char *TCID = "fchmod03";
     91 int TST_TOTAL = 1;
     92 
     93 char nobody_uid[] = "nobody";
     94 struct passwd *ltpuser;
     95 
     96 void setup();			/* Main setup function for the test */
     97 void cleanup();			/* Main cleanup function for the test */
     98 
     99 int main(int ac, char **av)
    100 {
    101 	struct stat stat_buf;	/* stat struct. */
    102 	int lc;
    103 	mode_t file_mode;	/* mode permissions set on testfile */
    104 
    105 	tst_parse_opts(ac, av, NULL, NULL);
    106 
    107 	setup();
    108 
    109 	for (lc = 0; TEST_LOOPING(lc); lc++) {
    110 
    111 		tst_count = 0;
    112 
    113 		TEST(fchmod(fd, PERMS));
    114 
    115 		if (TEST_RETURN == -1) {
    116 			tst_resm(TFAIL | TTERRNO, "fchmod failed");
    117 			continue;
    118 		}
    119 		/*
    120 		 * Get the file information using
    121 		 * fstat(2).
    122 		 */
    123 		if (fstat(fd, &stat_buf) == -1)
    124 			tst_brkm(TFAIL | TERRNO, cleanup,
    125 				 "fstat failed");
    126 		file_mode = stat_buf.st_mode;
    127 
    128 		/* Verify STICKY BIT set on testfile */
    129 		if ((file_mode & PERMS) != PERMS)
    130 			tst_resm(TFAIL, "%s: Incorrect modes 0%3o, "
    131 				 "Expected 0777", TESTFILE, file_mode);
    132 		else
    133 			tst_resm(TPASS, "Functionality of fchmod(%d, "
    134 				 "%#o) successful", fd, PERMS);
    135 	}
    136 
    137 	cleanup();
    138 	tst_exit();
    139 }
    140 
    141 void setup(void)
    142 {
    143 
    144 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    145 
    146 	tst_require_root();
    147 
    148 	ltpuser = getpwnam(nobody_uid);
    149 	if (ltpuser == NULL)
    150 		tst_brkm(TBROK | TERRNO, NULL, "getpwnam failed");
    151 	SAFE_SETEUID(NULL, ltpuser->pw_uid);
    152 
    153 	TEST_PAUSE;
    154 
    155 	tst_tmpdir();
    156 
    157 	/*
    158 	 * Create a test file under temporary directory with specified
    159 	 * mode permissios and set the ownership of the test file to the
    160 	 * uid/gid of guest user.
    161 	 */
    162 	if ((fd = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE)) == -1)
    163 		tst_brkm(TBROK | TERRNO, cleanup, "open failed");
    164 }
    165 
    166 void cleanup(void)
    167 {
    168 	if (close(fd) == -1)
    169 		tst_resm(TWARN | TERRNO, "close failed");
    170 
    171 	tst_rmdir();
    172 
    173 }
    174