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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  * NAME
     22  * 	chdir04.c
     23  *
     24  * DESCRIPTION
     25  *	Testcase to test whether chdir(2) sets errno correctly.
     26  *
     27  * ALGORITHM
     28  *	1.	Test for ENAMETOOLONG:
     29  *		Create a bad directory name with length more than
     30  *
     31  *		VFS_MAXNAMELEN (Linux kernel variable), and attempt to
     32  *		chdir(2) to it.
     33  *
     34  *	2.	Test for ENOENT:
     35  *		Attempt to chdir(2) on a non-existent directory
     36  *
     37  *	3.	Test for EFAULT:
     38  *		Pass an address which lies outside the address space of the
     39  *		process, and expect an EFAULT.
     40  *
     41  * USAGE:  <for command-line>
     42  * chdir04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
     43  *     where,  -c n : Run n copies concurrently.
     44  *             -e   : Turn on errno logging.
     45  *             -i n : Execute test n times.
     46  *             -I x : Execute test for x seconds.
     47  *             -P x : Pause for x seconds between iterations.
     48  *             -t   : Turn on syscall timing.
     49  *
     50  * HISTORY
     51  *	07/2001 Ported by Wayne Boyer
     52  *
     53  * RESTRICTIONS
     54  *	NONE
     55  */
     56 
     57 #include <stdio.h>
     58 #include <errno.h>
     59 #include <sys/stat.h>
     60 #include <sys/mman.h>
     61 #include "test.h"
     62 
     63 char *TCID = "chdir04";
     64 
     65 char bad_dir[] =
     66     "abcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyz";
     67 
     68 char noexist_dir[] = "/tmp/noexistdir";
     69 
     70 struct test_case_t {
     71 	char *dname;
     72 	int error;
     73 } TC[] = {
     74 	/*
     75 	 * to test whether chdir() is setting ENAMETOOLONG if the
     76 	 * directory is more than VFS_MAXNAMELEN
     77 	 */
     78 	{
     79 	bad_dir, ENAMETOOLONG},
     80 	    /*
     81 	     * to test whether chdir() is setting ENOENT if the
     82 	     * directory is not existing.
     83 	     */
     84 	{
     85 	noexist_dir, ENOENT},
     86 #ifndef UCLINUX
     87 	    /*
     88 	     * to test whether chdir() is setting EFAULT if the
     89 	     * directory is an invalid address.
     90 	     */
     91 	{
     92 	(void *)-1, EFAULT}
     93 #endif
     94 };
     95 
     96 int TST_TOTAL = ARRAY_SIZE(TC);
     97 
     98 int flag;
     99 #define	FAILED	1
    100 
    101 void setup(void);
    102 void cleanup(void);
    103 
    104 char *bad_addr = 0;
    105 
    106 int main(int ac, char **av)
    107 {
    108 	int lc;
    109 	int i;
    110 
    111 	tst_parse_opts(ac, av, NULL, NULL);
    112 
    113 	setup();
    114 
    115 	for (lc = 0; TEST_LOOPING(lc); lc++) {
    116 		tst_count = 0;
    117 
    118 		for (i = 0; i < TST_TOTAL; i++) {
    119 
    120 			TEST(chdir(TC[i].dname));
    121 
    122 			if (TEST_RETURN != -1) {
    123 				tst_resm(TFAIL, "call succeeded unexpectedly");
    124 				continue;
    125 			}
    126 
    127 			if (TEST_ERRNO == TC[i].error)
    128 				tst_resm(TPASS | TTERRNO, "failed as expected");
    129 			else {
    130 				tst_resm(TFAIL | TTERRNO,
    131 					 "didn't fail as expected (expected %d)",
    132 					 TC[i].error);
    133 			}
    134 		}
    135 	}
    136 	cleanup();
    137 
    138 	tst_exit();
    139 
    140 }
    141 
    142 void setup(void)
    143 {
    144 
    145 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    146 
    147 	TEST_PAUSE;
    148 
    149 	tst_tmpdir();
    150 
    151 #ifdef UCLINUX
    152 	bad_addr = mmap(0, 1, PROT_NONE,
    153 			MAP_PRIVATE_EXCEPT_UCLINUX | MAP_ANONYMOUS, 0, 0);
    154 	if (bad_addr == MAP_FAILED)
    155 		tst_brkm(TBROK | TERRNO, cleanup, "mmap() failed");
    156 	TC[2].dname = bad_addr;
    157 #endif
    158 }
    159 
    160 void cleanup(void)
    161 {
    162 	tst_rmdir();
    163 
    164 }
    165