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: mremap02
22  *
23  * Test Description:
24  *  Verify that,
25  *   mremap() fails when used to expand the existing virtual memory mapped
26  *   region to the requested size, if the virtual memory area previously
27  *   mapped was not page aligned or invalid argument specified.
28  *
29  * Expected Result:
30  *  mremap() should return -1 and set errno to EINVAL.
31  *
32  * Algorithm:
33  *  Setup:
34  *   Setup signal handling.
35  *   Pause for SIGUSR1 if option specified.
36  *
37  *  Test:
38  *   Loop if the proper options are given.
39  *   Execute system call
40  *   Check return code, if system call failed (return=-1)
41  *	if errno set == expected errno
42  *		Issue sys call fails with expected return value and errno.
43  *	Otherwise,
44  *		Issue sys call fails with unexpected errno.
45  *   Otherwise,
46  *	Issue sys call returns unexpected value.
47  *
48  *  Cleanup:
49  *   Print errno log and/or timing stats if options given
50  *
51  * Usage:  <for command-line>
52  *  mremap02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
53  *     where,  -c n : Run n copies concurrently.
54  *	       -e   : Turn on errno logging.
55  *	       -i n : Execute test n times.
56  *	       -I x : Execute test for x seconds.
57  *	       -p x : Pause for x seconds between iterations.
58  *	       -t   : Turn on syscall timing.
59  *
60  * HISTORY
61  *	07/2001 Ported by Wayne Boyer
62  *
63  *      11/09/2001 Manoj Iyer (manjo@austin.ibm.com)
64  *      Modified.
65  *      - #include <linux/mman.h> should not be included as per man page for
66  *        mremap, #include <sys/mman.h> alone should do the job. But inorder
67  *        to include definition of MREMAP_MAYMOVE defined in bits/mman.h
68  *        (included by sys/mman.h) __USE_GNU needs to be defined.
69  *        There may be a more elegant way of doing this...
70  *
71  *
72  * RESTRICTIONS:
73  *  None.
74  */
75 #include <errno.h>
76 #include <unistd.h>
77 #include <fcntl.h>
78 #define __USE_GNU
79 #include <sys/mman.h>
80 #undef __USE_GNU
81 
82 #include "test.h"
83 
84 char *TCID = "mremap02";
85 int TST_TOTAL = 1;
86 char *addr;			/* addr of memory mapped region */
87 int memsize;			/* memory mapped size */
88 int newsize;			/* new size of virtual memory block */
89 
90 void setup();			/* Main setup function of test */
91 void cleanup();			/* cleanup function for the test */
92 
93 int main(int ac, char **av)
94 {
95 	int lc;
96 
97 	tst_parse_opts(ac, av, NULL, NULL);
98 
99 	setup();
100 
101 	for (lc = 0; TEST_LOOPING(lc); lc++) {
102 
103 		tst_count = 0;
104 
105 		/*
106 		 * Attempt to expand the existing mapped
107 		 * memory region (memsize) by newsize limits using
108 		 * mremap() should fail as old virtual address is not
109 		 * page aligned.
110 		 */
111 		errno = 0;
112 		addr = mremap(addr, memsize, newsize, MREMAP_MAYMOVE);
113 		TEST_ERRNO = errno;
114 
115 		/* Check for the return value of mremap() */
116 		if (addr != MAP_FAILED) {
117 			tst_resm(TFAIL,
118 				 "mremap returned invalid value, expected: -1");
119 
120 			/* Unmap the mapped memory region */
121 			if (munmap(addr, newsize) != 0) {
122 				tst_brkm(TBROK, cleanup, "munmap fails to "
123 					 "unmap the expanded memory region, "
124 					 "error=%d", errno);
125 			}
126 			continue;
127 		}
128 
129 		if (errno == EINVAL) {
130 			tst_resm(TPASS, "mremap() Failed, 'invalid argument "
131 				 "specified' - errno %d", TEST_ERRNO);
132 		} else {
133 			tst_resm(TFAIL, "mremap() Failed, "
134 				 "'Unexpected errno %d", TEST_ERRNO);
135 		}
136 	}
137 
138 	cleanup();
139 	tst_exit();
140 
141 }
142 
143 /*
144  * setup() - performs all ONE TIME setup for this test.
145  *
146  * Get system page size, Set the size of virtual memory area and the
147  * new size after resize, Set the virtual memory address such that it
148  * is not aligned.
149  */
150 void setup(void)
151 {
152 
153 	tst_sig(FORK, DEF_HANDLER, cleanup);
154 
155 	TEST_PAUSE;
156 
157 	/* Get the system page size */
158 	if ((memsize = getpagesize()) < 0) {
159 		tst_brkm(TFAIL, NULL,
160 			 "getpagesize() fails to get system page size");
161 	}
162 
163 	/* Get the New size of virtual memory block after resize */
164 	newsize = (memsize * 2);
165 
166 	/* Set the old virtual memory address */
167 	addr = (char *)(addr + (memsize - 1));
168 }
169 
170 /*
171  * cleanup() - performs all ONE TIME cleanup for this test at
172  *             completion or premature exit.
173  */
174 void cleanup(void)
175 {
176 
177 	/* Exit the program */
178 
179 }
180