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: mremap03
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 there already exists mappings that
27  *   cover the whole address space requsted or the old address specified was
28  *   not mapped.
29  *
30  * Expected Result:
31  *  mremap() should return -1 and set errno to EFAULT.
32  *
33  * Algorithm:
34  *  Setup:
35  *   Setup signal handling.
36  *   Pause for SIGUSR1 if option specified.
37  *
38  *  Test:
39  *   Loop if the proper options are given.
40  *   Execute system call
41  *   Check return code, if system call failed (return=-1)
42  *	if errno set == expected errno
43  *		Issue sys call fails with expected return value and errno.
44  *	Otherwise,
45  *		Issue sys call fails with unexpected errno.
46  *   Otherwise,
47  *	Issue sys call returns unexpected value.
48  *
49  *  Cleanup:
50  *   Print errno log and/or timing stats if options given
51  *
52  * Usage:  <for command-line>
53  *  mremap03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
54  *     where,  -c n : Run n copies concurrently.
55  *             -e   : Turn on errno logging.
56  *	       -i n : Execute test n times.
57  *	       -I x : Execute test for x seconds.
58  *	       -p x : Pause for x seconds between iterations.
59  *	       -t   : Turn on syscall timing.
60  *
61  * HISTORY
62  *	07/2001 Ported by Wayne Boyer
63  *
64  *      11/09/2001 Manoj Iyer (manjo@austin.ibm.com)
65  *      Modified.
66  *      - #include <linux/mman.h> should not be included as per man page for
67  *        mremap, #include <sys/mman.h> alone should do the job. But inorder
68  *        to include definition of MREMAP_MAYMOVE defined in bits/mman.h
69  *        (included by sys/mman.h) __USE_GNU needs to be defined.
70  *        There may be a more elegant way of doing this...
71  *
72  *
73  * RESTRICTIONS:
74  *  None.
75  */
76 #include <errno.h>
77 #include <unistd.h>
78 #include <fcntl.h>
79 #define __USE_GNU
80 #include <sys/mman.h>
81 #undef __USE_GNU
82 
83 #include "test.h"
84 
85 char *TCID = "mremap03";
86 int TST_TOTAL = 1;
87 char *addr;			/* addr of memory mapped region */
88 int memsize;			/* memory mapped size */
89 int newsize;			/* new size of virtual memory block */
90 
91 void setup();			/* Main setup function of test */
92 void cleanup();			/* cleanup function for the test */
93 
94 #if !defined(UCLINUX)
95 int main(int ac, char **av)
96 {
97 	int lc;
98 
99 	tst_parse_opts(ac, av, NULL, NULL);
100 
101 	setup();
102 
103 	for (lc = 0; TEST_LOOPING(lc); lc++) {
104 
105 		tst_count = 0;
106 
107 		/*
108 		 * Attempt to expand the existing mapped
109 		 * memory region (memsize) by newsize limits
110 		 * using mremap() should fail as specifed old
111 		 * virtual address was not mapped.
112 		 */
113 		errno = 0;
114 		addr = mremap(addr, memsize, newsize, MREMAP_MAYMOVE);
115 		TEST_ERRNO = errno;
116 
117 		/* Check for the return value of mremap() */
118 		if (addr != MAP_FAILED) {
119 			tst_resm(TFAIL,
120 				 "mremap returned invalid value, expected: -1");
121 
122 			/* Unmap the mapped memory region */
123 			if (munmap(addr, newsize) != 0) {
124 				tst_brkm(TFAIL, cleanup, "munmap fails to "
125 					 "unmap the expanded memory region, "
126 					 " error=%d", errno);
127 			}
128 			continue;
129 		}
130 
131 		/* Check for the expected errno */
132 		if (errno == EFAULT) {
133 			tst_resm(TPASS, "mremap() Fails, 'old region not "
134 				 "mapped', errno %d", TEST_ERRNO);
135 		} else {
136 			tst_resm(TFAIL, "mremap() Fails, "
137 				 "'Unexpected errno %d", TEST_ERRNO);
138 		}
139 	}
140 
141 	cleanup();
142 	tst_exit();
143 
144 }
145 
146 /*
147  * setup() - performs all ONE TIME setup for this test.
148  *
149  * Get system page size.
150  * Set the old address point some high address which is not mapped.
151  */
152 void setup(void)
153 {
154 	int page_sz;		/* system page size */
155 
156 	tst_sig(FORK, DEF_HANDLER, cleanup);
157 
158 	TEST_PAUSE;
159 
160 	/* Get the system page size */
161 	if ((page_sz = getpagesize()) < 0) {
162 		tst_brkm(TFAIL, NULL,
163 			 "getpagesize() fails to get system page size");
164 	}
165 
166 	/* Get the size of virtual memory area to be mapped */
167 	memsize = (1000 * page_sz);
168 
169 	/* Get the New size of virtual memory block after resize */
170 	newsize = (memsize * 2);
171 
172 	/*
173 	 * Set the old virtual address point to some address
174 	 * which is not mapped.
175 	 */
176 	addr = (char *)get_high_address();
177 }
178 
179 /*
180  * cleanup() - performs all ONE TIME cleanup for this test at
181  *             completion or premature exit.
182  */
183 void cleanup(void)
184 {
185 
186 	/* Exit the program */
187 
188 }
189 
190 #else
191 
192 int main(void)
193 {
194 	tst_resm(TINFO, "test is not available on uClinux");
195 	tst_exit();
196 }
197 
198 #endif /* if !defined(UCLINUX) */
199