1 /*
2  *
3  *   Copyright (C) Bull S.A. 2001
4  *   Copyright (c) International Business Machines  Corp., 2001
5  *
6  *   This program is free software;  you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
14  *   the GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program;  if not, write to the Free Software
18  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /*
22  * Test Name: fstat05
23  *
24  * Test Description:
25  *   Verify that,
26  *   if buffer points outside user's accessible address space fstat(2)
27  *	either returns -1 and sets errno to EFAULT
28  *	or SIGSEGV is returned instead of EFAULT
29  *
30  * Expected Result:
31  *   fstat() should fail with return value -1 and set expected errno.
32  *    or
33  *   fstat() should fail with SIGSEGV returned.
34  *   Both results are considered as acceptable.
35  *
36  * Algorithm:
37  *  Setup:
38  *   Setup signal handling SIGSEGV included.
39  *   Switch to nobody user.
40  *   Pause for SIGUSR1 if option specified.
41  *   Create temporary directory.
42  *   Create a testfile under temporary directory.
43  *
44  *  Test:
45  *   Buffer points outside user's accessible address space.
46  *   Loop if the proper options are given.
47  *   Execute system call
48  *   Check return code, if system call failed (return=-1)
49  *	if errno set == expected errno
50  *		Issue sys call fails with expected return value and errno.
51  *	Otherwise,
52  *		Issue sys call fails with unexpected errno.
53  *   Otherwise,
54  *	Issue sys call returns unexpected value.
55  *
56  *  Sighandler:
57  *	if signal == SIGSEGV
58  *		Issue sys call fails with expected signal
59  *      Otherwise,
60  *              Issue sys call fails with unexpected signal.
61  *
62  *  Cleanup:
63  *   Print errno log and/or timing stats if options given
64  *   Close the test file
65  *   Delete the temporary directory(s)/file(s) created.
66  *
67  * Usage:  <for command-line>
68  *  fstat05 [-c n] [-e] [-i n] [-I x] [-p x] [-t]
69  *	where,  -c n : Run n copies concurrently.
70  *		-e   : Turn on errno logging.
71  *		-i n : Execute test n times.
72  *		-I x : Execute test for x seconds.
73  *		-P x : Pause for x seconds between iterations.
74  *		-t   : Turn on syscall timing.
75  *
76  * History
77  *	05/2002 Jacky Malcles
78  *		-Ported
79  *
80  * Restrictions:
81  *      This test must be run as root.
82  */
83 
84 #include <stdio.h>
85 #include <stdlib.h>
86 #include <unistd.h>
87 #include <fcntl.h>
88 #include <errno.h>
89 #include <string.h>
90 #include <signal.h>
91 #include <sys/types.h>
92 #include <sys/stat.h>
93 #include <pwd.h>
94 
95 #include "test.h"
96 #include "safe_macros.h"
97 
98 #define TEST_FILE       "testfile"
99 
100 char nobody_uid[] = "nobody";
101 struct passwd *ltpuser;
102 
103 char *TCID = "fstat05";
104 int TST_TOTAL = 1;
105 
106 int fildes;			/* testfile descriptor */
107 
108 void setup();			/* Main setup function for the tests */
109 void cleanup();			/* cleanup function for the test */
110 void sighandler(int sig);	/* signals handler function for the test */
111 
112 int siglist[] = { SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT, SIGIOT,
113 	SIGBUS, SIGFPE, SIGUSR1, SIGSEGV, SIGUSR2, SIGPIPE, SIGALRM,
114 	SIGTERM,
115 #ifdef SIGSTKFLT
116 	SIGSTKFLT,
117 #endif
118 	SIGCHLD, SIGCONT, SIGTSTP, SIGTTIN,
119 	SIGTTOU, SIGURG, SIGXCPU, SIGXFSZ, SIGVTALRM, SIGPROF,
120 	SIGWINCH, SIGIO, SIGPWR, SIGSYS,
121 #ifdef SIGUNUSED
122 	SIGUNUSED
123 #endif
124 };
125 
126 int SIG_SEEN = sizeof(siglist) / sizeof(int);
127 
128 #if !defined(UCLINUX)
129 
130 int main(int ac, char **av)
131 {
132 	struct stat stat_buf;	/* stat structure buffer */
133 	struct stat *ptr_str;
134 	int lc;
135 
136 	tst_parse_opts(ac, av, NULL, NULL);
137 
138 	/* Buffer points outside user's accessible address space. */
139 	ptr_str = &stat_buf;	/* if it was for conformance testing */
140 	ptr_str = (void *)sbrk(0) + (4 * getpagesize());
141 
142 	/*
143 	 * Invoke setup function
144 	 */
145 	setup();
146 
147 	for (lc = 0; TEST_LOOPING(lc); lc++) {
148 
149 		tst_count = 0;
150 
151 		/*
152 		 * Call fstat(2).
153 		 * verify that it fails with -1 return value and
154 		 * sets appropriate errno.
155 		 */
156 		TEST(fstat(fildes, ptr_str));
157 
158 		/* Check return code from fstat(2) */
159 		if (TEST_RETURN == -1) {
160 			if (TEST_ERRNO == EFAULT)
161 				tst_resm(TPASS,
162 					 "fstat failed with EFAULT as expected");
163 			else
164 				tst_resm(TFAIL | TTERRNO,
165 					 "fstat failed unexpectedly");
166 		} else
167 			tst_resm(TFAIL, "fstat() returned %ld but we wanted -1",
168 				 TEST_RETURN);
169 
170 	}
171 
172 	/*
173 	 * Invoke cleanup() to delete the test directory/file(s) created
174 	 * in the setup().
175 	 */
176 	cleanup();
177 	tst_exit();
178 }
179 
180 #else
181 
182 int main(void)
183 {
184 	tst_brkm(TCONF, NULL, "test is not available on uClinux");
185 }
186 
187 #endif /* if !defined(UCLINUX) */
188 
189 /*
190  * void
191  * setup(void) - performs all ONE TIME setup for this test.
192  *	Exit the test program on receipt of unexpected signals.
193  *	Create a temporary directory and change directory to it.
194  */
195 void setup(void)
196 {
197 	int i;
198 
199 	tst_require_root();
200 
201 	/*
202 	 * Capture unexpected signals SIGSEGV included
203 	 * SIGSEGV being considered as acceptable as returned value
204 	 */
205 	for (i = 0; i < SIG_SEEN; i++)
206 		signal(siglist[i], &sighandler);
207 
208 	ltpuser = getpwnam(nobody_uid);
209 	SAFE_SETUID(NULL, ltpuser->pw_uid);
210 
211 	tst_tmpdir();
212 
213 	/* Create a testfile under temporary directory */
214 	fildes = SAFE_OPEN(cleanup, TEST_FILE, O_RDWR | O_CREAT, 0666);
215 
216 	TEST_PAUSE;
217 }
218 
219 /*
220  * void
221  * cleanup() - Performs all ONE TIME cleanup for this test at
222  *             completion or premature exit.
223  *	Print test timing stats and errno log if test executed with options.
224  *	Remove temporary directory and sub-directories/files under it
225  *	created during setup().
226  *	Exit the test program with normal exit code.
227  */
228 void cleanup(void)
229 {
230 
231 	SAFE_CLOSE(cleanup, fildes);
232 
233 	tst_rmdir();
234 
235 }
236 
237 /*
238  * sighandler() - handle the signals
239  */
240 
241 void sighandler(int sig)
242 {
243 	if (sig == SIGSEGV)
244 		tst_resm(TPASS, "fstat failed as expected with SIGSEGV");
245 	else
246 		tst_brkm(TBROK, NULL, "Unexpected signal %d received.", sig);
247 	cleanup();
248 	tst_exit();
249 }
250