301 lines
8.3 KiB
C
301 lines
8.3 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Test Name: mmap05
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*
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* Test Description:
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* Call mmap() to map a file creating mapped memory with no access under
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* the following conditions -
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* - The prot parameter is set to PROT_NONE
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* - The file descriptor is open for read(any mode other than write)
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* - The minimum file permissions should be 0444.
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*
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* The call should succeed to map the file creating mapped memory with the
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* required attributes.
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*
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* Expected Result:
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* mmap() should succeed returning the address of the mapped region,
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* and an attempt to access the contents of the mapped region should give
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* rise to the signal SIGSEGV.
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*
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* Algorithm:
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* Setup:
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* Setup signal handling.
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* Pause for SIGUSR1 if option specified.
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* Create temporary directory.
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*
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* Test:
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* Loop if the proper options are given.
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* Execute system call
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* Check return code, if system call failed (return=-1)
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* Log the errno and Issue a FAIL message.
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* Otherwise,
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* Verify the Functionality of system call
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* if successful,
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* Issue Functionality-Pass message.
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* Otherwise,
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* Issue Functionality-Fail message.
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* Cleanup:
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* Print errno log and/or timing stats if options given
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* Delete the temporary directory created.
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*
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* Usage: <for command-line>
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* mmap05 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
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* where, -c n : Run n copies concurrently.
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* -f : Turn off functionality Testing.
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* -i n : Execute test n times.
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* -I x : Execute test for x seconds.
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* -P x : Pause for x seconds between iterations.
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* -t : Turn on syscall timing.
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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*
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* RESTRICTIONS:
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* None.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <setjmp.h>
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#include "test.h"
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#include "usctest.h"
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#define TEMPFILE "mmapfile"
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const char *TCID="mmap05"; /* Test program identifier. */
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int TST_TOTAL=1; /* Total number of test cases. */
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extern int Tst_count; /* Test Case counter for tst_* routines */
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size_t page_sz; /* system page size */
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char *addr; /* addr of memory mapped region */
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int fildes = -1; /* file descriptor for temporary file */
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int pass=0; /* pass flag perhaps set to 1 in sig_handler */
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sigjmp_buf env; /* environment for sigsetjmp/siglongjmp */
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void setup(); /* Main setup function of test */
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void cleanup(void) __attribute__((noreturn)); /* cleanup function for the test */
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void sig_handler(); /* signal handler to catch SIGSEGV */
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int
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main(int ac, char **av)
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{
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int lc; /* loop counter */
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const char *msg; /* message returned from parse_opts */
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char file_content; /* tempfile content */
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/* Parse standard options given to run the test. */
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msg = parse_opts(ac, av, (option_t *) NULL, NULL);
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if (msg != (char *) NULL) {
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tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
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tst_exit();
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}
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/* Perform global setup for test */
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setup();
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/* Check looping state if -i option given */
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/* Reset Tst_count in case we are looping. */
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Tst_count=0;
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/*
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* Call mmap to map the temporary file 'TEMPFILE'
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* with no access.
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*/
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TEST(mmap(0, page_sz, PROT_NONE,
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MAP_FILE|MAP_SHARED, fildes, 0));
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/* Check for the return value of mmap() */
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if (TEST_RETURN == (int)MAP_FAILED) {
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tst_resm(TFAIL, "mmap() Failed on %s, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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continue;
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}
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/*
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* Perform functional verification if test
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* executed without (-f) option.
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*/
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if (STD_FUNCTIONAL_TEST) {
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/*
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* Try to access the mapped region. This should
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* generate a SIGSEGV which will be caught below.
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*
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* This is wrapped by the sigsetjmp() call that will
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* take care of restoring the program's context in an
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* elegant way in conjunction with the call to
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* siglongjmp() in the signal handler.
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*/
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if (sigsetjmp(env, 1) == 0) {
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file_content = addr[0];
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}
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if (pass) {
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tst_resm(TPASS, "Got SIGSEGV as expected");
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} else {
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tst_resm(TFAIL, "Mapped memory region with NO "
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"access is accessible");
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}
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} else {
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tst_resm(TPASS, "call succeeded");
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}
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/* Unmap mapped memory and reset pass in case we are looping */
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if (munmap(addr, page_sz) != 0) {
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tst_brkm(TFAIL, cleanup, "munmap() fails to unmap the "
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"memory, errno=%d", errno);
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}
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pass = 0;
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} /* End for TEST_LOOPING */
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/* Call cleanup() to undo setup done for the test. */
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cleanup();
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/*NOTREACHED*/
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} /* End main */
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/*
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* setup() - performs all ONE TIME setup for this test.
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* Get the system page size.
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* Create a temporary directory and a file under it.
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* Write some known data into file and close it.
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* Change the mode permissions on file to 0444
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* Re-open the file for reading.
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*/
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void
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setup()
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{
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char *tst_buff; /* test buffer to hold known data */
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/* capture signals */
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tst_sig(NOFORK, sig_handler, cleanup);
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/* Pause if that option was specified */
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TEST_PAUSE;
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/* Get the system page size */
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if ((page_sz = getpagesize()) < 0) {
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tst_brkm(TFAIL, NULL,
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"getpagesize() fails to get system page size");
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tst_exit();
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}
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/* Allocate space for the test buffer */
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if ((tst_buff = (char *)calloc(page_sz, sizeof(char))) == NULL) {
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tst_brkm(TFAIL, NULL,
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"calloc() failed to allocate space for tst_buff");
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tst_exit();
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}
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/* Fill the test buffer with the known data */
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memset(tst_buff, 'A', page_sz);
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/* make a temp directory and cd to it */
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tst_tmpdir();
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/* Creat a temporary file used for mapping */
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if ((fildes = open(TEMPFILE, O_WRONLY | O_CREAT, 0666)) < 0) {
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tst_brkm(TFAIL, NULL, "open() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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free(tst_buff);
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cleanup();
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}
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/* Write test buffer contents into temporary file */
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if (write(fildes, tst_buff, strlen(tst_buff)) != strlen(tst_buff)) {
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tst_brkm(TFAIL, NULL, "write() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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free(tst_buff);
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cleanup();
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}
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/* Free the memory allocated for test buffer */
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free(tst_buff);
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/* Close the temporary file opened for write */
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if (close(fildes) < 0) {
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tst_brkm(TFAIL, cleanup, "close() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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/* Make sure proper permissions set on file */
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if (chmod(TEMPFILE, 0444) < 0) {
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tst_brkm(TFAIL, cleanup, "chmod() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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/* Open the temporary file again for reading */
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if ((fildes = open(TEMPFILE, O_RDONLY)) < 0) {
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tst_brkm(TFAIL, cleanup, "open(%s) with read-only Failed, "
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"errno:%d", TEMPFILE, errno);
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}
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}
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/*
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* sig_handler() - Signal Cathing function.
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* This function gets executed when the test process receives
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* the signal SIGSEGV while trying to access the contents of memory which
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* is not accessible.
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*/
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void
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sig_handler(sig)
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{
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if (sig == SIGSEGV) {
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/* set the global variable and jump back */
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pass = 1;
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siglongjmp(env, 1);
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} else {
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tst_brkm(TBROK, cleanup, "received an unexpected signal");
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}
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}
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/*
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* cleanup() - performs all ONE TIME cleanup for this test at
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* completion or premature exit.
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* Remove the temporary directory created.
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*/
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void
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cleanup()
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{
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/*
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* print timing stats if that option was specified.
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* print errno log if that option was specified.
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*/
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TEST_CLEANUP;
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if (fildes >= 0)
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close (fildes);
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/* Remove tmp dir and all files in it */
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tst_rmdir();
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/* exit with return code appropriate for results */
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tst_exit();
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}
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