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