143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/*
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* Copyright (c) 2013 FNST, DAN LI <li.dan@cn.fujitsu.com>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Test Description:
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* Verify error signal SIGBUS.
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* "Attempted access to a portion of the buffer that does not correspond
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* to the file."
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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 memory which does not correspond to the file
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* should rise the signal SIGBUS.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <unistd.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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#define TEMPFILE "mmapfile"
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char *TCID = "mmap13";
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int TST_TOTAL = 1;
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static size_t page_sz;
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static char *addr;
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static int fildes;
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static volatile sig_atomic_t pass;
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static sigjmp_buf env;
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static void setup(void);
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static void cleanup(void);
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static void sig_handler(int sig);
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int main(int argc, char *argv[])
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{
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int lc;
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char *ch;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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addr = mmap(NULL, page_sz * 2, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fildes, 0);
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if (addr == MAP_FAILED) {
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tst_resm(TFAIL | TERRNO, "mmap() failed on %s",
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TEMPFILE);
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continue;
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}
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if (sigsetjmp(env, 1) == 0) {
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ch = addr + page_sz + 1;
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*ch = 0;
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}
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if (pass)
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tst_resm(TPASS, "Got SIGBUS "
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"as expected");
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else
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tst_resm(TFAIL, "Invalid access not "
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"rise SIGBUS");
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if (munmap(addr, page_sz * 2) != 0)
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tst_brkm(TFAIL | TERRNO, cleanup,
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"failed to unmap the mmapped pages");
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pass = 0;
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}
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cleanup();
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tst_exit();
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}
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static void setup(void)
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{
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tst_sig(NOFORK, sig_handler, cleanup);
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TEST_PAUSE;
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page_sz = getpagesize();
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tst_tmpdir();
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fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0766);
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if (fildes < 0)
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tst_brkm(TFAIL | TERRNO, cleanup, "opening %s failed",
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TEMPFILE);
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if (ftruncate(fildes, page_sz / 2) == -1)
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tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate %s failed",
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TEMPFILE);
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}
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/*
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* This function gets executed when the test process receives
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* the signal SIGBUS while trying to access the memory which
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* does not correspond to the file.
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*/
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static void sig_handler(int sig)
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{
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if (sig == SIGBUS) {
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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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static void cleanup(void)
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{
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close(fildes);
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tst_rmdir();
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}
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