@@ -1,142 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2013 FNST, DAN LI <li.dan@cn.fujitsu.com>
+ * Copyright (c) 2024 SUSE LLC Avinesh Kumar <avinesh.kumar@suse.com>
+ */
+
+/*\
+ * [Description]
*
- * 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.
+ * Verify that, mmap() call succeeds to create a file mapping with length
+ * argument greater than the file size but any attempt to reference the
+ * memory region which does not correspond to the file causes SIGBUS signal.
*
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * Test Description:
- * Verify error signal SIGBUS.
- * "Attempted access to a portion of the buffer that does not correspond
- * to the file."
+ * mmap(0, 8192, prot, MAP_FILE | MAP_SHARED, fd, 0);
+ *
+ * byte offset: 0 2047 2048 4095 4096 8191 8192
+ * +------------+------------+------------------------+
+ * Memory | | remainder | |
+ * region | | of page(0s)| |
+ * +------------+------------+------------------------+
+ * |<---------->|<---------->|<---------------------->|<--------------->
+ * | accessible,| accessible, references references
+ * | mapped | not mapped yield SIGBUS yield SIGSEGV
+ * | to file | to file
+ * | |
+ * +------------+
+ * Mapped file | |
+ * (2048 bytes) | |
+ * +------------+
+ * file offset: 0 2047
*
- * Expected Result:
- * mmap() should succeed returning the address of the mapped region,
- * and an attempt to access the memory which does not correspond to the file
- * should rise the signal SIGBUS.
+ * Note: The byte offsets in the diagram are only valid for 4Kb pages.
*/
-#include <stdio.h>
+
#include <stdlib.h>
-#include <sys/types.h>
-#include <errno.h>
-#include <unistd.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 "tst_test.h"
#define TEMPFILE "mmapfile"
-
-char *TCID = "mmap13";
-int TST_TOTAL = 1;
-
static size_t page_sz;
static char *addr;
-static int fildes;
+static int fd;
static volatile sig_atomic_t pass;
static sigjmp_buf env;
-static void setup(void);
-static void cleanup(void);
-static void sig_handler(int sig);
-
-int main(int argc, char *argv[])
+static void sig_handler(int sig)
{
- int lc;
- char *ch;
-
- tst_parse_opts(argc, argv, NULL, NULL);
-
- setup();
-
- for (lc = 0; TEST_LOOPING(lc); lc++) {
- tst_count = 0;
-
- addr = mmap(NULL, page_sz * 2, PROT_READ | PROT_WRITE,
- MAP_FILE | MAP_SHARED, fildes, 0);
-
- if (addr == MAP_FAILED) {
- tst_resm(TFAIL | TERRNO, "mmap() failed on %s",
- TEMPFILE);
- continue;
- }
-
- if (sigsetjmp(env, 1) == 0) {
- ch = addr + page_sz + 1;
- *ch = 0;
- }
-
- if (pass)
- tst_resm(TPASS, "Got SIGBUS "
- "as expected");
- else
- tst_resm(TFAIL, "Invalid access not "
- "rise SIGBUS");
-
- if (munmap(addr, page_sz * 2) != 0)
- tst_brkm(TFAIL | TERRNO, cleanup,
- "failed to unmap the mmapped pages");
-
- pass = 0;
+ if (sig == SIGBUS) {
+ pass = 1;
+ siglongjmp(env, 1);
}
-
- cleanup();
- tst_exit();
}
static void setup(void)
{
- tst_sig(NOFORK, sig_handler, cleanup);
-
- TEST_PAUSE;
+ SAFE_SIGNAL(SIGBUS, sig_handler);
page_sz = getpagesize();
- tst_tmpdir();
-
- fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0766);
- if (fildes < 0)
- tst_brkm(TFAIL | TERRNO, cleanup, "opening %s failed",
- TEMPFILE);
-
- if (ftruncate(fildes, page_sz / 2) == -1)
- tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate %s failed",
- TEMPFILE);
+ fd = SAFE_OPEN(TEMPFILE, O_RDWR | O_CREAT, 0666);
+ SAFE_FTRUNCATE(fd, page_sz / 2);
}
-/*
- * This function gets executed when the test process receives
- * the signal SIGBUS while trying to access the memory which
- * does not correspond to the file.
- */
-static void sig_handler(int sig)
+static void run(void)
{
- if (sig == SIGBUS) {
- pass = 1;
- siglongjmp(env, 1);
- } else {
- tst_brkm(TBROK, cleanup, "received an unexpected signal");
+ char *ch;
+
+ addr = mmap(0, page_sz * 2, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
+ if (addr == MAP_FAILED) {
+ tst_res(TFAIL | TERRNO, "mmap() of %s failed", TEMPFILE);
+ return;
}
+
+ if (sigsetjmp(env, 1) == 0) {
+ ch = addr + page_sz + 1;
+ *ch = 0;
+ }
+
+ if (pass == 1)
+ tst_res(TPASS, "Received SIGBUS signal as expected");
+ else
+ tst_res(TFAIL, "SIGBUS signal not received");
+
+ SAFE_MUNMAP(addr, page_sz * 2);
}
static void cleanup(void)
{
- close(fildes);
- tst_rmdir();
+ if (fd > 0)
+ SAFE_CLOSE(fd);
}
+
+static struct tst_test test = {
+ .setup = setup,
+ .cleanup = cleanup,
+ .test_all = run,
+ .needs_tmpdir = 1
+};
Signed-off-by: Avinesh Kumar <akumar@suse.de> --- testcases/kernel/syscalls/mmap/mmap13.c | 173 +++++++++--------------- 1 file changed, 65 insertions(+), 108 deletions(-)