[LTP] [PATCH v2 1/3] syscalls: munmap01: Convert to new API
Ricardo B. Marlière
rbm@suse.com
Fri Jul 4 17:40:09 CEST 2025
From: Ricardo B. Marlière <rbm@suse.com>
Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
---
testcases/kernel/syscalls/munmap/munmap01.c | 265 ++++++----------------------
1 file changed, 56 insertions(+), 209 deletions(-)
diff --git a/testcases/kernel/syscalls/munmap/munmap01.c b/testcases/kernel/syscalls/munmap/munmap01.c
index dfd81fa2b32de2354a8053c4b7ebf1d518b8bb67..c4c81295277f4951b2ddec96ce4b7ef767c65fbf 100644
--- a/testcases/kernel/syscalls/munmap/munmap01.c
+++ b/testcases/kernel/syscalls/munmap/munmap01.c
@@ -1,235 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright (c) International Business Machines Corp., 2001
+ * 07/2001 Ported by Wayne Boyer
+ * Copyright (c) 2025 SUSE LLC Ricardo B. Marlière <rbm@suse.com>
*/
-/*
- * Test Name: munmap01
- *
- * Test Description:
- * Verify that, munmap call will succeed to unmap a mapped file or
- * anonymous shared memory region from the calling process's address space
- * and after successful completion of munmap, the unmapped region is no
- * longer accessible.
- *
- * Expected Result:
- * munmap call should succeed to unmap a mapped file or anonymous shared
- * memory region from the process's address space and it returns with a
- * value 0, further reference to the unmapped region should result in a
- * segmentation fault (SIGSEGV).
+/*\
+ * Verify that, munmap call will succeed to unmap a mapped file or
+ * anonymous shared memory region from the calling process's address space
+ * and after successful completion of munmap, the unmapped region is no
+ * longer accessible.
*
- * Algorithm:
- * Setup:
- * Setup signal handling.
- * Create temporary directory.
- * Pause for SIGUSR1 if option specified.
- *
- * 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>
- * munmap01 [-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.$
+ * munmap call should succeed to unmap a mapped file or anonymous shared
+ * memory region from the process's address space and it returns with a
+ * value 0, further reference to the unmapped region should result in a
+ * segmentation fault (SIGSEGV).
*/
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-
-#include "test.h"
-#include "safe_macros.h"
-
-#define TEMPFILE "mmapfile"
-char *TCID = "munmap01";
-int TST_TOTAL = 1;
+#include "tst_test.h"
-char *addr; /* addr of memory mapped region */
-int fildes; /* file descriptor for tempfile */
-unsigned int map_len; /* length of the region to be mapped */
+static int fd;
+static int mapped;
+static char *map_addr;
+static unsigned int map_len;
-void setup(); /* Main setup function of test */
-void cleanup(); /* cleanup function for the test */
-void sig_handler(); /* signal catching function */
-
-int main(int ac, char **av)
+static void run(void)
{
- int lc;
-
- tst_parse_opts(ac, av, NULL, NULL);
-
- for (lc = 0; TEST_LOOPING(lc); lc++) {
-
- tst_count = 0;
-
- setup();
-
- /*
- * Call munmap to unmap the mapped region of the
- * temporary file from the calling process's address space.
- */
- TEST(munmap(addr, map_len));
-
- /* Check for the return value of munmap() */
- if (TEST_RETURN == -1) {
- tst_resm(TFAIL, "munmap() fails, errno=%d : %s",
- TEST_ERRNO, strerror(TEST_ERRNO));
- continue;
- }
+ int status;
- /*
- * Check whether further reference is possible
- * to the unmapped memory region by writing
- * to the first byte of region with
- * some arbitrary number.
- */
- *addr = 50;
+ SAFE_MUNMAP(map_addr, map_len);
+ mapped = 0;
- /* This message is printed if no SIGSEGV */
- tst_resm(TFAIL, "process succeeds to refer unmapped memory region");
-
- cleanup();
+ /*
+ * Check whether further reference is possible to the unmapped memory
+ * region by writing to the first byte of region with some arbitrary
+ * number.
+ */
+ if (!SAFE_FORK()) {
+ *map_addr = 50;
+ _exit(0);
+ }
+ SAFE_WAIT(&status);
+ if (WIFSIGNALED(status) && WTERMSIG(status) == SIGSEGV) {
+ tst_res(TPASS, "Child was unable to access unmapped memory");
+ return;
}
- tst_exit();
+ tst_res(TFAIL, "Child succeeds to refer unmapped memory region");
}
-/*
- * setup() - performs all ONE TIME setup for this test.
- *
- * Set up signal handler to catch SIGSEGV.
- * Get system page size, create a temporary file for reading/writing,
- * write one byte data into it, map the open file for the specified
- * map length.
- */
-void setup(void)
+static void setup(void)
{
- size_t page_sz;
+ size_t page_sz = SAFE_SYSCONF(_SC_PAGESIZE);
- tst_sig(NOFORK, DEF_HANDLER, cleanup);
-
- /* call signal function to trap the signal generated */
- if (signal(SIGSEGV, sig_handler) == SIG_ERR) {
- tst_brkm(TBROK, cleanup, "signal fails to catch signal");
- }
-
- TEST_PAUSE;
-
- /* Get the system page size */
- page_sz = getpagesize();
-
- /*
- * Get the length of the open file to be mapped into process
- * address space.
- */
map_len = 3 * page_sz;
- tst_tmpdir();
+ fd = SAFE_OPEN("mmapfile", O_RDWR | O_CREAT, 0666);
- /* Creat a temporary file used for mapping */
- if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
- tst_brkm(TBROK, cleanup, "open() on %s Failed, errno=%d : %s",
- TEMPFILE, errno, strerror(errno));
- }
-
- /*
- * move the file pointer to maplength position from the beginning
- * of the file.
- */
- SAFE_LSEEK(cleanup, fildes, map_len, SEEK_SET);
-
- /* Write one byte into temporary file */
- if (write(fildes, "a", 1) != 1) {
- tst_brkm(TBROK, cleanup, "write() on %s Failed, errno=%d : %s",
- TEMPFILE, errno, strerror(errno));
- }
-
- /*
- * map the open file 'TEMPFILE' from its beginning up to the maplength
- * into the calling process's address space at the system choosen
- * with read/write permissions to the mapped region.
- */
- addr = mmap(0, map_len, PROT_READ | PROT_WRITE,
- MAP_FILE | MAP_SHARED, fildes, 0);
-
- /* check for the return value of mmap system call */
- if (addr == (char *)MAP_FAILED) {
- tst_brkm(TBROK, cleanup, "mmap() Failed on %s, errno=%d : %s",
- TEMPFILE, errno, strerror(errno));
- }
+ SAFE_LSEEK(fd, map_len, SEEK_SET);
+ SAFE_WRITE(SAFE_WRITE_ALL, fd, "a", 1);
+ map_addr = SAFE_MMAP(0, map_len, PROT_READ | PROT_WRITE,
+ MAP_FILE | MAP_SHARED, fd, 0);
+ mapped = 1;
}
-/*
- * sig_handler() - signal catching function.
- * This function is used to trap the signal generated when tried to read or
- * write to the memory mapped region which is already detached from the
- * calling process address space.
- * this function is invoked when SIGSEGV generated and it calls test
- * cleanup function and exit the program.
- */
-void sig_handler(void)
+static void cleanup(void)
{
- tst_resm(TPASS, "Functionality of munmap() successful");
-
- /* Invoke test cleanup function and exit */
- cleanup();
-
- tst_exit();
+ if (mapped)
+ SAFE_MUNMAP(map_addr, map_len);
+ if (fd)
+ SAFE_CLOSE(fd);
}
-/*
- * cleanup() - performs all ONE TIME cleanup for this test at
- * completion or premature exit.
- * Close the temporary file.
- * Remove the temporary directory.
- */
-void cleanup(void)
-{
-
- /* Close the temporary file */
- if (close(fildes) < 0) {
- tst_brkm(TFAIL, NULL, "close() on %s Failed, errno=%d : %s",
- TEMPFILE, errno, strerror(errno));
- }
-
- tst_rmdir();
-}
+static struct tst_test test = {
+ .test_all = run,
+ .setup = setup,
+ .cleanup = cleanup,
+ .needs_tmpdir = 1,
+ .forks_child = 1,
+};
--
2.50.0
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