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syscalls/mmap01: Rewrite the test using new LTP API
- use SAFE_MSYNC() macro - fixed the test for iterations > 1 - enable test for all filesystems Signed-off-by: Avinesh Kumar <[email protected]>
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| // 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 | ||
| * 07/2001 Ported by Wayne Boyer | ||
| * Copyright (c) 2023 SUSE LLC Avinesh Kumar <[email protected]> | ||
| */ | ||
|
|
||
| /* | ||
| * Test Description: | ||
| * Verify that, mmap() succeeds when used to map a file where size of the | ||
| * file is not a multiple of the page size, the memory area beyond the end | ||
| * of the file to the end of the page is accessible. Also, verify that | ||
| * this area is all zeroed and the modifications done to this area are | ||
| * not written to the file. | ||
| * | ||
| * Expected Result: | ||
| * mmap() should succeed returning the address of the mapped region. | ||
| * The memory area beyond the end of file to the end of page should be | ||
| * filled with zero. | ||
| * The changes beyond the end of file should not get written to the file. | ||
| /*\ | ||
| * [Description] | ||
| * | ||
| * HISTORY | ||
| * 07/2001 Ported by Wayne Boyer | ||
| * Verify that, mmap() succeeds when used to map a file where size of the | ||
| * file is not a multiple of the page size, the memory area beyond the end | ||
| * of the file to the end of the page is accessible. Also, verify that | ||
| * this area is all zeroed and the modifications done to this area are | ||
| * not written to the file. | ||
| */ | ||
| #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 <stdint.h> | ||
| #include <sys/stat.h> | ||
| #include <sys/mman.h> | ||
| #include <sys/shm.h> | ||
|
|
||
| #include "test.h" | ||
|
|
||
| #define TEMPFILE "mmapfile" | ||
| #include <stdlib.h> | ||
| #include "tst_test.h" | ||
|
|
||
| char *TCID = "mmap01"; | ||
| int TST_TOTAL = 1; | ||
| #define MNT_POINT "mntpoint" | ||
| #define TEMPFILE MNT_POINT"/mmapfile" | ||
|
|
||
| static char *addr; | ||
| static char *dummy; | ||
| static int fd; | ||
| static size_t page_sz; | ||
| static size_t file_sz; | ||
| static int fildes; | ||
| static char cmd_buffer[BUFSIZ]; | ||
|
|
||
| static void setup(void); | ||
| static void cleanup(void); | ||
| static char *addr; | ||
| static char *dummy; | ||
| static struct stat stat_buf; | ||
| static const char write_buf[] = "HelloWorld!"; | ||
|
|
||
| int main(int ac, char **av) | ||
| static void setup(void) | ||
| { | ||
| int lc; | ||
|
|
||
| tst_parse_opts(ac, av, NULL, NULL); | ||
|
|
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| setup(); | ||
|
|
||
| for (lc = 0; TEST_LOOPING(lc); lc++) { | ||
|
|
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| tst_count = 0; | ||
|
|
||
| /* | ||
| * Call mmap to map the temporary file beyond EOF | ||
| * with write access. | ||
| */ | ||
| errno = 0; | ||
| addr = mmap(NULL, page_sz, PROT_READ | PROT_WRITE, | ||
| MAP_FILE | MAP_SHARED, fildes, 0); | ||
|
|
||
| /* Check for the return value of mmap() */ | ||
| if (addr == MAP_FAILED) { | ||
| tst_resm(TFAIL | TERRNO, "mmap of %s failed", TEMPFILE); | ||
| continue; | ||
| } | ||
|
|
||
| /* | ||
| * Check if mapped memory area beyond EOF are | ||
| * zeros and changes beyond EOF are not written | ||
| * to file. | ||
| */ | ||
| if (memcmp(&addr[file_sz], dummy, page_sz - file_sz)) { | ||
| tst_brkm(TFAIL, cleanup, | ||
| "mapped memory area contains invalid " | ||
| "data"); | ||
| } | ||
|
|
||
| /* | ||
| * Initialize memory beyond file size | ||
| */ | ||
| addr[file_sz] = 'X'; | ||
| addr[file_sz + 1] = 'Y'; | ||
| addr[file_sz + 2] = 'Z'; | ||
|
|
||
| /* | ||
| * Synchronize the mapped memory region | ||
| * with the file. | ||
| */ | ||
| if (msync(addr, page_sz, MS_SYNC) != 0) { | ||
| tst_brkm(TFAIL | TERRNO, cleanup, | ||
| "failed to synchronize mapped file"); | ||
| } | ||
|
|
||
| /* | ||
| * Now, Search for the pattern 'XYZ' in the | ||
| * temporary file. The pattern should not be | ||
| * found and the return value should be 1. | ||
| */ | ||
| if (system(cmd_buffer) != 0) { | ||
| tst_resm(TPASS, | ||
| "Functionality of mmap() successful"); | ||
| } else { | ||
| tst_resm(TFAIL, | ||
| "Specified pattern found in file"); | ||
| } | ||
|
|
||
| /* Clean up things in case we are looping */ | ||
| /* Unmap the mapped memory */ | ||
| if (munmap(addr, page_sz) != 0) { | ||
| tst_brkm(TFAIL | TERRNO, NULL, "munmap failed"); | ||
| } | ||
| } | ||
| fd = SAFE_OPEN(TEMPFILE, O_RDWR | O_CREAT, 0666); | ||
|
|
||
| cleanup(); | ||
| tst_exit(); | ||
| } | ||
| SAFE_WRITE(SAFE_WRITE_ALL, fd, write_buf, strlen(write_buf)); | ||
| SAFE_LSEEK(fd, 0, SEEK_SET); | ||
| SAFE_STAT(TEMPFILE, &stat_buf); | ||
|
|
||
| static void setup(void) | ||
| { | ||
| struct stat stat_buf; | ||
| char Path_name[PATH_MAX]; | ||
| char write_buf[] = "hello world\n"; | ||
| file_sz = stat_buf.st_size; | ||
| page_sz = getpagesize(); | ||
|
|
||
| tst_sig(FORK, DEF_HANDLER, cleanup); | ||
| dummy = SAFE_MALLOC(page_sz); | ||
| memset(dummy, 0, page_sz); | ||
| } | ||
|
|
||
| TEST_PAUSE; | ||
| static void run(void) | ||
| { | ||
| char buf[20]; | ||
|
|
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| tst_tmpdir(); | ||
| addr = SAFE_MMAP(NULL, page_sz, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0); | ||
|
|
||
| /* Get the path of temporary file to be created */ | ||
| if (getcwd(Path_name, sizeof(Path_name)) == NULL) { | ||
| tst_brkm(TFAIL | TERRNO, cleanup, | ||
| "getcwd failed to get current working directory"); | ||
| if (memcmp(&addr[file_sz], dummy, page_sz - file_sz) != 0) { | ||
| tst_res(TFAIL, "mapped memory area contains invalid data"); | ||
| goto unmap; | ||
| } | ||
|
|
||
| /* Creat a temporary file used for mapping */ | ||
| if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) { | ||
| tst_brkm(TFAIL, cleanup, "opening %s failed", TEMPFILE); | ||
| } | ||
| addr[file_sz] = 'X'; | ||
| addr[file_sz + 1] = 'Y'; | ||
| addr[file_sz + 2] = 'Z'; | ||
|
|
||
| /* Write some data into temporary file */ | ||
| if (write(fildes, write_buf, strlen(write_buf)) != (long)strlen(write_buf)) { | ||
| tst_brkm(TFAIL, cleanup, "writing to %s", TEMPFILE); | ||
| } | ||
| SAFE_MSYNC(addr, page_sz, MS_SYNC); | ||
|
|
||
| /* Get the size of temporary file */ | ||
| if (stat(TEMPFILE, &stat_buf) < 0) { | ||
| tst_brkm(TFAIL | TERRNO, cleanup, "stat of %s failed", | ||
| TEMPFILE); | ||
| } | ||
| file_sz = stat_buf.st_size; | ||
| SAFE_FILE_SCANF(TEMPFILE, "%s", buf); | ||
|
|
||
| page_sz = getpagesize(); | ||
| if (strcmp(write_buf, buf)) | ||
| tst_res(TFAIL, "File data has changed"); | ||
| else | ||
| tst_res(TPASS, "mmap() functionality successful"); | ||
|
|
||
| /* Allocate and initialize dummy string of system page size bytes */ | ||
| if ((dummy = calloc(page_sz, sizeof(char))) == NULL) { | ||
| tst_brkm(TFAIL, cleanup, "calloc failed (dummy)"); | ||
| } | ||
| SAFE_LSEEK(fd, 0, SEEK_SET); | ||
| memset(&addr[file_sz], 0, 3); | ||
|
|
||
| /* Create the command which will be executed in the test */ | ||
| sprintf(cmd_buffer, "grep XYZ %s/%s > /dev/null", Path_name, TEMPFILE); | ||
| unmap: | ||
| SAFE_MUNMAP(addr, page_sz); | ||
| } | ||
|
|
||
| static void cleanup(void) | ||
| { | ||
| close(fildes); | ||
| if (fd > 0) | ||
| SAFE_CLOSE(fd); | ||
|
|
||
| free(dummy); | ||
| tst_rmdir(); | ||
| } | ||
|
|
||
| static struct tst_test test = { | ||
| .setup = setup, | ||
| .test_all = run, | ||
| .cleanup = cleanup, | ||
| .mntpoint = MNT_POINT, | ||
| .mount_device = 1, | ||
| .all_filesystems = 1 | ||
| }; |