| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2. |
| * |
| * 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. |
| * |
| * Test that the owner is unchanged when O_TRUNC is set, the shared memory |
| * object exists and it is successfully opened O_RDWR. |
| * |
| * In most case this test will be unresolved if not run by root. |
| * Steps: |
| * 1. Create a shared memory object. |
| * 2. Set a non zero size for this object (to force the modification of the |
| * object when it will be reopen with O_TRUNC set). |
| * 3. Set his effective user id to an other user id which is not root. |
| * 4. Call shm_open with O_TRUNC set. |
| * 5. Check that the owner is unchanged. |
| */ |
| |
| /* getpwent() is part of XSI option */ |
| #define _XOPEN_SOURCE 600 |
| |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <pwd.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include "posixtest.h" |
| |
| #define BUF_SIZE 8 |
| #define SHM_NAME "posixtest_26-2" |
| |
| int main() { |
| int fd; |
| struct stat stat_buf; |
| struct passwd *pw; |
| uid_t old_uid; |
| gid_t old_gid; |
| |
| umask(0); |
| fd = shm_open(SHM_NAME, O_RDWR|O_CREAT, |
| S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); |
| |
| if (fd == -1) { |
| perror("An error occurs when calling shm_open()"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (ftruncate(fd, BUF_SIZE) != 0) { |
| perror("An error occurs when calling ftruncate()"); |
| shm_unlink(SHM_NAME); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (fstat(fd, &stat_buf) != 0) { |
| perror("An error occurs when calling fstat()"); |
| shm_unlink(SHM_NAME); |
| return PTS_UNRESOLVED; |
| } |
| old_uid = stat_buf.st_uid; |
| old_gid = stat_buf.st_gid; |
| |
| /* search for the first user which is non root and which is not the |
| current user */ |
| while ((pw = getpwent()) != NULL) |
| if (strcmp(pw->pw_name, "root") && pw->pw_uid != getuid()) |
| break; |
| |
| if (pw == NULL) { |
| printf("There is no other user than current and root.\n"); |
| shm_unlink(SHM_NAME); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (seteuid(pw->pw_uid) != 0) { |
| if (errno == EPERM) { |
| printf("You don't have permission to change your UID.\nTry to rerun this test as root.\n"); |
| } else { |
| perror("An error occurs when calling seteuid()"); |
| } |
| shm_unlink(SHM_NAME); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("Testing with user '%s' (uid: %i)\n", |
| pw->pw_name, pw->pw_uid); |
| |
| fd = shm_open(SHM_NAME, O_RDWR|O_TRUNC, 0); |
| if (fd == -1) { |
| perror("An error occurs when calling shm_open()"); |
| seteuid(getuid()); |
| shm_unlink(SHM_NAME); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (fstat(fd, &stat_buf) != 0) { |
| perror("An error occurs when calling fstat()"); |
| seteuid(getuid()); |
| shm_unlink(SHM_NAME); |
| return PTS_UNRESOLVED; |
| } |
| |
| seteuid(getuid()); |
| shm_unlink(SHM_NAME); |
| |
| if (stat_buf.st_uid == old_uid && stat_buf.st_gid == old_gid) { |
| printf("Test PASSED\n"); |
| return PTS_PASS; |
| } |
| |
| if (stat_buf.st_uid != old_uid) |
| printf("The user ID has changed.\n"); |
| if (stat_buf.st_gid != old_gid) |
| printf("The group ID has changed.\n"); |
| return PTS_FAIL; |
| } |