1 /* 2 * Copyright (c) International Business Machines Corp., 2001 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 /* 19 * DESCRIPTION 20 * Check if setuid behaves correctly with file permissions. The test 21 * creates a file as ROOT with permissions 0644, does a setuid and then 22 * tries to open the file with RDWR permissions. The same test is done 23 * in a fork to check if new UIDs are correctly passed to the son. 24 */ 25 26 #include <errno.h> 27 #include <pwd.h> 28 #include <unistd.h> 29 #include <sys/types.h> 30 #include <fcntl.h> 31 #include "tst_test.h" 32 #include "compat_tst_16.h" 33 34 #define FILENAME "setuid04_testfile" 35 36 static void dosetuid(void); 37 38 static void verify_setuid(void) 39 { 40 pid_t pid; 41 42 pid = SAFE_FORK(); 43 if (!pid) 44 dosetuid(); 45 else 46 dosetuid(); 47 } 48 49 static void dosetuid(void) 50 { 51 int tst_fd; 52 53 TEST(tst_fd = open(FILENAME, O_RDWR)); 54 if (TST_RET != -1) { 55 tst_res(TFAIL, "open() succeeded unexpectedly"); 56 close(tst_fd); 57 return; 58 } 59 60 if (TST_ERR == EACCES) 61 tst_res(TPASS, "open() returned errno EACCES"); 62 else 63 tst_res(TFAIL | TTERRNO, "open() returned unexpected errno"); 64 } 65 66 static void setup(void) 67 { 68 struct passwd *pw; 69 uid_t uid; 70 71 pw = SAFE_GETPWNAM("nobody"); 72 uid = pw->pw_uid; 73 74 UID16_CHECK(uid, setuid); 75 /* Create test file */ 76 SAFE_TOUCH(FILENAME, 0644, NULL); 77 78 if (SETUID(uid) == -1) { 79 tst_brk(TBROK, 80 "setuid() failed to set the effective uid to %d", uid); 81 } 82 } 83 84 static struct tst_test test = { 85 .setup = setup, 86 .needs_root = 1, 87 .test_all = verify_setuid, 88 .needs_tmpdir = 1, 89 .forks_child = 1, 90 }; 91
