1 /* 2 * Check decoding of setuid/setgid/setuid32/setgid32 syscalls. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <errno.h> 31 #include <stdio.h> 32 #include <unistd.h> 33 34 void 35 printuid(unsigned UGID_TYPE id) 36 { 37 if (id == (unsigned UGID_TYPE) -1U) 38 printf("-1"); 39 else 40 printf("%u", id); 41 } 42 43 int 44 main(void) 45 { 46 unsigned int ugid = GETUGID; 47 CHECK_OVERFLOWUGID(ugid); 48 49 const long tests[] = { 50 ugid, 51 0xffff0000U | ugid, 52 (unsigned long) 0xffffffff00000000ULL | ugid, 53 0xffffU, 54 -1U, 55 -1L 56 }; 57 58 unsigned int i; 59 60 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 61 const unsigned int num = (unsigned UGID_TYPE) tests[i]; 62 long expected; 63 64 if (num == ugid) 65 expected = 0; 66 else if ((UGID_TYPE) num == (UGID_TYPE) -1U) 67 expected = -1; 68 else 69 continue; 70 71 const long rc = syscall(SYSCALL_NR, tests[i]); 72 const char *errstr = sprintrc(rc); 73 74 if (rc != expected) { 75 if (!i && ENOSYS == errno) { 76 printf("%s(%u) = %s\n", 77 SYSCALL_NAME, ugid, errstr); 78 break; 79 } 80 perror_msg_and_fail("%s(%#lx) != %ld", 81 SYSCALL_NAME, tests[i], expected); 82 } 83 84 printf("%s(", SYSCALL_NAME); 85 printuid(num); 86 printf(") = %s\n", errstr); 87 } 88 89 puts("+++ exited with 0 +++"); 90 return 0; 91 } 92
