1 /* 2 * Check decoding of setuid/setgid/setuid32/setgid32 syscalls. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org> 5 * Copyright (c) 2016-2018 The strace developers. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <errno.h> 32 #include <stdio.h> 33 #include <unistd.h> 34 35 void 36 printuid(unsigned UGID_TYPE id) 37 { 38 if (id == (unsigned UGID_TYPE) -1U) 39 printf("-1"); 40 else 41 printf("%u", id); 42 } 43 44 int 45 main(void) 46 { 47 unsigned int ugid = GETUGID; 48 CHECK_OVERFLOWUGID(ugid); 49 50 const long tests[] = { 51 ugid, 52 0xffff0000U | ugid, 53 (unsigned long) 0xffffffff00000000ULL | ugid, 54 0xffffU, 55 -1U, 56 -1L 57 }; 58 59 unsigned int i; 60 61 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 62 const unsigned int num = (unsigned UGID_TYPE) tests[i]; 63 long expected; 64 65 errno = 0; 66 67 if (num == ugid) 68 expected = 0; 69 else if ((UGID_TYPE) num == (UGID_TYPE) -1U) 70 expected = -1; 71 else 72 continue; 73 74 const long rc = syscall(SYSCALL_NR, tests[i]); 75 const char *errstr = sprintrc(rc); 76 77 if (rc != expected) { 78 if (!i && ENOSYS == errno) { 79 printf("%s(%u) = %s\n", 80 SYSCALL_NAME, ugid, errstr); 81 break; 82 } 83 perror_msg_and_fail("%s(%#lx) = %ld != %ld", 84 SYSCALL_NAME, tests[i], 85 rc, expected); 86 } 87 88 printf("%s(", SYSCALL_NAME); 89 printuid(num); 90 printf(") = %s\n", errstr); 91 } 92 93 puts("+++ exited with 0 +++"); 94 return 0; 95 } 96