1 /* 2 * Check decoding of setfsuid/setfsgid/setfsuid32/setfsgid32 syscalls. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org> 5 * Copyright (c) 2016-2017 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 <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 48 const kernel_ulong_t tests[] = { 49 ugid, 50 0xffff0000U | ugid, 51 F8ILL_KULONG_MASK | ugid, 52 0xffffU, 53 -1U, 54 -1L, 55 0xc0deffffU, 56 0xfacefeedU, 57 (long) 0xfacefeeddeadbeefULL 58 }; 59 60 unsigned int i; 61 62 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 63 const unsigned int num = (unsigned UGID_TYPE) tests[i]; 64 unsigned int rc; 65 66 rc = syscall(SYSCALL_NR, tests[i]); 67 printf("%s(", SYSCALL_NAME); 68 printuid(num); 69 printf(") = %u\n", rc); 70 71 rc = syscall(SYSCALL_NR, ugid); 72 printf("%s(%u) = %u\n", SYSCALL_NAME, ugid, rc); 73 } 74 75 puts("+++ exited with 0 +++"); 76 return 0; 77 } 78