1d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes/* 2d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Check decoding of setreuid/setregid/setreuid32/setregid32 syscalls. 3d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 4d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org> 5d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * All rights reserved. 6d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 7d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Redistribution and use in source and binary forms, with or without 8d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * modification, are permitted provided that the following conditions 9d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * are met: 10d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 1. Redistributions of source code must retain the above copyright 11d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * notice, this list of conditions and the following disclaimer. 12d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 2. Redistributions in binary form must reproduce the above copyright 13d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * notice, this list of conditions and the following disclaimer in the 14d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * documentation and/or other materials provided with the distribution. 15d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 3. The name of the author may not be used to endorse or promote products 16d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * derived from this software without specific prior written permission. 17d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 18d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes */ 29d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 30d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <errno.h> 31d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <stdio.h> 32d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <unistd.h> 33d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 34d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesstatic int 35d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesugid2int(const unsigned UGID_TYPE ugid) 36d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{ 37d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes if ((unsigned UGID_TYPE) -1U == ugid) 38d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes return -1; 39d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes else 40d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes return ugid; 41d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes} 42d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 43d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesstatic void 44d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesprint_int(const unsigned int num) 45d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{ 46d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes if (num == -1U) 47d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf("-1"); 48d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes else 49d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf("%u", num); 50d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes} 51d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 52d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesstatic int 53d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesnum_matches_id(const unsigned int num, const unsigned int ugid) 54d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{ 55d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes return num == ugid || num == -1U; 56d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes} 57d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 58d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#define PAIR(val) { val, ugid }, { ugid, val } 59d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 60d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesint 61d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesmain(void) 62d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{ 63d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes unsigned int ugid = GETUGID; 64d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes CHECK_OVERFLOWUGID(ugid); 65d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 66d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const struct { 67d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const long r, e; 68d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } tests[] = { 69d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes { ugid, ugid }, 70d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes PAIR((unsigned long) 0xffffffff00000000ULL | ugid), 71d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes PAIR(-1U), 72d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes PAIR(-1L), 73d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes PAIR(0xffff0000U | ugid), 74d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes PAIR(0xffff), 75d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes PAIR(0xc0deffffU) 76d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }; 77d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 78d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes unsigned int i; 79d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 80d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes for (i = 0; i < ARRAY_SIZE(tests); ++i) { 81d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const unsigned int rn = ugid2int(tests[i].r); 82d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const unsigned int en = ugid2int(tests[i].e); 83d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 84d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes if (!num_matches_id(rn, ugid) || !num_matches_id(en, ugid)) 85d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes continue; 86d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 87d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes if (syscall(SYSCALL_NR, tests[i].r, tests[i].e)) { 88d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes if (!i && ENOSYS == errno) { 89d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf("%s(%u, %u) = -1 ENOSYS (%m)\n", 90d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes SYSCALL_NAME, ugid, ugid); 91d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes break; 92d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 93d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes perror_msg_and_fail("%s(%#lx, %#lx)", SYSCALL_NAME, 94d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tests[i].r, tests[i].e); 95d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 96d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 97d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf("%s(", SYSCALL_NAME); 98d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes print_int(rn); 99d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf(", "); 100d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes print_int(en); 101d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf(") = 0\n"); 102d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 103d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 104d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes puts("+++ exited with 0 +++"); 105d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes return 0; 106d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes} 107