1d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes/* 2d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Check how seccomp SECCOMP_SET_MODE_STRICT is decoded. 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 "tests.h" 31d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <asm/unistd.h> 32d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 33d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#if defined __NR_seccomp && defined __NR_exit 34d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 35d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes# include <stdio.h> 36d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes# include <unistd.h> 37d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 38d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesint 39d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesmain(void) 40d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{ 41d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char text1[] = 42d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes "seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL) = 0\n"; 43d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char text2[] = "+++ exited with 0 +++\n"; 44d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL; 45d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes long rc; 46d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 47d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = syscall(__NR_seccomp, -1L, -1L, addr); 48d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf("seccomp(%#x /* SECCOMP_SET_MODE_??? */, %u, %#llx)" 49d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " = %s\n", -1, -1, (unsigned long long) addr, sprintrc(rc)); 50d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fflush(stdout); 51d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 52d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = syscall(__NR_seccomp, 0, 0, 0); 53d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes if (rc) { 54d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes printf("seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL) = %s\n", 55d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes sprintrc(rc)); 56d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fflush(stdout); 57d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = 0; 58d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } else { 59d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes /* 60d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * If kernel implementaton of SECCOMP_MODE_STRICT is buggy, 61d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * the following syscall will result to SIGKILL. 62d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes */ 63d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = write(1, text1, LENGTH_OF(text1)) != LENGTH_OF(text1); 64d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 65d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 66d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc += write(1, text2, LENGTH_OF(text2)) != LENGTH_OF(text2); 67d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes return !!syscall(__NR_exit, rc); 68d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes} 69d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 70d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#else 71d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 72d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott HughesSKIP_MAIN_UNDEFINED("__NR_seccomp && __NR_exit") 73d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 74d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#endif 75