1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv (at) altlinux.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifdef HAVE_CONFIG_H 29 # include "config.h" 30 #endif 31 32 #include <stdio.h> 33 #include <unistd.h> 34 #include <sys/mman.h> 35 #include <sys/syscall.h> 36 37 #if defined __NR_get_robust_list && defined __NR_set_robust_list 38 39 int 40 main(void) 41 { 42 const size_t page_len = sysconf(_SC_PAGESIZE); 43 const pid_t pid = getpid(); 44 const long long_pid = (unsigned long) (0xdeadbeef00000000LL | pid); 45 46 void *p = mmap(NULL, page_len * 4, PROT_READ | PROT_WRITE, 47 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 48 if (p == MAP_FAILED || 49 mprotect(p + page_len, page_len, PROT_NONE) || 50 mprotect(p + page_len * 3, page_len, PROT_NONE)) 51 return 77; 52 53 void **p_head = p + page_len - sizeof(void *); 54 size_t *p_len = p + page_len * 3 - sizeof(size_t); 55 56 if (syscall(__NR_get_robust_list, long_pid, p_head, p_len)) 57 return 77; 58 printf("get_robust_list(%d, [%#lx], [%lu]) = 0\n", 59 (int) pid, (unsigned long) *p_head, (unsigned long) *p_len); 60 61 if (syscall(__NR_set_robust_list, p, *p_len)) 62 return 77; 63 printf("set_robust_list(%#lx, %lu) = 0\n", 64 (unsigned long) p, (unsigned long) *p_len); 65 66 if (syscall(__NR_get_robust_list, long_pid, p_head, p_len)) 67 return 77; 68 printf("get_robust_list(%d, [%#lx], [%lu]) = 0\n", 69 (int) pid, (unsigned long) *p_head, (unsigned long) *p_len); 70 71 puts("+++ exited with 0 +++"); 72 return 0; 73 } 74 75 #else 76 77 int 78 main(void) 79 { 80 return 77; 81 } 82 83 #endif 84
