1 /* 2 * Check decoding of set_mempolicy syscall. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "tests.h" 31 #include <asm/unistd.h> 32 33 #ifdef __NR_set_mempolicy 34 35 # include <errno.h> 36 # include <stdio.h> 37 # include <string.h> 38 # include <unistd.h> 39 40 # include "xlat.h" 41 # include "xlat/policies.h" 42 43 # define MAX_STRLEN 3 44 # define NLONGS(n) ((n + 8 * sizeof(long) - 2) \ 45 / (8 * sizeof(long))) 46 47 static void 48 print_nodes(const unsigned long maxnode, unsigned int offset) 49 { 50 unsigned int nlongs = NLONGS(maxnode); 51 if (nlongs <= offset) 52 nlongs = 0; 53 else 54 nlongs -= offset; 55 const unsigned int size = nlongs * sizeof(long); 56 unsigned long *const nodemask = 57 tail_alloc(size ? size : (offset ? 1 : 0)); 58 memset(nodemask, 0, size); 59 60 long rc = syscall(__NR_set_mempolicy, 0, nodemask, maxnode); 61 const char *errstr = sprintrc(rc); 62 63 fputs("set_mempolicy(MPOL_DEFAULT, ", stdout); 64 65 if (nlongs) { 66 putc('[', stdout); 67 unsigned int i; 68 for (i = 0; i < nlongs + offset; ++i) { 69 if (i) 70 fputs(", ", stdout); 71 if (i < nlongs) { 72 if (i >= MAX_STRLEN) { 73 fputs("...", stdout); 74 break; 75 } 76 printf("%#0*lx", (int) sizeof(long) * 2 + 2, 77 nodemask[i]); 78 } else { 79 printf("%p", nodemask + i); 80 break; 81 } 82 } 83 putc(']', stdout); 84 } else { 85 if (maxnode) 86 printf("%p", nodemask); 87 else 88 printf("[]"); 89 } 90 91 printf(", %lu) = %s\n", maxnode, errstr); 92 } 93 94 static void 95 test_offset(const unsigned int offset) 96 { 97 unsigned long maxnode = get_page_size() * 8; 98 99 print_nodes(maxnode, offset); 100 print_nodes(maxnode + 1, offset); 101 print_nodes(maxnode + 2, offset); 102 103 maxnode = sizeof(long) * 8; 104 print_nodes(0, offset); 105 print_nodes(1, offset); 106 print_nodes(2, offset); 107 print_nodes(maxnode - 1, offset); 108 print_nodes(maxnode , offset); 109 print_nodes(maxnode + 1, offset); 110 print_nodes(maxnode + 2, offset); 111 print_nodes(maxnode * 2 - 1, offset); 112 print_nodes(maxnode * 2 , offset); 113 print_nodes(maxnode * 2 + 1, offset); 114 print_nodes(maxnode * 2 + 2, offset); 115 print_nodes(maxnode * 3 - 1, offset); 116 print_nodes(maxnode * 3 , offset); 117 print_nodes(maxnode * 3 + 1, offset); 118 print_nodes(maxnode * 3 + 2, offset); 119 print_nodes(maxnode * 4 + 2, offset); 120 } 121 122 int 123 main(void) 124 { 125 if (syscall(__NR_set_mempolicy, 0, 0, 0)) 126 perror_msg_and_skip("set_mempolicy"); 127 puts("set_mempolicy(MPOL_DEFAULT, NULL, 0) = 0"); 128 129 const unsigned long *nodemask = (void *) 0xfacefeedfffffffeULL; 130 const unsigned long maxnode = (unsigned long) 0xcafef00dbadc0dedULL; 131 long rc = syscall(__NR_set_mempolicy, 1, nodemask, maxnode); 132 printf("set_mempolicy(MPOL_PREFERRED, %p, %lu) = %s\n", 133 nodemask, maxnode, sprintrc(rc)); 134 135 test_offset(0); 136 test_offset(1); 137 138 puts("+++ exited with 0 +++"); 139 return 0; 140 } 141 142 #else 143 144 SKIP_MAIN_UNDEFINED("__NR_set_mempolicy") 145 146 #endif 147
