1 /****************************************************************************** 2 * 3 * Copyright FUJITSU LIMITED 2010 4 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * DESCRIPTION 12 * Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should 13 * return immediately. This test is intent to test zero page handling in 14 * futex. 15 * 16 * AUTHOR 17 * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 18 * 19 * HISTORY 20 * 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 21 * 22 *****************************************************************************/ 23 24 #include <pthread.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <sys/mman.h> 28 #include <syscall.h> 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <unistd.h> 32 #include <errno.h> 33 #include <linux/futex.h> 34 #include <libgen.h> 35 36 #include "logging.h" 37 #include "futextest.h" 38 39 #define TEST_NAME "futex-wait-uninitialized-heap" 40 #define WAIT_US 5000000 41 42 static int child_blocked = 1; 43 static int child_ret; 44 void *buf; 45 46 void usage(char *prog) 47 { 48 printf("Usage: %s\n", prog); 49 printf(" -c Use color\n"); 50 printf(" -h Display this help message\n"); 51 printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", 52 VQUIET, VCRITICAL, VINFO); 53 } 54 55 void *wait_thread(void *arg) 56 { 57 int res; 58 59 child_ret = RET_PASS; 60 res = futex_wait(buf, 1, NULL, 0); 61 child_blocked = 0; 62 63 if (res != 0 && errno != EWOULDBLOCK) { 64 error("futex failure\n", errno); 65 child_ret = RET_ERROR; 66 } 67 pthread_exit(NULL); 68 } 69 70 int main(int argc, char **argv) 71 { 72 int c, ret = RET_PASS; 73 long page_size; 74 pthread_t thr; 75 76 while ((c = getopt(argc, argv, "chv:")) != -1) { 77 switch (c) { 78 case 'c': 79 log_color(1); 80 break; 81 case 'h': 82 usage(basename(argv[0])); 83 exit(0); 84 case 'v': 85 log_verbosity(atoi(optarg)); 86 break; 87 default: 88 usage(basename(argv[0])); 89 exit(1); 90 } 91 } 92 93 page_size = sysconf(_SC_PAGESIZE); 94 95 buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE, 96 MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); 97 if (buf == (void *)-1) { 98 error("mmap\n", errno); 99 exit(1); 100 } 101 102 ksft_print_header(); 103 ksft_print_msg("%s: Test the uninitialized futex value in FUTEX_WAIT\n", 104 basename(argv[0])); 105 106 107 ret = pthread_create(&thr, NULL, wait_thread, NULL); 108 if (ret) { 109 error("pthread_create\n", errno); 110 ret = RET_ERROR; 111 goto out; 112 } 113 114 info("waiting %dus for child to return\n", WAIT_US); 115 usleep(WAIT_US); 116 117 ret = child_ret; 118 if (child_blocked) { 119 fail("child blocked in kernel\n"); 120 ret = RET_FAIL; 121 } 122 123 out: 124 print_result(TEST_NAME, ret); 125 return ret; 126 } 127