1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /****************************************************************************** 3 * 4 * Copyright FUJITSU LIMITED 2010 5 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 6 * 7 * DESCRIPTION 8 * Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should 9 * return immediately. This test is intent to test zero page handling in 10 * futex. 11 * 12 * AUTHOR 13 * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 14 * 15 * HISTORY 16 * 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 17 * 18 *****************************************************************************/ 19 20 #include <pthread.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <sys/mman.h> 24 #include <syscall.h> 25 #include <sys/types.h> 26 #include <sys/stat.h> 27 #include <unistd.h> 28 #include <errno.h> 29 #include <linux/futex.h> 30 #include <libgen.h> 31 32 #include "logging.h" 33 #include "futextest.h" 34 35 #define TEST_NAME "futex-wait-uninitialized-heap" 36 #define WAIT_US 5000000 37 38 static int child_blocked = 1; 39 static int child_ret; 40 void *buf; 41 42 void usage(char *prog) 43 { 44 printf("Usage: %s\n", prog); 45 printf(" -c Use color\n"); 46 printf(" -h Display this help message\n"); 47 printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", 48 VQUIET, VCRITICAL, VINFO); 49 } 50 51 void *wait_thread(void *arg) 52 { 53 int res; 54 55 child_ret = RET_PASS; 56 res = futex_wait(buf, 1, NULL, 0); 57 child_blocked = 0; 58 59 if (res != 0 && errno != EWOULDBLOCK) { 60 error("futex failure\n", errno); 61 child_ret = RET_ERROR; 62 } 63 pthread_exit(NULL); 64 } 65 66 int main(int argc, char **argv) 67 { 68 int c, ret = RET_PASS; 69 long page_size; 70 pthread_t thr; 71 72 while ((c = getopt(argc, argv, "chv:")) != -1) { 73 switch (c) { 74 case 'c': 75 log_color(1); 76 break; 77 case 'h': 78 usage(basename(argv[0])); 79 exit(0); 80 case 'v': 81 log_verbosity(atoi(optarg)); 82 break; 83 default: 84 usage(basename(argv[0])); 85 exit(1); 86 } 87 } 88 89 page_size = sysconf(_SC_PAGESIZE); 90 91 buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE, 92 MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); 93 if (buf == (void *)-1) { 94 error("mmap\n", errno); 95 exit(1); 96 } 97 98 ksft_print_header(); 99 ksft_set_plan(1); 100 ksft_print_msg("%s: Test the uninitialized futex value in FUTEX_WAIT\n", 101 basename(argv[0])); 102 103 104 ret = pthread_create(&thr, NULL, wait_thread, NULL); 105 if (ret) { 106 error("pthread_create\n", errno); 107 ret = RET_ERROR; 108 goto out; 109 } 110 111 info("waiting %dus for child to return\n", WAIT_US); 112 usleep(WAIT_US); 113 114 ret = child_ret; 115 if (child_blocked) { 116 fail("child blocked in kernel\n"); 117 ret = RET_FAIL; 118 } 119 120 out: 121 print_result(TEST_NAME, ret); 122 return ret; 123 } 124