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1// SPDX-License-Identifier: GPL-2.0-or-later2/******************************************************************************3 *4 * Copyright FUJITSU LIMITED 20105 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>6 *7 * DESCRIPTION8 * Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should9 * return immediately. This test is intent to test zero page handling in10 * futex.11 *12 * AUTHOR13 * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>14 *15 * HISTORY16 * 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 500000037 38static int child_blocked = 1;39static int child_ret;40void *buf;41 42void 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 51void *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 66int 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