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
usage(char * prog)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
wait_thread(void * arg)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
main(int argc,char ** argv)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