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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /******************************************************************************
3  *
4  * Copyright FUJITSU LIMITED 2010
5  * Copyright KOSAKI Motohiro <[email protected]>
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 <[email protected]>
14  *
15  * HISTORY
16  *      2010-Jan-6: Initial version by KOSAKI Motohiro <[email protected]>
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 }
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