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Linux/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c

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  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 

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