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Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c b/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c new file mode 100644 index 000000000..ed9cd07e3 --- /dev/null +++ b/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/****************************************************************************** + * + * Copyright FUJITSU LIMITED 2010 + * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> + * + * DESCRIPTION + * Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should + * return immediately. This test is intent to test zero page handling in + * futex. + * + * AUTHOR + * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> + * + * HISTORY + * 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> + * + *****************************************************************************/ + +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/mman.h> +#include <syscall.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <errno.h> +#include <linux/futex.h> +#include <libgen.h> + +#include "logging.h" +#include "futextest.h" + +#define TEST_NAME "futex-wait-uninitialized-heap" +#define WAIT_US 5000000 + +static int child_blocked = 1; +static int child_ret; +void *buf; + +void usage(char *prog) +{ + printf("Usage: %s\n", prog); + printf(" -c Use color\n"); + printf(" -h Display this help message\n"); + printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", + VQUIET, VCRITICAL, VINFO); +} + +void *wait_thread(void *arg) +{ + int res; + + child_ret = RET_PASS; + res = futex_wait(buf, 1, NULL, 0); + child_blocked = 0; + + if (res != 0 && errno != EWOULDBLOCK) { + error("futex failure\n", errno); + child_ret = RET_ERROR; + } + pthread_exit(NULL); +} + +int main(int argc, char **argv) +{ + int c, ret = RET_PASS; + long page_size; + pthread_t thr; + + while ((c = getopt(argc, argv, "chv:")) != -1) { + switch (c) { + case 'c': + log_color(1); + break; + case 'h': + usage(basename(argv[0])); + exit(0); + case 'v': + log_verbosity(atoi(optarg)); + break; + default: + usage(basename(argv[0])); + exit(1); + } + } + + page_size = sysconf(_SC_PAGESIZE); + + buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE, + MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); + if (buf == (void *)-1) { + error("mmap\n", errno); + exit(1); + } + + ksft_print_header(); + ksft_set_plan(1); + ksft_print_msg("%s: Test the uninitialized futex value in FUTEX_WAIT\n", + basename(argv[0])); + + + ret = pthread_create(&thr, NULL, wait_thread, NULL); + if (ret) { + error("pthread_create\n", errno); + ret = RET_ERROR; + goto out; + } + + info("waiting %dus for child to return\n", WAIT_US); + usleep(WAIT_US); + + ret = child_ret; + if (child_blocked) { + fail("child blocked in kernel\n"); + ret = RET_FAIL; + } + + out: + print_result(TEST_NAME, ret); + return ret; +} |