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Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c b/tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c new file mode 100644 index 000000000..d0a4d332e --- /dev/null +++ b/tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/****************************************************************************** + * + * Copyright © International Business Machines Corp., 2009 + * + * DESCRIPTION + * 1. Block a thread using FUTEX_WAIT + * 2. Attempt to use FUTEX_CMP_REQUEUE_PI on the futex from 1. + * 3. The kernel must detect the mismatch and return -EINVAL. + * + * AUTHOR + * Darren Hart <dvhart@linux.intel.com> + * + * HISTORY + * 2009-Nov-9: Initial version by Darren Hart <dvhart@linux.intel.com> + * + *****************************************************************************/ + +#include <errno.h> +#include <getopt.h> +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include "futextest.h" +#include "logging.h" + +#define TEST_NAME "futex-requeue-pi-mismatched-ops" + +futex_t f1 = FUTEX_INITIALIZER; +futex_t f2 = FUTEX_INITIALIZER; +int child_ret = 0; + +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 *blocking_child(void *arg) +{ + child_ret = futex_wait(&f1, f1, NULL, FUTEX_PRIVATE_FLAG); + if (child_ret < 0) { + child_ret = -errno; + error("futex_wait\n", errno); + } + return (void *)&child_ret; +} + +int main(int argc, char *argv[]) +{ + int ret = RET_PASS; + pthread_t child; + int c; + + 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); + } + } + + ksft_print_header(); + ksft_set_plan(1); + ksft_print_msg("%s: Detect mismatched requeue_pi operations\n", + basename(argv[0])); + + if (pthread_create(&child, NULL, blocking_child, NULL)) { + error("pthread_create\n", errno); + ret = RET_ERROR; + goto out; + } + /* Allow the child to block in the kernel. */ + sleep(1); + + /* + * The kernel should detect the waiter did not setup the + * q->requeue_pi_key and return -EINVAL. If it does not, + * it likely gave the lock to the child, which is now hung + * in the kernel. + */ + ret = futex_cmp_requeue_pi(&f1, f1, &f2, 1, 0, FUTEX_PRIVATE_FLAG); + if (ret < 0) { + if (errno == EINVAL) { + /* + * The kernel correctly detected the mismatched + * requeue_pi target and aborted. Wake the child with + * FUTEX_WAKE. + */ + ret = futex_wake(&f1, 1, FUTEX_PRIVATE_FLAG); + if (ret == 1) { + ret = RET_PASS; + } else if (ret < 0) { + error("futex_wake\n", errno); + ret = RET_ERROR; + } else { + error("futex_wake did not wake the child\n", 0); + ret = RET_ERROR; + } + } else { + error("futex_cmp_requeue_pi\n", errno); + ret = RET_ERROR; + } + } else if (ret > 0) { + fail("futex_cmp_requeue_pi failed to detect the mismatch\n"); + ret = RET_FAIL; + } else { + error("futex_cmp_requeue_pi found no waiters\n", 0); + ret = RET_ERROR; + } + + pthread_join(child, NULL); + + if (!ret) + ret = child_ret; + + out: + /* If the kernel crashes, we shouldn't return at all. */ + print_result(TEST_NAME, ret); + return ret; +} |