cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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futex_wait_wouldblock.c (2720B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/******************************************************************************
      3 *
      4 *   Copyright © International Business Machines  Corp., 2009
      5 *
      6 * DESCRIPTION
      7 *      Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs
      8 *      from the expected one.
      9 *
     10 * AUTHOR
     11 *      Gowrishankar <gowrishankar.m@in.ibm.com>
     12 *
     13 * HISTORY
     14 *      2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com>
     15 *
     16 *****************************************************************************/
     17
     18#include <errno.h>
     19#include <getopt.h>
     20#include <stdio.h>
     21#include <stdlib.h>
     22#include <string.h>
     23#include <time.h>
     24#include "futextest.h"
     25#include "futex2test.h"
     26#include "logging.h"
     27
     28#define TEST_NAME "futex-wait-wouldblock"
     29#define timeout_ns 100000
     30
     31void usage(char *prog)
     32{
     33	printf("Usage: %s\n", prog);
     34	printf("  -c	Use color\n");
     35	printf("  -h	Display this help message\n");
     36	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
     37	       VQUIET, VCRITICAL, VINFO);
     38}
     39
     40int main(int argc, char *argv[])
     41{
     42	struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
     43	futex_t f1 = FUTEX_INITIALIZER;
     44	int res, ret = RET_PASS;
     45	int c;
     46	struct futex_waitv waitv = {
     47			.uaddr = (uintptr_t)&f1,
     48			.val = f1+1,
     49			.flags = FUTEX_32,
     50			.__reserved = 0
     51		};
     52
     53	while ((c = getopt(argc, argv, "cht:v:")) != -1) {
     54		switch (c) {
     55		case 'c':
     56			log_color(1);
     57			break;
     58		case 'h':
     59			usage(basename(argv[0]));
     60			exit(0);
     61		case 'v':
     62			log_verbosity(atoi(optarg));
     63			break;
     64		default:
     65			usage(basename(argv[0]));
     66			exit(1);
     67		}
     68	}
     69
     70	ksft_print_header();
     71	ksft_set_plan(2);
     72	ksft_print_msg("%s: Test the unexpected futex value in FUTEX_WAIT\n",
     73	       basename(argv[0]));
     74
     75	info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
     76	res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);
     77	if (!res || errno != EWOULDBLOCK) {
     78		ksft_test_result_fail("futex_wait returned: %d %s\n",
     79				      res ? errno : res,
     80				      res ? strerror(errno) : "");
     81		ret = RET_FAIL;
     82	} else {
     83		ksft_test_result_pass("futex_wait\n");
     84	}
     85
     86	if (clock_gettime(CLOCK_MONOTONIC, &to)) {
     87		error("clock_gettime failed\n", errno);
     88		return errno;
     89	}
     90
     91	to.tv_nsec += timeout_ns;
     92
     93	if (to.tv_nsec >= 1000000000) {
     94		to.tv_sec++;
     95		to.tv_nsec -= 1000000000;
     96	}
     97
     98	info("Calling futex_waitv on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
     99	res = futex_waitv(&waitv, 1, 0, &to, CLOCK_MONOTONIC);
    100	if (!res || errno != EWOULDBLOCK) {
    101		ksft_test_result_pass("futex_waitv returned: %d %s\n",
    102				      res ? errno : res,
    103				      res ? strerror(errno) : "");
    104		ret = RET_FAIL;
    105	} else {
    106		ksft_test_result_pass("futex_waitv\n");
    107	}
    108
    109	ksft_print_cnts();
    110	return ret;
    111}