From patchwork Wed Sep 19 20:50:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 10606547 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 93C271508 for ; Wed, 19 Sep 2018 20:51:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7FBFA2CC48 for ; Wed, 19 Sep 2018 20:51:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7D9342CC4D; Wed, 19 Sep 2018 20:51:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E7A682CC4A for ; Wed, 19 Sep 2018 20:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733156AbeITCau (ORCPT ); Wed, 19 Sep 2018 22:30:50 -0400 Received: from mail-ed1-f65.google.com ([209.85.208.65]:42333 "EHLO mail-ed1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733105AbeITCat (ORCPT ); Wed, 19 Sep 2018 22:30:49 -0400 Received: by mail-ed1-f65.google.com with SMTP id l5so6024738edw.9 for ; Wed, 19 Sep 2018 13:51:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=googlenew; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=VopBSEwitIpT7IZdHiVx92lBu5moRZLzTfTwrrJI6+8=; b=e93Uq9IBYm9NN9aZ/ySLPhC2Ht1aroFGRJ1X2C8xsIrnDQdJS6tDzv2e2x7WU4eTht WEA5swLJ6fxfWANc2AeZmWAzNHjSGkfoYCl2GSuhbYF6eSTswetxDgWxl7hn4U4r3krp vIYEY5Fffv3nWTydhA+lDxx/R5CcZsE/xbL/x0iAuD1hl+FCq5RfJlwAdd3389lR6OW9 CFmOLRkB9mYl1ATk7vDiGMC5AVP7Cu/Dr2X7QgGi5HL5JB7kJ3IwBS7ehP3a2Jcjam7z UbFIOpcZauNzPa7heN3rfmX5V9UR7JjG0Yc+BaBhyJLjJRCtx86d+ghcPET5f3XeGzg+ nJXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=VopBSEwitIpT7IZdHiVx92lBu5moRZLzTfTwrrJI6+8=; b=sLdK35U0GXq09WpYvtZihS0tECUC77JmbC6QsSzWVfF2LhpCr6sUcFTFaHNMAOSBnk je7yAQ/B4W/Nxy2vRnvBoG/n80QZ0R9nA6gjkopC/jnGospIwtrNB/BYDhPJ3Nz5VQTf zdDIkP8QYe3vZvN3DcAiPymnVDjTXmVwO16z6kryx0+MBbQ+Nl9coeMBrKGtatTNw04f yu1zhe2FEOlBTccfLAsV6+WZAX3FKRGZsgxL2570MiKK9GPpzW9PKOuI8mTfkPVPXj8d 7uYlhj1xOAM4Km+bhVQrWvkEUdqYoxK5R+/ZffE09qQ2Ot1cDj5S5r9F9cruG8412EVd baKQ== X-Gm-Message-State: APzg51AGSYTGAu3sIyDiVym5vdAiN11K/ay4Hj8v+tsP+bCilCD2lMQR IxPQoanHumtQXdQejOVKDct03A== X-Google-Smtp-Source: ANB0VdYF7Lyopp8bBaKHYeCJR6ZzchHHzBtLj9aNnEVctM+qZ2vHaBkri0znS/328tWNpyIjqS9n7Q== X-Received: by 2002:a50:b702:: with SMTP id g2-v6mr61136789ede.139.1537390268127; Wed, 19 Sep 2018 13:51:08 -0700 (PDT) Received: from dhcp.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id t17-v6sm1747729edb.27.2018.09.19.13.51.06 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 19 Sep 2018 13:51:07 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org Cc: Dmitry Safonov <0x7f454c46@gmail.com>, Dmitry Safonov , Adrian Reber , Andrei Vagin , Andy Lutomirski , Christian Brauner , Cyrill Gorcunov , "Eric W. Biederman" , "H. Peter Anvin" , Ingo Molnar , Jeff Dike , Oleg Nesterov , Pavel Emelyanov , Shuah Khan , Thomas Gleixner , containers@lists.linux-foundation.org, criu@openvz.org, linux-api@vger.kernel.org, x86@kernel.org, linux-kselftest@vger.kernel.org Subject: [RFC 19/20] timens/selftest: Add procfs selftest Date: Wed, 19 Sep 2018 21:50:36 +0100 Message-Id: <20180919205037.9574-20-dima@arista.com> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20180919205037.9574-1-dima@arista.com> References: <20180919205037.9574-1-dima@arista.com> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently only uptime check, but procfs checks for REALTIME might be added in future. Cc: linux-kselftest@vger.kernel.org Signed-off-by: Dmitry Safonov --- tools/testing/selftests/timens/.gitignore | 1 + tools/testing/selftests/timens/Makefile | 2 +- tools/testing/selftests/timens/procfs.c | 145 ++++++++++++++++++++++++++++++ 3 files changed, 147 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/timens/procfs.c diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore index 9b6c8ddac2c8..94ffdd9cead7 100644 --- a/tools/testing/selftests/timens/.gitignore +++ b/tools/testing/selftests/timens/.gitignore @@ -1,3 +1,4 @@ clock_nanosleep +procfs timens timerfd diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile index 76a1dc891184..f96f50d1fef8 100644 --- a/tools/testing/selftests/timens/Makefile +++ b/tools/testing/selftests/timens/Makefile @@ -1,4 +1,4 @@ -TEST_GEN_PROGS := timens timerfd clock_nanosleep +TEST_GEN_PROGS := timens timerfd clock_nanosleep procfs CFLAGS := -Wall -Werror diff --git a/tools/testing/selftests/timens/procfs.c b/tools/testing/selftests/timens/procfs.c new file mode 100644 index 000000000000..5067cbbddcc5 --- /dev/null +++ b/tools/testing/selftests/timens/procfs.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "log.h" + +#ifndef CLONE_NEWTIME +# define CLONE_NEWTIME 0x00001000 +#endif + +/* + * Test shouldn't be run for a day, so add 10 days to child + * time and check parent's time to be in the same day. + */ +#define MAX_TEST_TIME_SEC (60*5) +#define DAY_IN_SEC (60*60*24) +#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC) + +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) + +static int child_ns, parent_ns; + +static int switch_ns(int fd) +{ + if (setns(fd, CLONE_NEWTIME)) + return pr_perror("setns()"); + + return 0; +} + +static int init_namespaces(void) +{ + char path[] = "/proc/self/ns/time"; + struct stat st1, st2; + + parent_ns = open(path, O_RDONLY); + if (parent_ns <= 0) + return pr_perror("Unable to open %s", path); + + if (fstat(parent_ns, &st1)) + return pr_perror("Unable to stat the parent timens"); + + if (unshare(CLONE_NEWTIME)) + return pr_perror("Can't unshare() timens"); + + child_ns = open(path, O_RDONLY); + if (child_ns <= 0) + return pr_perror("Unable to open %s", path); + + if (fstat(child_ns, &st2)) + return pr_perror("Unable to stat the timens"); + + if (st1.st_ino == st2.st_ino) + return pr_err("The same child_ns after CLONE_NEWTIME"); + + return 0; +} + +static int read_proc_uptime(struct timespec *uptime) +{ + unsigned long up_sec, up_nsec; + FILE *proc; + + proc = fopen("/proc/uptime", "r"); + if (proc == NULL) { + pr_perror("Unable to open /proc/uptime"); + return -1; + } + + if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) { + if (errno) { + pr_perror("fscanf"); + return -errno; + } + pr_err("failed to parse /proc/uptime"); + return -1; + } + fclose(proc); + + uptime->tv_sec = up_sec; + uptime->tv_nsec = up_nsec; + return 0; +} + +static int check_uptime(void) +{ + struct timespec ts_btime, uptime_new, uptime_old; + time_t uptime_expected; + double prec = MAX_TEST_TIME_SEC; + + if (switch_ns(parent_ns)) + return pr_err("switch_ns(%d)", parent_ns); + + if (clock_gettime(CLOCK_BOOTTIME, &ts_btime)) + return pr_perror("clock_gettime()"); + + if (read_proc_uptime(&uptime_old)) + return 1; + + ts_btime.tv_sec += TEN_DAYS_IN_SEC; + + if (switch_ns(child_ns)) + return pr_err("switch_ns(%d)", child_ns); + + if (clock_settime(CLOCK_BOOTTIME, &ts_btime)) + return pr_perror("clock_settime()"); + + if (read_proc_uptime(&uptime_new)) + return 1; + + uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC; + if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) { + pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]", + uptime_old.tv_sec, uptime_new.tv_sec, + uptime_old.tv_sec + TEN_DAYS_IN_SEC); + return 1; + } + + pr_msg("Passed for /proc/uptime", "OK"); + return 0; +} + +int main(int argc, char *argv[]) +{ + int ret = 0; + + if (init_namespaces()) + return 1; + + ret |= check_uptime(); + + return ret; +}