From patchwork Fri Jul 28 18:06:09 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepa Dinamani X-Patchwork-Id: 9869207 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7D28C60382 for ; Fri, 28 Jul 2017 18:08:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7DDB2288B8 for ; Fri, 28 Jul 2017 18:08:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 72D70288E6; Fri, 28 Jul 2017 18:08:35 +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=-6.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM autolearn=unavailable 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 10DCF288B8 for ; Fri, 28 Jul 2017 18:08:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752685AbdG1SIF (ORCPT ); Fri, 28 Jul 2017 14:08:05 -0400 Received: from mail-pg0-f65.google.com ([74.125.83.65]:35198 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752596AbdG1SHN (ORCPT ); Fri, 28 Jul 2017 14:07:13 -0400 Received: by mail-pg0-f65.google.com with SMTP id d193so24227820pgc.2; Fri, 28 Jul 2017 11:07:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=j+ljMCa9iopfcLGLm7E7PmfZ+y+9KHioKleN2IU4g5g=; b=KA/nscr7kZe8FyM1bw58MlSLDoHGjwmOZko77dQD7tvU06SiKRlrSBlxQMmHUUiSx/ V1dRrWADahnVpUTqDP1oHP23U5Ky3seh4uiIHJXZzka9GIl0ZgUPXTMm2f/DsEqX01fq f1vgQqlZOkj0/86F+m3IkpwFIMdwrBpuU2qr6lMyXo16Mg79hGZK3ZaF2pP1lMpOr+8H k6S3eHpZOPhgoCGg7wsJ0FqUjapQ0Byb4sWQeZk00igpyWmFbi6kvzVeOu4Jqrxf/IEj fXVqfEs/V0TVOqBeyE6NzfRDEO5tTug+cnjBmOKO7Yg1rLP+bXQQdLA7PEeKk4RrjfR7 veeQ== 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=j+ljMCa9iopfcLGLm7E7PmfZ+y+9KHioKleN2IU4g5g=; b=I/hayb9ePHJKv3tLlNiAEpnnYLHZ4TYfJCOTAA3A9SoKs1lJV1+wCdqWgJRZxZ9kW+ O0nkYQ4SsZ1B/shoMdpbNxys3URY3D7am1WAWf9ak9yjbIDxZCAagxapi0rWXGy+QrFV za9fNz9MdxPyt5JvXRyUoqo8O3NTHCXfmXLF0Glij7Tnkdw48Lp/0e/wrxBPc5pW2fef XVuv6A6/V6cOupk1VwE8RYdr91y64VnyHh+CSxe1Bfi5Lk5cPzrhkglJK+88KEI/7VuS IaEh0bBXuR82eOYUQMfLkjgCm4YT0iMCREoRW5TgG3i5CBhWiH4vi700EV/iU/yTOnml JRsg== X-Gm-Message-State: AIVw110VM7wU+iFT54fLQi88HyBfGnffzt7Fq/dPjRati0kmXRmnm5RU NZ1gM1ULbes2ag== X-Received: by 10.84.225.130 with SMTP id u2mr4333097plj.349.1501265233331; Fri, 28 Jul 2017 11:07:13 -0700 (PDT) Received: from localhost.localdomain ([2601:647:5000:6620:39fd:1b9c:c45:e526]) by smtp.gmail.com with ESMTPSA id e123sm38633162pfa.96.2017.07.28.11.07.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 28 Jul 2017 11:07:12 -0700 (PDT) From: Deepa Dinamani To: viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, arnd@arndb.de, y2038@lists.linaro.org Subject: [PATCH 4/6] ipc: sem: Make sem_array timestamps y2038 safe Date: Fri, 28 Jul 2017 11:06:09 -0700 Message-Id: <20170728180611.11249-5-deepa.kernel@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170728180611.11249-1-deepa.kernel@gmail.com> References: <20170728180611.11249-1-deepa.kernel@gmail.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP time_t is not y2038 safe. Replace all uses of time_t by y2038 safe time64_t. Similarly, replace the calls to get_seconds() with y2038 safe ktime_get_real_seconds(). Note that this preserves fast access on 64 bit systems, but 32 bit systems need sequence counters. The syscall interface themselves are not changed as part of the patch. They will be part of a different series. Signed-off-by: Deepa Dinamani --- include/linux/sem.h | 3 ++- ipc/sem.c | 22 +++++++++++----------- 2 files changed, 13 insertions(+), 12 deletions(-) diff --git a/include/linux/sem.h b/include/linux/sem.h index 9edec926e9d9..8012ce99f72f 100644 --- a/include/linux/sem.h +++ b/include/linux/sem.h @@ -4,6 +4,7 @@ #include #include #include +#include #include struct task_struct; @@ -11,7 +12,7 @@ struct task_struct; /* One sem_array data structure for each set of semaphores in the system. */ struct sem_array { struct kern_ipc_perm sem_perm; /* permissions .. see ipc.h */ - time_t sem_ctime; /* last change time */ + time64_t sem_ctime; /* last change time */ struct sem *sem_base; /* ptr to first semaphore in array */ struct list_head pending_alter; /* pending operations */ /* that alter the array */ diff --git a/ipc/sem.c b/ipc/sem.c index b41cd00d104c..b1ca22844b98 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -518,7 +518,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params) INIT_LIST_HEAD(&sma->pending_const); INIT_LIST_HEAD(&sma->list_id); sma->sem_nsems = nsems; - sma->sem_ctime = get_seconds(); + sma->sem_ctime = ktime_get_real_seconds(); id = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni); if (id < 0) { @@ -1169,14 +1169,14 @@ static unsigned long copy_semid_to_user(void __user *buf, struct semid64_ds *in, } } -static time_t get_semotime(struct sem_array *sma) +static time64_t get_semotime(struct sem_array *sma) { int i; - time_t res; + time64_t res; res = sma->sem_base[0].sem_otime; for (i = 1; i < sma->sem_nsems; i++) { - time_t to = sma->sem_base[i].sem_otime; + time64_t to = sma->sem_base[i].sem_otime; if (to > res) res = to; @@ -1316,7 +1316,7 @@ static int semctl_setval(struct ipc_namespace *ns, int semid, int semnum, curr->semval = val; curr->sempid = task_tgid_vnr(current); - sma->sem_ctime = get_seconds(); + sma->sem_ctime = ktime_get_real_seconds(); /* maybe some queued-up processes were waiting for this */ do_smart_update(sma, NULL, 0, 0, &wake_q); sem_unlock(sma, -1); @@ -1442,7 +1442,7 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum, for (i = 0; i < nsems; i++) un->semadj[i] = 0; } - sma->sem_ctime = get_seconds(); + sma->sem_ctime = ktime_get_real_seconds(); /* maybe some queued-up processes were waiting for this */ do_smart_update(sma, NULL, 0, 0, &wake_q); err = 0; @@ -1552,7 +1552,7 @@ static int semctl_down(struct ipc_namespace *ns, int semid, err = ipc_update_perm(&semid64->sem_perm, ipcp); if (err) goto out_unlock0; - sma->sem_ctime = get_seconds(); + sma->sem_ctime = ktime_get_real_seconds(); break; default: err = -EINVAL; @@ -2297,7 +2297,7 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it) { struct user_namespace *user_ns = seq_user_ns(s); struct sem_array *sma = it; - time_t sem_otime; + time64_t sem_otime; /* * The proc interface isn't aware of sem_lock(), it calls @@ -2310,7 +2310,7 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it) sem_otime = get_semotime(sma); seq_printf(s, - "%10d %10d %4o %10u %5u %5u %5u %5u %10lu %10lu\n", + "%10d %10d %4o %10u %5u %5u %5u %5u %10llu %10llu\n", sma->sem_perm.key, sma->sem_perm.id, sma->sem_perm.mode, @@ -2319,8 +2319,8 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it) from_kgid_munged(user_ns, sma->sem_perm.gid), from_kuid_munged(user_ns, sma->sem_perm.cuid), from_kgid_munged(user_ns, sma->sem_perm.cgid), - sem_otime, - sma->sem_ctime); + (unsigned long long) sem_otime, + (unsigned long long) sma->sem_ctime); complexmode_tryleave(sma);