From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96316C28EBD for ; Sun, 9 Jun 2019 17:11:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B7F4205ED for ; Sun, 9 Jun 2019 17:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560100284; bh=bDqKyMfXVgcsYBF/9J7WMcrOgZDjwR1isac/Sf0O1+0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Fstq1Jner+181wQRnBIoBQg7t+7mT669rY2HDMWTDkm4AtQXMcWt68CpjdqLU4vyB n9SQFU+fq/7ZQJn70BpbABQtPOD8zpiEXxLsHSgpKMmWXknSbDePqlsgl+6EoYd++J lwIxN6gYmgN9bnezdQSYgG68QC63aeUjD5MvTTfc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388050AbfFIRBY (ORCPT ); Sun, 9 Jun 2019 13:01:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:38544 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730461AbfFIRBV (ORCPT ); Sun, 9 Jun 2019 13:01:21 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1D1FA206C3; Sun, 9 Jun 2019 17:01:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099680; bh=bDqKyMfXVgcsYBF/9J7WMcrOgZDjwR1isac/Sf0O1+0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g2m5wdjQwUq77d+IiRGV6rOqyFNQp1U8DwzVeU/oJ3LpWf29cViBZ7eVrvzU15bPT U5LBcqbRjycuLmqjxYwK8oZuXiJmZlm5RiYWkRy+J7WX7amRHE6bf6BFRWnYkJOC2J YU0nUC63jVk7kOlw/sd7Xb0JWj5dqNAbOMBVGWhw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Konstantin Khlebnikov , Peter Zijlstra , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.4 126/241] sched/core: Check quota and period overflow at usec to nsec conversion Date: Sun, 9 Jun 2019 18:41:08 +0200 Message-Id: <20190609164151.441155572@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164147.729157653@linuxfoundation.org> References: <20190609164147.729157653@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 1a8b4540db732ca16c9e43ac7c08b1b8f0b252d8 ] Large values could overflow u64 and pass following sanity checks. # echo 18446744073750000 > cpu.cfs_period_us # cat cpu.cfs_period_us 40448 # echo 18446744073750000 > cpu.cfs_quota_us # cat cpu.cfs_quota_us 40448 After this patch they will fail with -EINVAL. Signed-off-by: Konstantin Khlebnikov Acked-by: Peter Zijlstra Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/155125502079.293431.3947497929372138600.stgit@buzz Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/sched/core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d35a7d528ea66..1ef2fb4bbd6bd 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8460,8 +8460,10 @@ int tg_set_cfs_quota(struct task_group *tg, long cfs_quota_us) period = ktime_to_ns(tg->cfs_bandwidth.period); if (cfs_quota_us < 0) quota = RUNTIME_INF; - else + else if ((u64)cfs_quota_us <= U64_MAX / NSEC_PER_USEC) quota = (u64)cfs_quota_us * NSEC_PER_USEC; + else + return -EINVAL; return tg_set_cfs_bandwidth(tg, period, quota); } @@ -8483,6 +8485,9 @@ int tg_set_cfs_period(struct task_group *tg, long cfs_period_us) { u64 quota, period; + if ((u64)cfs_period_us > U64_MAX / NSEC_PER_USEC) + return -EINVAL; + period = (u64)cfs_period_us * NSEC_PER_USEC; quota = tg->cfs_bandwidth.quota; -- 2.20.1