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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 3B50EC072B1 for ; Thu, 30 May 2019 03:54:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0BE2724E52 for ; Thu, 30 May 2019 03:54:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559188486; bh=27AnvQp6V1UBvA8YUZr5d1qzCcobTE+49gHKQuYrNho=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yErRFqNfBLwB2MxM1rUL9U5PWRarxjHFNtQgSjN1exh5UmoyMQXChp56ZaweHMTxd fxNl//Ckwq8EnNB/Vw4vFRzsJnrak7hxGoQiKXihwvPEhbKWFWaP/ECKgh7l/oVu7i A9NjhhtNNJLBvRDsR02s1rFuzijhBnMTTR3mv3M0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727196AbfE3Dyg (ORCPT ); Wed, 29 May 2019 23:54:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:54624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731857AbfE3DTS (ORCPT ); Wed, 29 May 2019 23:19:18 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (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 AA02424849; Thu, 30 May 2019 03:19:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186357; bh=27AnvQp6V1UBvA8YUZr5d1qzCcobTE+49gHKQuYrNho=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X9nqEoAGNFATa2OcGFF+HQCe+235D/PgGdtQ/CzZ8mQgUt6cLEtfo0ostAGMcLCr6 HBT058KCY3jG6RoKJmpRfHY2HOg8c00UeBPFgC99jXY5nuA+TkoAEY2Ps0jWN9IZDt NOhQUHqiWWTr3Gt6VoJ2dNRtB88UAtjR12GH++hs= 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 4.14 101/193] sched/rt: Check integer overflow at usec to nsec conversion Date: Wed, 29 May 2019 20:05:55 -0700 Message-Id: <20190530030502.959142662@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030446.953835040@linuxfoundation.org> References: <20190530030446.953835040@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 1a010e29cfa00fee2888fd2fd4983f848cbafb58 ] Example of unhandled overflows: # echo 18446744073709651 > cpu.rt_runtime_us # cat cpu.rt_runtime_us 99 # echo 18446744073709900 > cpu.rt_period_us # cat cpu.rt_period_us 348 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/155125501739.293431.5252197504404771496.stgit@buzz Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/sched/rt.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index cb9a5b8532fa5..cc7dd1aaf08e3 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -2533,6 +2533,8 @@ int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us) rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC; if (rt_runtime_us < 0) rt_runtime = RUNTIME_INF; + else if ((u64)rt_runtime_us > U64_MAX / NSEC_PER_USEC) + return -EINVAL; return tg_set_rt_bandwidth(tg, rt_period, rt_runtime); } @@ -2553,6 +2555,9 @@ int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us) { u64 rt_runtime, rt_period; + if (rt_period_us > U64_MAX / NSEC_PER_USEC) + return -EINVAL; + rt_period = rt_period_us * NSEC_PER_USEC; rt_runtime = tg->rt_bandwidth.rt_runtime; -- 2.20.1