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=-12.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 08F63C43381 for ; Tue, 19 Mar 2019 11:12:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D63BB2147C for ; Tue, 19 Mar 2019 11:12:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727644AbfCSLMC (ORCPT ); Tue, 19 Mar 2019 07:12:02 -0400 Received: from terminus.zytor.com ([198.137.202.136]:47457 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726504AbfCSLMB (ORCPT ); Tue, 19 Mar 2019 07:12:01 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id x2JBBef63395639 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Tue, 19 Mar 2019 04:11:40 -0700 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id x2JBBbmH3395636; Tue, 19 Mar 2019 04:11:37 -0700 Date: Tue, 19 Mar 2019 04:11:37 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Konstantin Khlebnikov Message-ID: Cc: torvalds@linux-foundation.org, riel@surriel.com, lizefan@huawei.com, hpa@zytor.com, khlebnikov@yandex-team.ru, tj@kernel.org, bp@alien8.de, tglx@linutronix.de, peterz@infradead.org, linux-kernel@vger.kernel.org, mingo@kernel.org, hannes@cmpxchg.org, dave.hansen@linux.intel.com, luto@kernel.org Reply-To: bp@alien8.de, tglx@linutronix.de, peterz@infradead.org, torvalds@linux-foundation.org, lizefan@huawei.com, riel@surriel.com, hpa@zytor.com, khlebnikov@yandex-team.ru, tj@kernel.org, hannes@cmpxchg.org, dave.hansen@linux.intel.com, luto@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org In-Reply-To: <155189230232.2620.13120481613524200065.stgit@buzz> References: <155189230232.2620.13120481613524200065.stgit@buzz> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/urgent] sched/core: Fix buffer overflow in cgroup2 property cpu.max Git-Commit-ID: 4c47acd824aaaa8fc6dc519fb4e08d1522105b7a X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 4c47acd824aaaa8fc6dc519fb4e08d1522105b7a Gitweb: https://git.kernel.org/tip/4c47acd824aaaa8fc6dc519fb4e08d1522105b7a Author: Konstantin Khlebnikov AuthorDate: Wed, 6 Mar 2019 20:11:42 +0300 Committer: Ingo Molnar CommitDate: Tue, 19 Mar 2019 12:06:15 +0100 sched/core: Fix buffer overflow in cgroup2 property cpu.max Add limit into sscanf format string for on-stack buffer. Signed-off-by: Konstantin Khlebnikov Signed-off-by: Peter Zijlstra (Intel) Acked-by: Tejun Heo Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: H. Peter Anvin Cc: Johannes Weiner Cc: Li Zefan Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Fixes: 0d5936344f30 ("sched: Implement interface for cgroup unified hierarchy") Link: https://lkml.kernel.org/r/155189230232.2620.13120481613524200065.stgit@buzz Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 6b2c055564b5..b7a4afdc33cb 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6943,7 +6943,7 @@ static int __maybe_unused cpu_period_quota_parse(char *buf, { char tok[21]; /* U64_MAX */ - if (!sscanf(buf, "%s %llu", tok, periodp)) + if (sscanf(buf, "%20s %llu", tok, periodp) < 1) return -EINVAL; *periodp *= NSEC_PER_USEC;