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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 DCF0BC3F68F for ; Thu, 16 Jan 2020 18:20:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BB1EA22522 for ; Thu, 16 Jan 2020 18:20:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579198827; bh=zDmAv00pLBpCK3oOKcu1kLjwu4+32XeL2PEu0RL/y2w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=E6NBqQSBXzL766eEb79tNp3spBrVbbDt4Eio5OwynM9m852Jz4k+I7XjtZR2HpQnZ ziTvaG/Dljxah+uMQ7mcE+eymVljjdd0UtXBjDjMgA1ZpVX77eKxxTkzx9IXYfpitI Xi+JpCYsocDmo+au6UjtqRcNQt84A0ZzVusYg5fc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404113AbgAPR2I (ORCPT ); Thu, 16 Jan 2020 12:28:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:38698 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404085AbgAPR2F (ORCPT ); Thu, 16 Jan 2020 12:28:05 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A484B246E4; Thu, 16 Jan 2020 17:28:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579195684; bh=zDmAv00pLBpCK3oOKcu1kLjwu4+32XeL2PEu0RL/y2w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aLW1yrpiyQ+n8llfLfArmobKK0kw/sJF+BONgRjqozM23wxppEfIrYkeko9doYitg gaQUMYp2mKFN97H11nlG0Yz78+MTtfnt9PsP+xmPb7f03dnkSz5aJB/CemmVAP8kke KUbFHgkeGivY9sT13g6p6XCTQL7lGQUWSLrQbTEk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ravi Bangoria , Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Stephane Eranian , Thomas Gleixner , Vince Weaver , acme@kernel.org, linuxppc-dev@lists.ozlabs.org, maddy@linux.vnet.ibm.com, mpe@ellerman.id.au, Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL 4.14 237/371] perf/ioctl: Add check for the sample_period value Date: Thu, 16 Jan 2020 12:21:49 -0500 Message-Id: <20200116172403.18149-180-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200116172403.18149-1-sashal@kernel.org> References: <20200116172403.18149-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ravi Bangoria [ Upstream commit 913a90bc5a3a06b1f04c337320e9aeee2328dd77 ] perf_event_open() limits the sample_period to 63 bits. See: 0819b2e30ccb ("perf: Limit perf_event_attr::sample_period to 63 bits") Make ioctl() consistent with it. Also on PowerPC, negative sample_period could cause a recursive PMIs leading to a hang (reported when running perf-fuzzer). Signed-off-by: Ravi Bangoria Signed-off-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Cc: acme@kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: maddy@linux.vnet.ibm.com Cc: mpe@ellerman.id.au Fixes: 0819b2e30ccb ("perf: Limit perf_event_attr::sample_period to 63 bits") Link: https://lkml.kernel.org/r/20190604042953.914-1-ravi.bangoria@linux.ibm.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/events/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index ea4f3f7a0c6f..2ac73b4cb8a9 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4762,6 +4762,9 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg) if (perf_event_check_period(event, value)) return -EINVAL; + if (!event->attr.freq && (value & (1ULL << 63))) + return -EINVAL; + event_function_call(event, __perf_event_period, &value); return 0; -- 2.20.1