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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 5DFA7C2D0DB for ; Fri, 24 Jan 2020 11:39:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3263520708 for ; Fri, 24 Jan 2020 11:39:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579865980; bh=6TtykuFZrqLHKaZtkj3B2ER4gFI3EtL5V4YPruKL8aM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FWW9e0LMrrzWMUR9SqqJMKVzEA3iLiH7qMyX9WNeg1ALdWTSga1lgTbinRjvO6l84 Edt3HwYUqips509esnXuXQmZXJdnZ5hQct2wtS1y/JrrKfgdsc58UAuPyK2ZK/M7u9 w9Gb9z5+La/nIueG3PZIwNv9txC3bcrdlvzNmZVs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392019AbgAXLjj (ORCPT ); Fri, 24 Jan 2020 06:39:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:39746 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391507AbgAXLZg (ORCPT ); Fri, 24 Jan 2020 06:25:36 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (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 DA7D2206D4; Fri, 24 Jan 2020 11:25:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579865135; bh=6TtykuFZrqLHKaZtkj3B2ER4gFI3EtL5V4YPruKL8aM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1tSfVD1tWWSuyK+7Yfxyv7vGNHgMnm3/tl157G1FNuL4vy0R874PA8JuR+/LNDIXd sKg9yrl4Df8fh9ANepmGXynwLE/T5KMReyUUWv6UpJSzlXb8GhcRvnFMfuAfKO0J+o uhjqgE3t60T2sgx2gIVCpIYhicA9h63i+COIQFE0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ravi Bangoria , "Peter Zijlstra (Intel)" , 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 4.19 447/639] perf/ioctl: Add check for the sample_period value Date: Fri, 24 Jan 2020 10:30:17 +0100 Message-Id: <20200124093143.005390193@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@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 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 751888cbed5c0..16af86ab24c42 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5012,6 +5012,9 @@ 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