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=-11.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 8C064C606C1 for ; Mon, 8 Jul 2019 15:20:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FB4A216C4 for ; Mon, 8 Jul 2019 15:20:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562599221; bh=Zs8cdzwW/322Rt7NUIextUwtakxIBwPqzOFo9x9q7OI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pN0uMJ4heSW7xBOwkniXgnpjiUWSIpv4BjDQBqhDC3g+u3Yd6jiLzS45S0ntyf4Xw O7522avxd5OhHZFVcQN7oYpTuhVyEnb4xoIPIV0ShaXiRSITmVA9RnU+P7pqmvDCql DBDFDJBqxjiDZF3JeW5V+Bxym+J1yh0BClYr77gk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727667AbfGHPUT (ORCPT ); Mon, 8 Jul 2019 11:20:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:44934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726491AbfGHPUQ (ORCPT ); Mon, 8 Jul 2019 11:20:16 -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 E6BCE21537; Mon, 8 Jul 2019 15:20:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562599213; bh=Zs8cdzwW/322Rt7NUIextUwtakxIBwPqzOFo9x9q7OI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vpw0+SWBVJWAV9D6FrJlIpfNo2EwBwrNwpPuLhB/LYTcT3tygy9KvL3rVyeE2f+3o L2nhKkcg0D+WKwxdpmfIXHVh/ft9BE7f4CvcNubpye8Faaq5t81ztHkSpSVoWzeeXC h2+hJ8Hlib8RjecVawY7yH4Nv/MqVULy28IAnbbA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , Jiri Olsa , Namhyung Kim , Arnaldo Carvalho de Melo Subject: [PATCH 4.9 039/102] perf header: Fix unchecked usage of strncpy() Date: Mon, 8 Jul 2019 17:12:32 +0200 Message-Id: <20190708150528.431360994@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190708150525.973820964@linuxfoundation.org> References: <20190708150525.973820964@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: Arnaldo Carvalho de Melo commit 5192bde7d98c99f2cd80225649e3c2e7493722f7 upstream. The strncpy() function may leave the destination string buffer unterminated, better use strlcpy() that we have a __weak fallback implementation for systems without it. This fixes this warning on an Alpine Linux Edge system with gcc 8.2: util/header.c: In function 'perf_event__synthesize_event_update_name': util/header.c:3625:2: error: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Werror=stringop-truncation] strncpy(ev->data, evsel->name, len); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ util/header.c:3618:15: note: length computed here size_t len = strlen(evsel->name); ^~~~~~~~~~~~~~~~~~~ Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Fixes: a6e5281780d1 ("perf tools: Add event_update event unit type") Link: https://lkml.kernel.org/n/tip-wycz66iy8dl2z3yifgqf894p@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman --- tools/perf/util/header.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -3027,7 +3027,7 @@ perf_event__synthesize_event_update_name if (ev == NULL) return -ENOMEM; - strncpy(ev->data, evsel->name, len); + strlcpy(ev->data, evsel->name, len + 1); err = process(tool, (union perf_event*) ev, NULL, NULL); free(ev); return err;