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=-15.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,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 C0151C04EB8 for ; Thu, 6 Dec 2018 21:30:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 879C5208E7 for ; Thu, 6 Dec 2018 21:30:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544131839; bh=mxOhawql5382bmYt7BlG7CEnDt119yXXUdXlZIxkQKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qse2x2e/qF9nmLnX5sP9hgOR1SPp7w9waShMB5O0snIIi9D4BDXnqJj5DqbbLH2SQ 289z9VJBZW1oBVtWdJ90CPF2EfH7mZK4EFvSEkI/sWrNYqNPQQ6eU6HCVAInsFJRIF mS74tIdNdak9IMBChofC/N6z4ngYVsx+Nkh93e9o= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 879C5208E7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726760AbeLFVai (ORCPT ); Thu, 6 Dec 2018 16:30:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:48954 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726401AbeLFVae (ORCPT ); Thu, 6 Dec 2018 16:30:34 -0500 Received: from quaco.ghostprotocols.net (179.187.13.223.dynamic.adsl.gvt.net.br [179.187.13.223]) (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 763E92082B; Thu, 6 Dec 2018 21:30:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544131834; bh=mxOhawql5382bmYt7BlG7CEnDt119yXXUdXlZIxkQKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LXKGAk43sXooFzKxjKnlSoH7XHYuw4yFpSgZcx2tKco6eKSRxssOF7auIuIDlTnrX qPADXbtPsST9Y1z8NXuUNZx0C3+m+u0B3wg04SM+idVbDCxSNZcMwozXAig0OQBnJ5 5WX0AYYr49S4DvYi3OaGNrJMcAHnGl24Wyziov+M= From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , Adrian Hunter , Jiri Olsa , Namhyung Kim Subject: [PATCH 62/75] perf header: Fix unchecked usage of strncpy() Date: Thu, 6 Dec 2018 18:25:49 -0300 Message-Id: <20181206212602.20474-63-acme@kernel.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181206212602.20474-1-acme@kernel.org> References: <20181206212602.20474-1-acme@kernel.org> MIME-Version: 1.0 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 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 --- tools/perf/util/header.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index c87cfe6b7c96..1171d8400bf4 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -3622,7 +3622,7 @@ perf_event__synthesize_event_update_name(struct perf_tool *tool, 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; -- 2.19.2