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=-14.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,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 E8515C169C4 for ; Mon, 11 Feb 2019 15:41:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B9843222A7 for ; Mon, 11 Feb 2019 15:41:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549899694; bh=IzNqNAjfOUGIHd6cKtgtjPvzvVoXj1AxCUJLb0ByEKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SS773hFxmwX+84McwtsJUpH2TkklVCi40gCqtUOi0Rk7+y/NO1JqA14EaC4gPT/Gz 99zwqxO2eUPoObuw9XXuB7h/bqfIyvFZ9pMzdXGXCz/nofg5H5wY9s1kWljKwJAtwh k8zXTnjtKSu+Q69EkElU7fJcOaGlRaQ3ILAjaATk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387565AbfBKOro (ORCPT ); Mon, 11 Feb 2019 09:47:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:32862 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733077AbfBKOro (ORCPT ); Mon, 11 Feb 2019 09:47:44 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 16F822081B; Mon, 11 Feb 2019 14:47:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549896463; bh=IzNqNAjfOUGIHd6cKtgtjPvzvVoXj1AxCUJLb0ByEKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EPK3Knty3n+K1a6CtIKxfSYGWBjr7M1RQNtCbzosHOFL7vYMnZt2ATnYihJO2vOct tMRTAYN9uCS1zg3r9dcnwx1Xe78NWHTvruJr8m1j341KblHSDWUQEhkmhR4qCzpYN9 3RsNITScMxjNynNiybxJiWQHn0pMDmQ43Jwv0Aco= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , Jiri Olsa , Masami Hiramatsu , Namhyung Kim , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 4.19 161/313] perf probe: Fix unchecked usage of strncpy() Date: Mon, 11 Feb 2019 15:17:21 +0100 Message-Id: <20190211141904.228339123@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141852.749630980@linuxfoundation.org> References: <20190211141852.749630980@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit bef0b8970f27da5ca223e522a174d03e2587761d ] The strncpy() function may leave the destination string buffer unterminated, better use strlcpy() that we have a __weak fallback implementation for systems without it. In this case the 'target' buffer is coming from a list of build-ids that are expected to have a len of at most (SBUILD_ID_SIZE - 1) chars, so probably we're safe, but since we're using strncpy() here, use strlcpy() instead to provide the intended safety checking without the using the problematic strncpy() function. This fixes this warning on an Alpine Linux Edge system with gcc 8.2: util/probe-file.c: In function 'probe_cache__open.isra.5': util/probe-file.c:427:3: error: 'strncpy' specified bound 41 equals destination size [-Werror=stringop-truncation] strncpy(sbuildid, target, SBUILD_ID_SIZE); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors Cc: Adrian Hunter Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Fixes: 1f3736c9c833 ("perf probe: Show all cached probes") Link: https://lkml.kernel.org/n/tip-l7n8ggc9kl38qtdlouke5yp5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/probe-file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index b76088fadf3d..6a6548890d5a 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -424,7 +424,7 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target, if (target && build_id_cache__cached(target)) { /* This is a cached buildid */ - strncpy(sbuildid, target, SBUILD_ID_SIZE); + strlcpy(sbuildid, target, SBUILD_ID_SIZE); dir_name = build_id_cache__linkname(sbuildid, NULL, 0); goto found; } -- 2.19.1