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 1206FC2D0CE for ; Sun, 29 Dec 2019 18:10:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD4C420748 for ; Sun, 29 Dec 2019 18:10:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577643001; bh=bFNiQNRUnwf7NbQH8R9FB9j32/jBKVRVxDZM5wXzECI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nYjvHt/sfepKXtMVQWEOz88CToL1i/DG3viySKNgg33P4FE0J+yNsfrx8cbVS3AcE suo14qDibgJuh5UYE9FE7POHPjnEY5WH9vy+MQsv/dMWxmU5pT0xNl/XdSGIkyNMbU 0NbO4CSjEObhjgJwk4f1PkxdkMokGixcaqJ6/wEs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730255AbfL2SJ5 (ORCPT ); Sun, 29 Dec 2019 13:09:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:54136 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730858AbfL2RpO (ORCPT ); Sun, 29 Dec 2019 12:45:14 -0500 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 5C91D206DB; Sun, 29 Dec 2019 17:45:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577641513; bh=bFNiQNRUnwf7NbQH8R9FB9j32/jBKVRVxDZM5wXzECI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MMeU9ghB37hDMMzq+h2zIeCG2WO75taLM/6vZcJingPdEx0Y0PR+VZsmiEvMdMncl v4zj2iWd2Ilhxtz2MTqJwBYwBQdfDsYd3S9S161R7mH/GcXR0V27yheroYaPo0Dcc6 YftG9R14rf+LzI3FMtWao/1cYb6SCqPlRzlc7OZY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ivan Khoronzhuk , Daniel Borkmann , Song Liu , Sasha Levin Subject: [PATCH 5.4 096/434] selftests/bpf: Correct path to include msg + path Date: Sun, 29 Dec 2019 18:22:29 +0100 Message-Id: <20191229172707.955862688@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191229172702.393141737@linuxfoundation.org> References: <20191229172702.393141737@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Ivan Khoronzhuk [ Upstream commit c588146378962786ddeec817f7736a53298a7b01 ] The "path" buf is supposed to contain path + printf msg up to 24 bytes. It will be cut anyway, but compiler generates truncation warns like: " samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.c: In function ‘setup_cgroup_environment’: samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.c:52:34: warning: ‘/cgroup.controllers’ directive output may be truncated writing 19 bytes into a region of size between 1 and 4097 [-Wformat-truncation=] snprintf(path, sizeof(path), "%s/cgroup.controllers", cgroup_path); ^~~~~~~~~~~~~~~~~~~ samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.c:52:2: note: ‘snprintf’ output between 20 and 4116 bytes into a destination of size 4097 snprintf(path, sizeof(path), "%s/cgroup.controllers", cgroup_path); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.c:72:34: warning: ‘/cgroup.subtree_control’ directive output may be truncated writing 23 bytes into a region of size between 1 and 4097 [-Wformat-truncation=] snprintf(path, sizeof(path), "%s/cgroup.subtree_control", ^~~~~~~~~~~~~~~~~~~~~~~ cgroup_path); samples/bpf/../../tools/testing/selftests/bpf/cgroup_helpers.c:72:2: note: ‘snprintf’ output between 24 and 4120 bytes into a destination of size 4097 snprintf(path, sizeof(path), "%s/cgroup.subtree_control", cgroup_path); " In order to avoid warns, lets decrease buf size for cgroup workdir on 24 bytes with assumption to include also "/cgroup.subtree_control" to the address. The cut will never happen anyway. Signed-off-by: Ivan Khoronzhuk Signed-off-by: Daniel Borkmann Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20191002120404.26962-3-ivan.khoronzhuk@linaro.org Signed-off-by: Sasha Levin --- tools/testing/selftests/bpf/cgroup_helpers.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/cgroup_helpers.c b/tools/testing/selftests/bpf/cgroup_helpers.c index e95c33e333a4..b29a73fe64db 100644 --- a/tools/testing/selftests/bpf/cgroup_helpers.c +++ b/tools/testing/selftests/bpf/cgroup_helpers.c @@ -98,7 +98,7 @@ int enable_all_controllers(char *cgroup_path) */ int setup_cgroup_environment(void) { - char cgroup_workdir[PATH_MAX + 1]; + char cgroup_workdir[PATH_MAX - 24]; format_cgroup_path(cgroup_workdir, ""); -- 2.20.1