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,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 AED40C742BB for ; Fri, 12 Jul 2019 12:21:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 89494216C4 for ; Fri, 12 Jul 2019 12:21:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934112; bh=Og0B92RChDsexTGGF7iAM2MlgY+ABlNAMFN0aun9bEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ExW5yLhxvFE5/b91d7BSD2Mx6WZQgYTBHCqxJ8MPzC0rdFr721CuMgeC/p5K2ebSp pUduAj7bmKs4LFU0nrFPktSHGI7lO1mmPt1wUTPKS/Rb0BEtHu6KHNM1anzr3YSjEz Bu5tsK39+6HRpxl6fLiE5UjGEmLmvLH7bmIh9MaY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727675AbfGLMVv (ORCPT ); Fri, 12 Jul 2019 08:21:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:56194 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727656AbfGLMVr (ORCPT ); Fri, 12 Jul 2019 08:21:47 -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 518232166E; Fri, 12 Jul 2019 12:21:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934106; bh=Og0B92RChDsexTGGF7iAM2MlgY+ABlNAMFN0aun9bEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bo78s/iM2p096FyIlCHXNKvpRQNuPm3e+asVk1wekCbVo6DUuJpENhQbkjUlW6ABt p1UmXn1aGiwechV2WoZwXyxzMbEkZyHkpKnSG95lLm6w7u4u3Rb+Cv3ARLZWd0DUpT sZXVToaySA7knzl99IMygCyqzD9VK+EyMf4gkJLY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Matteo Croce , Daniel Borkmann , Sasha Levin Subject: [PATCH 4.19 07/91] samples, bpf: suppress compiler warning Date: Fri, 12 Jul 2019 14:18:10 +0200 Message-Id: <20190712121621.812244165@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190712121621.422224300@linuxfoundation.org> References: <20190712121621.422224300@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 [ Upstream commit a195cefff49f60054998333e81ee95170ce8bf92 ] GCC 9 fails to calculate the size of local constant strings and produces a false positive: samples/bpf/task_fd_query_user.c: In function ‘test_debug_fs_uprobe’: samples/bpf/task_fd_query_user.c:242:67: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 215 [-Wformat-truncation=] 242 | snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id", | ^~ 243 | event_type, event_alias); | ~~~~~~~~~~~ samples/bpf/task_fd_query_user.c:242:2: note: ‘snprintf’ output between 45 and 300 bytes into a destination of size 256 242 | snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 243 | event_type, event_alias); | ~~~~~~~~~~~~~~~~~~~~~~~~ Workaround this by lowering the buffer size to a reasonable value. Related GCC Bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83431 Signed-off-by: Matteo Croce Signed-off-by: Daniel Borkmann Signed-off-by: Sasha Levin --- samples/bpf/task_fd_query_user.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/samples/bpf/task_fd_query_user.c b/samples/bpf/task_fd_query_user.c index 8381d792f138..06957f0fbe83 100644 --- a/samples/bpf/task_fd_query_user.c +++ b/samples/bpf/task_fd_query_user.c @@ -216,7 +216,7 @@ static int test_debug_fs_uprobe(char *binary_path, long offset, bool is_return) { const char *event_type = "uprobe"; struct perf_event_attr attr = {}; - char buf[256], event_alias[256]; + char buf[256], event_alias[sizeof("test_1234567890")]; __u64 probe_offset, probe_addr; __u32 len, prog_id, fd_type; int err, res, kfd, efd; -- 2.20.1