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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 D9DB5C7659B for ; Thu, 27 Feb 2020 14:29:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A771224688 for ; Thu, 27 Feb 2020 14:29:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582813769; bh=XpnBttSLc8xUIzI/h+JjzrXocDxEK+hidNJfISLZMg4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jhgf1LIdro89fapeZVkxmPzCOtXgJyoINQLlUMbf9uYrQLfZmSPw+Bb6HgaQrxL/T A4BnvVLsdSy12wMO+tQVG7bDZiBmZH32MWadoRcvl+CweavAMbK3jLk/HMr0zodlRc KJJ8zPDz9g9zs7MGK+ZMzqmU9cRwea1JLeT5kh+M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387909AbgB0OGS (ORCPT ); Thu, 27 Feb 2020 09:06:18 -0500 Received: from mail.kernel.org ([198.145.29.99]:43294 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387514AbgB0OGN (ORCPT ); Thu, 27 Feb 2020 09:06:13 -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 7FBBB20578; Thu, 27 Feb 2020 14:06:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582812373; bh=XpnBttSLc8xUIzI/h+JjzrXocDxEK+hidNJfISLZMg4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K99QoxRyG8EzMDfJQGnrQTNYExx7/p/EK4vXSaOPcPUkW9dq+LG0DiWhs5ZsMwq7I aqw/fWf79h5v9QMmtHuhmEvWJDlW7ni3y+V6WKyrUpZS/i7ld/NIHUbOLaM9Ugv/eq hHxvODMblpf6vDFJxvay9lQT8ydyrEJJ8X4lJDYQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johannes Krude , Daniel Borkmann , Jakub Kicinski Subject: [PATCH 4.19 89/97] bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill Date: Thu, 27 Feb 2020 14:37:37 +0100 Message-Id: <20200227132229.139895694@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200227132214.553656188@linuxfoundation.org> References: <20200227132214.553656188@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: Johannes Krude commit e20d3a055a457a10a4c748ce5b7c2ed3173a1324 upstream. This if guards whether user-space wants a copy of the offload-jited bytecode and whether this bytecode exists. By erroneously doing a bitwise AND instead of a logical AND on user- and kernel-space buffer-size can lead to no data being copied to user-space especially when user-space size is a power of two and bigger then the kernel-space buffer. Fixes: fcfb126defda ("bpf: add new jited info fields in bpf_dev_offload and bpf_prog_info") Signed-off-by: Johannes Krude Signed-off-by: Daniel Borkmann Acked-by: Jakub Kicinski Link: https://lore.kernel.org/bpf/20200212193227.GA3769@phlox.h.transitiv.net Signed-off-by: Greg Kroah-Hartman --- kernel/bpf/offload.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/bpf/offload.c +++ b/kernel/bpf/offload.c @@ -289,7 +289,7 @@ int bpf_prog_offload_info_fill(struct bp ulen = info->jited_prog_len; info->jited_prog_len = aux->offload->jited_len; - if (info->jited_prog_len & ulen) { + if (info->jited_prog_len && ulen) { uinsns = u64_to_user_ptr(info->jited_prog_insns); ulen = min_t(u32, info->jited_prog_len, ulen); if (copy_to_user(uinsns, aux->offload->jited_image, ulen)) {