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,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 075BFC2BA12 for ; Wed, 1 Apr 2020 16:56:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE62F20714 for ; Wed, 1 Apr 2020 16:56:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585760192; bh=wBrE6gDlyZuwjMqIa3DxaNdN4BzjNwC4Wqm8ffpoJr4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ta2b4VfD/4xbDU12TH7+5y+gL3DIz/v6bV3QgMTlIP3+M+yJ7O1uEc/kdi6ZfmsYV eGbfzeaGkuxQdG4xL81+ijwCBwrn8jwRfMZkf+ZJFNXRsry2k+7v2Fu7qhhWU3GxQY NRNiXgjx9WKNvzjtSaw/1gx2hG1paqHMd5bnohzQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732677AbgDAQVp (ORCPT ); Wed, 1 Apr 2020 12:21:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:44606 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732355AbgDAQVm (ORCPT ); Wed, 1 Apr 2020 12:21:42 -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 B3ABB20857; Wed, 1 Apr 2020 16:21:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585758101; bh=wBrE6gDlyZuwjMqIa3DxaNdN4BzjNwC4Wqm8ffpoJr4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=khK8hUJRfKcRep1gnE3wMDhqRa0f8pg8i06/eKgRceMVox3vUISSJGX81TSzmSuOU lM03EyKc1NizEWw0YyQx6Uat0cgiQfUdjpLu3O7HsJP29Tb5qYpZ/qcaALviRcI9eJ hYtABCm3ekue3twv1SklZINS2jtrrzCKd1LiX7uE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Borkmann , Yonghong Song Subject: [PATCH 5.4 12/27] bpf: Explicitly memset some bpf info structures declared on the stack Date: Wed, 1 Apr 2020 18:17:40 +0200 Message-Id: <20200401161425.422896494@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200401161414.352722470@linuxfoundation.org> References: <20200401161414.352722470@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: Greg Kroah-Hartman commit 5c6f25887963f15492b604dd25cb149c501bbabf upstream. Trying to initialize a structure with "= {};" will not always clean out all padding locations in a structure. So be explicit and call memset to initialize everything for a number of bpf information structures that are then copied from userspace, sometimes from smaller memory locations than the size of the structure. Reported-by: Daniel Borkmann Signed-off-by: Greg Kroah-Hartman Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20200320162258.GA794295@kroah.com Signed-off-by: Greg Kroah-Hartman --- kernel/bpf/btf.c | 3 ++- kernel/bpf/syscall.c | 6 ++++-- 2 files changed, 6 insertions(+), 3 deletions(-) --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3460,7 +3460,7 @@ int btf_get_info_by_fd(const struct btf union bpf_attr __user *uattr) { struct bpf_btf_info __user *uinfo; - struct bpf_btf_info info = {}; + struct bpf_btf_info info; u32 info_copy, btf_copy; void __user *ubtf; u32 uinfo_len; @@ -3469,6 +3469,7 @@ int btf_get_info_by_fd(const struct btf uinfo_len = attr->info.info_len; info_copy = min_t(u32, uinfo_len, sizeof(info)); + memset(&info, 0, sizeof(info)); if (copy_from_user(&info, uinfo, info_copy)) return -EFAULT; --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -2325,7 +2325,7 @@ static int bpf_prog_get_info_by_fd(struc union bpf_attr __user *uattr) { struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); - struct bpf_prog_info info = {}; + struct bpf_prog_info info; u32 info_len = attr->info.info_len; struct bpf_prog_stats stats; char __user *uinsns; @@ -2337,6 +2337,7 @@ static int bpf_prog_get_info_by_fd(struc return err; info_len = min_t(u32, sizeof(info), info_len); + memset(&info, 0, sizeof(info)); if (copy_from_user(&info, uinfo, info_len)) return -EFAULT; @@ -2600,7 +2601,7 @@ static int bpf_map_get_info_by_fd(struct union bpf_attr __user *uattr) { struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); - struct bpf_map_info info = {}; + struct bpf_map_info info; u32 info_len = attr->info.info_len; int err; @@ -2609,6 +2610,7 @@ static int bpf_map_get_info_by_fd(struct return err; info_len = min_t(u32, sizeof(info), info_len); + memset(&info, 0, sizeof(info)); info.type = map->map_type; info.id = map->id; info.key_size = map->key_size;