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=-6.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 2FF77C2D0A3 for ; Fri, 6 Nov 2020 15:17:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DABB122203 for ; Fri, 6 Nov 2020 15:17:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727661AbgKFPP0 (ORCPT ); Fri, 6 Nov 2020 10:15:26 -0500 Received: from raptor.unsafe.ru ([5.9.43.93]:46012 "EHLO raptor.unsafe.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727182AbgKFPP0 (ORCPT ); Fri, 6 Nov 2020 10:15:26 -0500 Received: from comp-core-i7-2640m-0182e6.redhat.com (ip-89-103-122-167.net.upcbroadband.cz [89.103.122.167]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by raptor.unsafe.ru (Postfix) with ESMTPSA id 2F0FE209D4; Fri, 6 Nov 2020 15:15:21 +0000 (UTC) From: Alexey Gladkov To: LKML , Linux FS Devel , "Eric W . Biederman" Cc: Alexey Gladkov , Alexander Viro , Kees Cook Subject: [PATCH v4 0/3] proc: Relax check of mount visibility Date: Fri, 6 Nov 2020 16:15:09 +0100 Message-Id: X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.1 (raptor.unsafe.ru [5.9.43.93]); Fri, 06 Nov 2020 15:15:23 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If only the dynamic part of procfs is mounted (subset=pid), then there is no need to check if procfs is fully visible to the user in the new user namespace. Changelog --------- v4: * Set SB_I_DYNAMIC only if pidonly is set. * Add an error message if subset=pid is canceled during remount. v3: * Add 'const' to struct cred *mounter_cred (fix kernel test robot warning). v2: * cache the mounters credentials and make access to the net directories contingent of the permissions of the mounter of procfs. -- Alexey Gladkov (3): proc: Relax check of mount visibility proc: Show /proc/self/net only for CAP_NET_ADMIN proc: Disable cancellation of subset=pid option fs/namespace.c | 27 ++++++++++++++++----------- fs/proc/proc_net.c | 8 ++++++++ fs/proc/root.c | 29 ++++++++++++++++++++++------- include/linux/fs.h | 1 + include/linux/proc_fs.h | 1 + 5 files changed, 48 insertions(+), 18 deletions(-) -- 2.25.4