From patchwork Wed Aug 19 19:14:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Gladkov X-Patchwork-Id: 11724967 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AD3CB618 for ; Wed, 19 Aug 2020 19:15:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D2D5207DA for ; Wed, 19 Aug 2020 19:15:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726646AbgHSTPE (ORCPT ); Wed, 19 Aug 2020 15:15:04 -0400 Received: from raptor.unsafe.ru ([5.9.43.93]:48526 "EHLO raptor.unsafe.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726211AbgHSTPE (ORCPT ); Wed, 19 Aug 2020 15:15:04 -0400 Received: from comp-core-i7-2640m-0182e6.redhat.com (ip-89-102-33-211.net.upcbroadband.cz [89.102.33.211]) (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 446D4203BD; Wed, 19 Aug 2020 19:15:00 +0000 (UTC) From: Alexey Gladkov To: LKML , Linux FS Devel , "Eric W . Biederman" Cc: Alexey Gladkov , Alexander Viro , Kees Cook Subject: [PATCH v2 0/2] proc: Relax check of mount visibility Date: Wed, 19 Aug 2020 21:14:48 +0200 Message-Id: <20200819191450.2550994-1-gladkov.alexey@gmail.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.1 (raptor.unsafe.ru [5.9.43.93]); Wed, 19 Aug 2020 19:15:01 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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. Alexey Gladkov (2): proc: Relax check of mount visibility Show /proc/self/net only for CAP_NET_ADMIN fs/namespace.c | 27 ++++++++++++++++----------- fs/proc/proc_net.c | 8 ++++++++ fs/proc/root.c | 21 +++++++++++++++------ include/linux/fs.h | 1 + include/linux/proc_fs.h | 1 + 5 files changed, 41 insertions(+), 17 deletions(-)