linux-kernel - [PATCH v3 0/2] proc: Relax check of mount visibility

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Message-Id: <cover.1597931457.git.gladkov.alexey@gmail.com>
Date:   Thu, 20 Aug 2020 15:53:32 +0200
From:   Alexey Gladkov <gladkov.alexey@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>
Cc:     Alexey Gladkov <legion@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH v3 0/2] proc: Relax check of mount visibility

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
---------

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 (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(-)

-- 
2.25.4