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From: Alexey Gladkov <gladkov.alexey@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>,
	Linux FS Devel <linux-fsdevel@vger.kernel.org>,
	"Eric W . Biederman" <ebiederm@xmission.com>
Cc: Alexey Gladkov <legion@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Kees Cook <keescook@chromium.org>
Subject: [PATCH v3 0/2] proc: Relax check of mount visibility
Date: Thu, 20 Aug 2020 15:53:32 +0200	[thread overview]
Message-ID: <cover.1597931457.git.gladkov.alexey@gmail.com> (raw)

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


             reply	other threads:[~2020-08-20 13:56 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-20 13:53 Alexey Gladkov [this message]
2020-08-20 13:53 ` [PATCH v3 1/2] " Alexey Gladkov
2020-08-20 13:53 ` [PATCH v3 2/2] Show /proc/self/net only for CAP_NET_ADMIN Alexey Gladkov

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