From: Alexey Gladkov <gladkov.alexey@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>,
"Eric W . Biederman" <ebiederm@xmission.com>
Cc: Linux FS Devel <linux-fsdevel@vger.kernel.org>,
Linux Containers <containers@lists.linux-foundation.org>,
Alexey Gladkov <legion@kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Kees Cook <keescook@chromium.org>
Subject: [PATCH v5 0/5] proc: Relax check of mount visibility
Date: Wed, 10 Mar 2021 19:19:55 +0100 [thread overview]
Message-ID: <cover.1615400395.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
---------
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 (5):
docs: proc: add documentation about mount restrictions
proc: Show /proc/self/net only for CAP_NET_ADMIN
proc: Disable cancellation of subset=pid option
proc: Relax check of mount visibility
docs: proc: add documentation about relaxing visibility restrictions
Documentation/filesystems/proc.rst | 18 ++++++++++++++++++
fs/namespace.c | 27 ++++++++++++++++-----------
fs/proc/proc_net.c | 8 ++++++++
fs/proc/root.c | 25 +++++++++++++++++++------
include/linux/fs.h | 1 +
include/linux/proc_fs.h | 1 +
6 files changed, 63 insertions(+), 17 deletions(-)
--
2.29.2
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next reply other threads:[~2021-03-10 18:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 18:19 Alexey Gladkov [this message]
2021-03-10 18:19 ` [PATCH v5 1/5] docs: proc: add documentation about mount restrictions Alexey Gladkov
2021-03-10 18:19 ` [PATCH v5 2/5] proc: Show /proc/self/net only for CAP_NET_ADMIN Alexey Gladkov
2021-03-10 18:19 ` [PATCH v5 3/5] proc: Disable cancellation of subset=pid option Alexey Gladkov
2021-03-10 18:19 ` [PATCH v5 4/5] proc: Relax check of mount visibility Alexey Gladkov
2021-03-10 19:42 ` kernel test robot
2021-03-10 18:20 ` [PATCH v5 5/5] docs: proc: add documentation about relaxing visibility restrictions Alexey Gladkov
2021-03-10 20:07 ` [PATCH v5 0/5] proc: Relax check of mount visibility Alexey Gladkov
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