Re: [PATCH v5 0/5] proc: Relax check of mount visibility

On Wed, Mar 10, 2021 at 07:19:55PM +0100, Alexey Gladkov wrote:

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.

I'm sorry about that unfinished patch set. Please ignore it.

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

-- 
Rgrds, legion