[RESEND PATCH v6 0/5] proc: subset=pid: Relax check of mount visibility

Alexey Gladkov
2021-07-16T10:46:46Z

Allow to mount procfs with subset=pid option even if the entire procfs
is not fully accessible to the mounter.

Changelog
---------
v6:
* Add documentation about procfs mount restrictions.
* Reorder commits for better review.

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: subset=pid: 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 | 15 +++++++++++++++
fs/namespace.c | 30 ++++++++++++++++++------------
fs/proc/proc_net.c | 8 ++++++++
fs/proc/root.c | 24 +++++++++++++++++++-----
include/linux/fs.h | 1 +
include/linux/proc_fs.h | 1 +
6 files changed, 62 insertions(+), 17 deletions(-)

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2.29.3