put_mnt_ns(): leave mounts connected

Browse source

When a mount namespace is destroyed, put_mnt_ns() disconnects its mounts
from their mount points. A file descriptor still open on the parent of a
mount point can then be used to look under the mount point.

Locked mounts are kept connected to prevent this. However, a mount is
only locked when its tree is copied across a user namespace boundary. A
mount namespace set up by a privileged component has no locked mounts,
so its mounts are disconnected.

Pass UMOUNT_CONNECTED so every mount is kept connected, as locked mounts
already are.

Signed-off-by: Noah Orlando <Noah.Orlando@deshaw.com>
Link: https://patch.msgid.link/20260706182559.2496448-2-Noah.Orlando@deshaw.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

...

This commit is contained in:

Noah Orlando 2026-07-06 14:25:59 -04:00 • committed by Christian Brauner

parent 30248be570

commit 0342482a4d

No known key found for this signature in database

GPG key ID: 91C61BC06578DCA2

1 changed files with 1 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

fs/namespace.c

View file