linux-toradex.git/include/linux/ns_common.h, branch v7.0-rc1

nsproxy: fix free_nsproxy() and simplify create_new_namespaces()

2025-11-14T12:10:38+00:00

Make it possible to handle NULL being passed to the reference count
helpers instead of forcing the caller to handle this. Afterwards we can
nicely allow a cleanup guard to handle nsproxy freeing.

Active reference count handling is not done in nsproxy_free() but rather
in free_nsproxy() as nsproxy_free() is also called from setns() failure
paths where a new nsproxy has been prepared but has not been marked as
active via switch_task_namespaces().

Link: https://lore.kernel.org/690bfb9e.050a0220.2e3c35.0013.GAE@google.com
Link: https://patch.msgid.link/20251111-sakralbau-guthaben-7dcc277d337f@brauner
Fixes: 3c9820d5c64a ("ns: add active reference count")
Reported-by: syzbot+0b2e79f91ff6579bfa5b@syzkaller.appspotmail.com
Reported-by: syzbot+0a8655a80e189278487e@syzkaller.appspotmail.com
Signed-off-by: Christian Brauner

ns: drop custom reference count initialization for initial namespaces

2025-11-11T09:01:32+00:00

Initial namespaces don't modify their reference count anymore.
They remain fixed at one so drop the custom refcount initializations.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-16-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: add asserts for initial namespace active reference counts

2025-11-11T09:01:32+00:00

They always remain fixed at one. Notice when that assumptions is broken.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-14-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: add asserts for initial namespace reference counts

2025-11-11T09:01:31+00:00

They always remain fixed at one. Notice when that assumptions is broken.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-13-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: make all reference counts on initial namespace a nop

2025-11-11T09:01:31+00:00

They are always active so no need to needlessly cacheline ping-pong.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-12-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: rename is_initial_namespace()

2025-11-11T09:01:31+00:00

Rename is_initial_namespace() to ns_init_inum() and make it symmetrical
with the ns id variant.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-9-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: make is_initial_namespace() argument const

2025-11-11T09:01:31+00:00

We don't modify the data structure at all so pass it as const.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-8-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

nstree: switch to new structures

2025-11-11T09:01:30+00:00

Switch the nstree management to the new combined structures.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-5-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: move namespace types into separate header

2025-11-11T09:01:30+00:00

Add a dedicated header for namespace types.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-1-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner

ns: add asserts for active refcount underflow

2025-11-10T09:20:54+00:00

Add a few more assert to detect active reference count underflows.

Link: https://patch.msgid.link/20251109-namespace-6-19-fixes-v1-6-ae8a4ad5a3b3@kernel.org
Signed-off-by: Christian Brauner