[to-be-updated] taskstats-restrict-exit-listener-registration-to-init_net.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

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The quilt patch titled
     Subject: taskstats: restrict exit listener registration to init_net
has been removed from the -mm tree.  Its filename was
     taskstats-restrict-exit-listener-registration-to-init_net.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: 성병찬 <tjdqudcks0424@naver.com>
Subject: taskstats: restrict exit listener registration to init_net
Date: Fri,  2 Oct 2026 07:37:20 +0900

Taskstats exit listeners are stored globally per CPU as bare netlink port
IDs, while exit records are always sent through init_net.  Since commit
edc73c7261ca ("kernel: make taskstats available from all net namespaces"),
a task in the initial user and PID namespaces can register a listener from
a child network namespace.

An unprivileged init_net socket can bind the same namespace-local port ID
and receive another UID task's complete exit record.  Direct taskstats
queries and listener registration by that receiver remain denied with
EPERM.

Reject CPU-mask listener registration and deregistration outside init_net.
Keep PID and TGID queries available from non-initial network namespaces,
preserving the getdelays use case added by the cited commit.

AI-assisted source review helped identify this issue.  The code path,
security boundary, and three reproductions on both v7.2.8 and current
mainline were manually verified in isolated QEMU guests.

Link: https://lore.kernel.org/20261001223721.458667-2-tjdqudcks0424@naver.com
Link: https://lore.kernel.org/all/20110630120831.GB7707@albatros/
Link: https://lore.kernel.org/all/87v8x678ph.fsf@email.froward.int.ebiederm.org/
Fixes: edc73c7261ca ("kernel: make taskstats available from all net namespaces")
Signed-off-by: 성병찬 <tjdqudcks0424@naver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Balbir Singh <balbirs@nvidia.com>
Cc: <bsingharora@gmail.com>
Cc: <xu.xin@linux.dev>
Cc: <stable@vger.kernel.org>
---

 kernel/taskstats.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/kernel/taskstats.c~taskstats-restrict-exit-listener-registration-to-init_net
+++ a/kernel/taskstats.c
@@ -454,6 +454,9 @@ static int cmd_attr_cpumask(struct genl_
 	cpumask_var_t mask __free(free_cpumask_var) = CPUMASK_VAR_NULL;
 	int rc;
 
+	if (!net_eq(genl_info_net(info), &init_net))
+		return -EINVAL;
+
 	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 		return -ENOMEM;
 	rc = parse(info->attrs[attr], mask);
_

Patches currently in -mm which might be from tjdqudcks0424@naver.com are