diff options
| author | Christian Brauner <brauner@kernel.org> | 2026-02-26 14:50:09 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-02-27 22:00:08 +0100 |
| commit | e6b899f08066e744f89df16ceb782e06868bd148 (patch) | |
| tree | fe5fbdafe96c1c39aabef7e65eae4d210a79e8d7 /kernel | |
| parent | a0b4c7a49137ed21279f354eb59f49ddae8dffc2 (diff) | |
nsfs: tighten permission checks for ns iteration ioctls
Even privileged services should not necessarily be able to see other
privileged service's namespaces so they can't leak information to each
other. Use may_see_all_namespaces() helper that centralizes this policy
until the nstree adapts.
Link: https://patch.msgid.link/20260226-work-visibility-fixes-v1-1-d2c2853313bd@kernel.org
Fixes: a1d220d9dafa ("nsfs: iterate through mount namespaces")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Cc: stable@kernel.org # v6.12+
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/nscommon.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/nscommon.c b/kernel/nscommon.c index bdc3c86231d3..3166c1fd844a 100644 --- a/kernel/nscommon.c +++ b/kernel/nscommon.c @@ -309,3 +309,9 @@ void __ns_ref_active_get(struct ns_common *ns) return; } } + +bool may_see_all_namespaces(void) +{ + return (task_active_pid_ns(current) == &init_pid_ns) && + ns_capable_noaudit(init_pid_ns.user_ns, CAP_SYS_ADMIN); +} |