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H A Dtest_core.c613e040e Thu Jan 06 15:02:29 CST 2022 Tejun Heo <tj@kernel.org> selftests: cgroup: Test open-time credential usage for migration checks

When a task is writing to an fd opened by a different task, the perm check
should use the credentials of the latter task. Add a test for it.

Tested-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>