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SubjectRe: [PATCH 0/2] mm->owner to mm->memcg fixes
Michal Hocko <mhocko@kernel.org> writes:

> On Wed 23-05-18 14:46:43, Eric W. Biederman wrote:
> [...]
>> As two processes sharing an mm is useless and highly unlikely there is
>> no need to handle this case well, it just needs to be handled well
>> enough to prevent an indefinite loop. So when css_tryget_online fails
>> just treat the mm as belong to the root memory cgroup.
>
> Does that mean that a malicious user can construct such a task and
> runaway from its limits?

Unfortunately if the memory cgroup is delegated than yes that can
happen. So removing the loop in get_mem_cgroup_from_mm won't work.

Eric

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