[PATCH] yama: don't abuse rcu_read_lock/get_task_struct in yama_task_prctl()

[Oleg Nesterov]

Damn, sorry for the spam ;)

On 02/19, Oleg Nesterov wrote:
>
> Forgot to say...
>
> with or without this patch the usage of ptrace_relation->tracer/tracee
> doesn't look right (safe) to me... but probably I missed something
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Yes I did. I didn't realize that put_task_struct(tracer/tracee) calls
security_task_free() -> yama_task_free().

Sorry fo the noise.

Oleg.