ptrace && cred_exec_mutex (Was: [PATCH] ptrace:tracehook_unsafe_exec: remove the stale comment)

[Oleg Nesterov]

(change subject, add more CCs)

On 04/23, Roland McGrath wrote:
>
> > tracehook_unsafe_exec() doesn't need task_lock(), remove the old comment.
>
> Please make it instead say that cred_exec_mutex is held by the caller
> through the exec.

Yes. Except it looks like ->cred_exec_mutex is never used in fact.

ptrace_attach() takes current->cred_exec_mutex ? iow, ptrace and exec
use different locks ?

Oleg.

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