linux-kernel - ptrace && cred_exec_mutex (Was: [PATCH] ptrace: tracehook_unsafe

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Message-ID: <20090424163949.GA12035@redhat.com>
Date:	Fri, 24 Apr 2009 18:39:49 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Hugh Dickins <hugh@...itas.com>
Subject: ptrace && cred_exec_mutex (Was: [PATCH] ptrace:
	tracehook_unsafe_exec: remove the stale comment)

(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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