linux-kernel - Re: ptrace: selinux_bprm_committed_creds: simplify __wake_up_parent() code and s/parent/real

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Message-Id: <20090430224407.63B9DFC3BF@magilla.sf.frob.com>
Date:	Thu, 30 Apr 2009 15:44:07 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Eric Paris <eparis@...isplace.org>,
	James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org
Subject: Re: ptrace: selinux_bprm_committed_creds: simplify
	__wake_up_parent() code and s/parent/real_parent/

> Afaics, with this patch the only user of ->parent outside of ptrace.c & co
> is arch/ia64/kernel/mca.c:format_mca_init_stack(). Hopefully ->parent will
> die soon.

Woo!  Nice work.  That oddball ia64 case is obviously trivial, it just
wants to avoid uninitialized stuff in its task_struct for a
not-really-a-process.  With your fixes, it seems certain that ->parent
should never be examined in those tasks.  Even so, the extra initialization
doesn't hurt.  You could clean it up today with:
	tracehook_finish_clone(p, 0, 0);
at the end (in place of touching ->parent).  
That will dtrt both now and later.


Thanks,
Roland
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