linux-kernel - Re: [PATCH 3/3] do_wait: return security_task

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Message-Id: <20080331202052.C333126F8E9@magilla.localdomain>
Date:	Mon, 31 Mar 2008 13:20:52 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] do_wait: return security_task_wait() error code in place of -ECHILD

> Suppose that we have 2 childs. The first one is running, the second is zombie
> but nacked by security_task_wait(). Now waitpid(-1, WHOHANG|WEXITED) returns 0,
> a bit strange/confusing.

What else would it do?  There is a child that will be reapable eventually
(the running one).  It might be even more strange and more confusing if you
hid the running child just because there is a permission-denied one.  If
you ask specifically for the permission-denied zombie you'll get the
permission error.  I'm not sure we can do better.


Thanks,
Roland


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