linux-kernel - Re: + c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm- num_exe_file

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Message-ID: <20120419221602.GU1893@moon>
Date:	Fri, 20 Apr 2012 02:16:02 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"matthltc@...ibm.com" <matthltc@...ibm.com>,
	"tj@...nel.org" <tj@...nel.org>,
	Pavel Emelianov <xemul@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: +
 c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm-
 num_exe_file_vmas-removal.patch added to -mm tree

On Fri, Apr 20, 2012 at 02:08:43AM +0400, Konstantin Khlebnikov wrote:
> >>My question is: unless I missed something "it can't be changed again"
> >>is not actually true. A task does PR_SET_MM_EXE_FILE, then it forks
> >>the new child. The child can do PR_SET_MM_EXE_FILE again. Is this
> >>by design?
> >
> >Hmm, not sure, Konstantin?
> 
> Why not? It has new pid, why it cannot change exe_file? Actually I don't care too.
> But even if we include this bit into MMF_INIT_MASK we cannot forbid exe-file change
> in childs tasks which was forked before exe-file change in parent.

OK, I see, thanks.

	Cyrill
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