linux-kernel - Re: [RFC] c/r: prctl: Add ability to set new mm_struct::exe

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Message-ID: <20120309152122.GA7802@redhat.com>
Date:	Fri, 9 Mar 2012 16:21:22 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] c/r: prctl: Add ability to set new mm_struct::exe_file v3

On 03/09, Cyrill Gorcunov wrote:
>
> OK, Oleg, can't argue, you've convinced me ;) I'll drop this WARN_ON.

Yes, yes, I am a troll!

> Would it be enough for your Reviewed-by tag? /me hides

Yes.

But, when you send the patch to Andrew, please remind that he
should remove the evidence of my ignorance from -mm first.


Just one note for the record, prctl_set_mm_exe_file() does

	if (mm->num_exe_file_vmas)
		return -EBUSY;

We could do

	if (mm->exe_file)
		return -EBUSY;

This way "because this feature is a special to C/R" becomes
really true. IOW, you can't do PR_SET_MM_EXE_FILE twice.

I am fine either way, just I want to ensure you really want
the current version.

Oleg.

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