linux-kernel - Re: [PATCH 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared memory

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Date:	Fri, 2 Mar 2007 16:55:53 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	David Howells <dhowells@...hat.com>
cc:	Robin Holt <holt@....com>,
	"Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com>,
	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <soshima@...hat.com>,
	"Hideo AOKI@...hat" <haoki@...hat.com>
Subject: Re: [PATCH 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared
 memory 

On Fri, 16 Feb 2007, David Howells wrote:
> Robin Holt <holt@....com> wrote:
> 
> > How about:
> > 		if (vma->vm_mm->coredump_omit_anon_shared) {
> > 
> > Then the calls to maydump() would be unchanged:
> 
> VMAs are a shared resource under NOMMU conditions.

That's a disturbing remark.  Under precisely what NOMMU conditions?

I had thought Robin's suggestion very sensible; and throughout mm/
it has seemed pretty random whether we pass an "mm" argument down
in addition to "vma", or just take vma->vm_mm at whatever level needs.

You seem to be suggesting vma->vm_mm is dangerous when CONFIG_NOMMU,
but we MMU people are scarily unaware of that.  Perhaps you need to
put #ifndef CONFIG_NOMMU around vm_mm in struct vm_area_struct?

Or am I totally misunderstanding?

Hugh
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