linux-kernel - Re: [PATCH 1/7] revoke: special mmap handling

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Message-ID: <20070312132553.GG30777@atrey.karlin.mff.cuni.cz>
Date:	Mon, 12 Mar 2007 14:25:53 +0100
From:	Jan Kara <jack@...e.cz>
To:	Pekka J Enberg <penberg@...helsinki.fi>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, alan@...rguk.ukuu.org.uk, serue@...ibm.com
Subject: Re: [PATCH 1/7] revoke: special mmap handling

  Hi,

> This adds special handling for revoked memory mappings.  We want to
> raise SIGBUS when accessing revoked mappings and return ENODEV when
> trying to remap with mmap(2).
> 
> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
> ---
>  include/linux/mm.h |    2 ++
>  mm/memory.c        |    3 +++
>  mm/mmap.c          |   12 ++++++++----
>  3 files changed, 13 insertions(+), 4 deletions(-)
> 
> Index: uml-2.6/include/linux/mm.h
> ===================================================================
> --- uml-2.6.orig/include/linux/mm.h	2007-03-08 10:24:24.000000000 +0200
> +++ uml-2.6/include/linux/mm.h	2007-03-08 10:24:25.000000000 +0200
> @@ -170,6 +170,8 @@
>  #define VM_INSERTPAGE	0x02000000	/* The vma has had "vm_insert_page()" done on it */
>  #define VM_ALWAYSDUMP	0x04000000	/* Always include in core dumps */
>  
> +#define VM_REVOKED	0x04000000	/* Mapping has been revoked */
> +
  Is it intended to conflict with VM_ALWAYSDUMP? I'd guess not and if
yes, it definitely deserves a comment...

										Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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