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

[Jan Kara]

  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@xxxxxxxxxxxxxx>
> ---
>  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 +#define VM_REVOKED	0x04000000	/* Mapping has been revoked */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@xxxxxxx>
SuSE CR Labs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/