Re: [RFC][PATCH 00/20] Mount writer count and read-only bind mounts(v2)

[Grzegorz Kulewski]

On Fri, 16 Jun 2006, Dave Hansen wrote:
> The following series implements read-only bind mounts.  This feature
> allows a read-only view into a read-write filesystem.

Thanks, I like this idea very much. I think I have found at least one good
use for it even before it is merged. :-)

But...

> One note: the previous patches all worked this way:
>
> 	mount --bind -o ro /source /dest
>
> These patches have changed that behavior.  It now requires two steps:
>
> 	mount --bind /source /dest
> 	mount -o remount,ro  /dest

Isn't this some kind of security risk (at least in my planned use)? I mean 
- for a small fraction of second somebody seeing /dest can write 
/source... No?


Thanks,

Grzegorz Kulewski

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