Re: [uml-devel] hostfs

[Henrik N. <hn...@ma...>]

hostfs is quite different from a normal fs when it comes to file 
attributes.

a) It uses the attributes provided by the host file system

b) For root files it uses userid squashing, presenting files owned by the 
userid running UML as owned by root within the UML.

The UML kernel is restricted by the privileges of the user running UML. 
This means that to protect files or directories, make them owned by 
another user and not writeable by the user who runs UML.

Because of this hostfs is practically limited to "root" files only unless
you run uml as root on the host, in which case all bets are off.

hostfs is very suitable for system and root files, but not as suitable for 
normal user home directories or other writeable non-root data within the 
UML.

Regards
Henrik

On Wed, 26 Feb 2003, Trent Lloyd wrote:

> HI,
> 
> 	im curious if there is much of a different with hostfs to a normal fs
> 
> 	i.e. does it change any userids, restrict setuid root etc etc
> 	one would think it has some limits since u cant chown to root a file if 
> your running as a usermode process...
> 	someone care to detail?
> 
> -- Trent
> 
> 
> 
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