Re: [PATCH 00/25] move handling of setuid/gid bits from VFS into individual setattr functions (RESEND)

[Christoph Hellwig]

On Fri, Aug 10, 2007 at 04:47:52PM -0400, Jeff Layton wrote:
> attr->ia_valid after the setattr operation returns. If either ATTR_KILL_*
> bit is set then BUG(). The helper function already clears those bits
> so anything using it should automatically be ok. We'd have to fix
> up NFS and a few others that don't implement suid/sgid.
> 
> This is not as certain as changing the name of the inode operation. It
> would only pop when someone is attempting to change a setuid/setgid
> file on these filesystems. Still, it should conceivably catch most if
> not all offenders. Would that be sufficient to take care of everyone's
> concerns?

I like the idea of checking ia_valid after return a lot.  But instead of
going BUG() it should just do the default action, that we can avoid
touching all the filesystem and only need to change those that need
special care.  I also have plans to add some new AT_ flags for implementing
some filesystem ioctl in generic code that would benefit greatly from
the ia_valid checkin after return to return ENOTTY fr filesystems not
implementing those ioctls.
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