Re: [NFS] [PATCH 2/7] NFS: if ATTR_KILL_S*ID bits are set, thenskip mode change

[Trond Myklebust]

On Sat, 2007-09-15 at 01:43 +1000, Greg Banks wrote:
> On Fri, Sep 14, 2007 at 10:58:38AM -0400, Jeff Layton wrote:
> > If Irix isn't clearing these bits
> > on a write then it might be good to see if they can fix that...
> 
> I think first you'd have to mount a serious argument that it's broken,
> more serious than "it works differently from Linux".

How about: "If IRIX isn't clearing these bits then they're leaving their
customers wide open to all sorts of security issues."

Unless you make the chmod/chgrp atomic with the write, then there will
always be a way for a client to inject data while the setuid/setgid bits
are set: basically, it allows said client to rewrite a setuid/setgid
executable.

We're not fixing this in the client because it isn't fixable on the
client.

Trond

-
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/