Subject: Re: How to resolve the filename(s) for a vnode?
To: der Mouse <mouse@Rodents.Montreal.QC.CA>
From: Jason Thorpe <email@example.com>
Date: 10/20/2005 08:43:23
On Oct 19, 2005, at 4:30 PM, der Mouse wrote:
> Yes. But note that for calls that involve a path walk, I was
> recommending using the path which is already at hand. Something
> fh*()-like was only for calls which don't involve paths, and for
> you must already have access to the vnode anyway, so performing checks
> based on a path walk is inappropriate. After all, if you open a file
> and then, while it's open, protect the path, it doesn't prevent you
> from accessing the file as long as you keep it open.
Perhaps you're mis-understanding how fh*() work. fhopen() allows you
to open a file (using a file handle) that you DO NOT currently have
open, and bypasses the full path permission checking along the way.
For this reason, its use is restricted to the superuser.