Re: Security issues with local filesystem caching

Trond Myklebust
2006-11-02T21:24:52Z

On Thu, 2006-11-02 at 20:38 +0000, David Howells wrote:
> Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
>
> > Just why are you doing all this? Why do we need a back-end that requires
> > all this extra client-side security infrastructure in order to work?
>
> Well, both Christoph and Al are of the opinion that I should be using
> vfs_mkdir() and co rather than bypassing the security and calling inode ops
> directly.

...but why are you needing to call vfs_mkdir? I thought the standard
cachefs backend just uses a pool of files, rather like the original AFS
cache did. Are you trying to mirror the layout and the permissions of
the NFS filesystem? That is a lot more work than it is worth...

> Also I should be setting security labels on the files I create.

To what end? These files shouldn't need to be made visible to userland
at all.

Cheers,
Trond