[PATCH 1/1] Drivers: hv: Implement the file copy service

[gregkh at linuxfoundation.org]

On Thu, Jan 09, 2014 at 11:09:21PM +0300, Dan Carpenter wrote:
> We've had this discussion before where you urge me to trust the host...
> 
>  Problem: This code is racy.
> Solution: The host will only send one message at a time.
> 
> Now I have to audit the user space code on the host and I don't feel
> like doing that so you win.
> 
> I wish we had a better way to do IPC.  If kdbus were ready, that might
> have worked for this, and it's a better solution because both sender and
> reciever code will be written in a less trusting way.

kdbus is almost ready, it might make 3.15, depending on the result of
work that is happening at linux.conf.au and FOSDEM.

If it would be a better solution for this, that's even more reason to
get kdbus merged soon, no need to add something that doesn't really
work.

But, how will kdbus help with this?  It's a userspace <-> userspace
message transmission bus, would you want the kernel to be a receiver or
sender here?

thanks,

greg k-h