[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v2 3/3] [GSOC14] FIX:- Race condition between initializing shared ring and mempaging.

On Mon, 2014-07-21 at 15:40 +0100, Andrew Cooper wrote:

> > 
> > Note that the XSA commmit, 6ae2df93c27, does exactly that. Enable
> > paging/access/sharing, and only after that decrease reservation (and
> > after that unpause). So the window is open ... methinks?
> No - it does a domain pause around this set of critical operations, so
> the guest is guaranteed not to be running, and therefore cannot
> interfere.

Shouldn't there be a memset in here somewhere? To clear out any bogus
material in the ring? (maybe the caller of this code always clears the
ring itself, I didn't check that)


Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.