Re: [Xen-devel] Fixation on polarssl 1.1.4 - EOL was 2013-10-01

["Xu, Quan" <quan.xu@xxxxxxxxx>]

On February 16, 2016 1:08am, <wei.liu2@xxxxxxxxxx> wrote:
> On Mon, Feb 15, 2016 at 10:45:48AM -0600, Doug Goldstein wrote:
> > On 2/15/16 10:28 AM, Wei Liu wrote:
> > > On Sun, Feb 14, 2016 at 07:39:35PM +1100, Steven Haigh wrote:
> > >> Hi all,
> > >>
> > >> Just been looking at the polarssl parts in Xen 4.6 and others -
> > >> seems like we're hard coded to version 1.1.4 which was released on 31st
> May 2012.
> > >>
> > >> Branch 1.1.x has been EOL for a number of years, 1.2.x has been EOL
> > >> since Jan.
> > >>
> > >> It's now called mbedtls and current versions are 2.2.1 released in
> > >> Jan this year.
> > >>
> > >> I'm not exactly clear on what polarssl is used for (and why not
> > >> openssl?) - but is it time this was shown some loving?
> > >>
> > >
> > > I grep'ed for polarssl in tree and the only user seems to be vtpm.
> > > I've CC'ed Daniel and Quan for you.
> > >
> > > Wei.
> > >
> >
> > Looks like pv-grub has a build dependency on it as well based on the
> > snippet from stubdom/Makefile.
> >
> > .PHONY: grub
> > grub: cross-polarssl grub-upstream $(CROSS_ROOT)
> >
> 
> Oh, yes, you're right.
> 
> Looking at the source code pv-grub only needs the sha1 function from polarssl
> which might be easy to dealt with though. On the other hand, if there is no
> critical bug fix to the sha1 function, I wouldn't bother upgrading polarssl.
> 
> In fact, I think vtpm also only cares about some crypto algorithms like AES 
> and
> SHA. We'd better check if there is any critical update to those functions 
> before
> doing anything.
> 


Agreed.
If you really want to upgrade it, IMO this change would be backward compatible.
btw, it may be not an easy task to build the test env, and I can help you test 
your patch.

Quan

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