Re: OpenSSL “DROWN” vulnerability & grafts

[Efraim Flashner]

On Tue, Mar 01, 2016 at 10:16:47PM +0100, Ludovic Courtès wrote:
> Hello!
> 
> OpenSSL 1.0.2g was released today, fixing several serious security
> vulnerabilities, several of which are referred to as “DROWN” (as has
> become security-marketing tradition.)
> 
> This gave a good incentive to fix the “grafting” mechanism described at:
> 
>   https://www.gnu.org/software/guix/manual/html_node/Security-Updates.html
> 
> The problem was that until now, grafting was not recursive:
> <http://bugs.gnu.org/22139>.  This is fixed in c22a132, so we “rushed”
> to use it in ‘master’ for the OpenSSL upgrade, which is done in caeadfd.
> 
> So now is the time to find out how well the new implementation scales
> and to address any limitations.  :-)
> 
> A potentially disturbing thing with the new code is that it starts
> building/downloading things early, typically before it has written “The
> following derivations will be built”; see
> <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22139#13>.
> 
> A limitation of the current implementation is that the replacement
> package must have exactly the same name and version as the package being
> replaced.  So OpenSSL 1.0.2g shows up as /gnu/store/…-openssl-1.0.2f.
> 
> The store file name of the old OpenSSL is given by:
> 
>   guix build openssl --no-grafts
> 
> … and the new one is given by:
> 
>   guix build openssl
> 
> For example, to verify which OpenSSL(s) your whole profile refers to,
> you can run:
> 
>   guix gc -R $(readlink -f ~/.guix-profile) | grep openssl
> 
> and check the store file names that you get (make sure to turn off
> guix-prettify-mode :-)).  Likewise for a GuixSD generation:
> 
>   guix gc -R $(guix system build config.scm) | grep openssl
> 
> And for running processes:
> 
>   lsof | grep /gnu/store/.*openssl
> 
> Seems like this tricks could go in the manual under “Security Updates”
> no?
> 
> Feedback welcome!
> 
> Ludo’.

BIG thanks for getting this working, its a great way to keep our systems
up and running while taking care of the security issues.

One issue that I noticed on my slow netbook is that `guix package -u`,
with no updates, now takes ~15 minutes, while before it was ~30 seconds.

-- 
Efraim Flashner   <address@hidden>   אפרים פלשנר
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