Better living through software

Ben Hutchings's diary of life and technology

Email: ben@decadent.org.uk • Twitter: @benhutchingsuk • Debian: benh • Gitweb: git.decadent.org.uk • Github: github.com/bwhacks

Sun, 02 Jun 2019

Debian LTS work, May 2019

I was assigned 18 hours of work by Freexian's Debian LTS initiative and worked all those hours this month.

I released Linux 3.16.66, and then prepared and released Linux 3.16.67 with a small number of fixes. I backported the updated Linux 4.9 packages from Debian 9.9, uploaded them and issued DLA-1771.

I had a little advance notice of the MDS speculative execution flaws, and started backporting the mitigations for these to older stable branches, starting with a version for Linux 4.14. I backported to 4.9 (Debian stretch/jessie) first, then to 4.4 (CIP) and 3.16 (Debian jessie). The charge for this time was accordingly split between CIP and Freexian.

I backported the security update for Linux 4.9 from stretch to jessie and issued DLA-1787.

The backport of mitigations to Linux 3.16 took longest to finish, as the x86 kernel exit path was substantially rewritten between 3.16 and 4.4. I needed to apply the mitigation in multiple assembly-language routines rather then a single C function, and before that I needed to backport support for static_branch patching in assembly-language source files. I sent the changes out for review and testing as Linux 3.16.68-rc1, and as Debian packages on people.debian.org. Since no problems were found, I released Linux 3.16.68, uploaded updated packages, and issued DLA-1799.

posted at: 19:39 | path: / | permanent link to this entry