opencontainers/runc v1.2.0

runc v1.2.0 -- "できるときにできることをやるんだ。それが今だ。"

on GitHub

This is the long-awaited release of runc 1.2.0! The primary changes from rc3
are general improvements and fixes for minor regressions related to the
new /proc/self/exe cloning logic in runc 1.2, follow-on patches related
to CVE-2024-45310, as well as some other minor changes.

• In order to alleviate the remaining concerns around the memory usage and
  (arguably somewhat unimportant, but measurable) performance overhead of
  memfds for cloning /proc/self/exe, we have added a new protection using
  overlayfs that is used if you have enough privileges and the running
  kernel supports it. It has effectively no performance nor memory overhead
  (compared to no cloning at all). (#4448)
• The original fix for CVE-2024-45310 was intentionally very
  limited in scope to make it easier to review, however it also did not handle
  all possible os.MkdirAll cases and thus could lead to regressions. We have
  switched to the more complete implementation in the newer versions of
  github.com/cyphar/filepath-securejoin. (#4393, #4400, #4421, #4430)
• In certain situations (a system with lots of mounts or racing mounts) we
  could accidentally end up leaking mounts from the container into the host.
  This has been fixed. (#4417)
• The fallback logic for O_TMPFILE clones of /proc/self/exe had a minor
  bug that would cause us to miss non-noexec directories and thus fail to
  start containers on some systems. (#4444)
• Sometimes the cloned /proc/self/exe file descriptor could be placed in a
  way that it would get clobbered by the Go runtime. We had a fix for this
  already but it turns out it could still break in rare circumstances, but it
  has now been fixed. (#4294, #4452)
• It is not possible for runc kill to work properly in some specific
  configurations (such as rootless containers with no cgroups and a shared pid
  namespace). We now output a warning for such configurations. (#4398)
• memfd-bind: update the documentation and make path handling with the systemd
  unit more idiomatic. (#4428)
• We now use v0.16 of Cilium's eBPF library, including fixes that quite a few
  downstreams asked for. (#4397, #4396)
• Some internal runc init synchronisation that was no longer necessary (due
  to the /proc/self/exe cloning move to Go) was removed. (#4441)

Static Linking Notices

The runc binary distributed with this release are statically linked with
the following GNU LGPL-2.1 licensed libraries, with runc acting
as a "work that uses the Library":

• libseccomp

The versions of these libraries were not modified from their upstream versions,
but in order to comply with the LGPL-2.1 (§6(a)), we have attached the
complete source code for those libraries which (when combined with the attached
runc source code) may be used to exercise your rights under the LGPL-2.1.

However we strongly suggest that you make use of your distribution's packages
or download them from the authoritative upstream sources, especially since
these libraries are related to the security of your containers.

Thanks to all of the contributors who made this release possible:

• Akhil Mohan akhilerm@gmail.com
• Akihiro Suda akihiro.suda.cz@hco.ntt.co.jp
• Aleksa Sarai cyphar@cyphar.com
• Amir M. Ghazanfari a.m.ghazanfari76@gmail.com
• Kir Kolyshkin kolyshkin@gmail.com
• Rafael Roquetto rafael.roquetto@grafana.com
• Rodrigo Campos rodrigoca@microsoft.com
• Sebastiaan van Stijn github@gone.nl
• Stavros Panakakis stavrospanakakis@gmail.com
• lifubang lifubang@acmcoder.com

Signed-off-by: Aleksa Sarai cyphar@cyphar.com