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runc 1.0-rc6 -- "For Real This Time"
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@cyphar cyphar released this 22 Nov 11:50
v1.0.0-rc6
This tag was signed with the committer’s verified signature.
cyphar Aleksa Sarai
GPG key ID: 9E18AA267DDB8DB4
Learn about vigilant mode.
ccb5efd
This commit was signed with the committer’s verified signature.
cyphar Aleksa Sarai
GPG key ID: 9E18AA267DDB8DB4
Learn about vigilant mode.

This is the final feature release of runc before 1.0, rather than 1.0
itself. The reason for this is that, during the preparations for this
release (which was originally meant to be 1.0) it was brought up that
there were several spec-compliance problems. One of these was related to
hook ordering, and upon trying to fix them it turns out that many users
(notably the NVIDIA OCI hooks) make use of our incorrect hook ordering.
Many of the proposed solutions to this problem all require a lot of time
and co-ordination, and thus would stall this release indefinitely.

So, the idea is to have an intermediate release which will mark a
freeze-on-everything-except-spec-compliance-bugs. No other changes will
be included pre-1.0 (aside from security patches obviously).

NOTE: This release's artefacts were updated on 2020-07-30 to correct an
LGPL compliance issue (we previously did not include the source code of
libseccomp with our releases) and thus we had to recompile our runc
binaries to be sure we were distributing the correct version of libseccomp.
All of the binaries are still signed by the same maintainer key, and thus can
still be easily validated.

NOTE: This release's artefacts were updated on 2021-04-07, to correct an
issue with the .tar.xz archive from 2020-07-30 (the archive had malformed
paths due to a bug in historical release scripts -- which caused the update
on 2020-07-30 to change the checksum of the source code archive). See #2895
for more details. All of the binaries are still signed by the same maintainer
key, and thus can still be easily validated.

Features:

  • Upgrade to using Go 1.10. #1711
  • Upgrade to CRIU 3.11. #1711 #1864 #1935 #1936
  • Allow for checkpoint-restore into a foreign network namespace. #1849
  • The "type" field for bind-mounts is now ignored. This is important, because
    many users incorrectly assume that "type" defines a bind-mount and not
    "options". Previously you had to set both. #1753 #1845
  • "setgroups=allow" is now possible in rootless mode, but requires the use of
    the privileged newgidmap helper (fully-rootless still requires
    "setgroups=deny"). #1693
  • Rootless mode can now safely ignore a read-only cgroupfs. #1759 #1806
  • Several aspects of rootless mode are now used inside user namespaces. This
    is necessary for a bunch of useful things (such as running Docker inside an
    user namespace), but did cause some breakages. We think they've all been
    fixed -- but if not please submit an issue! #1688 #1808 #1816 #1862
  • Improve kernel.{domain,host}name sysctl handling, to allow the NIS
    domainname to be set from Docker or other callers without an OCI spec
    change. #1827
  • Add documentation for one of the more confusion parts of runc, how terminals
    are handled (including an explanation of --console-socket). All the gory
    details and recommendations are available in docs/terminals.md. #1730
  • Allow /proc to be bind-mounted over (useful for rootless containers). #1832
  • Ignore ENOSYS for keyctl(2) operations. This is necessary to get Docker
    working with LXC under the default seccomp profile (which is what ChromeOS
    uses). #1893
  • Add support for the Intel RDT/MBA resource control system. #1632 #1913
  • Allow building with completely-disabled kmemcg support, to get around
    problems with broken kernels (RHEL 7.5 can oops with kmemcg accounting
    enabled). #1921 #1922 #1930
  • Add support for cgroup namespaces, which in turn fixes a few other issues we
    encountered with the previous code (which could be moving us to a cgroup
    during Go execution). #1916

Fixes:

  • Namespace creation with user namespaces now plays a bit nicer with SELinux
    and IPC (which had a bug where the in-kernel mqueue mount would have the
    wrong tag if using unshare(CLONE_NEWUSER|CLONE_NEWIPC)). This is done to
    avoid future problems with broken kernel integration. #1562
  • Mild refactor of libcontainer/user. #1749
  • Fix null-pointer-exception when no cgroups were set. #1752
  • Various DBus and systemd related changes for the systemd-cgroup driver.
    #1754 #1772 #1776 #1781 #1805 #1917
  • Apply SELinux label to masked directories. #1756
  • Obey the XDG spec and set the sticky bit on runc's root when using
    XDG_RUNTIME_DIR (in rootless mode). #1760
  • Only configure network namespaces if we are creating them. #1777
  • Fix race in runc-exec against a currently-exiting pid1. #1812
  • Forward GOMAXPROCS to try to reduce the number of threads started by 'runc
    init'. Unforunately there's no way to stop Go from spawning new threads so
    this is more of a recommendation. #1830
  • Fix tmpcopyup in cases where /tmp is not a private mount. #1873
  • Whitelist /proc/loadavg for bind-mounting. #1882
  • Protect against deletion of runc state directory with a containerid of "..",
    as well as the addition of other path hardening code. #1883
  • Handle duplicated cgroupfs mountpoint entries more sanely, to make runc work
    on distributions that use-and-abuse shared subtrees. #1817
  • Fix console hanging in several cases. #1895 #1897
  • Lock-to-a-thread during 'runc init' to ensure that that we don't switch
    threads and run within a different SELinux label. #1814
  • Respect cgroupPath when trying to find the cgroupfs mountpoint (which can
    happen in cases where containers are given different cgroupfs mounts). #1872
  • And many other minor changes, many from first-time contributors! #1746 #1748
    #1749 #1784 #1779 #1785 #1796 #1819 #1825 #1836 #1824 #1820 #1838 #1840
    #1841 #1867 #1871 #1855 #1854 #1874 #1868 #1886 #1892 #1858 #1894 #1908
    #1880 #1910 #1915 #1903 #1922 #1926 #1928 #1925 #1911

Fixes (for spec violations):

  • Don't set a container to "running" when exec-ing into it (because it might
    be in the "created" state). #1771
  • oom_score_adj is now no longer modified if it was unspecified in config.json
    (this was a spec violation). #1759
  • Set "status" in hook stdin, as well as switch to using *spec.State to avoid
    JSON-representation drift. #1741

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":

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 that made this release possible:

Signed-off-by: Aleksa Sarai asarai@suse.de

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