runc 1.1.5 -- "囚われた屈辱は 反撃の嚆矢だ"

This is the fifth patch release in the 1.1.z series of runc, which fixes
three CVEs found in runc.

• CVE-2023-25809 is a vulnerability involving rootless containers where
  (under specific configurations), the container would have write access
  to the /sys/fs/cgroup/user.slice/... cgroup hierarchy. No other
  hierarchies on the host were affected. This vulnerability was
  discovered by Akihiro Suda.
  GHSA-m8cg-xc2p-r3fc

• CVE-2023-27561 was a regression which effectively re-introduced
  CVE-2019-19921. This bug was present from v1.0.0-rc95 to v1.1.4. This
  regression was discovered by @Beuc.
  GHSA-vpvm-3wq2-2wvm

• CVE-2023-28642 is a variant of CVE-2023-27561 and was fixed by the same
  patch. This variant of the above vulnerability was reported by Lei
  Wang.
  GHSA-g2j6-57v7-gm8c

In addition, the following other fixes are included in this release:

• Fix the inability to use /dev/null when inside a container. (#3620)
• Fix changing the ownership of host's /dev/null caused by fd redirection
  (a regression in 1.1.1). (#3674, #3731)
• Fix rare runc exec/enter unshare error on older kernels, including
  CentOS < 7.7. (#3776)
• nsexec: Check for errors in write_log(). (#3721)

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:

• Akihiro Suda akihiro.suda.cz@hco.ntt.co.jp
• Aleksa Sarai cyphar@cyphar.com
• Evan Phoenix evan@phx.io
• Jaroslav Jindrak dzejrou@gmail.com
• Kir Kolyshkin kolyshkin@gmail.com
• Mrunal Patel mrunal@me.com
• Rodrigo Campos rodrigoca@microsoft.com
• Sebastiaan van Stijn thaJeztah@users.noreply.github.com
• Shengjing Zhu zhsj@debian.org
• Tianon Gravi admwiggin@gmail.com

[Due to the security-critical nature of this release, it was released
without a direct vote but was agreed to by the required number of
maintainers.]

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