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LXC 1.0.5 release announcement

14.07.2014
This is the fifth bugfix release for the LXC 1.0 series.

seccomp profile

Outside of the usual bugfixes, this release also introduces one important change.
For systems where LXC is built with seccomp support, containers will now have a seccomp profile enabled
which will prevent calls to the following syscalls:

  • kexec_load
  • open_by_handle_at
  • init_module
  • finit_module,
  • delete_module.

This will amongst other things prevent exploits like the recently release "shocker" exploit.

This profile will be applied to any new or existing container that uses the new-style LXC configurations
(using lxc.include of common configs), so currently the following distributions:
centos, debian, fedora, gentoo, oracle, plamo and ubuntu.

You can turn this off by adding "lxc.seccomp =" in your container's configuration.

If you want to manually turn this on for a container which doesn't use the common config mechanism,
you can add something like "lxc.seccomp = /usr/share/lxc/config/common.seccomp" to the container configuration.

Changes

Core:

  • core: Fix unprivileged containers to work with recent kernels.
  • core: Fix building with -Werror=maybe-uninitialized.
  • core: seccomp: Don't fail on unresolvable syscalls.
  • core: lxc-init: Don't force dropping capabilities.
  • core: configure: Split -lcap and -lselinux out of LIBS.
  • core: configure: Fix expansion of libexecdir.
  • core: seccomp: Support 'all' arch sections.
  • core: seccomp: Fix 32-bit rules.
  • core: seccomp: Enable a default filter for all templates.
  • core: Fix corruption in write_config.
  • core: attach: Fix querying for the current personality.
  • core: cgmanager: Have cgm_set and cgm_get use absolute paths when possible.
  • core: cgmanager: Make sure @value is null-terminated in cgm_get.
  • core: optimization of signal filtering/parsing code.
  • core: apparmor: Allow hugetlbfs by default (similar to tmpfs and restricted by the hugetlb cgroup controller).
  • core: Fix find_fstype_cb to ignore blank lines and comments.

Commands:

  • lxc-autostart: Actually respect -P when passed.
  • lxc-attach: Fix typo in usage.
  • lxc-start: propagate the container exit code.
  • lxc-stop: Fix incorrect timeout handling.
  • lxc-device: Support --version.
  • lxc-ls: Support --version.
  • lxc-start-ephemeral: Support --version.

Tests:

  • tests: Avoid the download template when possible.
  • tests: Don't fail when HOME isn't defined.
  • tests: apparmor: Always end messages with a newline.
  • tests: Clarify error message and fix return codes.
  • tests: lxc-test-ubuntu doesn't actually need bind9-host.

Templates:

  • lxc-debian: standardize formatting.
  • lxc-debian: fix formatting.

Bindings:

  • python3: Fix attach_wait and threads.

Those stable fixes were brought to you by 11 individual contributors.

Downloads

The release tarballs may be found on our download page and we expect most distributions
will very soon ship a packaged version of LXC 1.0.5.

Should you be interested in individual changes or just looking at the detailed development history,
our stable branch is on GitHub.

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