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v1.1.3
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This is the third release of the 1.1.z series of runc, and contains
various minor improvements and bugfixes.

  • Our seccomp -ENOSYS stub now correctly handles multiplexed syscalls on
    s390 and s390x. This solves the issue where syscalls the host kernel did not
    support would return -EPERM despite the existence of the -ENOSYS stub
    code (this was due to how s390x does syscall multiplexing). (#3478)
  • Retry on dbus disconnect logic in libcontainer/cgroups/systemd now works as
    intended; this fix does not affect runc binary itself but is important for
    libcontainer users such as Kubernetes. (#3476)
  • Inability to compile with recent clang due to an issue with duplicate
    constants in libseccomp-golang. (#3477)
  • When using systemd cgroup driver, skip adding device paths that don't exist,
    to stop systemd from emitting warnings about those paths. (#3504)
  • Socket activation was failing when more than 3 sockets were used. (#3494)
  • Various CI fixes. (#3472, #3479)
  • Allow to bind mount /proc/sys/kernel/ns_last_pid to inside container. (#3493)
  • runc static binaries are now linked against libseccomp v2.5.4. (#3481)

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

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

v1.1.2
a916309
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This is the second patch release of the runc 1.1 release branch. It
fixes CVE-2022-29162, a minor security issue (which appears to not be
exploitable) related to process capabilities.

This is a similar bug to the ones found and fixed in Docker and
containerd recently (CVE-2022-24769).

  • A bug was found in runc where runc exec --cap executed processes with
    non-empty inheritable Linux process capabilities, creating an atypical Linux
    environment. For more information, see GHSA-f3fp-gc8g-vw66 and
    CVE-2022-29162.
  • runc spec no longer sets any inheritable capabilities in the created
    example OCI spec (config.json) file.
v1.1.1
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This is the first stable release in the 1.1 branch, fixing a few issues
with runc 1.1.0.

Fixed:

  • runc run/start can now run a container with read-only /dev in OCI spec,
    rather than error out. (#3355)
  • runc exec now ensures that --cgroup argument is a sub-cgroup. (#3403)
  • libcontainer systemd v2 manager no longer errors out if one of the files
    listed in /sys/kernel/cgroup/delegate do not exist in container's
    cgroup. (#3387, #3404)
  • Loosen OCI spec validation to avoid bogus "Intel RDT is not supported"
    error. (#3406)
  • libcontainer/cgroups no longer panics in cgroup v1 managers if stat
    of /sys/fs/cgroup/unified returns an error other than ENOENT. (#3435)

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 who made this release possible:

Signed-off-by: Kir Kolyshkin kolyshkin@gmail.com

v1.1.0
067aaf8
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This release only contains very minor changes from v1.1.0-rc.1 and is
the first release of the 1.1.y release series of runc. We do not plan to make
any new releases of the 1.0.y release series of runc, so users are strongly
encouraged to update to 1.1.0.

Changed:

  • libcontainer will now refuse to build without the nsenter package being
    correctly compiled (specifically this requires CGO to be enabled). This
    should avoid folks accidentally creating broken runc binaries (and
    incorrectly importing our internal libraries into their projects). (#3331)

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 the following people who made this release possible:

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

v1.1.0-rc.1
55df1fc
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This release is the first release candidate for the next minor release
following runc 1.0. It contains all of the bugfixes included in runc 1.0
patch releases (up to and including 1.0.3).

A fair few new features have been added, and several features have been
deprecated (with plans for removal in runc 1.2). At the moment we only
plan to do a single release candidate for runc 1.1, and once 1.1.0 is
released we will not continue updating the 1.0.z runc branch.

Deprecated:

  • runc run/start now warns if a new container cgroup is non-empty or frozen;
    this warning will become an error in runc 1.2. (#3132, #3223)
  • runc can only be built with Go 1.16 or later from this release onwards.
    (#3100, #3245)

Removed:

  • cgroup.GetHugePageSizes has been removed entirely, and been replaced with
    cgroup.HugePageSizes which is more efficient. (#3234)
  • intelrdt.GetIntelRdtPath has been removed. Users who were using this
    function to get the intelrdt root should use the new intelrdt.Root
    instead. (#2920, #3239)

Added:

  • Add support for RDMA cgroup added in Linux 4.11. (#2883)
  • runc exec now produces exit code of 255 when the exec failed.
    This may help in distinguishing between runc exec failures
    (such as invalid options, non-running container or non-existent
    binary etc.) and failures of the command being executed. (#3073)
  • runc run: new --keep option to skip removal exited containers artefacts.
    This might be useful to check the state (e.g. of cgroup controllers) after
    the container has exited. (#2817, #2825)
  • seccomp: add support for SCMP_ACT_KILL_PROCESS and SCMP_ACT_KILL_THREAD
    (the latter is just an alias for SCMP_ACT_KILL). (#3204)
  • seccomp: add support for SCMP_ACT_NOTIFY (seccomp actions). This allows
    users to create sophisticated seccomp filters where syscalls can be
    efficiently emulated by privileged processes on the host. (#2682)
  • checkpoint/restore: add an option (--lsm-mount-context) to set
    a different LSM mount context on restore. (#3068)
  • runc releases are now cross-compiled for several architectures. Static
    builds for said architectures will be available for all future releases.
    (#3197)
  • intelrdt: support ClosID parameter. (#2920)
  • runc exec --cgroup: an option to specify a (non-top) in-container cgroup
    to use for the process being executed. (#3040, #3059)
  • cgroup v1 controllers now support hybrid hierarchy (i.e. when on a cgroup v1
    machine a cgroup2 filesystem is mounted to /sys/fs/cgroup/unified, runc
    run/exec now adds the container to the appropriate cgroup under it). (#2087,
    #3059)
  • sysctl: allow slashes in sysctl names, to better match sysctl(8)'s
    behaviour. (#3254, #3257)
  • mounts: add support for bind-mounts which are inaccessible after switching
    the user namespace. Note that this does not permit the container any
    additional access to the host filesystem, it simply allows containers to
    have bind-mounts configured for paths the user can access but have
    restrictive access control settings for other users. (#2576)
  • Add support for recursive mount attributes using mount_setattr(2). These
    have the same names as the proposed mount(8) options -- just prepend r
    to the option name (such as rro). (#3272)
  • Add runc features subcommand to allow runc users to detect what features
    runc has been built with. This includes critical information such as
    supported mount flags, hook names, and so on. Note that the output of this
    command is subject to change and will not be considered stable until runc
    1.2 at the earliest. The runtime-spec specification for this feature is
    being developed in opencontainers/runtime-spec#1130. (#3296)

Changed:

  • system: improve performance of /proc/$pid/stat parsing. (#2696)
  • cgroup2: when /sys/fs/cgroup is configured as a read-write mount, change
    the ownership of certain cgroup control files (as per
    /sys/kernel/cgroup/delegate) to allow for proper deferral to the container
    process. (#3057)
  • docs: series of improvements to man pages to make them easier to read and
    use. (#3032)

Libcontainer API:

  • internal api: remove internal error types and handling system, switch to Go
    wrapped errors. (#3033)
  • New configs.Cgroup structure fields (#3177):
    • Systemd (whether to use systemd cgroup manager); and
    • Rootless (whether to use rootless cgroups).
  • New cgroups/manager package aiming to simplify cgroup manager instantiation.
    (#3177)
  • All cgroup managers' instantiation methods now initialize cgroup paths and
    can return errors. This allows to use any cgroup manager method (e.g.
    Exists, Destroy, Set, GetStats) right after instantiation, which was not
    possible before (as paths were initialized in Apply only). (#3178)

Fixed:

  • nsenter: do not try to close already-closed fds during container setup and
    bail on close(2) failures. (#3058)
  • runc checkpoint/restore: fixed for containers with an external bind mount
    which destination is a symlink. (#3047).
  • cgroup: improve openat2 handling for cgroup directory handle hardening.
    (#3030)
  • runc delete -f now succeeds (rather than timing out) on a paused
    container. (#3134)
  • runc run/start/exec now refuses a frozen cgroup (paused container in case of
    exec). Users can disable this using --ignore-paused. (#3132, #3223)
  • config: do not permit null bytes in mount fields. (#3287)

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 the following people who made this release possible:

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

v1.0.3
f46b6ba
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This is the third stable release in the 1.0 branch, fixing a handful of medium
priority issues related to mounts and cgroups, as well as a potential security
vulnerability.

This release is expected to be the last point release in the 1.0 branch, as we
are planning to release runc 1.1 in the near future.

Security:

  • A potential vulnerability was discovered in runc (related to an internal
    usage of netlink), however upon further investigation we discovered that
    while this bug was exploitable on the master branch of runc, no released
    version of runc could be exploited using this bug. The exploit required
    being able to create a netlink attribute with a length that would overflow a
    uint16 but this was not possible in any released version of runc. For more
    information, see GHSA-v95c-p5hm-xq8f and CVE-2021-43784.

    Due to an abundance of caution we decided to do an emergency release with
    this fix, but to reiterate we do not believe this vulnerability was
    possible to exploit
    . Thanks to Felix Wilhelm from Google Project Zero for
    discovering and reporting this vulnerability so quickly.

Bugfixes:

  • Fixed inability to start a container with read-write bind mount of a
    read-only fuse host mount (#3292)
  • Fixed inability to start when read-only /dev in set in spec (#3277)
  • Fixed not removing sub-cgroups upon container delete, when rootless cgroup v2
    is used with older systemd (#3297)
  • Fixed returning error from GetStats when hugetlb is unsupported (which causes
    excessive logging for kubernetes) (#3295)
  • [CI only] Fixed criu 3.16 compatibility issue (#3282)
  • [CI only] Add Go 1.17 to the testing matrix (#3299)

Enhancements:

  • Improved an error message when dbus-user-session is not installed and
    rootless + cgroup2 + systemd are used (#3212)

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 who made this release possible:

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

v1.0.2
52b36a2
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This is the second stable release in the 1.0 branch, fixing a few medium and high
priority issues, including one that affect Kubernetes using runc's libcontainer.

Bugfixes:

  • Fixed a failure to set CPU quota period in some cases on cgroup v1. (#3115)
  • Fixed the inability to start a container with the "adding seccomp filter
    rule for syscall ..." error, caused by redundant seccomp rules (i.e. those
    that has action equal to the default one). Such redundant rules are now
    skipped. (#3129)
  • Made release builds reproducible from now on. (#3142)
  • Fixed a rare debug log race in runc init, which can result in occasional
    harmful "failed to decode ..." errors from runc run or exec. (#3130)
  • Fixed the check in cgroup v1 systemd manager if a container needs to be
    frozen before Set, and add a setting to skip such freeze unconditionally.
    The previous fix for that issue, done in runc 1.0.1, was not working.
    (#3167)

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 who made this release possible:

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

v1.0.1
4144b63
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This is the first stable release in the 1.0 branch, fixing a few medium
and high priority issues with runc 1.0.0, including a few that affect
Kubernetes' usage of libcontainer.

Bugfixes:

  • Fixed occasional runc exec/run failure ("interrupted system call") on an
    Azure volume. (#3074)
  • Fixed "unable to find groups ... token too long" error with /etc/group
    containing lines longer than 64K characters. (#3079)
  • cgroup/systemd/v1: fix leaving cgroup frozen after Set if a parent cgroup is
    frozen. This is a regression in 1.0.0, not affecting runc itself but some
    of libcontainer users (e.g Kubernetes). (#3085)
  • cgroupv2: bpf: Ignore inaccessible existing programs in case of
    permission error when handling replacement of existing bpf cgroup
    programs. This fixes a regression in 1.0.0, where some SELinux
    policies would block runc from being able to run entirely. (#3087)
  • cgroup/systemd/v2: don't freeze cgroup on Set. (#3092)
  • cgroup/systemd/v1: avoid unnecessary freeze on Set. (#3093)

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 who made this release possible:

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

v1.0.0
84113ee
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This release has quite a few last-minute bug-fixes and various correctness and
performance improvements (almost all of which are related to cgroup handling),
and is the first non-rc release of runc in 5 years (v1.0.0-rc1 was released in
2016). It's been a very long road, and we thank the many contributors and
maintainers that helped us get to this point (approximately 422 people in
total).

As runc follows Semantic Versioning, we will endeavor to not make any
breaking changes without bumping the major version number of runc.

However, it should be noted that Go API usage of runc's internal
implementation (libcontainer) is not covered by this policy -- for
historical reasons, this code was not moved into an "internal" package
(this feature did not exist in Go at the time) and because certain
projects currently depend on this, we have not yet moved this code into
an internal package. Despite this, we reserve the right to make breaking
changes in our Go APIs (though we will note such changes in our
changelog, and will try to avoid needless disruption if possible).

Breaking changes:

  • Removed libcontainer/configs.Device* identifiers (deprecated since rc94,
    use libcontainer/devices) (#2999)
  • Removed libcontainer/system.RunningInUserNS function (deprecated since
    rc94, use libcontainer/userns) (#2999)

Deprecations:

  • The usage of relative paths for mountpoints will now produce a warning
    (such configurations are outside of the spec, and in future runc will
    produce an error when given such configurations). (#2917, #3004)

Bugfixes:

  • cgroupv2: devices: rework the filter generation to produce consistent
    results with cgroupv1, and always clobber any existing eBPF
    program(s) to fix runc update and avoid leaking eBPF programs
    (resulting in errors when managing containers). (#2951)
  • cgroupv2: correctly convert "number of IOs" statistics in a
    cgroupv1-compatible way. (#2965, #2967, #2968, #2964)
  • cgroupv2: support larger than 32-bit IO statistics on 32-bit architectures.
  • cgroupv2: wait for freeze to finish before returning from the freezing
    code, optimize the method for checking whether a cgroup is frozen. (#2955)
  • cgroups/systemd: fixed "retry on dbus disconnect" logic introduced in rc94
  • cgroups/systemd: fixed returning "unit already exists" error from a systemd
    cgroup manager (regression in rc94) (#2997, #2996)

Improvements:

  • cgroupv2: support SkipDevices with systemd driver (#2958, #3019)
  • cgroup/systemd: return, not ignore, stop unit error from Destroy (#2946)
  • Fix all golangci-lint failures. (#2781, #2962)
  • Make "runc --version" output sane even when built with go get or
    otherwise outside of our build scripts. (#2962)
  • cgroups: set SkipDevices during runc update (so we don't modify
    cgroups at all during runc update). (#2994)
  • cgroup1: blkio: support BFQ weights. (#3010)
  • cgroupv2: set per-device io weights if BFQ IO scheduler is available.
    (#3022)

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 the following people who made this release possible:

Vote: +5 -0 %2
Signed-off-by: Aleksa Sarai cyphar@cyphar.com

v1.0.0-rc95
b9ee9c6
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This release of runc contains a fix for CVE-2021-30465, and users are
strongly recommended to update (especially if you are providing
semi-limited access to spawn containers to untrusted users).

Aside from this security fix, only a few other changes were made since
v1.0.0-rc94 (the only user-visible change was the addition of support
for defaultErrnoRet in seccomp profiles).

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 the following people who made this release possible:

Due to the nature of this release, it didn't go through the normal
public release procedure. However, this break from procedure was agreed
upon on the security mailing list.

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