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genpolicy: ignore groups with same name as user

Browse Source 
containerd does not automatically add groups to the list of additional
GIDs when the groups have the same name as the user:

https://github.com/containerd/containerd/blob/f482992/pkg/oci/spec_opts.go#L852-L854

This is a bug and should be corrected, but it has been present since at
least 1.6.0 and thus affects almost all containerd deployments in
existence. Thus, we adopt the same behavior and ignore groups with the
same name as the user when calculating additional GIDs.

Signed-off-by: Markus Rudy <mr@edgeless.systems>
This commit is contained in:
Markus Rudy 2025-06-03 17:54:44 +02:00
parent eeb3d1384b
commit a1baaf6fe2
4 changed files with 689 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/tools/genpolicy/src/registry.rs
View File

@ -271,7 +271,9 @@ impl Container {
record.user_list.iter().for_each(|u| {
match self.get_uid_gid_from_passwd_user(u.to_string()) {
Ok((record_uid, _)) => {
if record_uid == uid {
if record_uid == uid && &record.name != u {
// The second condition works around containerd bug
// https://github.com/containerd/containerd/issues/11937.
groups.push(record.gid);
}
},

5
src/tools/genpolicy/tests/policy/main.rs
View File

@ -233,6 +233,11 @@ mod tests {
runtests("createcontainer/generate_name").await;
}
#[tokio::test]
async fn test_create_container_gid() {
runtests("createcontainer/gid").await;
}
#[tokio::test]
async fn test_state_create_container() {
runtests("state/createcontainer").await;

12
src/tools/genpolicy/tests/policy/testdata/createcontainer/gid/pod.yaml vendored Normal file
View File

@ -0,0 +1,12 @@
---
apiVersion: v1
kind: Pod
metadata:
name: gid-experiment
labels:
app: gid-experiment
spec:
runtimeClassName: kata-cc-isolation
containers:
- name: gid
image: "ghcr.io/burgerdev/weird-images/gid:latest@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0"

669
src/tools/genpolicy/tests/policy/testdata/createcontainer/gid/testcases.json vendored Normal file
View File

@ -0,0 +1,669 @@
[
{
"description": "image with unusual group setup, see https://github.com/burgerdev/weird-images/tree/74b32e2/src/gid",
"allowed": true,
"request": {
"type": "CreateContainer",
"OCI": {
"Annotations": {
"io.katacontainers.pkg.oci.bundle_path": "/run/containerd/io.containerd.runtime.v2.task/k8s.io/gid",
"io.katacontainers.pkg.oci.container_type": "pod_container",
"io.kubernetes.cri.container-name": "gid",
"io.kubernetes.cri.container-type": "container",
"io.kubernetes.cri.image-name": "ghcr.io/burgerdev/weird-images/gid@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0",
"io.kubernetes.cri.sandbox-id": "8667fea11fc4fc70d427cc3645950ac83cc7d33ca515a8774ab95043f0096bb8",
"io.kubernetes.cri.sandbox-name": "gid-experiment",
"io.kubernetes.cri.sandbox-namespace": "default",
"io.kubernetes.cri.sandbox-uid": "31df313a-931f-4979-a405-cc3f3ccb6a56"
},
"Hooks": null,
"Hostname": "",
"Linux": {
"CgroupsPath": "kubepods-burstable-pod31df313a_931f_4979_a405_cc3f3ccb6a56.slice:cri-containerd:gid",
"Devices": [],
"GIDMappings": [],
"IntelRdt": null,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware",
"/sys/devices/virtual/powercap"
],
"MountLabel": "",
"Namespaces": [
{
"Path": "",
"Type": "ipc"
},
{
"Path": "",
"Type": "uts"
},
{
"Path": "",
"Type": "mount"
}
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
],
"Resources": {
"BlockIO": null,
"CPU": {
"Cpus": "",
"Mems": "",
"Period": 100000,
"Quota": 0,
"RealtimePeriod": 0,
"RealtimeRuntime": 0,
"Shares": 2
},
"Devices": [],
"HugepageLimits": [],
"Memory": {
"DisableOOMKiller": false,
"Kernel": 0,
"KernelTCP": 0,
"Limit": 0,
"Reservation": 0,
"Swap": 0,
"Swappiness": 0
},
"Network": null,
"Pids": null
},
"RootfsPropagation": "",
"Seccomp": null,
"Sysctl": {},
"UIDMappings": []
},
"Mounts": [
{
"destination": "/proc",
"options": [
"nosuid",
"noexec",
"nodev"
],
"source": "proc",
"type_": "proc"
},
{
"destination": "/dev",
"options": [
"nosuid",
"strictatime",
"mode=755",
"size=65536k"
],
"source": "tmpfs",
"type_": "tmpfs"
},
{
"destination": "/dev/pts",
"options": [
"nosuid",
"noexec",
"newinstance",
"ptmxmode=0666",
"mode=0620",
"gid=5"
],
"source": "devpts",
"type_": "devpts"
},
{
"destination": "/dev/mqueue",
"options": [
"nosuid",
"noexec",
"nodev"
],
"source": "mqueue",
"type_": "mqueue"
},
{
"destination": "/sys",
"options": [
"nosuid",
"noexec",
"nodev",
"ro"
],
"source": "sysfs",
"type_": "sysfs"
},
{
"destination": "/sys/fs/cgroup",
"options": [
"nosuid",
"noexec",
"nodev",
"relatime",
"ro"
],
"source": "cgroup",
"type_": "cgroup"
},
{
"destination": "/etc/hosts",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-4a4c20d48254d738-hosts",
"type_": "bind"
},
{
"destination": "/dev/termination-log",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-72cfcc0e64a0d1af-termination-log",
"type_": "bind"
},
{
"destination": "/etc/hostname",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-89f0faae823d569c-hostname",
"type_": "bind"
},
{
"destination": "/etc/resolv.conf",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-8c0d97703dbbb30e-resolv.conf",
"type_": "bind"
},
{
"destination": "/dev/shm",
"options": [
"rbind"
],
"source": "/run/kata-containers/sandbox/shm",
"type_": "bind"
},
{
"destination": "/var/run/secrets/kubernetes.io/serviceaccount",
"options": [
"rbind",
"rprivate",
"ro"
],
"source": "/run/kata-containers/shared/containers/gid-be44d3a46e427870-serviceaccount",
"type_": "bind"
}
],
"Process": {
"ApparmorProfile": "cri-containerd.apparmor.d",
"Args": [
"/entrypoint.sh"
],
"Capabilities": {
"Ambient": [],
"Bounding": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE"
],
"Effective": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE"
],
"Inheritable": [],
"Permitted": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE"
]
},
"ConsoleSize": null,
"Cwd": "/",
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"HOSTNAME=gid-experiment",
"KUBERNETES_PORT_443_TCP=tcp://10.0.0.1:443",
"KUBERNETES_PORT_443_TCP_PROTO=tcp",
"KUBERNETES_PORT_443_TCP_PORT=443",
"KUBERNETES_PORT_443_TCP_ADDR=10.0.0.1",
"KUBERNETES_SERVICE_HOST=10.0.0.1",
"KUBERNETES_SERVICE_PORT=443",
"KUBERNETES_SERVICE_PORT_HTTPS=443",
"KUBERNETES_PORT=tcp://10.0.0.1:443"
],
"NoNewPrivileges": false,
"OOMScoreAdj": 994,
"Rlimits": [],
"SelinuxLabel": "",
"Terminal": false,
"User": {
"AdditionalGids": [
1
],
"GID": 1,
"UID": 2,
"Username": ""
}
},
"Root": {
"Path": "/run/kata-containers/shared/containers/gid/rootfs",
"Readonly": false
},
"Solaris": null,
"Version": "1.1.0",
"Windows": null
},
"container_id": "gid",
"devices": [],
"exec_id": "gid",
"sandbox_pidns": false,
"shared_mounts": [],
"stderr_port": 0,
"stdin_port": 0,
"stdout_port": 0,
"storages": [
{
"driver": "image_guest_pull",
"driver_options": [
"image_guest_pull={\"metadata\":{\"io.katacontainers.pkg.oci.bundle_path\":\"/run/containerd/io.containerd.runtime.v2.task/k8s.io/gid\",\"io.katacontainers.pkg.oci.container_type\":\"pod_container\",\"io.kubernetes.cri.container-name\":\"gid\",\"io.kubernetes.cri.container-type\":\"container\",\"io.kubernetes.cri.image-name\":\"ghcr.io/burgerdev/weird-images/gid@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0\",\"io.kubernetes.cri.sandbox-id\":\"8667fea11fc4fc70d427cc3645950ac83cc7d33ca515a8774ab95043f0096bb8\",\"io.kubernetes.cri.sandbox-name\":\"gid-experiment\",\"io.kubernetes.cri.sandbox-namespace\":\"default\",\"io.kubernetes.cri.sandbox-uid\":\"31df313a-931f-4979-a405-cc3f3ccb6a56\"}}"
],
"fs_group": null,
"fstype": "overlay",
"mount_point": "/run/kata-containers/gid/rootfs",
"options": [],
"source": "ghcr.io/burgerdev/weird-images/gid@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0"
}
],
"string_user": null
}
},
{
"description": "image with unusual group setup, but bad additional group",
"allowed": false,
"request": {
"type": "CreateContainer",
"OCI": {
"Annotations": {
"io.katacontainers.pkg.oci.bundle_path": "/run/containerd/io.containerd.runtime.v2.task/k8s.io/gid",
"io.katacontainers.pkg.oci.container_type": "pod_container",
"io.kubernetes.cri.container-name": "gid",
"io.kubernetes.cri.container-type": "container",
"io.kubernetes.cri.image-name": "ghcr.io/burgerdev/weird-images/gid@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0",
"io.kubernetes.cri.sandbox-id": "8667fea11fc4fc70d427cc3645950ac83cc7d33ca515a8774ab95043f0096bb8",
"io.kubernetes.cri.sandbox-name": "gid-experiment",
"io.kubernetes.cri.sandbox-namespace": "default",
"io.kubernetes.cri.sandbox-uid": "31df313a-931f-4979-a405-cc3f3ccb6a56"
},
"Hooks": null,
"Hostname": "",
"Linux": {
"CgroupsPath": "kubepods-burstable-pod31df313a_931f_4979_a405_cc3f3ccb6a56.slice:cri-containerd:gid",
"Devices": [],
"GIDMappings": [],
"IntelRdt": null,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware",
"/sys/devices/virtual/powercap"
],
"MountLabel": "",
"Namespaces": [
{
"Path": "",
"Type": "ipc"
},
{
"Path": "",
"Type": "uts"
},
{
"Path": "",
"Type": "mount"
}
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
],
"Resources": {
"BlockIO": null,
"CPU": {
"Cpus": "",
"Mems": "",
"Period": 100000,
"Quota": 0,
"RealtimePeriod": 0,
"RealtimeRuntime": 0,
"Shares": 2
},
"Devices": [],
"HugepageLimits": [],
"Memory": {
"DisableOOMKiller": false,
"Kernel": 0,
"KernelTCP": 0,
"Limit": 0,
"Reservation": 0,
"Swap": 0,
"Swappiness": 0
},
"Network": null,
"Pids": null
},
"RootfsPropagation": "",
"Seccomp": null,
"Sysctl": {},
"UIDMappings": []
},
"Mounts": [
{
"destination": "/proc",
"options": [
"nosuid",
"noexec",
"nodev"
],
"source": "proc",
"type_": "proc"
},
{
"destination": "/dev",
"options": [
"nosuid",
"strictatime",
"mode=755",
"size=65536k"
],
"source": "tmpfs",
"type_": "tmpfs"
},
{
"destination": "/dev/pts",
"options": [
"nosuid",
"noexec",
"newinstance",
"ptmxmode=0666",
"mode=0620",
"gid=5"
],
"source": "devpts",
"type_": "devpts"
},
{
"destination": "/dev/mqueue",
"options": [
"nosuid",
"noexec",
"nodev"
],
"source": "mqueue",
"type_": "mqueue"
},
{
"destination": "/sys",
"options": [
"nosuid",
"noexec",
"nodev",
"ro"
],
"source": "sysfs",
"type_": "sysfs"
},
{
"destination": "/sys/fs/cgroup",
"options": [
"nosuid",
"noexec",
"nodev",
"relatime",
"ro"
],
"source": "cgroup",
"type_": "cgroup"
},
{
"destination": "/etc/hosts",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-4a4c20d48254d738-hosts",
"type_": "bind"
},
{
"destination": "/dev/termination-log",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-72cfcc0e64a0d1af-termination-log",
"type_": "bind"
},
{
"destination": "/etc/hostname",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-89f0faae823d569c-hostname",
"type_": "bind"
},
{
"destination": "/etc/resolv.conf",
"options": [
"rbind",
"rprivate",
"rw"
],
"source": "/run/kata-containers/shared/containers/gid-8c0d97703dbbb30e-resolv.conf",
"type_": "bind"
},
{
"destination": "/dev/shm",
"options": [
"rbind"
],
"source": "/run/kata-containers/sandbox/shm",
"type_": "bind"
},
{
"destination": "/var/run/secrets/kubernetes.io/serviceaccount",
"options": [
"rbind",
"rprivate",
"ro"
],
"source": "/run/kata-containers/shared/containers/gid-be44d3a46e427870-serviceaccount",
"type_": "bind"
}
],
"Process": {
"ApparmorProfile": "cri-containerd.apparmor.d",
"Args": [
"/entrypoint.sh"
],
"Capabilities": {
"Ambient": [],
"Bounding": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE"
],
"Effective": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE"
],
"Inheritable": [],
"Permitted": [
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FSETID",
"CAP_FOWNER",
"CAP_MKNOD",
"CAP_NET_RAW",
"CAP_SETGID",
"CAP_SETUID",
"CAP_SETFCAP",
"CAP_SETPCAP",
"CAP_NET_BIND_SERVICE",
"CAP_SYS_CHROOT",
"CAP_KILL",
"CAP_AUDIT_WRITE"
]
},
"ConsoleSize": null,
"Cwd": "/",
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"HOSTNAME=gid-experiment",
"KUBERNETES_PORT_443_TCP=tcp://10.0.0.1:443",
"KUBERNETES_PORT_443_TCP_PROTO=tcp",
"KUBERNETES_PORT_443_TCP_PORT=443",
"KUBERNETES_PORT_443_TCP_ADDR=10.0.0.1",
"KUBERNETES_SERVICE_HOST=10.0.0.1",
"KUBERNETES_SERVICE_PORT=443",
"KUBERNETES_SERVICE_PORT_HTTPS=443",
"KUBERNETES_PORT=tcp://10.0.0.1:443"
],
"NoNewPrivileges": false,
"OOMScoreAdj": 994,
"Rlimits": [],
"SelinuxLabel": "",
"Terminal": false,
"User": {
"AdditionalGids": [
1,
123
],
"GID": 1,
"UID": 2,
"Username": ""
}
},
"Root": {
"Path": "/run/kata-containers/shared/containers/gid/rootfs",
"Readonly": false
},
"Solaris": null,
"Version": "1.1.0",
"Windows": null
},
"container_id": "gid",
"devices": [],
"exec_id": "gid",
"sandbox_pidns": false,
"shared_mounts": [],
"stderr_port": 0,
"stdin_port": 0,
"stdout_port": 0,
"storages": [
{
"driver": "image_guest_pull",
"driver_options": [
"image_guest_pull={\"metadata\":{\"io.katacontainers.pkg.oci.bundle_path\":\"/run/containerd/io.containerd.runtime.v2.task/k8s.io/gid\",\"io.katacontainers.pkg.oci.container_type\":\"pod_container\",\"io.kubernetes.cri.container-name\":\"gid\",\"io.kubernetes.cri.container-type\":\"container\",\"io.kubernetes.cri.image-name\":\"ghcr.io/burgerdev/weird-images/gid@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0\",\"io.kubernetes.cri.sandbox-id\":\"8667fea11fc4fc70d427cc3645950ac83cc7d33ca515a8774ab95043f0096bb8\",\"io.kubernetes.cri.sandbox-name\":\"gid-experiment\",\"io.kubernetes.cri.sandbox-namespace\":\"default\",\"io.kubernetes.cri.sandbox-uid\":\"31df313a-931f-4979-a405-cc3f3ccb6a56\"}}"
],
"fs_group": null,
"fstype": "overlay",
"mount_point": "/run/kata-containers/gid/rootfs",
"options": [],
"source": "ghcr.io/burgerdev/weird-images/gid@sha256:bdbb485bb9e3baf381a2957b9369b6051c6113097a5f8dcee27faff17624a2c0"
}
],
"string_user": null
}
}
]