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Now that all of the infrastructure for devices.Emulator is in place, we can finally implement minimal transition rules for devices cgroups. This allows for minimal disruption to running containers if a rule update is requested. Only in very rare circumstances (black-list cgroups and mode switching) will a clear-all rule be written. As a result, containers should no longer see spurious errors. A similar issue affects the cgroupv2 devices setup, but that is a topic for another time (as the solution is drastically different). Signed-off-by: Aleksa Sarai <asarai@suse.de>
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
// +build linux
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package fs
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import (
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"testing"
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"github.com/opencontainers/runc/libcontainer/cgroups/fscommon"
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"github.com/opencontainers/runc/libcontainer/configs"
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)
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func TestDevicesSetAllow(t *testing.T) {
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helper := NewCgroupTestUtil("devices", t)
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defer helper.cleanup()
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helper.writeFileContents(map[string]string{
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"devices.allow": "",
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"devices.deny": "",
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"devices.list": "a *:* rwm",
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})
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helper.CgroupData.config.Resources.Devices = []*configs.DeviceRule{
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{
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Type: configs.CharDevice,
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Major: 1,
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Minor: 5,
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Permissions: configs.DevicePermissions("rwm"),
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Allow: true,
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},
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}
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devices := &DevicesGroup{testingSkipFinalCheck: true}
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if err := devices.Set(helper.CgroupPath, helper.CgroupData.config); err != nil {
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t.Fatal(err)
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}
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// The default deny rule must be written.
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value, err := fscommon.GetCgroupParamString(helper.CgroupPath, "devices.deny")
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if err != nil {
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t.Fatalf("Failed to parse devices.deny: %s", err)
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}
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if value[0] != 'a' {
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t.Errorf("Got the wrong value (%q), set devices.deny failed.", value)
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}
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// Permitted rule must be written.
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if value, err := fscommon.GetCgroupParamString(helper.CgroupPath, "devices.allow"); err != nil {
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t.Fatalf("Failed to parse devices.allow: %s", err)
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} else if value != "c 1:5 rwm" {
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t.Errorf("Got the wrong value (%q), set devices.allow failed.", value)
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}
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}
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