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33 lines
903 B
Markdown
33 lines
903 B
Markdown
# Disallow changes to kernel parameters
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The Sysctl interface allows modifications to kernel parameters at runtime. In a Kubernetes pod these parameters can be specified under `securityContext.sysctls`. Kernel parameter modifications can be used for exploits and should be restricted.
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## Additional Information
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* [List of supported namespaced sysctl interfaces](https://kubernetes.io/docs/tasks/administer-cluster/sysctl-cluster/)
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## Policy YAML
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[disallow_sysctls.yaml](best_practices/disallow_sysctls.yaml)
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````yaml
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apiVersion: kyverno.io/v1
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kind: ClusterPolicy
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metadata:
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name: disallow-sysctls
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spec:
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validationFailureAction: audit
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rules:
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- name: validate-sysctls
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match:
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resources:
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kinds:
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- Pod
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validate:
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message: "Changes to kernel paramaters are not allowed"
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pattern:
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spec:
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securityContext:
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X(sysctls): null
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````
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