Linkerd - stable-2.11.4

stable-2.11.4

This release includes a security improvement. When a user manually specified the
policyValidator.keyPEM setting, the value was incorrectly included in the
linkerd-config ConfigMap. This means that this private key was erroneously
exposed to ServiceAccounts with read access to this ConfigMap. Practically, this
means that the Linkerd proxy-injector, identity, and heartbeat Pods could
read this value. This should not have exposed this private key to other
unauthorized users unless additional RoleBindings were added outside of Linkerd.
Nevertheless, we recommend that users who manually set control plane
certificates update the credentials for the policy validator after upgrading
Linkerd.

Additionally, a PodSecurityPolicy fix is included which fixes installations
where PSP is enabled and proxyInit.runAsRoot: true.