Chris Down
8ac16654bc
cgroup_context_apply() attaches the BPF programs again whenever the cgroup is realised again, for example, if someone does set-property or daemon-relaod. As it is now, their installers overwrite the links of the previous installation without freeing them, so the previous programs stay attached until the cgroup is removed, and keep enforcing whatever settings they were loaded with. For example, a unit with SocketBindDeny=any that is allowed to bind to a port with "systemctl set-property foo.service SocketBindAllow=tcp:1234" still cannot do so once its cgroup is realised again, as the previous program keeps denying it. Whoops! To fix this let's free the previous links once the new ones are attached. (cherry picked from commit 2f11fb19b7292339632e9b396fcab12729cde1ff)
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