Zbigniew Jędrzejewski-Szmek
df1cbd1adf
For the system manager, /run/systemd/private is publicly accessible, because /run/systemd is 0755, and /run/systemd/private is 0777. For the user manager, /run/user/<uid> is 0700, and /run/user/<uid>/systemd/private is 0777. This does not directly cause any security issue because we check the sender in bus_check_peercred (ucred.uid != 0 && ucred.uid != geteuid()). But it makes sense to limit access to the socket to avoid wasting time in PID1. Somebody could send messages there that'd we'd reject anyway. It also makes things more explicit.
System and Service Manager
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