At the BSDCan tutorial last week on jails (and several other times) there was discussion regarding Postgres's use of system V style shared memory, and an unfortunate side effect of making jail() less secure. Specifically, to allow Postgres to operate in a jail()ed environment, the sysctl : jail.sysvipc_allowed=1 has to be set. This allows ALL jails to access the memory, at the least leaving Postgres open to attack, at the worst allowing a door into who knows what security breach. Question : is there any way to run Postgres securely in a jail?
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