security.bsd.see_other_uids for jails

Anatoli Klassen anatoli at
Sun May 28 07:39:41 PDT 2006

joerg at wrote:
> On Sun, May 28, 2006 at 03:46:06PM +0200, Anatoli Klassen wrote:
>> Hi All,
>> if security.bsd.see_other_uids is set to 0, users from the main system 
>> can still see processes from jails if they have (by accident) the save uid.
>> For me it's wrong behavior because the main system and the jail are two 
>> different systems where uids are independent.
> Sorry but you have far bigger security problems if you create such a
> setup. E.g. "users" from the outer system can ptrace the processes in
> the jail with the same uid.

But ptrace uses the same function p_cansee for security check.

Does it mean than "outer" user is more privileged as "jailed" root? Is 
it intended?


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