CR_CANSEEJAILPROC(9)   FreeBSD Kernel Developer's Manual  CR_CANSEEJAILPROC(9)

NAME

     cr_canseejailproc - determine if subjects may see entities in sub-jails

SYNOPSIS

     int
     cr_canseejailproc(struct ucred *u1, struct ucred *u2);

DESCRIPTION

     This function is internal.  Its functionality is integrated into the
     function cr_bsd_visible(9), which should be called instead.

     This function checks if a subject associated to credentials u1 is denied
     seeing a subject or object associated to credentials u2 by a policy that
     requires both credentials to be associated to the same jail.  This is a
     restriction to the baseline jail policy that a subject can see subjects
     or objects in its own jail or any sub-jail of it.

     This policy is active if and only if the sysctl(8) variable
     security.bsd.see_jail_proc is set to zero.

     As usual, the superuser (effective user ID 0) is exempt from this policy
     provided that the sysctl(8) variable security.bsd.suser_enabled is non-
     zero and no active MAC policy explicitly denies the exemption (see
     priv_check_cred(9)).

RETURN VALUES

     The cr_canseejailproc() function returns 0 if the policy is disabled,
     both credentials are associated to the same jail, or if u1 has privilege
     exempting it from the policy.  Otherwise, it returns ESRCH.

SEE ALSO

     cr_bsd_visible(9), priv_check_cred(9)

AUTHORS

     This manual page was written by Olivier Certner
     <olce.freebsd@certner.fr>.

FreeBSD 15.1-STABLE-HBSD        August 18, 2023           CR_CANSEEJAILPROC(9)