NAME
cr_cansee - determine visibility of objects given their user credentials
SYNOPSIS
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ucred.h>
int
cr_cansee(struct ucred *u1, struct ucred *u2);
DESCRIPTION
This function determines the visibility of objects in the kernel based on
the real user IDs and group IDs in the credentials u1 and u2 associated
with them.
The visibility of objects is influenced by the sysctl(8) variables
security.bsd.see_other_gids and security.bsd.see_other_uids, as per the
description in cr_seeothergids(9) and cr_seeotheruids(9) respectively.
RETURN VALUES
This function returns zero if the object with credential u1 can “see” the
object with credential u2, or ESRCH otherwise.
ERRORS
[ESRCH] The object with credential u1 cannot “see” the object
with credential u2.
[ESRCH] The object with credential u1 has been jailed and the
object with credential u2 does not belong to the same
jail as u1.
[ESRCH] The MAC subsystem denied visibility.
SEE ALSO
cr_seeothergids(9), cr_seeotheruids(9), mac(9), p_cansee(9)