securelevel_gt(9) [freebsd man page]

SECURELEVEL_GT(9)					   BSD Kernel Developer's Manual					 SECURELEVEL_GT(9)

NAME

     securelevel_gt, securelevel_ge -- test active securelevel

SYNOPSIS

     #include <sys/types.h>
     #include <sys/proc.h>

     int
     securelevel_gt(struct ucred *cr, int level);

     int
     securelevel_ge(struct ucred *cr, int level);

DESCRIPTION

     These functions test the active security level against the given level.  If the calling credential cr was imprisoned by the jail(2) system
     call, and has a different security level set than the host environment, the security level with the highest value is used.

     The securelevel_gt() function will evaluate whether or not the active security level is greater than the supplied level.

     The securelevel_ge() function will evaluate whether or not the active security level is greater than or equal to the supplied level.

RETURN VALUES

     These functions return EPERM if condition evaluated to true, and 0 otherwise.

SEE ALSO

     securelevel(7)

BSD
								   June 2, 2007 							       BSD

CR_SEEOTHERGIDS(9)					   BSD Kernel Developer's Manual					CR_SEEOTHERGIDS(9)

NAME

     cr_seeothergids -- determine visibility of objects given their group memberships

SYNOPSIS

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

DESCRIPTION

     This function determines the visibility of objects in the kernel based on the group IDs in the credentials u1 and u2 associated with them.

     The visibility of objects is influenced by the sysctl(8) variable security.bsd.see_other_gids.  If this variable is non-zero then all objects
     in the kernel are visible to each other irrespective of their group membership.  If this variable is zero then the object with credentials u2
     is visible to the object with credentials u1 if either u1 is the super-user credential, or if at least one of u1's group IDs is present in
     u2's group set.

SYSCTL VARIABLES

     security.bsd.see_other_gids
	     Must be non-zero if objects with unprivileged credentials are to be able to see each other.

RETURN VALUES

     This function returns zero if the object with credential u1 can ``see'' the object with credential u2, or ESRCH otherwise.

SEE ALSO

     cr_seeotheruids(9), p_candebug(9)

BSD
								 November 11, 2003							       BSD