DRV_PRIV(9F) Kernel Functions for Drivers DRV_PRIV(9F)

NAME

drv_priv - determine driver privilege

SYNOPSIS

#include <sys/types.h>
#include <sys/cred.h>
#include <sys/ddi.h>


int drv_priv(cred_t *cr);

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).

PARAMETERS

cr
Pointer to the user credential structure.

DESCRIPTION

The drv_priv() function provides a general interface to the system
privilege policy. It determines whether the credentials supplied by
the user credential structure pointed to by cr identify a process
that has the {PRIV_SYS_DEVICES} privilege asserted in its effective
set. This function should be used only when file access modes,
special minor device numbers, and the device policy (see
privileges(7), add_drv(8)) are insufficient to provide protection for
the requested driver function. It is intended to replace all calls to
suser() and any explicit checks for effective user ID = 0 in driver
code.

RETURN VALUES

This routine returns 0 if it succeeds, EPERM if it fails.

CONTEXT

The drv_priv() function can be called from user, interrupt, or kernel
context.

SEE ALSO

privileges(7), add_drv(8), update_drv(8)


Writing Device Drivers

January 16, 2006 DRV_PRIV(9F)