Function sys_cap_rights_limit

freebsd/kern/sys_capability.c:269–307

* System call to limit rights of the given capability. */

 * System call to limit rights of the given capability.
 */
int
sys_cap_rights_limit(struct thread *td, struct cap_rights_limit_args *uap)
{
	cap_rights_t rights;
	int error, version;

	cap_rights_init_zero(&rights);

	error = copyin(uap->rightsp, &rights, sizeof(rights.cr_rights[0]));
	if (error != 0)
		return (error);
	version = CAPVER(&rights);
	if (version != CAP_RIGHTS_VERSION_00)
		return (EINVAL);

	error = copyin(uap->rightsp, &rights,
	    sizeof(rights.cr_rights[0]) * CAPARSIZE(&rights));
	if (error != 0)
		return (error);
	/* Check for race. */
	if (CAPVER(&rights) != version)
		return (EINVAL);

	if (!cap_rights_is_valid(&rights))
		return (EINVAL);

	if (version != CAP_RIGHTS_VERSION) {
		rights.cr_rights[0] &= ~(0x3ULL << 62);
		rights.cr_rights[0] |= ((uint64_t)CAP_RIGHTS_VERSION << 62);
	}
#ifdef KTRACE
	if (KTRPOINT(td, KTR_STRUCT))
		ktrcaprights(&rights);
#endif

	AUDIT_ARG_FD(uap->fd);
	AUDIT_ARG_RIGHTS(&rights);
	return (kern_cap_rights_limit(td, uap->fd, &rights));
}

/*
 * System call to query the rights mask associated with a capability.