Function shm_prison_cansee

freebsd/kern/sysv_shm.c:321–330

}

static int
shm_prison_cansee(struct prison *rpr, struct shmid_kernel *shmseg)
{

	if (shmseg->cred == NULL ||
	    !(rpr == shmseg->cred->cr_prison ||
	      prison_ischild(rpr, shmseg->cred->cr_prison)))
		return (EINVAL);
	return (0);
}

static int
kern_shmdt_locked(struct thread *td, const void *shmaddr)