235 lines
6.8 KiB
C
235 lines
6.8 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_PRIVCTL
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*
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* The parameters for this kernel call are:
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* m1_i1: PR_ENDPT (process number of caller)
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*/
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#include "../system.h"
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#include "../ipc.h"
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#include <signal.h>
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#include <string.h>
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#if USE_PRIVCTL
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#define FILLED_MASK (~0)
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/*===========================================================================*
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* do_privctl *
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*===========================================================================*/
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PUBLIC int do_privctl(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_privctl(). Update a process' privileges. If the process is not
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* yet a system process, make sure it gets its own privilege structure.
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*/
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register struct proc *caller_ptr;
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register struct proc *rp;
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register struct priv *sp;
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int proc_nr;
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int priv_id;
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int old_flags;
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int i;
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phys_bytes caller_phys, kernel_phys;
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struct io_range io_range;
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struct mem_range mem_range;
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struct priv priv;
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/* Check whether caller is allowed to make this call. Privileged proceses
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* can only update the privileges of processes that are inhibited from
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* running by the NO_PRIV flag. This flag is set when a privileged process
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* forks.
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*/
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caller_ptr = proc_addr(who_p);
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if (! (priv(caller_ptr)->s_flags & SYS_PROC)) return(EPERM);
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if(m_ptr->PR_ENDPT == SELF) proc_nr = who_p;
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else if(!isokendpt(m_ptr->PR_ENDPT, &proc_nr)) return(EINVAL);
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rp = proc_addr(proc_nr);
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switch(m_ptr->CTL_REQUEST)
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{
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case SYS_PRIV_INIT:
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if (! (rp->p_rts_flags & NO_PRIV)) return(EPERM);
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/* Make sure this process has its own privileges structure. This may
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* fail, since there are only a limited number of system processes.
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* Then copy the privileges from the caller and restore some defaults.
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*/
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if ((i=get_priv(rp, SYS_PROC)) != OK) return(i);
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priv_id = priv(rp)->s_id; /* backup privilege id */
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*priv(rp) = *priv(caller_ptr); /* copy from caller */
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priv(rp)->s_id = priv_id; /* restore privilege id */
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priv(rp)->s_proc_nr = proc_nr; /* reassociate process nr */
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for (i=0; i< BITMAP_CHUNKS(NR_SYS_PROCS); i++) /* remove pending: */
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priv(rp)->s_notify_pending.chunk[i] = 0; /* - notifications */
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priv(rp)->s_int_pending = 0; /* - interrupts */
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sigemptyset(&priv(rp)->s_sig_pending); /* - signals */
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/* Now update the process' privileges as requested. */
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rp->p_priv->s_trap_mask = FILLED_MASK;
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for (i=0; i<BITMAP_CHUNKS(NR_SYS_PROCS); i++) {
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rp->p_priv->s_ipc_to.chunk[i] = FILLED_MASK;
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}
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unset_sys_bit(rp->p_priv->s_ipc_to, USER_PRIV_ID);
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/* All process that this process can send to must be able to reply.
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* Therefore, their send masks should be updated as well.
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*/
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for (i=0; i<NR_SYS_PROCS; i++) {
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if (get_sys_bit(rp->p_priv->s_ipc_to, i)) {
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set_sys_bit(priv_addr(i)->s_ipc_to, priv_id(rp));
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}
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}
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/* No I/O resources, no memory resources, no IRQs, no grant table */
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priv(rp)->s_nr_io_range= 0;
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priv(rp)->s_nr_mem_range= 0;
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priv(rp)->s_nr_irq= 0;
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priv(rp)->s_grant_table= 0;
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priv(rp)->s_grant_entries= 0;
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if (m_ptr->CTL_ARG_PTR)
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{
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/* Copy privilege structure from caller */
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caller_phys = umap_local(caller_ptr, D,
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(vir_bytes) m_ptr->CTL_ARG_PTR, sizeof(priv));
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if (caller_phys == 0)
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return EFAULT;
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kernel_phys = vir2phys(&priv);
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phys_copy(caller_phys, kernel_phys, sizeof(priv));
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/* Copy the call mask */
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for (i= 0; i<CALL_MASK_SIZE; i++)
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priv(rp)->s_k_call_mask[i]= priv.s_k_call_mask[i];
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/* Copy IRQs */
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if (priv.s_nr_irq < 0 || priv.s_nr_irq > NR_IRQ)
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return EINVAL;
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priv(rp)->s_nr_irq= priv.s_nr_irq;
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for (i= 0; i<priv.s_nr_irq; i++)
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{
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priv(rp)->s_irq_tab[i]= priv.s_irq_tab[i];
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kprintf("do_privctl: adding IRQ %d\n",
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priv(rp)->s_irq_tab[i]);
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}
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priv(rp)->s_flags |= CHECK_IRQ; /* Check requests for IRQs */
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/* Copy I/O ranges */
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if (priv.s_nr_io_range < 0 || priv.s_nr_io_range > NR_IO_RANGE)
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return EINVAL;
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priv(rp)->s_nr_io_range= priv.s_nr_io_range;
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for (i= 0; i<priv.s_nr_io_range; i++)
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{
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priv(rp)->s_io_tab[i]= priv.s_io_tab[i];
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kprintf("do_privctl: adding I/O range [%x..%x]\n",
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priv(rp)->s_io_tab[i].ior_base,
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priv(rp)->s_io_tab[i].ior_limit);
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}
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/* Check requests for IRQs */
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priv(rp)->s_flags |= CHECK_IO_PORT;
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memcpy(priv(rp)->s_k_call_mask, priv.s_k_call_mask,
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sizeof(priv(rp)->s_k_call_mask));
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}
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/* Done. Privileges have been set. Allow process to run again. */
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old_flags = rp->p_rts_flags; /* save value of the flags */
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rp->p_rts_flags &= ~NO_PRIV;
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if (old_flags != 0 && rp->p_rts_flags == 0) lock_enqueue(rp);
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return(OK);
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case SYS_PRIV_USER:
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if (! (rp->p_rts_flags & NO_PRIV)) return(EPERM);
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/* Make this process an ordinary user process.
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*/
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if ((i=get_priv(rp, 0)) != OK) return(i);
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/* Done. Privileges have been set. Allow process to run again. */
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old_flags = rp->p_rts_flags; /* save value of the flags */
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rp->p_rts_flags &= ~NO_PRIV;
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if (old_flags != 0 && rp->p_rts_flags == 0) lock_enqueue(rp);
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return(OK);
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case SYS_PRIV_ADD_IO:
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if (rp->p_rts_flags & NO_PRIV)
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return(EPERM);
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/* Only system processes get I/O resources? */
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if (!(priv(rp)->s_flags & SYS_PROC))
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return EPERM;
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/* Get the I/O range */
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caller_phys = umap_local(caller_ptr, D, (vir_bytes) m_ptr->CTL_ARG_PTR,
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sizeof(io_range));
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if (caller_phys == 0)
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return EFAULT;
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kernel_phys = vir2phys(&io_range);
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phys_copy(caller_phys, kernel_phys, sizeof(io_range));
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priv(rp)->s_flags |= CHECK_IO_PORT; /* Check I/O accesses */
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i= priv(rp)->s_nr_io_range;
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if (i >= NR_IO_RANGE)
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return ENOMEM;
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priv(rp)->s_io_tab[i].ior_base= io_range.ior_base;
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priv(rp)->s_io_tab[i].ior_limit= io_range.ior_limit;
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priv(rp)->s_nr_io_range++;
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return OK;
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case SYS_PRIV_ADD_MEM:
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if (rp->p_rts_flags & NO_PRIV)
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return(EPERM);
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/* Only system processes get memory resources? */
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if (!(priv(rp)->s_flags & SYS_PROC))
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return EPERM;
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/* Get the memory range */
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caller_phys = umap_local(caller_ptr, D, (vir_bytes) m_ptr->CTL_ARG_PTR,
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sizeof(mem_range));
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if (caller_phys == 0)
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return EFAULT;
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kernel_phys = vir2phys(&mem_range);
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phys_copy(caller_phys, kernel_phys, sizeof(mem_range));
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priv(rp)->s_flags |= CHECK_MEM; /* Check I/O accesses */
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i= priv(rp)->s_nr_mem_range;
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if (i >= NR_MEM_RANGE)
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return ENOMEM;
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#if 0
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priv(rp)->s_mem_tab[i].mr_base= mem_range.mr_base;
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priv(rp)->s_mem_tab[i].mr_limit= mem_range.mr_limit;
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priv(rp)->s_nr_mem_range++;
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#endif
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return OK;
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case SYS_PRIV_ADD_IRQ:
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if (rp->p_rts_flags & NO_PRIV)
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return(EPERM);
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/* Only system processes get IRQs? */
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if (!(priv(rp)->s_flags & SYS_PROC))
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return EPERM;
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priv(rp)->s_flags |= CHECK_IRQ; /* Check IRQs */
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i= priv(rp)->s_nr_irq;
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if (i >= NR_IRQ)
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return ENOMEM;
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priv(rp)->s_irq_tab[i]= m_ptr->CTL_MM_PRIV;
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priv(rp)->s_nr_irq++;
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return OK;
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default:
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kprintf("do_privctl: bad request %d\n", m_ptr->CTL_REQUEST);
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return EINVAL;
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}
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}
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#endif /* USE_PRIVCTL */
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