84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/* The system 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 system call are:
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* m1_i1: PR_PROC_NR (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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#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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/* 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(m_ptr->m_source);
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if (! (priv(caller_ptr)->s_flags & SYS_PROC)) return(EPERM);
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proc_nr = m_ptr->PR_PROC_NR;
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if (! isokprocn(proc_nr)) return(EINVAL);
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rp = proc_addr(proc_nr);
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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 fail,
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* since there are only a limited number of system processes. Then copy the
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* 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 privileges */
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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_call_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_send_mask.chunk[i] = FILLED_MASK;
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}
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unset_sys_bit(rp->p_priv->s_send_mask, 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_send_mask, i)) {
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set_sys_bit(priv_addr(i)->s_send_mask, priv_id(rp));
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}
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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_ready(rp);
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return(OK);
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}
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#endif /* USE_PRIVCTL */
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