85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/* The system call implemented in this file:
|
|
* m_type: SYS_PRIVCTL
|
|
*
|
|
* The parameters for this system call are:
|
|
* m1_i1: PR_PROC_NR (process number of caller)
|
|
*/
|
|
|
|
#include "../system.h"
|
|
#include "../ipc.h"
|
|
#include <signal.h>
|
|
|
|
#if USE_PRIVCTL
|
|
|
|
#define FILLED_MASK (~0)
|
|
|
|
/*===========================================================================*
|
|
* do_privctl *
|
|
*===========================================================================*/
|
|
PUBLIC int do_privctl(m_ptr)
|
|
message *m_ptr; /* pointer to request message */
|
|
{
|
|
/* Handle sys_privctl(). Update a process' privileges. If the process is not
|
|
* yet a system process, make sure it gets its own privilege structure.
|
|
*/
|
|
register struct proc *caller_ptr;
|
|
register struct proc *rp;
|
|
register struct priv *sp;
|
|
int proc_nr;
|
|
int priv_id;
|
|
int old_flags;
|
|
int i;
|
|
|
|
/* Check whether caller is allowed to make this call. Privileged proceses
|
|
* can only update the privileges of processes that are inhibited from
|
|
* running by the NO_PRIV flag. This flag is set when a privileged process
|
|
* forks.
|
|
*/
|
|
caller_ptr = proc_addr(m_ptr->m_source);
|
|
if (! (priv(caller_ptr)->s_flags & SYS_PROC)) return(EPERM);
|
|
proc_nr = m_ptr->PR_PROC_NR;
|
|
if (! isokprocn(proc_nr)) return(EINVAL);
|
|
rp = proc_addr(proc_nr);
|
|
if (! (rp->p_rts_flags & NO_PRIV)) return(EPERM);
|
|
|
|
/* Make sure this process has its own privileges structure. This may fail,
|
|
* since there are only a limited number of system processes. Then copy the
|
|
* privileges from the caller and restore some defaults.
|
|
*/
|
|
if ((i=get_priv(rp, SYS_PROC)) != OK) return(i);
|
|
priv_id = priv(rp)->s_id; /* backup privilege id */
|
|
*priv(rp) = *priv(caller_ptr); /* copy from caller */
|
|
priv(rp)->s_id = priv_id; /* restore privilege id */
|
|
priv(rp)->s_proc_nr = proc_nr; /* reassociate process nr */
|
|
|
|
for (i=0; i< BITMAP_CHUNKS(NR_SYS_PROCS); i++) /* remove pending: */
|
|
priv(rp)->s_notify_pending.chunk[i] = 0; /* - notifications */
|
|
priv(rp)->s_int_pending = 0; /* - interrupts */
|
|
sigemptyset(&priv(rp)->s_sig_pending); /* - signals */
|
|
|
|
/* Now update the process' privileges as requested. */
|
|
rp->p_priv->s_trap_mask = FILLED_MASK;
|
|
for (i=0; i<BITMAP_CHUNKS(NR_SYS_PROCS); i++) {
|
|
rp->p_priv->s_ipc_to.chunk[i] = FILLED_MASK;
|
|
}
|
|
unset_sys_bit(rp->p_priv->s_ipc_to, USER_PRIV_ID);
|
|
|
|
/* All process that this process can send to must be able to reply.
|
|
* Therefore, their send masks should be updated as well.
|
|
*/
|
|
for (i=0; i<NR_SYS_PROCS; i++) {
|
|
if (get_sys_bit(rp->p_priv->s_ipc_to, i)) {
|
|
set_sys_bit(priv_addr(i)->s_ipc_to, priv_id(rp));
|
|
}
|
|
}
|
|
|
|
/* Done. Privileges have been set. Allow process to run again. */
|
|
old_flags = rp->p_rts_flags; /* save value of the flags */
|
|
rp->p_rts_flags &= ~NO_PRIV;
|
|
if (old_flags != 0 && rp->p_rts_flags == 0) lock_enqueue(rp);
|
|
return(OK);
|
|
}
|
|
|
|
#endif /* USE_PRIVCTL */
|
|
|