minix/kernel/system/do_privctl.c

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2005-07-22 11:20:43 +02:00
/* The system call implemented in this file:
* m_type: SYS_PRIVCTL
*
* The parameters for this system call are:
* m2_i1: CTL_PROC_NR (process number of caller)
*/
#include "../system.h"
#include "../ipc.h"
#if USE_PRIVCTL
/*===========================================================================*
* 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 *rp;
register struct priv *sp;
int proc_nr;
int i;
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/* Extract message parameters. */
proc_nr = m_ptr->CTL_PROC_NR;
if (proc_nr == SELF) proc_nr = m_ptr->m_source;
if (! isokprocn(proc_nr)) return(EINVAL);
rp = proc_addr(proc_nr);
/* Make sure this process has its own privileges structure. */
if (! (priv(rp)->s_flags & SYS_PROC))
get_priv(rp, SYS_PROC);
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/* Now update the process' privileges as requested. */
rp->p_priv->s_call_mask = FILLED_MASK;
for (i=0; i<BITMAP_CHUNKS(NR_SYS_PROCS); i++) {
rp->p_priv->s_send_mask.chunk[i] = FILLED_MASK;
}
unset_sys_bit(rp->p_priv->s_send_mask, 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_send_mask, i)) {
set_sys_bit(priv_addr(i)->s_send_mask, priv_id(rp));
}
}
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return(OK);
}
#endif /* USE_PRIVCTL */