minix/servers/pm/getset.c
2009-10-31 14:09:28 +00:00

114 lines
2.5 KiB
C

/* This file handles the 6 system calls that get and set uids and gids.
* It also handles getpid(), setsid(), and getpgrp(). The code for each
* one is so tiny that it hardly seemed worthwhile to make each a separate
* function.
*/
#include "pm.h"
#include <minix/callnr.h>
#include <minix/endpoint.h>
#include <minix/com.h>
#include <signal.h>
#include "mproc.h"
#include "param.h"
/*===========================================================================*
* do_get *
*===========================================================================*/
PUBLIC int do_get()
{
/* Handle GETUID, GETGID, GETPID, GETPGRP.
*/
register struct mproc *rmp = mp;
int r, proc;
switch(call_nr) {
case GETUID:
r = rmp->mp_realuid;
rmp->mp_reply.reply_res2 = rmp->mp_effuid;
break;
case GETGID:
r = rmp->mp_realgid;
rmp->mp_reply.reply_res2 = rmp->mp_effgid;
break;
case MINIX_GETPID:
r = mproc[who_p].mp_pid;
rmp->mp_reply.reply_res2 = mproc[rmp->mp_parent].mp_pid;
break;
case GETPGRP:
r = rmp->mp_procgrp;
break;
default:
r = EINVAL;
break;
}
return(r);
}
/*===========================================================================*
* do_set *
*===========================================================================*/
PUBLIC int do_set()
{
/* Handle SETUID, SETEUID, SETGID, SETEGID, SETSID. These calls have in common
* that, if successful, they will be forwarded to VFS as well.
*/
register struct mproc *rmp = mp;
message m;
int r;
switch(call_nr) {
case SETUID:
case SETEUID:
if (rmp->mp_realuid != (uid_t) m_in.usr_id &&
rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == SETUID) rmp->mp_realuid = (uid_t) m_in.usr_id;
rmp->mp_effuid = (uid_t) m_in.usr_id;
m.m_type = PM_SETUID;
m.PM_PROC = rmp->mp_endpoint;
m.PM_EID = rmp->mp_effuid;
m.PM_RID = rmp->mp_realuid;
break;
case SETGID:
case SETEGID:
if (rmp->mp_realgid != (gid_t) m_in.grp_id &&
rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == SETGID) rmp->mp_realgid = (gid_t) m_in.grp_id;
rmp->mp_effgid = (gid_t) m_in.grp_id;
m.m_type = PM_SETGID;
m.PM_PROC = rmp->mp_endpoint;
m.PM_EID = rmp->mp_effgid;
m.PM_RID = rmp->mp_realgid;
break;
case SETSID:
if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
rmp->mp_procgrp = rmp->mp_pid;
m.m_type = PM_SETSID;
m.PM_PROC = rmp->mp_endpoint;
break;
default:
return(EINVAL);
}
/* Send the request to FS */
tell_fs(rmp, &m);
/* Do not reply until FS has processed the request */
return(SUSPEND);
}