minix/servers/pm/getset.c
Lionel Sambuc ca31c1caae Message type for PM_GETSID
Change-Id: Ife3f9f6a7b6190baca6f379f7d3c36388baf6904
2014-07-28 17:05:37 +02:00

189 lines
4.2 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 <limits.h>
#include <minix/com.h>
#include <signal.h>
#include "mproc.h"
/*===========================================================================*
* do_get *
*===========================================================================*/
int do_get()
{
/* Handle PM_GETUID, PM_GETGID, PM_GETGROUPS, PM_GETPID, PM_GETPGRP, PM_GETSID,
* PM_ISSETUGID.
*/
register struct mproc *rmp = mp;
int r;
int ngroups;
switch(call_nr) {
case PM_GETGROUPS:
ngroups = m_in.m_lc_pm_groups.num;
if (ngroups > NGROUPS_MAX || ngroups < 0)
return(EINVAL);
if (ngroups == 0) {
r = rmp->mp_ngroups;
break;
}
if (ngroups < rmp->mp_ngroups)
/* Asking for less groups than available */
return(EINVAL);
r = sys_datacopy(SELF, (vir_bytes) rmp->mp_sgroups, who_e,
m_in.m_lc_pm_groups.ptr, ngroups * sizeof(gid_t));
if (r != OK)
return(r);
r = rmp->mp_ngroups;
break;
case PM_GETUID:
r = rmp->mp_realuid;
rmp->mp_reply.m_pm_lc_getuid.euid = rmp->mp_effuid;
break;
case PM_GETGID:
r = rmp->mp_realgid;
rmp->mp_reply.m_pm_lc_getgid.egid = rmp->mp_effgid;
break;
case PM_GETPID:
r = mproc[who_p].mp_pid;
rmp->mp_reply.m_pm_lc_getpid.parent_pid = mproc[rmp->mp_parent].mp_pid;
break;
case PM_GETPGRP:
r = rmp->mp_procgrp;
break;
case PM_GETSID:
{
struct mproc *target;
pid_t p = m_in.m_lc_pm_getsid.pid;
target = p ? find_proc(p) : &mproc[who_p];
r = ESRCH;
if(target)
r = target->mp_procgrp;
break;
}
case PM_ISSETUGID:
r = !!(rmp->mp_flags & TAINTED);
break;
default:
r = EINVAL;
break;
}
return(r);
}
/*===========================================================================*
* do_set *
*===========================================================================*/
int do_set()
{
/* Handle PM_SETUID, PM_SETEUID, PM_SETGID, PM_SETGROUPS, PM_SETEGID, and
* 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, i;
int ngroups;
uid_t uid;
gid_t gid;
memset(&m, 0, sizeof(m));
switch(call_nr) {
case PM_SETUID:
case PM_SETEUID:
uid = m_in.m_lc_pm_setuid.uid;
if (rmp->mp_realuid != uid && rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == PM_SETUID) rmp->mp_realuid = uid;
rmp->mp_effuid = uid;
m.m_type = VFS_PM_SETUID;
m.VFS_PM_ENDPT = rmp->mp_endpoint;
m.VFS_PM_EID = rmp->mp_effuid;
m.VFS_PM_RID = rmp->mp_realuid;
break;
case PM_SETGID:
case PM_SETEGID:
gid = m_in.m_lc_pm_setgid.gid;
if (rmp->mp_realgid != gid && rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == PM_SETGID) rmp->mp_realgid = gid;
rmp->mp_effgid = gid;
m.m_type = VFS_PM_SETGID;
m.VFS_PM_ENDPT = rmp->mp_endpoint;
m.VFS_PM_EID = rmp->mp_effgid;
m.VFS_PM_RID = rmp->mp_realgid;
break;
case PM_SETGROUPS:
if (rmp->mp_effuid != SUPER_USER)
return(EPERM);
ngroups = m_in.m_lc_pm_groups.num;
if (ngroups > NGROUPS_MAX || ngroups < 0)
return(EINVAL);
if (ngroups > 0 && m_in.m_lc_pm_groups.ptr == 0)
return(EFAULT);
r = sys_datacopy(who_e, m_in.m_lc_pm_groups.ptr, SELF,
(vir_bytes) rmp->mp_sgroups,
ngroups * sizeof(gid_t));
if (r != OK)
return(r);
for (i = 0; i < ngroups; i++) {
if (rmp->mp_sgroups[i] > GID_MAX)
return(EINVAL);
}
for (i = ngroups; i < NGROUPS_MAX; i++) {
rmp->mp_sgroups[i] = 0;
}
rmp->mp_ngroups = ngroups;
m.m_type = VFS_PM_SETGROUPS;
m.VFS_PM_ENDPT = rmp->mp_endpoint;
m.VFS_PM_GROUP_NO = rmp->mp_ngroups;
m.VFS_PM_GROUP_ADDR = (char *) rmp->mp_sgroups;
break;
case PM_SETSID:
if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
rmp->mp_procgrp = rmp->mp_pid;
m.m_type = VFS_PM_SETSID;
m.VFS_PM_ENDPT = rmp->mp_endpoint;
break;
default:
return(EINVAL);
}
/* Send the request to VFS */
tell_vfs(rmp, &m);
/* Do not reply until VFS has processed the request */
return(SUSPEND);
}