168 lines
3.7 KiB
C
168 lines
3.7 KiB
C
/* This file handles the 6 system calls that get and set uids and gids.
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* It also handles getpid(), setsid(), and getpgrp(). The code for each
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* one is so tiny that it hardly seemed worthwhile to make each a separate
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* function.
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*/
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#include "pm.h"
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#include <minix/callnr.h>
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#include <minix/endpoint.h>
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#include <limits.h>
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#include <minix/com.h>
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#include <signal.h>
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#include "mproc.h"
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#include "param.h"
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/*===========================================================================*
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* do_get *
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*===========================================================================*/
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PUBLIC int do_get()
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{
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/* Handle GETUID, GETGID, GETPID, GETPGRP.
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*/
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register struct mproc *rmp = mp;
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int r;
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int ngroups;
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switch(call_nr) {
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case GETGROUPS:
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ngroups = m_in.grp_no;
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if (ngroups > NGROUPS_MAX || ngroups < 0)
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return(EINVAL);
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if (ngroups == 0) {
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r = rmp->mp_ngroups;
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break;
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}
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if (ngroups < rmp->mp_ngroups)
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/* Asking for less groups than available */
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return(EINVAL);
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r = sys_datacopy(SELF, (vir_bytes) rmp->mp_sgroups, who_e,
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(vir_bytes) m_in.groupsp, ngroups * sizeof(gid_t));
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if (r != OK)
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return(r);
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r = rmp->mp_ngroups;
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break;
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case GETUID:
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r = rmp->mp_realuid;
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rmp->mp_reply.reply_res2 = rmp->mp_effuid;
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break;
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case GETGID:
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r = rmp->mp_realgid;
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rmp->mp_reply.reply_res2 = rmp->mp_effgid;
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break;
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case MINIX_GETPID:
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r = mproc[who_p].mp_pid;
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rmp->mp_reply.reply_res2 = mproc[rmp->mp_parent].mp_pid;
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break;
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case GETPGRP:
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r = rmp->mp_procgrp;
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break;
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default:
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r = EINVAL;
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break;
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}
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return(r);
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}
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/*===========================================================================*
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* do_set *
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*===========================================================================*/
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PUBLIC int do_set()
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{
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/* Handle SETUID, SETEUID, SETGID, SETEGID, SETSID. These calls have in common
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* that, if successful, they will be forwarded to VFS as well.
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*/
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register struct mproc *rmp = mp;
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message m;
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int r, i;
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int ngroups;
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switch(call_nr) {
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case SETUID:
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case SETEUID:
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if (rmp->mp_realuid != (uid_t) m_in.usr_id &&
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rmp->mp_effuid != SUPER_USER)
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return(EPERM);
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if(call_nr == SETUID) rmp->mp_realuid = (uid_t) m_in.usr_id;
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rmp->mp_effuid = (uid_t) m_in.usr_id;
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m.m_type = PM_SETUID;
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m.PM_PROC = rmp->mp_endpoint;
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m.PM_EID = rmp->mp_effuid;
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m.PM_RID = rmp->mp_realuid;
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break;
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case SETGID:
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case SETEGID:
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if (rmp->mp_realgid != (gid_t) m_in.grp_id &&
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rmp->mp_effuid != SUPER_USER)
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return(EPERM);
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if(call_nr == SETGID) rmp->mp_realgid = (gid_t) m_in.grp_id;
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rmp->mp_effgid = (gid_t) m_in.grp_id;
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m.m_type = PM_SETGID;
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m.PM_PROC = rmp->mp_endpoint;
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m.PM_EID = rmp->mp_effgid;
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m.PM_RID = rmp->mp_realgid;
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break;
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case SETGROUPS:
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if (rmp->mp_effuid != SUPER_USER)
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return(EPERM);
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ngroups = m_in.grp_no;
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if (ngroups > NGROUPS_MAX || ngroups < 0)
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return(EINVAL);
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if (m_in.groupsp == NULL)
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return(EFAULT);
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r = sys_datacopy(who_e, (vir_bytes) m_in.groupsp, SELF,
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(vir_bytes) rmp->mp_sgroups,
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ngroups * sizeof(gid_t));
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if (r != OK)
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return(r);
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for (i = ngroups; i < NGROUPS_MAX; i++)
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rmp->mp_sgroups[i] = 0;
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rmp->mp_ngroups = ngroups;
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m.m_type = PM_SETGROUPS;
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m.PM_PROC = rmp->mp_endpoint;
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m.PM_GROUP_NO = rmp->mp_ngroups;
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m.PM_GROUP_ADDR = rmp->mp_sgroups;
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break;
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case SETSID:
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if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
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rmp->mp_procgrp = rmp->mp_pid;
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m.m_type = PM_SETSID;
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m.PM_PROC = rmp->mp_endpoint;
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break;
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default:
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return(EINVAL);
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}
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/* Send the request to VFS */
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tell_vfs(rmp, &m);
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/* Do not reply until VFS has processed the request */
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return(SUSPEND);
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}
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