79 lines
2 KiB
C
79 lines
2 KiB
C
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/* This file handles the 4 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 "mm.h"
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#include <minix/callnr.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_getset *
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*===========================================================================*/
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PUBLIC int do_getset()
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{
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/* Handle GETUID, GETGID, GETPID, GETPGRP, SETUID, SETGID, SETSID. The four
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* GETs and SETSID return their primary results in 'r'. GETUID, GETGID, and
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* GETPID also return secondary results (the effective IDs, or the parent
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* process ID) in 'reply_res2', which is returned to the user.
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*/
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register struct mproc *rmp = mp;
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register int r;
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switch(call_nr) {
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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 GETPID:
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r = mproc[who].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 SETUID:
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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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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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tell_fs(SETUID, who, rmp->mp_realuid, rmp->mp_effuid);
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r = OK;
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break;
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case SETGID:
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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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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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tell_fs(SETGID, who, rmp->mp_realgid, rmp->mp_effgid);
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r = OK;
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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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tell_fs(SETSID, who, 0, 0);
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/*FALL THROUGH*/
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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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