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[unix-history] / usr / src / sys / kern / kern_prot.c
diff --git a/usr/src/sys/kern/kern_prot.c b/usr/src/sys/kern/kern_prot.c
index d8113e2..8cf9040 100644 (file)
--- a/usr/src/sys/kern/kern_prot.c
+++ b/usr/src/sys/kern/kern_prot.c
@@ -1,28 +1,30 @@
-/*     kern_prot.c     5.3     82/07/24        */
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ *     @(#)kern_prot.c 7.2 (Berkeley) %G%
+ */
 
 /*
  * System calls related to processes and protection
  */
 
 
 /*
  * System calls related to processes and protection
  */
 
-/* NEED ALLOCATION AND PROTECTION MECHANISM FOR PROCESS GROUPS */
-
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/reg.h"
-#include "../h/inode.h"
-#include "../h/proc.h"
-#include "../h/clock.h"
-#include "../h/mtpr.h"
-#include "../h/timeb.h"
-#include "../h/times.h"
-#include "../h/reboot.h"
-#include "../h/fs.h"
-#include "../h/conf.h"
-#include "../h/buf.h"
-#include "../h/mount.h"
-#include "../h/quota.h"
+#include "../machine/reg.h"
+
+#include "param.h"
+#include "systm.h"
+#include "dir.h"
+#include "user.h"
+#include "inode.h"
+#include "proc.h"
+#include "timeb.h"
+#include "times.h"
+#include "reboot.h"
+#include "fs.h"
+#include "buf.h"
+#include "mount.h"
+#include "quota.h"
 
 getpid()
 {
 
 getpid()
 {
@@ -39,13 +41,12 @@ getpgrp()
        register struct proc *p;
 
        if (uap->pid == 0)
        register struct proc *p;
 
        if (uap->pid == 0)
-               uap->pid = u.u_procp->p_pid;
-       p = pfind(uap->pid);
-       if (p == 0) {
+               p = u.u_procp;
+       else if ((p = pfind(uap->pid)) == 0) {
                u.u_error = ESRCH;
                return;
        }
                u.u_error = ESRCH;
                return;
        }
-       u.u_r.r_val1 = p->p_pgrp;
+       u.u_r.r_val1 = p->p_pgrp->pg_id;
 }
 
 getuid()
 }
 
 getuid()
@@ -62,149 +63,239 @@ getgid()
        u.u_r.r_val2 = u.u_gid;
 }
 
        u.u_r.r_val2 = u.u_gid;
 }
 
-getgrp()
+getgroups()
 {
        register struct a {
 {
        register struct a {
+               u_int   gidsetsize;
                int     *gidset;
        } *uap = (struct a *)u.u_ap;
                int     *gidset;
        } *uap = (struct a *)u.u_ap;
+       register gid_t *gp;
+       register int *lp;
+       int groups[NGROUPS];
 
 
-       if (copyout((caddr_t)u.u_grps, (caddr_t)uap->gidset,
-           sizeof (u.u_grps))) {
-               u.u_error = EFAULT;
+       for (gp = &u.u_groups[NGROUPS]; gp > u.u_groups; gp--)
+               if (gp[-1] != NOGROUP)
+                       break;
+       if (uap->gidsetsize < gp - u.u_groups) {
+               u.u_error = EINVAL;
                return;
        }
                return;
        }
+       uap->gidsetsize = gp - u.u_groups;
+       for (lp = groups, gp = u.u_groups; lp < &groups[uap->gidsetsize]; )
+               *lp++ = *gp++;
+       u.u_error = copyout((caddr_t)groups, (caddr_t)uap->gidset,
+           uap->gidsetsize * sizeof (groups[0]));
+       if (u.u_error)
+               return;
+       u.u_r.r_val1 = uap->gidsetsize;
 }
 
 }
 
+setsid()
+{
+       register struct proc *p = u.u_procp;
+
+       if ((p->p_pgid == p->p_pid) || pgfind(p->p_pid))
+               u.u_error = EPERM;
+       else {
+               pgmv(p, p->p_pid, 1);
+               u.u_r.r_val1 = p->p_pid;
+       }
+       return;
+}
+
+/*
+ * set process group
+ *
+ * if target pid != caller's pid
+ *     pid must be an inferior
+ *     pid must be in same session
+ *     pid can't have done an exec
+ *     there must exist a pid with pgid in same session 
+ * pid must not be session leader
+ */
 setpgrp()
 {
 setpgrp()
 {
-       register struct proc *p;
        register struct a {
                int     pid;
        register struct a {
                int     pid;
-               int     pgrp;
+               int     pgid;
        } *uap = (struct a *)u.u_ap;
        } *uap = (struct a *)u.u_ap;
+       register struct proc *p;
+       register struct pgrp *pgrp;
 
        if (uap->pid == 0)
 
        if (uap->pid == 0)
-               uap->pid = u.u_procp->p_pid;
-       p = pfind(uap->pid);
-       if (p == 0) {
+               p = u.u_procp;
+       else if ((p = pfind(uap->pid)) == 0 || !inferior(p)) {
                u.u_error = ESRCH;
                return;
        }
                u.u_error = ESRCH;
                return;
        }
-       if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) {
+       else if (p != u.u_procp) { 
+               if (p->p_session != u.u_procp->p_session) {
+                       u.u_error = EPERM;
+                       return;
+               }
+               if (p->p_flag&SEXEC) {
+                       u.u_error = EACCES;
+                       return;
+               }
+       }
+       if (SESS_LEADER(p)) {
+               u.u_error = EPERM;
+               return;
+       }
+       if (uap->pgid == 0)
+               uap->pgid = p->p_pid;
+       else if ((uap->pgid != p->p_pid) &&
+               (((pgrp = pgfind(uap->pgid)) == 0) || 
+                  pgrp->pg_mem == NULL ||
+                  pgrp->pg_session != u.u_procp->p_session)) {
                u.u_error = EPERM;
                return;
        }
                u.u_error = EPERM;
                return;
        }
-       p->p_pgrp = uap->pgrp;
+       /*
+        * done checking, now doit
+        */
+       pgmv(p, uap->pgid, 0);
 }
 
 }
 
-setuid()
+setreuid()
 {
 {
-       register uid;
-       register struct a {
-               int     uid;
+       struct a {
+               int     ruid;
+               int     euid;
        } *uap;
        } *uap;
+       register int ruid, euid;
 
        uap = (struct a *)u.u_ap;
 
        uap = (struct a *)u.u_ap;
-       uid = uap->uid;
-       if (u.u_ruid == uid || u.u_uid == uid || suser()) {
+       ruid = uap->ruid;
+       if (ruid == -1)
+               ruid = u.u_ruid;
+       if (u.u_ruid != ruid && u.u_uid != ruid && !suser())
+               return;
+       euid = uap->euid;
+       if (euid == -1)
+               euid = u.u_uid;
+       if (u.u_ruid != euid && u.u_uid != euid && !suser())
+               return;
+       /*
+        * Everything's okay, do it.
+        */
 #ifdef QUOTA
 #ifdef QUOTA
-               if (u.u_quota->q_uid != uid) {
-                       qclean();
-                       qstart(getquota(uid, 0, 0));
-               }
-#endif
-               u.u_uid = uid;
-               u.u_procp->p_uid = uid;
-               u.u_ruid = uid;
+       if (u.u_quota->q_uid != ruid) {
+               qclean();
+               qstart(getquota((uid_t)ruid, 0, 0));
        }
        }
+#endif
+       u.u_procp->p_uid = euid;
+       u.u_ruid = ruid;
+       u.u_uid = euid;
 }
 
 }
 
-setgid()
+setregid()
 {
 {
-       register gid;
        register struct a {
        register struct a {
-               int     gid;
+               int     rgid;
+               int     egid;
        } *uap;
        } *uap;
+       register int rgid, egid;
 
        uap = (struct a *)u.u_ap;
 
        uap = (struct a *)u.u_ap;
-       gid = uap->gid;
-       if (u.u_rgid == gid || u.u_gid == gid || suser()) {
-               u.u_gid = gid;
-               u.u_rgid = gid;
+       rgid = uap->rgid;
+       if (rgid == -1)
+               rgid = u.u_rgid;
+       if (u.u_rgid != rgid && u.u_gid != rgid && !suser())
+               return;
+       egid = uap->egid;
+       if (egid == -1)
+               egid = u.u_gid;
+       if (u.u_rgid != egid && u.u_gid != egid && !suser())
+               return;
+       if (u.u_rgid != rgid) {
+               leavegroup(u.u_rgid);
+               (void) entergroup((gid_t)rgid);
+               u.u_rgid = rgid;
        }
        }
+       u.u_gid = egid;
 }
 
 }
 
-setgrp()
+setgroups()
 {
        register struct a {
 {
        register struct a {
+               u_int   gidsetsize;
                int     *gidset;
        } *uap = (struct a *)u.u_ap;
                int     *gidset;
        } *uap = (struct a *)u.u_ap;
+       register gid_t *gp;
+       register int *lp;
+       int groups[NGROUPS];
 
 
-       if (suser())
+       if (!suser())
                return;
                return;
-       if (copyin((caddr_t)uap->gidset, (caddr_t)u.u_grps,
-           sizeof (u.u_grps))) {
-               u.u_error = EFAULT;
+       if (uap->gidsetsize > sizeof (u.u_groups) / sizeof (u.u_groups[0])) {
+               u.u_error = EINVAL;
                return;
        }
                return;
        }
+       u.u_error = copyin((caddr_t)uap->gidset, (caddr_t)groups,
+           uap->gidsetsize * sizeof (groups[0]));
+       if (u.u_error)
+               return;
+       for (lp = groups, gp = u.u_groups; lp < &groups[uap->gidsetsize]; )
+               *gp++ = *lp++;
+       for ( ; gp < &u.u_groups[NGROUPS]; gp++)
+               *gp = NOGROUP;
 }
 
 }
 
-/* BEGIN DEFUNCT */
-osetgrp()
+/*
+ * Group utility functions.
+ */
+
+/*
+ * Delete gid from the group set.
+ */
+leavegroup(gid)
+       gid_t gid;
 {
 {
-       register struct a {
-               int *ngrps;
-               int *ogrps;
-       } *uap = (struct a *)u.u_ap;
-       int thegroups[NGRPS/(sizeof(int)*8)];
+       register gid_t *gp;
 
 
-       if (uap->ogrps && copyout((caddr_t)u.u_grps, (caddr_t)uap->ogrps,
-           sizeof (thegroups))) {
-               u.u_error = EFAULT;
-               return;
-       }
-       if (uap->ngrps == 0)
-               return;
-       if (copyin((caddr_t)uap->ngrps, (caddr_t)thegroups,
-           sizeof (thegroups))) {
-               u.u_error = EFAULT;
-               return;
-       }
-       if (suser())
-               bcopy((caddr_t)thegroups, (caddr_t)u.u_grps, sizeof (u.u_grps));
+       for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++)
+               if (*gp == gid)
+                       goto found;
+       return;
+found:
+       for (; gp < &u.u_groups[NGROUPS-1]; gp++)
+               *gp = *(gp+1);
+       *gp = NOGROUP;
 }
 
 /*
 }
 
 /*
- * Pid of zero implies current process.
- * Pgrp -1 is getpgrp system call returning
- * current process group.
+ * Add gid to the group set.
  */
  */
-osetpgrp()
+entergroup(gid)
+       gid_t gid;
 {
 {
-       register struct proc *p;
-       register struct a {
-               int     pid;
-               int     pgrp;
-       } *uap;
+       register gid_t *gp;
 
 
-       uap = (struct a *)u.u_ap;
-       if (uap->pid == 0)
-               p = u.u_procp;
-       else {
-               p = pfind(uap->pid);
-               if (p == 0) {
-                       u.u_error = ESRCH;
-                       return;
+       for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) {
+               if (*gp == gid)
+                       return (0);
+               if (*gp == NOGROUP) {
+                       *gp = gid;
+                       return (0);
                }
        }
                }
        }
-       if (uap->pgrp <= 0) {
-               u.u_r.r_val1 = p->p_pgrp;
-               return;
-       }
-       if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) {
-               u.u_error = EPERM;
-               return;
-       }
-       p->p_pgrp = uap->pgrp;
+       return (-1);
+}
+
+/*
+ * Check if gid is a member of the group set.
+ */
+groupmember(gid)
+       gid_t gid;
+{
+       register gid_t *gp;
+
+       if (u.u_gid == gid)
+               return (1);
+       for (gp = u.u_groups; gp < &u.u_groups[NGROUPS] && *gp != NOGROUP; gp++)
+               if (*gp == gid)
+                       return (1);
+       return (0);
 }
 }
-/* END DEFUNCT */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.