Fri Dec 22 00:57:38 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>cvs/libc-951222

	* sysdeps/mach/hurd/setuid.c: Rewrote ID frobnication to do the
	right thing.
	* sysdeps/mach/hurd/setgid.c: Likewise.
	* sysdeps/mach/hurd/setreuid.c: Likewise.
	* sysdeps/mach/hurd/setregid.c: Likewise.
	* sysdeps/mach/hurd/setegid.c: Likewise.
	* sysdeps/mach/hurd/seteuid.c: Likewise.

	* sysdeps/mach/hurd/fork.c: Peek __mach_task_self_ value before
	proc_dostop call to work around kernel paging bug.

Thu Dec 21 12:19:32 1995  Miles Bader  <miles@gnu.ai.mit.edu>

	* sysdeps/mach/hurd/setuid.c (__setuid): Actually add the new uid
 	instead of putting it (and other uids) in the gids and leaving the
 	old uids as is.

6 files changed, 158 insertions, 58 deletions

diff --git a/sysdeps/mach/hurd/setegid.c b/sysdeps/mach/hurd/setegid.c
index 8ca4abee06..6710462125 100644
--- a/sysdeps/mach/hurd/setegid.c
+++ b/sysdeps/mach/hurd/setegid.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
 This file is part of the GNU C Library.
 
 The GNU C Library is free software; you can redistribute it and/or
@@ -40,17 +40,18 @@ DEFUN(setegid, (gid), gid_t gid)
       /* Make a new auth handle which has EGID as the first element in the
          list of effective gids.  */
 
-      size_t ngen = _hurd_id.gen.ngids < 1 ? 1 : _hurd_id.gen.ngids;
-      gid_t newgen[ngen];
-
-      newgen[0] = gid;
-      memcpy (&newgen[1], _hurd_id.gen.gids, (ngen - 1) * sizeof (gid_t));
+      if (_hurd_id.gen.ngids > 0)
+	{
+	  _hurd_id.gen.gids[0] = gid;
+	  _hurd_id.valid = 0;
+	}
 
       err = __USEPORT (AUTH, __auth_makeauth
 		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
 			_hurd_id.gen.uids, _hurd_id.gen.nuids,
 			_hurd_id.aux.uids, _hurd_id.aux.nuids,
-			newgen, ngen,
+			_hurd_id.gen.ngids ? _hurd_id.gen.gids : &gid,
+			_hurd_id.gen.ngids ?: 1,
 			_hurd_id.aux.gids, _hurd_id.aux.ngids,
 			&newauth));
     }
diff --git a/sysdeps/mach/hurd/seteuid.c b/sysdeps/mach/hurd/seteuid.c
index 9c44c4d275..62f4488624 100644
--- a/sysdeps/mach/hurd/seteuid.c
+++ b/sysdeps/mach/hurd/seteuid.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
 This file is part of the GNU C Library.
 
 The GNU C Library is free software; you can redistribute it and/or
@@ -40,15 +40,16 @@ DEFUN(seteuid, (uid), uid_t uid)
       /* Make a new auth handle which has EUID as the first element in the
          list of effective uids.  */
 
-      size_t ngen = _hurd_id.gen.nuids < 1 ? 1 : _hurd_id.gen.nuids;
-      uid_t newgen[ngen];
-
-      newgen[0] = uid;
-      memcpy (&newgen[1], _hurd_id.gen.uids, (ngen - 1) * sizeof (uid_t));
+      if (_hurd_id.gen.nuids > 0)
+	{
+	  _hurd_id.gen.uids[0] = uid;
+	  _hurd_id.valid = 0;
+	}
 
       err = __USEPORT (AUTH, __auth_makeauth
 		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
-			newgen, ngen,
+			_hurd_id.gen.nuids ? _hurd_id.gen.uids : &uid,
+			_hurd_id.gen.nuids ?: 1,
 			_hurd_id.aux.uids, _hurd_id.aux.nuids,
 			_hurd_id.gen.gids, _hurd_id.gen.ngids,
 			_hurd_id.aux.gids, _hurd_id.aux.ngids,
diff --git a/sysdeps/mach/hurd/setgid.c b/sysdeps/mach/hurd/setgid.c
index 933792b86b..660a3fe5d0 100644
--- a/sysdeps/mach/hurd/setgid.c
+++ b/sysdeps/mach/hurd/setgid.c
@@ -43,22 +43,45 @@ DEFUN(__setgid, (gid), gid_t gid)
       /* Make a new auth handle which has GID as the real gid,
 	 and as the first element in the list of effective gids.  */
 
-      gid_t newgen[_hurd_id.gen.ngids + 1];
-      gid_t newaux[_hurd_id.aux.ngids];
-      
-      newgen[0] = gid;
-      memcpy (&newgen[1], _hurd_id.gen.gids,
-	      _hurd_id.gen.ngids * sizeof (gid_t));
-      newaux[0] = gid;
-      memcpy (&newaux[1], _hurd_id.aux.gids,
-	      (_hurd_id.aux.ngids - 1) * sizeof (gid_t));
+      gid_t *newgen, *newaux, auxbuf[2];
+      size_t ngen, naux;
+
+      newaux = _hurd_id.aux.gids;
+      naux = _hurd_id.aux.ngids;
+      if (_hurd_id.gen.ngids == 0)
+	{
+	  /* No effective gids now.  The new set will be just GID.  */
+	  newgen = &gid;
+	  ngen = 1;
+	}
+      else if (_hurd_id.gen.gids[0] == 0)
+	{
+	  /* We are root; set the effective, real, and saved to GID.  */
+	  _hurd_id.gen.gids[0] = gid;
+	  _hurd_id.valid = 0;
+	  newgen = _hurd_id.gen.gids;
+	  ngen = _hurd_id.gen.ngids;
+	  if (_hurd_id.aux.ngids < 2)
+	    {
+	      newaux = auxbuf;
+	      naux = 2;
+	    }
+	  _hurd_id.aux.gids[0] = _hurd_id.aux.gids[1] = gid;
+	}
+      else
+	{
+	  /* We are not root; just change the effective GID.  */
+	  _hurd_id.gen.gids[0] = gid;
+	  _hurd_id.valid = 0;
+	  newgen = _hurd_id.gen.gids;
+	  ngen = _hurd_id.gen.ngids;
+	}
 
       err = __USEPORT (AUTH, __auth_makeauth
 		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
-			_hurd_id.gen.uids, _hurd_id.gen.nuids,
-			_hurd_id.aux.uids, _hurd_id.aux.nuids,
-			newgen, 1 + _hurd_id.gen.ngids,
-			newaux, _hurd_id.aux.ngids,
+			newgen, ngen, newaux, naux,
+			_hurd_id.gen.gids, _hurd_id.gen.ngids,
+			_hurd_id.aux.gids, _hurd_id.aux.ngids,
 			&newauth));
     }
   __mutex_unlock (&_hurd_id.lock);
diff --git a/sysdeps/mach/hurd/setregid.c b/sysdeps/mach/hurd/setregid.c
index 8b76f7008a..ea7e38bc74 100644
--- a/sysdeps/mach/hurd/setregid.c
+++ b/sysdeps/mach/hurd/setregid.c
@@ -39,21 +39,47 @@ __setregid (gid_t rgid, gid_t egid)
       /* Make a new auth handle which has RGID as the real gid,
 	 and EGID as the first element in the list of effective gids.  */
 
-      size_t ngen = _hurd_id.gen.ngids < 1 ? 1 : _hurd_id.gen.ngids;
-      size_t naux = _hurd_id.aux.ngids < 1 ? 1 : _hurd_id.aux.ngids;
-      gid_t newaux[naux], newgen[ngen];
+      gid_t *newgen, *newaux;
+      size_t ngen, naux;
 
-      newgen[0] = egid;
-      memcpy (&newgen[1], _hurd_id.gen.gids, (ngen - 1) * sizeof (gid_t));
-      newaux[0] = rgid;
-      memcpy (&newaux[1], _hurd_id.aux.gids, (naux - 1) * sizeof (gid_t));
+      newgen = _hurd_id.gen.gids;
+      ngen = _hurd_id.gen.ngids;
+      if (egid != -1)
+	{
+	  if (_hurd_id.gen.ngids == 0)
+	    {
+	      /* No effective gids now.  The new set will be just GID.  */
+	      newgen = &egid;
+	      ngen = 1;
+	    }
+	  else
+	    {
+	      _hurd_id.gen.gids[0] = egid;
+	      _hurd_id.valid = 0;
+	    }
+	}
+
+      newaux = _hurd_id.aux.gids;
+      naux = _hurd_id.aux.ngids;
+      if (rgid != -1)
+	{
+	  if (_hurd_id.aux.ngids == 0)
+	    {
+	      newaux = &rgid;
+	      naux = 1;
+	    }
+	  else
+	    {
+	      _hurd_id.aux.gids[0] = rgid;
+	      _hurd_id.valid = 0;
+	    }
+	}
 
       err = __USEPORT (AUTH, __auth_makeauth
 		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
-			_hurd_id.gen.gids, _hurd_id.gen.ngids,
-			_hurd_id.aux.gids, _hurd_id.aux.ngids,
-			newgen, ngen,
-			newaux, naux,
+			_hurd_id.gen.uids, _hurd_id.gen.nuids,
+			_hurd_id.aux.uids, _hurd_id.aux.nuids,
+			newgen, ngen, newaux, naux,
 			&newauth));
     }
   __mutex_unlock (&_hurd_id.lock);
diff --git a/sysdeps/mach/hurd/setreuid.c b/sysdeps/mach/hurd/setreuid.c
index 1dcbf0ee82..530e4a20c7 100644
--- a/sysdeps/mach/hurd/setreuid.c
+++ b/sysdeps/mach/hurd/setreuid.c
@@ -39,19 +39,45 @@ __setreuid (uid_t ruid, uid_t euid)
       /* Make a new auth handle which has RUID as the real uid,
 	 and EUID as the first element in the list of effective uids.  */
 
-      size_t ngen = _hurd_id.gen.nuids < 1 ? 1 : _hurd_id.gen.nuids;
-      size_t naux = _hurd_id.aux.nuids < 1 ? 1 : _hurd_id.aux.nuids;
-      uid_t newaux[naux], newgen[ngen];
+      uid_t *newgen, *newaux;
+      size_t ngen, naux;
 
-      newgen[0] = euid;
-      memcpy (&newgen[1], _hurd_id.gen.uids, (ngen - 1) * sizeof (uid_t));
-      newaux[0] = ruid;
-      memcpy (&newaux[1], _hurd_id.aux.uids, (naux - 1) * sizeof (uid_t));
+      newgen = _hurd_id.gen.uids;
+      ngen = _hurd_id.gen.nuids;
+      if (euid != -1)
+	{
+	  if (_hurd_id.gen.nuids == 0)
+	    {
+	      /* No effective uids now.  The new set will be just UID.  */
+	      newgen = &euid;
+	      ngen = 1;
+	    }
+	  else
+	    {
+	      _hurd_id.gen.uids[0] = euid;
+	      _hurd_id.valid = 0;
+	    }
+	}
+
+      newaux = _hurd_id.aux.uids;
+      naux = _hurd_id.aux.nuids;
+      if (ruid != -1)
+	{
+	  if (_hurd_id.aux.nuids == 0)
+	    {
+	      newaux = &ruid;
+	      naux = 1;
+	    }
+	  else
+	    {
+	      _hurd_id.aux.uids[0] = ruid;
+	      _hurd_id.valid = 0;
+	    }
+	}
 
       err = __USEPORT (AUTH, __auth_makeauth
 		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
-			newgen, ngen,
-			newaux, naux,
+			newgen, ngen, newaux, naux,
 			_hurd_id.gen.gids, _hurd_id.gen.ngids,
 			_hurd_id.aux.gids, _hurd_id.aux.ngids,
 			&newauth));
diff --git a/sysdeps/mach/hurd/setuid.c b/sysdeps/mach/hurd/setuid.c
index 70d5ba4456..586ad2154f 100644
--- a/sysdeps/mach/hurd/setuid.c
+++ b/sysdeps/mach/hurd/setuid.c
@@ -43,20 +43,43 @@ DEFUN(__setuid, (uid), uid_t uid)
       /* Make a new auth handle which has UID as the real uid,
 	 and as the first element in the list of effective uids.  */
 
-      uid_t newgen[_hurd_id.gen.nuids + 1];
-      uid_t newaux[_hurd_id.aux.nuids];
-      
-      newgen[0] = uid;
-      memcpy (&newgen[1], _hurd_id.gen.uids,
-	      _hurd_id.gen.nuids * sizeof (uid_t));
-      newaux[0] = uid;
-      memcpy (&newaux[1], _hurd_id.aux.uids + 1,
-	      (_hurd_id.aux.nuids - 1) * sizeof (uid_t));
+      uid_t *newgen, *newaux, auxbuf[2];
+      size_t ngen, naux;
+
+      newaux = _hurd_id.aux.uids;
+      naux = _hurd_id.aux.nuids;
+      if (_hurd_id.gen.nuids == 0)
+	{
+	  /* No effective uids now.  The new set will be just UID.  */
+	  newgen = &uid;
+	  ngen = 1;
+	}
+      else if (_hurd_id.gen.uids[0] == 0)
+	{
+	  /* We are root; set the effective, real, and saved to UID.  */
+	  _hurd_id.gen.uids[0] = uid;
+	  _hurd_id.valid = 0;
+	  newgen = _hurd_id.gen.uids;
+	  ngen = _hurd_id.gen.nuids;
+	  if (_hurd_id.aux.nuids < 2)
+	    {
+	      newaux = auxbuf;
+	      naux = 2;
+	    }
+	  _hurd_id.aux.uids[0] = _hurd_id.aux.uids[1] = uid;
+	}
+      else
+	{
+	  /* We are not root; just change the effective UID.  */
+	  _hurd_id.gen.uids[0] = uid;
+	  _hurd_id.valid = 0;
+	  newgen = _hurd_id.gen.uids;
+	  ngen = _hurd_id.gen.nuids;
+	}
 
       err = __USEPORT (AUTH, __auth_makeauth
 		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
-			newgen, 1 + _hurd_id.gen.nuids,
-			newaux, _hurd_id.aux.nuids,
+			newgen, ngen, newaux, naux,
 			_hurd_id.gen.gids, _hurd_id.gen.ngids,
 			_hurd_id.aux.gids, _hurd_id.aux.ngids,
 			&newauth));