Newsgroups: comp.sys.hp
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!ghost.unimi.it!marco
From: marco@ghost.unimi.it (Marco Negri)
Subject: NFS root uid == -2 : Solution
Message-ID: <1991May13.203301.13754@ghost.unimi.it>
Organization: Computer Science Dep. - Milan University
Date: Mon, 13 May 1991 20:33:01 GMT
Lines: 164

	I have posted, yesterday, an help request about root uid == -2
	on remote access to an NFS.
	I have recived many respond, thanks very much to everybody, and
	I have tested it on hp-ux 7.0 on an hp9000s800 (825/835/855).
	The solution is to patch the value of "nobody" Kernel variable.
	nobody represent the uid of root when made a remote access.
	Sources are enclosed, simple and run fine.
	Marco.

--
Marco Negri					Phone  : +39-2-7575242
Computer Science Dep. Milan University 		Fax    : +39-2-76110556
Via Moretto da Brescia, 9			Telex  : 335199 - MIDSII
I-20133 Milano - Italy - `92 Europe		E-Mail : marco@ghost.unimi.it


#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#		"End of shell archive."
# Wrapped by marco@ghost on Mon May 13 20:35:13 1991
# Contents:  Makefile nfspatch.c
# Existing files will not be overwritten.
# Error checking via wc(1) will be performed.

overwrite_check()
{
	echo Ok to overwrite existing file $1 \? \\c
	read answer
	case "$answer" in
	[yY]*)	echo Proceeding;;
	*)	echo Aborting; exit 1;;
	esac
	rm -f $1
	if test -f $1
	then
		echo Error: could not remove $1, aborting
		exit 1
	fi
}

test "${1}" != "-c"
overwrite_opt=$?
LANG=""; export LANG
PATH=/bin:/usr/bin:$PATH; export PATH

if test -f Makefile -a $overwrite_opt -eq 0
then
	overwrite_check Makefile
fi
[ -d `dirname Makefile` ] || mkdir -p `dirname Makefile`
echo x - Makefile
sed "s/^X//" > Makefile <<'@EOF'
X#
X# $Author: marco $
X# $Id: Makefile,v 1.1 1991/05/13 18:33:26 marco Exp marco $
X# $Date: 1991/05/13 18:33:26 $
X# $Revision: 1.1 $
X# $Lock:$
X#
X
XCFLAGS	= -O -s -n
XINST	= /usr/local/bin
X
Xnfspatch : nfspatch.c
X	cc $(CFLAGS) $@.c -o $@
X	cpset $@ $(INST)
@EOF
set `wc -lwc <Makefile`
if test $1$2$3 != 1446250
then
	echo ERROR: wc results of Makefile are $* should be 14 46 250
fi

chmod 600 Makefile

if test -f nfspatch.c -a $overwrite_opt -eq 0
then
	overwrite_check nfspatch.c
fi
[ -d `dirname nfspatch.c` ] || mkdir -p `dirname nfspatch.c`
echo x - nfspatch.c
sed "s/^X//" > nfspatch.c <<'@EOF'
X/*
X * $Author: marco $
X * $Id: nfspatch.c,v 1.1 1991/05/13 18:33:26 marco Exp marco $
X * $Date: 1991/05/13 18:33:26 $
X * $Revision: 1.1 $
X * $Lock:$
X */
X
X#ifndef	lint
Xstatic char *rcsid = "@(#) $Id: nfspatch.c,v 1.1 1991/05/13 18:33:26 marco Exp marco $";
X#endif	lint
X
X#include <fcntl.h>
X#include <stdio.h>
X#include <nlist.h>
X
Xstruct nlist	nl_tbl[]	= {
X#ifdef	hp9000s800
X	{"nobody", 0},
X#else	hp9000s800
X	{"_nobody", 0},
X#endif	hp9000s800
X	{0}
X};
X
X#define	ADDR	nl_tbl[0].n_value
X
X#define	KERNEL	"/hp-ux"
X
Xmain(argc, argv)
Xint	argc;
Xchar	*argv[];
X{
X	register int	i	= 0;
X	int		fd;
X	int		v	= 0;
X
X	if (argc > 2) {
X		fprintf(stderr, "Usage	: %s [remote-root-uid]\n", argv[0]);
X		exit(1);
X	}
X
X	if (argc == 2)
X		v	= atoi(argv[1]);
X
X	if (nlist(KERNEL, nl_tbl) == -1) {
X		perror("nlist()");
X		exit(1);
X	}
X
X	if ((fd = open("/dev/kmem", O_RDWR)) == -1) {
X		perror("/dev/kmem");
X		exit(1);
X	}
X
X	if (lseek(fd, ADDR, 0) != ADDR) {
X		perror("lseek()");
X		exit(1);
X	}
X
X	if (write(fd, &v, sizeof(v)) != sizeof(v)) {
X		perror("write()");
X		exit(1);
X	}
X
X	exit(0);
X}
@EOF
set `wc -lwc <nfspatch.c`
if test $1$2$3 != 671541047
then
	echo ERROR: wc results of nfspatch.c are $* should be 67 154 1047
fi

chmod 600 nfspatch.c

echo shar: End of shell archive.
exit 0
-- 
Marco Negri					Phone  : +39-2-7575242
Computer Science Dep. Milan University 		Fax    : +39-2-76110556
Via Moretto da Brescia, 9			Telex  : 335199 - MIDSII
I-20133 Milano - Italy - `92 Europe		E-Mail : marco@ghost.unimi.it