gil@limbic.UUCP (Gil Kloepfer Jr.) (11/27/88)
The following patch can be applied to the UNIX-pc version of vi (will also affect all things linked to vi) to disable the vi modeline feature. PLEASE READ THE README FILE BEFORE APPLYING THIS PATCH! ALSO READ THE DISCLAIMER CONTAINED AT THE BEGINNING OF THE SOURCE PROGRAM! Gil Kloepfer, Jr. U-Net: {decuac,boulder,talcott,sbcs}!icus!limbic!gil ICUS Software Systems Voice: (516) 968-6860 [H] (516) 746-2350 x219 [W] P.O. Box 1 Internet: gil@icus.islp.ny.us Islip Terrace, NY 11752 "Life's a ... well, you know..." #! /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." # Contents: Makefile README vifix.c # Wrapped by gil@limbic on Sun Nov 27 02:44:47 1988 PATH=/bin:/usr/bin:/usr/ucb ; export PATH if test -f Makefile -a "${1}" != "-c" ; then echo shar: Will not over-write existing file \"Makefile\" else echo shar: Extracting \"Makefile\" \(399 characters\) sed "s/^X//" >Makefile <<'END_OF_Makefile' X# X# Makefile to compile vifix.c (vi modeline elimination) X# (c)1988 ICUS Software Systems UUCP: ...icus!software X# XCFLAGS=-v -O XLDFLAGS=-s XLIBS=/lib/crt0s.o /lib/shlib.ifile X# Xvifix: vifix.o X @echo "Loading ..." X $(LD) $(LDFLAGS) -o vifix vifix.o $(LIBS) X @echo "Copying /usr/bin/vi to current directory ..." X @cp /usr/bin/vi . X @vifix X @echo "Save old version, and copy \"vi\" to /usr/bin" END_OF_Makefile if test 399 -ne `wc -c <Makefile`; then echo shar: \"Makefile\" unpacked with wrong size! fi # end of overwriting check fi if test -f README -a "${1}" != "-c" ; then echo shar: Will not over-write existing file \"README\" else echo shar: Extracting \"README\" \(1269 characters\) sed "s/^X//" >README <<'END_OF_README' Xvi/ex modeline feature disable patch ... Gil Kloepfer, ICUS Software Systems X---------------------------------------------------------------------------- X XThis program and its Makefile are used to disable the modeline feature in Xvi/ex which can inadvertantly allow malicious users to send "infected" files Xto privileged users and disrupt system activities. X XThe patch is applied by executing the makefile ($ make). The makefile will Xcompile the patch program, copy the vi editor executable file into your Xcurrent directory and apply the patch to this copy. You should then make Xa copy of the original vi editor, and copy the new one over the old one. X X # make X # cp /usr/bin/vi /usr/bin/vi.OLD X # cp ./vi /usr/bin/vi X XThanks to Lenny Tropiano for the makefile. Those who feel more comfortable Xapplying the patch without any makefiles, the procedure is as follows: X X # cc -v -o vifix vifix.c X # cd /usr/bin X # cp vi vi.OLD X # whatever-path/vifix X XThe vifix program will inform you if the version of vi you are fixing is Xsupported by the patch program. Note that this message will also appear if Xthe patch is already applied. X XAny further questions about the patch can be directed to Gil Kloepfer Xat ...icus!limbic!gil, gil@limbic.UUCP, or gil@icus.islp.ny.us END_OF_README if test 1269 -ne `wc -c <README`; then echo shar: \"README\" unpacked with wrong size! fi # end of overwriting check fi if test -f vifix.c -a "${1}" != "-c" ; then echo shar: Will not over-write existing file \"vifix.c\" else echo shar: Extracting \"vifix.c\" \(1745 characters\) sed "s/^X//" >vifix.c <<'END_OF_vifix.c' X/* X * vifix.c X * X * Program to patch UNIX-pc (3B1) "vi" editor so that the modeline X * function is disabled. X * X * By Gil Kloepfer, Jr., Lenny Tropiano ICUS Software Systems 11/26/1988 X * Permission granted to redistribute without profit in the public domain X * only. This header must remain in-tact as is. This program carries X * no warranties, express or implied, and all consequences resulting from X * the application of this patch are the sole responsibility of the user. X * X * Patch transforms the following byte pattern in vi -- this comment here X * so that this program could be adapted to a newer version of vi: X * X * From: X * 377 374 112 200 147 000 000 174 040 X * To: X * 377 374 116 161 140 000 000 174 040 X * X * This effectively skips over the modeline checking code in the editor. X */ X X#define NONCRYPT 26202L X#define CRYPT 26343L X X#include <fcntl.h> X Xmain() X{ X char buffer[3]; X int fd; X X if ((fd=open("vi",O_RDWR)) < 0) { X perror("open"); X exit(1); X } X X lseek(fd,NONCRYPT,0); /* check for ENHANCED EDITOR version */ X if (read(fd,buffer,3) != 3) { X perror("read"); X exit(1); X } X X if ((int)buffer[0] != 0112 && X (int)buffer[1] != 0200 && X (int)buffer[2] != 0147) { X lseek(fd,CRYPT,0); /* check for ENCRYPTION SET version */ X if (read(fd,buffer,3) != 3) { X perror("read"); X exit(1); X } X if ((int)buffer[0] != 0112 && X (int)buffer[1] != 0200 && X (int)buffer[2] != 0147) { X printf("Version of vi not valid for this patch.\n"); X exit(1); X } X } X X lseek(fd,-3L,1); /* back up pointer 3 bytes */ X buffer[0]=(char)0116; X buffer[1]=(char)0161; X buffer[2]=(char)0140; X write(fd,buffer,3); X X close(fd); X printf("vi modeline elimination patch successfully applied\n"); X exit(0); X} END_OF_vifix.c if test 1745 -ne `wc -c <vifix.c`; then echo shar: \"vifix.c\" unpacked with wrong size! fi # end of overwriting check fi echo shar: End of shell archive. exit 0