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srogue: prevent overflowing the score file name. If SCOREFILE is not defined, roguehome() is called to find a directory for the score file. It copies up to PATH_MAX-20 bytes from an environment variable to a static buffer. Later these are strcpy()'d to scorefile, which is of size LINLEN. Unfortunately LINLEN is 80 and PATH_MAX is at least 256. On Linux, it happens to be 4096. I haven't yet managed to crash or exploit it, but there are surely no beneficial consequences, so roguehome() has been modified to check the length, and the string it returns is also checked in main().
author John "Elwin" Edwards
date Sun, 02 Aug 2015 12:14:47 -0400
parents ea7372f5d314
children 1b73a8641b37
line wrap: on
line source

/*
 * Defines for things used in mach_dep.c
 *
 * @(#)extern.h	4.3 (Berkeley) 4/2/82
 *
 * Rogue: Exploring the Dungeons of Doom
 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
 * All rights reserved.
 *
 * See the file LICENSE.TXT for full copyright and licensing information.
 */

/*
 * Don't change the constants, since they are used for sizes in many
 * places in the program.
 */

#define MAXSTR		80	/* maximum length of strings */
#define MAXLINES	32	/* maximum number of screen lines used */
#define MAXCOLS		80	/* maximum number of screen columns used */

#define RN		(((seed = seed*11109+13849) >> 16) & 0xffff)

/*
 * Now all the global variables
 */

extern bool	after, amulet, askme, door_stop, fight_flush,
		firstmove, in_shell, jump, noscore, p_know[], passgo,
		playing, r_know[], running, s_know[], save_msg,
		slow_invent, terse, use_savedir, wizard, ws_know[];


extern const char *p_colors[], *r_stones[], *w_names[], 
                  *a_names[], *ws_made[];
extern char	_flags[], _level[], file_name[], fruit[],
		home[], huh[], outbuf[], *p_guess[],
		prbuf[], *r_guess[], *release, runch,
		*s_guess[], *s_names[], take, whoami[],
		*ws_guess[], *ws_type[];

extern int	a_chances[], a_class[], count, dnum, food_left,
		fung_hit, fd, group, hungry_state, inpack, lastscore,
		level, lfd, max_level, mpos, no_command, no_food, no_move,
		ntraps, purse, quiet, total;

extern long	seed;

extern WINDOW	*hw;

/*
 * Function types
 */

char	*charge_str(), *ctime(), *getenv(), *inv_name(),
	*killname(), *nothing(), *num(), *ring_num(),
	*tr_name(),
	*unctrol(), *vowelstr();

void    leave(int), quit(int), tstp(), auto_save(int), endit(int);
int	doctor(), nohaste(),
	rollwand(), runners(), sight(), stomach(), swander(),
	turn_see(), unconfuse(), unsee();

void	checkout();

long	lseek();

extern coord ch_ret;
extern shint countch;
extern shint direction;
extern shint newcount;
extern int   between;
extern int   num_checks;
extern char  lvl_mons[27];
extern char  wand_mons[27];
extern coord nh;
extern bool  got_genocide;

#if defined(__GLIBC__) || defined(__INTERIX)
/*
   O_BINARY flag not provided in Interix/SFU or some versions of Linux. 
   It is the same as default behavior so we just zero define it here
   to make source code compatible.
*/
#define O_BINARY 0
#endif

extern FILE *md_fdopen(int fd, char *mode);
extern char *md_getusername(int uid);
extern char *md_gethomedir();