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annotate rogue5/scedit.c @ 176:db1c9a21a7c3

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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 f502bf60e6e4
children 3d4252fa2ed3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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33
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1 /*
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2 * score editor
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3 *
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4 * @(#)score.c 4.6 (Berkeley) 02/05/99
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980-1983, 1985, 1999 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 # include <curses.h>
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14 # include <stdio.h>
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15 # include <signal.h>
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16 # include <ctype.h>
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17
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18 #ifndef TRUE
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19 # define TRUE 1
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20 #endif
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21 # define FALSE 0
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22 # define RN (((seed = seed*11109+13849) >> 16) & 0xffff)
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23
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24 # define MAXSTR 80
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25
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26 # include "score.h"
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27
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28 SCORE top_ten[10];
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29
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30 char buf[BUFSIZ],
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31 *reason[] = {
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32 "killed",
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33 "quit",
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34 "A total winner",
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35 "killed with amulet",
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36 };
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37
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38 int seed;
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39 FILE *inf;
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40
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41 struct passwd *getpwnam();
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42 int do_comm();
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43 int pr_score(SCORE *, int);
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44
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45 int
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46 main(int ac, char *av[])
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47 {
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48 char *scorefile;
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49 FILE *outf;
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50
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51 if (ac == 1)
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52 scorefile = "rogue54.scr";
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53 else
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54 scorefile = av[1];
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55 seed = md_getpid();
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56
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57 if ((inf = fopen(scorefile, "r+")) < 0) {
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58 perror(scorefile);
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59 exit(1);
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60 }
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61 s_encread((char *) top_ten, sizeof top_ten, inf);
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62
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63 while (do_comm())
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64 continue;
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65
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66 exit(0);
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67 }
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68
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69 /*
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70 * do_comm:
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71 * Get and execute a command
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72 */
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73 int
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74 do_comm(void)
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75 {
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76 char *sp;
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77 SCORE *scp;
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78 struct passwd *pp;
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79 static FILE *outf = NULL;
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80 static int written = TRUE;
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81
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82 printf("\nCommand: ");
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83 while (isspace(buf[0] = getchar()) || buf[0] == '\n')
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84 continue;
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85 (void) fget(s&buf[1], BUFSIZ, stdin);
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86 buf[strlen(buf) - 1] = '\0';
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87 switch (buf[0]) {
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88 case 'w':
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89 if (strncmp(buf, "write", strlen(buf)))
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90 goto def;
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91 lseek(inf, 0L, 0);
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92 if (outf == NULL && (outf = fdopen(inf, "w")) == NULL) {
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93 perror("fdopen");
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94 exit(1);
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95 }
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96 fseek(outf, 0L, 0);
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97 if (s_lock_sc())
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98 {
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99 void (*fp)(int);
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100
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101 fp = signal(SIGINT, SIG_IGN);
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102 s_encwrite((char *) top_ten, sizeof top_ten, outf);
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103 s_unlock_sc();
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104 signal(SIGINT, fp);
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105 written = TRUE;
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106 }
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107 break;
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