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annotate arogue7/save.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 82b2a046d151
children aa8e1fc62926
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1 /*
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2 * save.c - save and restore routines
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3 *
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4 * Advanced Rogue
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5 * Copyright (C) 1984, 1985, 1986 Michael Morgan, Ken Dalka and AT&T
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6 * All rights reserved.
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7 *
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8 * Based on "Rogue: Exploring the Dungeons of Doom"
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9 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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10 * All rights reserved.
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11 *
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12 * See the file LICENSE.TXT for full copyright and licensing information.
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13 */
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14
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15 /*
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16 * save and restore routines
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17 *
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18 */
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19
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20 #include "curses.h"
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21 #include <ctype.h>
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22 #include <stdlib.h>
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23 #include <string.h>
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24 #include <sys/types.h>
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25 #include <sys/stat.h>
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26 #include <signal.h>
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27 #include "rogue.h"
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28 #include <fcntl.h>
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29 #include <errno.h>
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30 #include "mach_dep.h"
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31 #ifdef PC7300
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32 #include "sys/window.h"
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33 extern struct uwdata wdata;
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34 #endif
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35
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36 #if u370 || uts
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37 #define ENCREAD(b,n,fd) read(fd,b,n)
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38 #define ENCWRITE(b,n,fd) write(fd,b,n)
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39 #endif
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40 #ifndef ENCREAD
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41 #define ENCREAD encread
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42 #define ENCWRITE encwrite
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43 #endif
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44
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45 typedef struct stat STAT;
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46
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47 extern char version[], encstr[];
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48 /* extern bool _endwin; */
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49 extern int errno;
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50
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51 STAT sbuf;
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52
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53 bool
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54 save_game()
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55 {
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56 register int savefd;
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57 register int c;
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58 char buf[LINELEN];
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59
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60 /*
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61 * get file name
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62 */
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63 mpos = 0;
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64 if (file_name[0] != '\0')
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65 {
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66 if (use_savedir)
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67 msg("Save game? ");
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68 else
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69 msg("Save file (%s)? ", file_name);
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70 do
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71 {
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72 c = readchar();
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73 if (c == ESCAPE) return(0);
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74 } while (c != 'n' && c != 'N' && c != 'y' && c != 'Y');
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75 mpos = 0;
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76 if (c == 'y' || c == 'Y')
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77 {
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78 msg("File name: %s", file_name);
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79 goto gotfile;
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80 }
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81 }
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82
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83 if (use_savedir)
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84 {
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85 msg("");
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86 return FALSE;
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87 }
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88
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89 do
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90 {
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91 msg("File name: ");
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