1 | /* |
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2 | * zzuf - general purpose fuzzer |
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3 | * Copyright (c) 2006-2010 Sam Hocevar <sam@hocevar.net> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * This program is free software. It comes without any warranty, to |
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7 | * the extent permitted by applicable law. You can redistribute it |
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8 | * and/or modify it under the terms of the Do What The Fuck You Want |
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9 | * To Public License, Version 2, as published by Sam Hocevar. See |
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10 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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11 | */ |
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12 | |
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13 | /* |
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14 | * load-signal.c: loaded signal functions |
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15 | */ |
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16 | |
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17 | #include "config.h" |
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18 | |
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19 | /* Needed for sighandler_t on glibc systems */ |
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20 | #define _GNU_SOURCE |
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21 | /* Needed for struct sigaction on HP-UX */ |
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22 | #define _INCLUDE_POSIX_SOURCE |
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23 | |
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24 | #if defined HAVE_STDINT_H |
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25 | # include <stdint.h> |
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26 | #elif defined HAVE_INTTYPES_H |
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27 | # include <inttypes.h> |
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28 | #endif |
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29 | #include <stdlib.h> |
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30 | |
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31 | #include <string.h> |
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32 | #include <signal.h> |
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33 | |
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34 | #include "libzzuf.h" |
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35 | #include "lib-load.h" |
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36 | #include "debug.h" |
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37 | #include "fuzz.h" |
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38 | |
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39 | #if defined HAVE_SIGHANDLER_T |
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40 | # define SIG_T sighandler_t |
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41 | #elif defined HAVE_SIG_T |
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42 | # define SIG_T sig_t |
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43 | #else |
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44 | typedef void (*SIG_T) (int); |
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45 | #endif |
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46 | |
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47 | /* Library functions that we divert */ |
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48 | static SIG_T (*ORIG(signal)) (int signum, SIG_T handler); |
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49 | #if defined HAVE_SIGACTION |
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50 | static int (*ORIG(sigaction)) (int signum, const struct sigaction *act, |
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51 | struct sigaction *oldact); |
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52 | #endif |
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53 | /* Local functions */ |
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54 | static int isfatal(int signum); |
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55 | |
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56 | static int isfatal(int signum) |
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57 | { |
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58 | switch(signum) |
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59 | { |
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60 | case SIGABRT: |
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61 | case SIGFPE: |
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62 | case SIGILL: |
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63 | #if defined SIGQUIT |
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64 | case SIGQUIT: |
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65 | #endif |
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66 | case SIGSEGV: |
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67 | #if defined SIGTRAP |
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68 | case SIGTRAP: |
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69 | #endif |
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70 | #if defined SIGSYS |
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71 | case SIGSYS: |
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72 | #endif |
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73 | #if defined SIGEMT |
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74 | case SIGEMT: |
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75 | #endif |
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76 | #if defined SIGBUS |
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77 | case SIGBUS: |
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78 | #endif |
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79 | #if defined SIGXCPU |
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80 | case SIGXCPU: |
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81 | #endif |
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82 | #if defined SIGXFSZ |
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83 | case SIGXFSZ: |
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84 | #endif |
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85 | return 1; |
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86 | default: |
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87 | return 0; |
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88 | } |
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89 | } |
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90 | |
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91 | SIG_T NEW(signal)(int signum, SIG_T handler) |
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92 | { |
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93 | SIG_T ret; |
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94 | |
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95 | LOADSYM(signal); |
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96 | |
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97 | if(!_zz_signal) |
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98 | return ORIG(signal)(signum, handler); |
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99 | |
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100 | ret = ORIG(signal)(signum, isfatal(signum) ? SIG_DFL : handler); |
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101 | |
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102 | debug("%s(%i, %p) = %p", __func__, signum, handler, ret); |
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103 | |
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104 | return ret; |
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105 | } |
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106 | |
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107 | #if defined HAVE_SIGACTION |
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108 | int NEW(sigaction)(int signum, const struct sigaction *act, |
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109 | struct sigaction *oldact) |
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110 | { |
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111 | int ret; |
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112 | |
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113 | LOADSYM(sigaction); |
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114 | |
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115 | if(!_zz_signal) |
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116 | return ORIG(sigaction)(signum, act, oldact); |
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117 | |
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118 | if(act && isfatal(signum)) |
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119 | { |
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120 | struct sigaction newact; |
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121 | memcpy(&newact, act, sizeof(struct sigaction)); |
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122 | newact.sa_handler = SIG_DFL; |
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123 | ret = ORIG(sigaction)(signum, &newact, oldact); |
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124 | } |
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125 | else |
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126 | ret = ORIG(sigaction)(signum, act, oldact); |
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127 | |
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128 | debug("%s(%i, %p, %p) = %i", __func__, signum, act, oldact, ret); |
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129 | |
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130 | return ret; |
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131 | } |
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132 | #endif |
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133 | |
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