Mercurial > sdl-ios-xcode
annotate src/SDL_fatal.c @ 4355:9b464226e541 SDL-1.2
Fixed bug #855
Ludwig Nussel 2009-10-18 06:31:52 PDT
an mprotect call was added to fix bug 528. However that results in a buffer
that allows writing and code execution. Ie the no-execute security features of
modern operating systems are defeated this way. Two mprotect calls are needed.
One to make the buffer executable but not writeable when done and another one
to make the buffer writeable again if the content needs to be changed.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Oct 2009 17:31:37 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* General fatal signal handling code for SDL */ | |
| 25 | |
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26 #ifdef HAVE_SIGNAL_H |
| 0 | 27 |
| 28 #include <signal.h> | |
| 29 | |
| 30 #include "SDL.h" | |
| 31 #include "SDL_fatal.h" | |
| 32 | |
| 33 /* This installs some signal handlers for the more common fatal signals, | |
| 34 so that if the programmer is lazy, the app doesn't die so horribly if | |
| 35 the program crashes. | |
| 36 */ | |
| 37 | |
| 38 static void SDL_Parachute(int sig) | |
| 39 { | |
| 40 signal(sig, SIG_DFL); | |
| 41 SDL_Quit(); | |
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parents:
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42 raise(sig); |
| 0 | 43 } |
| 44 | |
| 45 static int SDL_fatal_signals[] = { | |
| 46 SIGSEGV, | |
| 47 #ifdef SIGBUS | |
| 48 SIGBUS, | |
| 49 #endif | |
| 50 #ifdef SIGFPE | |
| 51 SIGFPE, | |
| 52 #endif | |
| 53 #ifdef SIGQUIT | |
| 54 SIGQUIT, | |
| 55 #endif | |
| 56 0 | |
| 57 }; | |
| 58 | |
| 59 void SDL_InstallParachute(void) | |
| 60 { | |
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61 /* Set a handler for any fatal signal not already handled */ |
| 0 | 62 int i; |
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63 #ifdef HAVE_SIGACTION |
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64 struct sigaction action; |
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65 |
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66 for ( i=0; SDL_fatal_signals[i]; ++i ) { |
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parents:
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67 sigaction(SDL_fatal_signals[i], NULL, &action); |
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68 if ( action.sa_handler == SIG_DFL ) { |
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parents:
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69 action.sa_handler = SDL_Parachute; |
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70 sigaction(SDL_fatal_signals[i], &action, NULL); |
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71 } |
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72 } |
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73 #ifdef SIGALRM |
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74 /* Set SIGALRM to be ignored -- necessary on Solaris */ |
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75 sigaction(SIGALRM, NULL, &action); |
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5a417d2a8603
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parents:
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76 if ( action.sa_handler == SIG_DFL ) { |
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parents:
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77 action.sa_handler = SIG_IGN; |
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861
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Oops, ignore SIGALRM, not 0
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78 sigaction(SIGALRM, &action, NULL); |
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79 } |
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80 #endif |
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parents:
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81 #else |
| 0 | 82 void (*ohandler)(int); |
| 83 | |
| 84 for ( i=0; SDL_fatal_signals[i]; ++i ) { | |
| 85 ohandler = signal(SDL_fatal_signals[i], SDL_Parachute); | |
| 86 if ( ohandler != SIG_DFL ) { | |
| 87 signal(SDL_fatal_signals[i], ohandler); | |
| 88 } | |
| 89 } | |
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parents:
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90 #endif /* HAVE_SIGACTION */ |
| 0 | 91 return; |
| 92 } | |
| 93 | |
| 94 void SDL_UninstallParachute(void) | |
| 95 { | |
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96 /* Remove a handler for any fatal signal handled */ |
| 0 | 97 int i; |
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98 #ifdef HAVE_SIGACTION |
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parents:
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99 struct sigaction action; |
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parents:
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100 |
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parents:
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101 for ( i=0; SDL_fatal_signals[i]; ++i ) { |
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parents:
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102 sigaction(SDL_fatal_signals[i], NULL, &action); |
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parents:
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103 if ( action.sa_handler == SDL_Parachute ) { |
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parents:
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104 action.sa_handler = SIG_DFL; |
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parents:
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105 sigaction(SDL_fatal_signals[i], &action, NULL); |
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106 } |
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107 } |
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108 #else |
| 0 | 109 void (*ohandler)(int); |
| 110 | |
| 111 for ( i=0; SDL_fatal_signals[i]; ++i ) { | |
| 112 ohandler = signal(SDL_fatal_signals[i], SIG_DFL); | |
| 113 if ( ohandler != SDL_Parachute ) { | |
| 114 signal(SDL_fatal_signals[i], ohandler); | |
| 115 } | |
| 116 } | |
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Sam Lantinga <slouken@libsdl.org>
parents:
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117 #endif /* HAVE_SIGACTION */ |
| 0 | 118 } |
| 119 | |
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1330
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It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
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changeset
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120 #else |
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It's now possible to build SDL without any C runtime at all on Windows,
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parents:
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121 |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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122 /* No signals on this platform, nothing to do.. */ |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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123 |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
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124 void SDL_InstallParachute(void) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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125 { |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
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parents:
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126 return; |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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127 } |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
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changeset
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128 |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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129 void SDL_UninstallParachute(void) |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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130 { |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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131 return; |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
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parents:
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132 } |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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133 |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
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parents:
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134 #endif /* HAVE_SIGNAL_H */ |