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8cc73a39 SDJ |
1 | /* Disable address space randomization based on inferior personality. |
2 | ||
3 | Copyright (C) 2008-2015 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "common-defs.h" | |
21 | #include "nat/linux-personality.h" | |
22 | ||
23 | #ifdef HAVE_PERSONALITY | |
24 | # include <sys/personality.h> | |
4c347be6 | 25 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE |
8cc73a39 SDJ |
26 | # define ADDR_NO_RANDOMIZE 0x0040000 |
27 | # endif /* ! HAVE_DECL_ADDR_NO_RANDOMIZE */ | |
28 | #endif /* HAVE_PERSONALITY */ | |
29 | ||
30 | #ifdef HAVE_PERSONALITY | |
31 | ||
32 | /* Restore address space randomization of the inferior. ARG is the | |
33 | original inferior's personality value before the address space | |
34 | randomization was disabled. */ | |
35 | ||
36 | static void | |
37 | restore_personality (void *arg) | |
38 | { | |
39 | int personality_orig = (int) (uintptr_t) arg; | |
40 | ||
41 | errno = 0; | |
42 | personality (personality_orig); | |
43 | if (errno != 0) | |
44 | warning (_("Error restoring address space randomization: %s"), | |
45 | safe_strerror (errno)); | |
46 | } | |
47 | #endif /* HAVE_PERSONALITY */ | |
48 | ||
49 | /* Return a cleanup responsible for restoring the inferior's | |
50 | personality (and restoring the inferior's address space | |
51 | randomization) if HAVE_PERSONALITY and if PERSONALITY_SET is not | |
52 | zero; return a null cleanup if not HAVE_PERSONALITY or if | |
53 | PERSONALITY_SET is zero. */ | |
54 | ||
55 | static struct cleanup * | |
56 | make_disable_asr_cleanup (int personality_set, int personality_orig) | |
57 | { | |
58 | #ifdef HAVE_PERSONALITY | |
59 | if (personality_set != 0) | |
60 | return make_cleanup (restore_personality, | |
61 | (void *) (uintptr_t) personality_orig); | |
62 | #endif /* HAVE_PERSONALITY */ | |
63 | ||
64 | return make_cleanup (null_cleanup, NULL); | |
65 | } | |
66 | ||
67 | /* See comment on nat/linux-personality.h. */ | |
68 | ||
69 | struct cleanup * | |
70 | maybe_disable_address_space_randomization (int disable_randomization) | |
71 | { | |
72 | int personality_orig = 0; | |
73 | int personality_set = 0; | |
74 | ||
75 | #ifdef HAVE_PERSONALITY | |
76 | if (disable_randomization) | |
77 | { | |
78 | errno = 0; | |
79 | personality_orig = personality (0xffffffff); | |
80 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
81 | { | |
82 | personality_set = 1; | |
83 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
84 | } | |
85 | if (errno != 0 || (personality_set | |
86 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
87 | warning (_("Error disabling address space randomization: %s"), | |
88 | safe_strerror (errno)); | |
89 | } | |
90 | #endif /* HAVE_PERSONALITY */ | |
91 | ||
92 | return make_disable_asr_cleanup (personality_set, | |
93 | personality_orig); | |
94 | } |