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linux-personality.c
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1 /* Disable address space randomization based on inferior personality.
2
3 Copyright (C) 2008-2018 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>
25 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
26 # define ADDR_NO_RANDOMIZE 0x0040000
27 # endif /* ! HAVE_DECL_ADDR_NO_RANDOMIZE */
28 #endif /* HAVE_PERSONALITY */
29
30 /* See comment on nat/linux-personality.h. */
31
32 maybe_disable_address_space_randomization::
33 maybe_disable_address_space_randomization (int disable_randomization)
34 : m_personality_set (false),
35 m_personality_orig (0)
36 {
37 #ifdef HAVE_PERSONALITY
38 if (disable_randomization)
39 {
40 errno = 0;
41 m_personality_orig = personality (0xffffffff);
42 if (errno == 0 && !(m_personality_orig & ADDR_NO_RANDOMIZE))
43 {
44 m_personality_set = true;
45 personality (m_personality_orig | ADDR_NO_RANDOMIZE);
46 }
47 if (errno != 0 || (m_personality_set
48 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE)))
49 warning (_("Error disabling address space randomization: %s"),
50 safe_strerror (errno));
51 }
52 #endif /* HAVE_PERSONALITY */
53 }
54
55 maybe_disable_address_space_randomization::
56 ~maybe_disable_address_space_randomization ()
57 {
58 #ifdef HAVE_PERSONALITY
59
60 if (m_personality_set)
61 {
62 errno = 0;
63 personality (m_personality_orig);
64 if (errno != 0)
65 warning (_("Error restoring address space randomization: %s"),
66 safe_strerror (errno));
67 }
68 #endif /* HAVE_PERSONALITY */
69 }
maybe_disable_address_space_randomization::maybe_disable_address_space_randomization
maybe_disable_address_space_randomization(int disable_randomization)
Definition: linux-personality.c:33
warning
void warning(const char *fmt,...)
Definition: errors.c:26
disable_randomization
int disable_randomization
Definition: infrun.c:175
_
#define _(String)
Definition: gdb_locale.h:35
linux-personality.h
common-defs.h
maybe_disable_address_space_randomization::m_personality_orig
int m_personality_orig
Definition: linux-personality.h:43
maybe_disable_address_space_randomization::~maybe_disable_address_space_randomization
~maybe_disable_address_space_randomization()
Definition: linux-personality.c:56
safe_strerror
char * safe_strerror(int)
Definition: mingw-strerror.c:32
maybe_disable_address_space_randomization::m_personality_set
bool m_personality_set
Definition: linux-personality.h:40