1 /* Disable address space randomization based on inferior personality.
3 Copyright (C) 2008-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #include "common-defs.h"
21 #include "nat/linux-personality.h"
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 */
30 #ifdef HAVE_PERSONALITY
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. */
37 restore_personality (void *arg
)
39 int personality_orig
= (int) (uintptr_t) arg
;
42 personality (personality_orig
);
44 warning (_("Error restoring address space randomization: %s"),
45 safe_strerror (errno
));
47 #endif /* HAVE_PERSONALITY */
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. */
55 static struct cleanup
*
56 make_disable_asr_cleanup (int personality_set
, int personality_orig
)
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 */
64 return make_cleanup (null_cleanup
, NULL
);
67 /* See comment on nat/linux-personality.h. */
70 maybe_disable_address_space_randomization (int disable_randomization
)
72 int personality_orig
= 0;
73 int personality_set
= 0;
75 #ifdef HAVE_PERSONALITY
76 if (disable_randomization
)
79 personality_orig
= personality (0xffffffff);
80 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
83 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
85 if (errno
!= 0 || (personality_set
86 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
87 warning (_("Error disabling address space randomization: %s"),
88 safe_strerror (errno
));
90 #endif /* HAVE_PERSONALITY */
92 return make_disable_asr_cleanup (personality_set
,
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