| /* Disable address space randomization based on inferior personality. |
| |
| Copyright (C) 2008-2017 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "common-defs.h" |
| #include "nat/linux-personality.h" |
| |
| #ifdef HAVE_PERSONALITY |
| # include <sys/personality.h> |
| # if !HAVE_DECL_ADDR_NO_RANDOMIZE |
| # define ADDR_NO_RANDOMIZE 0x0040000 |
| # endif /* ! HAVE_DECL_ADDR_NO_RANDOMIZE */ |
| #endif /* HAVE_PERSONALITY */ |
| |
| #ifdef HAVE_PERSONALITY |
| |
| /* Restore address space randomization of the inferior. ARG is the |
| original inferior's personality value before the address space |
| randomization was disabled. */ |
| |
| static void |
| restore_personality (void *arg) |
| { |
| int personality_orig = (int) (uintptr_t) arg; |
| |
| errno = 0; |
| personality (personality_orig); |
| if (errno != 0) |
| warning (_("Error restoring address space randomization: %s"), |
| safe_strerror (errno)); |
| } |
| #endif /* HAVE_PERSONALITY */ |
| |
| /* Return a cleanup responsible for restoring the inferior's |
| personality (and restoring the inferior's address space |
| randomization) if HAVE_PERSONALITY and if PERSONALITY_SET is not |
| zero; return a null cleanup if not HAVE_PERSONALITY or if |
| PERSONALITY_SET is zero. */ |
| |
| static struct cleanup * |
| make_disable_asr_cleanup (int personality_set, int personality_orig) |
| { |
| #ifdef HAVE_PERSONALITY |
| if (personality_set != 0) |
| return make_cleanup (restore_personality, |
| (void *) (uintptr_t) personality_orig); |
| #endif /* HAVE_PERSONALITY */ |
| |
| return make_cleanup (null_cleanup, NULL); |
| } |
| |
| /* See comment on nat/linux-personality.h. */ |
| |
| struct cleanup * |
| maybe_disable_address_space_randomization (int disable_randomization) |
| { |
| int personality_orig = 0; |
| int personality_set = 0; |
| |
| #ifdef HAVE_PERSONALITY |
| if (disable_randomization) |
| { |
| errno = 0; |
| personality_orig = personality (0xffffffff); |
| if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) |
| { |
| personality_set = 1; |
| personality (personality_orig | ADDR_NO_RANDOMIZE); |
| } |
| if (errno != 0 || (personality_set |
| && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) |
| warning (_("Error disabling address space randomization: %s"), |
| safe_strerror (errno)); |
| } |
| #endif /* HAVE_PERSONALITY */ |
| |
| return make_disable_asr_cleanup (personality_set, |
| personality_orig); |
| } |