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/* Disable address space randomization based on inferior personality.
Copyright (C) 2008-2021 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 "gdbsupport/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 */
/* See comment on nat/linux-personality.h. */
maybe_disable_address_space_randomization::
maybe_disable_address_space_randomization (int disable_randomization)
: m_personality_set (false),
m_personality_orig (0)
{
#ifdef HAVE_PERSONALITY
if (disable_randomization)
{
errno = 0;
m_personality_orig = personality (0xffffffff);
if (errno == 0 && !(m_personality_orig & ADDR_NO_RANDOMIZE))
{
m_personality_set = true;
personality (m_personality_orig | ADDR_NO_RANDOMIZE);
}
if (errno != 0 || (m_personality_set
&& !(personality (0xffffffff) & ADDR_NO_RANDOMIZE)))
warning (_("Error disabling address space randomization: %s"),
safe_strerror (errno));
}
#endif /* HAVE_PERSONALITY */
}
maybe_disable_address_space_randomization::
~maybe_disable_address_space_randomization ()
{
#ifdef HAVE_PERSONALITY
if (m_personality_set)
{
errno = 0;
personality (m_personality_orig);
if (errno != 0)
warning (_("Error restoring address space randomization: %s"),
safe_strerror (errno));
}
#endif /* HAVE_PERSONALITY */
}
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