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