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101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/* noaslr.c: Disable ASLR on OS X Mavericks
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*
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* $Id: //info.ravenbrook.com/project/mps/master/code/eventcnv.c#26 $
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* Copyright (c) 2014-2020 Ravenbrook Limited. See end of file for license.
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*
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* This is a command-line tool that runs another program with address
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* space layout randomization (ASLR) disabled.
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*
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* The technique is taken from GDB via "How gdb disables ASLR in Mac
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* OS X Lion"
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* <http://reverse.put.as/2011/08/11/how-gdb-disables-aslr-in-mac-os-x-lion/>
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*
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* On OS X Mavericks, the _POSIX_SPAWN_DISABLE_ASLR constant is not
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* defined in any header, but the LLDB sources reveal its value, and
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* experimentally this value works.
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* <https://llvm.org/svn/llvm-project/lldb/trunk/tools/darwin-debug/darwin-debug.cpp>
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*/
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#include <errno.h>
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#include <spawn.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef _POSIX_SPAWN_DISABLE_ASLR
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#define _POSIX_SPAWN_DISABLE_ASLR 0x100
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#endif
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int main(int argc, char **argv)
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{
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extern char **environ;
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pid_t pid;
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posix_spawnattr_t attr;
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int res, status = 1;
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const char *program = argv[0];
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char *default_argv[] = {"/bin/sh", NULL};
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if (argc >= 2)
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++ argv;
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else
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argv = default_argv;
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res = posix_spawnattr_init(&attr);
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if (res != 0) {
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errno = res;
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perror(program);
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return res;
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}
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res = posix_spawnattr_setflags(&attr, _POSIX_SPAWN_DISABLE_ASLR);
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if (res != 0) {
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errno = res;
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perror(program);
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return res;
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}
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res = posix_spawn(&pid, argv[0], NULL, &attr, argv, environ);
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if (res != 0) {
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errno = res;
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perror(program);
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return res;
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}
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if (waitpid(pid, &status, 0) == -1)
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return 1;
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if (!WIFEXITED(status))
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return 1;
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return WEXITSTATUS(status);
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2014-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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