sys/resource.h
sys/utsname.h pwd.h utmp.h util.h)
-AC_MSG_CHECKING(if personality LINUX32 can be set)
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/personality.h>]], [[personality (PER_LINUX32)]])],
- emacs_cv_personality_linux32=yes,
- emacs_cv_personality_linux32=no)
-AC_MSG_RESULT($emacs_cv_personality_linux32)
-
-if test $emacs_cv_personality_linux32 = yes; then
- AC_DEFINE(HAVE_PERSONALITY_LINUX32, 1,
- [Define to 1 if personality LINUX32 can be set.])
+AC_CACHE_CHECK([for ADDR_NO_RANDOMIZE],
+ [emacs_cv_personality_addr_no_randomize],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[#include <sys/personality.h>]],
+ [[personality (personality (0xffffffff)
+ | ADDR_NO_RANDOMIZE)]])],
+ [emacs_cv_personality_addr_no_randomize=yes],
+ [emacs_cv_personality_addr_no_randomize=no])])
+if test $emacs_cv_personality_addr_no_randomize = yes; then
+ AC_DEFINE([HAVE_PERSONALITY_ADDR_NO_RANDOMIZE], [1],
+ [Define to 1 if personality flag ADDR_NO_RANDOMIZE exists.])
fi
# Note that Solaris has sys/sysinfo.h which defines struct
#include <sys/resource.h>
#endif
-#ifdef HAVE_PERSONALITY_LINUX32
+#ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
#include <sys/personality.h>
#endif
dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
|| strcmp (argv[argc - 1], "bootstrap") == 0);
-#ifdef HAVE_PERSONALITY_LINUX32
- if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
+#ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
+ if (dumping)
{
- /* Set this so we only do this once. */
- xputenv ("EMACS_HEAP_EXEC=true");
-
- /* A flag to turn off address randomization which is introduced
- in linux kernel shipped with fedora core 4 */
-#define ADD_NO_RANDOMIZE 0x0040000
- personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
-#undef ADD_NO_RANDOMIZE
-
- execvp (argv[0], argv);
+ int pers = personality (0xffffffff);
+ if (! (pers & ADDR_NO_RANDOMIZE)
+ && 0 <= personality (pers | ADDR_NO_RANDOMIZE))
+ {
+ /* Address randomization was enabled, but is now disabled.
+ Re-execute Emacs to get a clean slate. */
+ execvp (argv[0], argv);
- /* If the exec fails, try to dump anyway. */
- emacs_perror (argv[0]);
+ /* If the exec fails, warn and then try without a clean slate. */
+ perror (argv[0]);
+ }
}
-#endif /* HAVE_PERSONALITY_LINUX32 */
+#endif
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK) && !defined (CYGWIN)
/* Extend the stack space available. Don't do that if dumping,