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Disable memory randomization for the temacs binary via PaX flags
if the paxctl utility is available.
https://bugs.gentoo.org/411439
http://debbugs.gnu.org/11398
--- emacs-24.1-orig/configure.in
+++ emacs-24.1/configure.in
@@ -756,6 +756,8 @@
AC_PATH_PROG(INSTALL_INFO, install-info,:, /sbin)
dnl Don't use GZIP, which is used by gzip for additional parameters.
AC_PATH_PROG(GZIP_PROG, gzip)
+AC_PATH_PROG(PAXCTL, paxctl,,
+ [$PATH$PATH_SEPARATOR/sbin$PATH_SEPARATOR/usr/sbin])
## Need makeinfo >= 4.6 (?) to build the manuals.
--- emacs-24.1-orig/src/Makefile.in
+++ emacs-24.1/src/Makefile.in
@@ -116,6 +116,12 @@
## $LDFLAGS or empty if NS_IMPL_GNUSTEP (for some reason).
TEMACS_LDFLAGS2 = @TEMACS_LDFLAGS2@
+## If available, the full path to the paxctl program.
+## On grsecurity/PaX systems, unexec will fail due to a gap between
+## the bss section and the heap. This can be prevented by disabling
+## memory randomization in temacs with "paxctl -r". See bug#11398.
+PAXCTL = @PAXCTL@
+
## Some systems define this to request special libraries.
LIBS_SYSTEM=@LIBS_SYSTEM@
@@ -406,6 +412,7 @@
-f list-load-path-shadows || true; \
else \
LC_ALL=C $(RUN_TEMACS) -batch -l loadup dump || exit 1; \
+ test "X$(PAXCTL)" = X || $(PAXCTL) -zex emacs$(EXEEXT); \
ln -f emacs$(EXEEXT) bootstrap-emacs$(EXEEXT); \
./emacs -batch -f list-load-path-shadows || true; \
fi
@@ -453,6 +460,8 @@
temacs$(EXEEXT): $(START_FILES) stamp-oldxmenu $(obj) $(otherobj) $(lib)/libgnu.a
$(CC) $(LD_FIRSTFLAG) $(ALL_CFLAGS) $(TEMACS_LDFLAGS) $(TEMACS_LDFLAGS2) \
-o temacs $(START_FILES) $(obj) $(otherobj) $(lib)/libgnu.a $(LIBES)
+ test "$(CANNOT_DUMP)" = "yes" || \
+ test "X$(PAXCTL)" = X || $(PAXCTL) -r temacs$(EXEEXT)
## The following oldxmenu-related rules are only (possibly) used if
## HAVE_X11 && !USE_GTK, but there is no harm in always defining them
@@ -600,6 +609,7 @@
ln -f temacs$(EXEEXT) bootstrap-emacs$(EXEEXT); \
else \
$(RUN_TEMACS) --batch --load loadup bootstrap || exit 1; \
+ test "X$(PAXCTL)" = X || $(PAXCTL) -zex emacs$(EXEEXT); \
mv -f emacs$(EXEEXT) bootstrap-emacs$(EXEEXT); \
fi
@: Compile some files earlier to speed up further compilation.
|
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