[Openmcl-cvs-notifications] r11580 - in /trunk/source/lisp-kernel/linuxppc: Makefile elf32ppclinux.x

[gb at clozure.com]

Author: gb
Date: Mon Jan  5 00:36:35 2009
New Revision: 11580

Log:
Set executable_start to 64K (not 4K).  Some Linux kernels get upset
by the presence of code < 64K, and only calm down if the vm.mmap_min_addr
sysctl variable is set to 0.  If we move code out of the low 64K (and
remap_spjump() at startup), the sysctl variable can be set to 4K, which
offers some protection against theoretical exploits.

Disable format warnings.

Modified:
    trunk/source/lisp-kernel/linuxppc/Makefile
    trunk/source/lisp-kernel/linuxppc/elf32ppclinux.x

Modified: trunk/source/lisp-kernel/linuxppc/Makefile
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D
--- trunk/source/lisp-kernel/linuxppc/Makefile (original)
+++ trunk/source/lisp-kernel/linuxppc/Makefile Mon Jan  5 00:36:35 2009
@@ -25,6 +25,9 @@
 CDEFINES =3D -DLINUX -DPPC -D_REENTRANT -D_GNU_SOURCE
 CDEBUG =3D -g
 COPT =3D -O2
+# Once in a while, -Wformat says something useful.  The odds are against t=
hat,
+# however.
+WFORMAT =3D -Wno-format
 =

 # If the linker supports a "--hash-style=3D" option, use traditional
 # Sysv hash tables.  (If it doesn't support that option, assume
@@ -52,7 +55,7 @@
 .s.o:
 	$(M4) $(M4FLAGS) -I../ $< | $(AS) $(A32) $(ASFLAGS) -o $@
 .c.o:
-	$(CC) -c $< $(CDEFINES) $(CDEBUG) $(COPT) $(PPC32) -o $@
+	$(CC) -c $< $(CDEFINES) $(CDEBUG) $(COPT) $(WFORMAT) $(PPC32) -o $@
 =

 SPOBJ =3D pad.o ppc-spjump.o ppc-spentry.o ppc-subprims.o
 ASMOBJ =3D ppc-asmutils.o imports.o

Modified: trunk/source/lisp-kernel/linuxppc/elf32ppclinux.x
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D
--- trunk/source/lisp-kernel/linuxppc/elf32ppclinux.x (original)
+++ trunk/source/lisp-kernel/linuxppc/elf32ppclinux.x Mon Jan  5 00:36:35 2=
009
@@ -8,8 +8,8 @@
 VERSION {default { global : __trampoline_setup ;  } ;}
 SECTIONS
 {
-  PROVIDE (__executable_start =3D 0x00001000);
-  . =3D 0x00001000;
+  PROVIDE (__executable_start =3D 0x00010000);
+  . =3D 0x00010000 + SIZEOF_HEADERS;
   .pad : { pad.o(.text) }
   .subprims ALIGN(0x1000)    :  =

   {