Randomise ELF_ET_DYN_BASE, which is used when loading position independent
executables.

Signed-off-by: Anton Blanchard <an...@samba.org>
---

Index: linux-2.6/arch/powerpc/include/asm/elf.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/elf.h       2009-02-22 
21:18:04.000000000 +1100
+++ linux-2.6/arch/powerpc/include/asm/elf.h    2009-02-22 21:34:49.000000000 
+1100
@@ -178,7 +178,8 @@
    the loader.  We need to make sure that it is out of the way of the program
    that it will "exec", and that there is sufficient room for the brk.  */
 
-#define ELF_ET_DYN_BASE         (0x20000000)
+extern unsigned long randomize_et_dyn(unsigned long base);
+#define ELF_ET_DYN_BASE                (randomize_et_dyn(0x20000000))
 
 /*
  * Our registers are always unsigned longs, whether we're a 32 bit
Index: linux-2.6/arch/powerpc/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/process.c        2009-02-22 
21:21:14.000000000 +1100
+++ linux-2.6/arch/powerpc/kernel/process.c     2009-02-22 21:36:02.000000000 
+1100
@@ -1154,3 +1154,13 @@
 
        return ret;
 }
+
+unsigned long randomize_et_dyn(unsigned long base)
+{
+       unsigned long ret = PAGE_ALIGN(base + brk_rnd());
+
+       if (ret < base)
+               return base;
+
+       return ret;
+}

-- 
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