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;
+}
--
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
