[PATCH] x86: Don't randomize stack unless current->personality permits it

[Frank van Maarseveen]

Do not randomize stack location unless current->personality permits it.

Signed-off-by: Frank van Maarseveen <frankvm@xxxxxxxxxxx>
---

The problem seems also present in

	arch/um/kernel/process_kern.c
	arch/x86_64/kernel/process.c

 arch/i386/kernel/process.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -rup a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
--- a/arch/i386/kernel/process.c	2006-06-23 16:08:13.000000000 +0200
+++ b/arch/i386/kernel/process.c	2006-07-11 14:39:20.000000000 +0200
@@ -38,6 +38,7 @@
 #include <linux/kallsyms.h>
 #include <linux/ptrace.h>
 #include <linux/random.h>
+#include <linux/personality.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -898,7 +899,7 @@ asmlinkage int sys_get_thread_area(struc
 
 unsigned long arch_align_stack(unsigned long sp)
 {
-	if (randomize_va_space)
+	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
 		sp -= get_random_int() % 8192;
 	return sp & ~0xf;
 }

-
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