linux-kernel - [PATCH 4/7] UML - Fix stack alignment

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Message-Id: <200607280306.k6S36NFb007936@ccure.user-mode-linux.org>
Date:	Thu, 27 Jul 2006 23:06:23 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	akpm@...l.org
cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net,
	Frank van Maarseveen <frankvm@...nkvm.com>
Subject: [PATCH 4/7] UML - Fix stack alignment

Stack randomization needs to be conditional on the personality allowing it.

Signed-off-by: Jeff Dike <jdike@...toit.com>

Index: linux-2.6.17/arch/um/kernel/process_kern.c
===================================================================
--- linux-2.6.17.orig/arch/um/kernel/process_kern.c	2006-06-17 21:49:35.000000000 -0400
+++ linux-2.6.17/arch/um/kernel/process_kern.c	2006-07-13 15:05:02.000000000 -0400
@@ -23,6 +23,7 @@
 #include "linux/proc_fs.h"
 #include "linux/ptrace.h"
 #include "linux/random.h"
+#include "linux/personality.h"
 #include "asm/unistd.h"
 #include "asm/mman.h"
 #include "asm/segment.h"
@@ -476,7 +477,7 @@ int singlestepping(void * t)
 #ifndef arch_align_stack
 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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