From 784bd0f8d7303ff0025e2ea44b68b6fc6323544d Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Thu, 23 Jun 2016 15:20:59 -0700
Subject: mm: SLAB hardened usercopy support

Under CONFIG_HARDENED_USERCOPY, this adds object size checking to the
SLAB allocator to catch any copies that may span objects.

Based on code from PaX and grsecurity.

Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
(cherry picked from commit 04385fc5e8fffed84425d909a783c0f0c587d847)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

(limited to 'init')

diff --git a/init/Kconfig b/init/Kconfig
index 235c7a2c0d20..fa031a140397 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1719,6 +1719,7 @@ choice
 
 config SLAB
 	bool "SLAB"
+	select HAVE_HARDENED_USERCOPY_ALLOCATOR
 	help
 	  The regular slab allocator that is established and known to work
 	  well in all environments. It organizes cache hot objects in
-- 
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