linux-kernel - [RFC/PATCH RESEND -next 02/21] init: main: initialize kasan's shadow area on boot

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Message-id: <1404905415-9046-3-git-send-email-a.ryabinin@samsung.com>
Date:	Wed, 09 Jul 2014 15:29:56 +0400
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Alexey Preobrazhensky <preobr@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Michal Marek <mmarek@...e.cz>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org, linux-mm@...ck.org,
	Andrey Ryabinin <a.ryabinin@...sung.com>
Subject: [RFC/PATCH RESEND -next 02/21] init: main: initialize kasan's shadow
 area on boot

This patch initializes shadow area after it was allocated by arch code.
All low memory marked as accessible except shadow area itself.
Later free_all_bootmem() will release pages to buddy allocator
and these pages will be marked as unaccessible, untill somebody
will allocate them.

Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>
---
 init/main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/init/main.c b/init/main.c
index bb1aed9..d06a636 100644
--- a/init/main.c
+++ b/init/main.c
@@ -78,6 +78,7 @@
 #include <linux/context_tracking.h>
 #include <linux/random.h>
 #include <linux/list.h>
+#include <linux/kasan.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -549,7 +550,7 @@ asmlinkage __visible void __init start_kernel(void)
 			   set_init_arg);
 
 	jump_label_init();
-
+	kasan_init_shadow();
 	/*
 	 * These use large bootmem allocations and must precede
 	 * kmem_cache_init()
-- 
1.8.5.5

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