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Date: Mon,  8 Apr 2019 19:04:18 +0200
From: Alexander Potapenko <glider@...gle.com>
To: yamada.masahiro@...ionext.com, jmorris@...ei.org, serge@...lyn.com
Cc: linux-security-module@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	ndesaulniers@...gle.com, kcc@...gle.com, dvyukov@...gle.com, 
	keescook@...omium.org, sspatil@...roid.com, 
	kernel-hardening@...ts.openwall.com
Subject: [PATCH v3 2/2] initmem: introduce CONFIG_INIT_ALL_HEAP

This config option enables CONFIG_SLUB_DEBUG and CONFIG_PAGE_POISONING
without the need to pass any boot parameters.

No performance optimizations are done at the moment to reduce double
initialization of memory regions.

Signed-off-by: Alexander Potapenko <glider@...gle.com>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: James Morris <jmorris@...ei.org>
Cc: "Serge E. Hallyn" <serge@...lyn.com>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Kostya Serebryany <kcc@...gle.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Sandeep Patil <sspatil@...roid.com>
Cc: linux-security-module@...r.kernel.org
Cc: linux-kbuild@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com
---
 v3:
  - addressed comments by Masahiro Yamada (Kconfig fixes)
---
 mm/page_poison.c         |  5 +++++
 mm/slub.c                |  2 ++
 security/Kconfig.initmem | 11 +++++++++++
 3 files changed, 18 insertions(+)

diff --git a/mm/page_poison.c b/mm/page_poison.c
index 21d4f97cb49b..a1985f33f635 100644
--- a/mm/page_poison.c
+++ b/mm/page_poison.c
@@ -12,9 +12,14 @@ static bool want_page_poisoning __read_mostly;
 
 static int __init early_page_poison_param(char *buf)
 {
+#ifdef CONFIG_INIT_ALL_HEAP
+	want_page_poisoning = true;
+	return 0;
+#else
 	if (!buf)
 		return -EINVAL;
 	return strtobool(buf, &want_page_poisoning);
+#endif
 }
 early_param("page_poison", early_page_poison_param);
 
diff --git a/mm/slub.c b/mm/slub.c
index 1b08fbcb7e61..00e0197d3f35 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1287,6 +1287,8 @@ static int __init setup_slub_debug(char *str)
 	if (*str == ',')
 		slub_debug_slabs = str + 1;
 out:
+	if (IS_ENABLED(CONFIG_INIT_ALL_HEAP))
+		slub_debug |= SLAB_POISON;
 	return 1;
 }
 
diff --git a/security/Kconfig.initmem b/security/Kconfig.initmem
index 5e49a55382ad..37cc10a2eeb5 100644
--- a/security/Kconfig.initmem
+++ b/security/Kconfig.initmem
@@ -13,6 +13,17 @@ config INIT_ALL_MEMORY
 
 if INIT_ALL_MEMORY
 
+config INIT_ALL_HEAP
+	bool "Initialize all heap"
+	depends on INIT_ALL_MEMORY
+	select PAGE_POISONING
+	select PAGE_POISONING_NO_SANITY
+	select PAGE_POISONING_ZERO
+	select SLUB_DEBUG if SLUB
+	default y
+	help
+	  Enable page poisoning and SLUB poisoning by default.
+
 config INIT_ALL_STACK
 	bool "Initialize all stack"
 	depends on INIT_ALL_MEMORY
-- 
2.21.0.392.gf8f6787159e-goog

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