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From: Lecopzer Chen <lecopzer.chen@mediatek.com>
To: <linux-kernel@vger.kernel.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	"Andrey Konovalov" <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Linus Walleij <linus.walleij@linaro.org>,
	<rmk+kernel@armlinux.org.uk>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	Ard Biesheuvel <ardb@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Lukas Bulwahn <lukas.bulwahn@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kasan-dev@googlegroups.com>, <yj.chiang@mediatek.com>,
	Lecopzer Chen <lecopzer.chen@mediatek.com>
Subject: [PATCH 1/2] arm: kasan: support CONFIG_KASAN_VMALLOC
Date: Tue, 18 Jan 2022 17:44:49 +0800	[thread overview]
Message-ID: <20220118094450.7730-2-lecopzer.chen@mediatek.com> (raw)
In-Reply-To: <20220118094450.7730-1-lecopzer.chen@mediatek.com>

Simply make shadow of vmalloc area mapped on demand.

This can fix ARM_MODULE_PLTS with KASAN and provide first step
to support CONFIG_VMAP_STACK in ARM.

Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
---
 arch/arm/Kconfig         | 1 +
 arch/arm/mm/kasan_init.c | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fabe39169b12..f97f2c416be0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -72,6 +72,7 @@ config ARM
 	select HAVE_ARCH_KFENCE if MMU && !XIP_KERNEL
 	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
 	select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
+	select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_PFN_VALID
 	select HAVE_ARCH_SECCOMP
diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 5ad0d6c56d56..29caee9c79ce 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -236,7 +236,11 @@ void __init kasan_init(void)
 
 	clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
 
-	kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
+	if (!IS_ENABLED(CONFIG_KASAN_VMALLOC))
+		kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
+					    kasan_mem_to_shadow((void *)VMALLOC_END));
+
+	kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_END),
 				    kasan_mem_to_shadow((void *)-1UL) + 1);
 
 	for_each_mem_range(i, &pa_start, &pa_end) {
-- 
2.25.1


_______________________________________________
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WARNING: multiple messages have this Message-ID (diff)
From: Lecopzer Chen <lecopzer.chen@mediatek.com>
To: <linux-kernel@vger.kernel.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	"Andrey Konovalov" <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Linus Walleij <linus.walleij@linaro.org>,
	<rmk+kernel@armlinux.org.uk>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	Ard Biesheuvel <ardb@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Lukas Bulwahn <lukas.bulwahn@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kasan-dev@googlegroups.com>, <yj.chiang@mediatek.com>,
	Lecopzer Chen <lecopzer.chen@mediatek.com>
Subject: [PATCH 1/2] arm: kasan: support CONFIG_KASAN_VMALLOC
Date: Tue, 18 Jan 2022 17:44:49 +0800	[thread overview]
Message-ID: <20220118094450.7730-2-lecopzer.chen@mediatek.com> (raw)
In-Reply-To: <20220118094450.7730-1-lecopzer.chen@mediatek.com>

Simply make shadow of vmalloc area mapped on demand.

This can fix ARM_MODULE_PLTS with KASAN and provide first step
to support CONFIG_VMAP_STACK in ARM.

Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
---
 arch/arm/Kconfig         | 1 +
 arch/arm/mm/kasan_init.c | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fabe39169b12..f97f2c416be0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -72,6 +72,7 @@ config ARM
 	select HAVE_ARCH_KFENCE if MMU && !XIP_KERNEL
 	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
 	select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
+	select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_PFN_VALID
 	select HAVE_ARCH_SECCOMP
diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 5ad0d6c56d56..29caee9c79ce 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -236,7 +236,11 @@ void __init kasan_init(void)
 
 	clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
 
-	kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
+	if (!IS_ENABLED(CONFIG_KASAN_VMALLOC))
+		kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
+					    kasan_mem_to_shadow((void *)VMALLOC_END));
+
+	kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_END),
 				    kasan_mem_to_shadow((void *)-1UL) + 1);
 
 	for_each_mem_range(i, &pa_start, &pa_end) {
-- 
2.25.1


  reply	other threads:[~2022-01-18  9:46 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-18  9:44 [PATCH 0/2] arm: kasan: support CONFIG_KASAN_VMALLOC Lecopzer Chen
2022-01-18  9:44 ` Lecopzer Chen
2022-01-18  9:44 ` Lecopzer Chen [this message]
2022-01-18  9:44   ` [PATCH 1/2] " Lecopzer Chen
2022-01-18  9:44 ` [PATCH 2/2] arm: kconfig: fix MODULE_PLTS for KASAN with KASAN_VMALLOC Lecopzer Chen
2022-01-18  9:44   ` Lecopzer Chen
  -- strict thread matches above, loose matches on Subject: below --
2022-05-06  6:01 [PATCH 1/2] ARM: kasan: Support CONFIG_KASAN_VMALLOC Alexander A Sverdlin
2022-05-06  6:01 ` Alexander A Sverdlin

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