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Message-ID: <20220427095916.17515-2-lecopzer.chen@mediatek.com>
Date: Wed, 27 Apr 2022 17:59:15 +0800
From: Lecopzer Chen <lecopzer.chen@...iatek.com>
To: <linus.walleij@...aro.org>, <linux@...linux.org.uk>
CC: <lecopzer.chen@...iatek.com>, <andreyknvl@...il.com>,
<anshuman.khandual@....com>, <ardb@...nel.org>, <arnd@...db.de>,
<dvyukov@...gle.com>, <geert+renesas@...der.be>,
<glider@...gle.com>, <kasan-dev@...glegroups.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <lukas.bulwahn@...il.com>,
<mark.rutland@....com>, <masahiroy@...nel.org>,
<matthias.bgg@...il.com>, <rmk+kernel@...linux.org.uk>,
<ryabinin.a.a@...il.com>, <yj.chiang@...iatek.com>
Subject: [PATCH v5 1/2] arm: kasan: support CONFIG_KASAN_VMALLOC
Simply make shadow of vmalloc area mapped on demand.
Since the virtual address of vmalloc for Arm is also between
MODULE_VADDR and 0x100000000 (ZONE_HIGHMEM), which means the shadow
address has already included between KASAN_SHADOW_START and
KASAN_SHADOW_END.
Thus we need to change nothing for memory map of Arm.
This can fix ARM_MODULE_PLTS with KASan, support KASan for higmem
and support CONFIG_VMAP_STACK with KASan.
Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
Tested-by: Linus Walleij <linus.walleij@...aro.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
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 2e8091e2d8a8..f440cf59cea1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -75,6 +75,7 @@ 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) {
--
2.18.0
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