[PATCH v2 1/2] arm: kasan: support CONFIG_KASAN_VMALLOC

[Lecopzer Chen]

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@xxxxxxxxxxxx>
---
 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 4c97cb40eebb..78250e246cc6 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