[PATCH v6 37/39] arm64: select KASAN_VMALLOC for SW/HW_TAGS modes

andrey.konovalov
2022-01-24T19:07:22Z

Generic KASAN already selects KASAN_VMALLOC to allow VMAP_STACK to be
selected unconditionally, see commit acc3042d62cb9 ("arm64: Kconfig:
select KASAN_VMALLOC if KANSAN_GENERIC is enabled").

The same change is needed for SW_TAGS KASAN.

HW_TAGS KASAN does not require enabling KASAN_VMALLOC for VMAP_STACK,
they already work together as is. Still, selecting KASAN_VMALLOC still
makes sense to make vmalloc() always protected. In case any bugs in
KASAN's vmalloc() support are discovered, the command line kasan.vmalloc
flag can be used to disable vmalloc() checking.

Select KASAN_VMALLOC for all KASAN modes for arm64.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>

---

Changes v2->v3:
- Update patch description.

Changes v1->v2:
- Split out this patch.
---
arch/arm64/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6978140edfa4..beefec5c7b90 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -205,7 +205,7 @@ config ARM64
select IOMMU_DMA if IOMMU_SUPPORT
select IRQ_DOMAIN
select IRQ_FORCED_THREADING
- select KASAN_VMALLOC if KASAN_GENERIC
+ select KASAN_VMALLOC if KASAN
select MODULES_USE_ELF_RELA
select NEED_DMA_MAP_STATE
select NEED_SG_DMA_LENGTH