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[v3,5/5] arm64: Kconfig: select KASAN_VMALLOC if KANSAN_GENERIC is enabled

Message ID 20210206083552.24394-6-lecopzer.chen@mediatek.com (mailing list archive)
State New, archived
Headers show
Series arm64: kasan: support CONFIG_KASAN_VMALLOC | expand

Commit Message

Lecopzer Chen Feb. 6, 2021, 8:35 a.m. UTC 
Before this patch, someone who wants to use VMAP_STACK when
KASAN_GENERIC enabled must explicitly select KASAN_VMALLOC.

From Will's suggestion [1]:
  > I would _really_ like to move to VMAP stack unconditionally, and
  > that would effectively force KASAN_VMALLOC to be set if KASAN is in use.

Because VMAP_STACK now depends on either HW_TAGS or KASAN_VMALLOC if
KASAN enabled, in order to make VMAP_STACK selected unconditionally,
we bind KANSAN_GENERIC and KASAN_VMALLOC together.

Note that SW_TAGS supports neither VMAP_STACK nor KASAN_VMALLOC now,
so this is the first step to make VMAP_STACK selected unconditionally.

Bind KANSAN_GENERIC and KASAN_VMALLOC together is supposed to cost more
memory at runtime, thus the alternative is using SW_TAGS KASAN instead.

[1]: https://lore.kernel.org/lkml/20210204150100.GE20815@willie-the-truck/

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a8f5a9171a85..9be6a57f6447 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -190,6 +190,7 @@  config ARM64
 	select IOMMU_DMA if IOMMU_SUPPORT
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
+	select KASAN_VMALLOC if KASAN_GENERIC
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH