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-rw-r--r--arch/Kconfig9
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index da75bab22eee..7b861fe3f900 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -836,16 +836,17 @@ config HAVE_ARCH_VMAP_STACK
config VMAP_STACK
default y
bool "Use a virtually-mapped stack"
- depends on HAVE_ARCH_VMAP_STACK && !KASAN
+ depends on HAVE_ARCH_VMAP_STACK
+ depends on !KASAN || KASAN_VMALLOC
---help---
Enable this if you want the use virtually-mapped kernel stacks
with guard pages. This causes kernel stack overflows to be
caught immediately rather than causing difficult-to-diagnose
corruption.
- This is presently incompatible with KASAN because KASAN expects
- the stack to map directly to the KASAN shadow map using a formula
- that is incorrect if the stack is in vmalloc space.
+ To use this with KASAN, the architecture must support backing
+ virtual mappings with real shadow memory, and KASAN_VMALLOC must
+ be enabled.
config ARCH_OPTIONAL_KERNEL_RWX
def_bool n