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