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CONFIG_VMAP_STACK: Use a virtually-mapped stack

General informations

The Linux kernel configuration item CONFIG_VMAP_STACK:

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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.



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