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CONFIG_KASAN_VMALLOC: Back mappings in vmalloc space with real shadow memory

General informations

The Linux kernel configuration item CONFIG_KASAN_VMALLOC:

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By default, the shadow region for vmalloc space is the read-only zero page. This means that KASAN cannot detect errors involving vmalloc space.

Enabling this option will hook in to vmap/vmalloc and back those mappings with real shadow memory allocated on demand. This allows for KASAN to detect more sorts of errors (and to support vmapped stacks), but at the cost of higher memory usage.

Hardware

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