CONFIG_KASAN_VMALLOC: Back mappings in vmalloc space with real shadow memory

General informations

The Linux kernel configuration item CONFIG_KASAN_VMALLOC:

• prompt: Back mappings in vmalloc space with real shadow memory
• type: bool
• depends on: CONFIG_KASAN_GENERIC && CONFIG_HAVE_ARCH_KASAN_VMALLOC
• defined in lib/Kconfig.kasan
• found in Linux kernels: 5.5–5.14, 5.15-rc+HEAD

Help text

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

LKDDb

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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