CONFIG_SLAB_BUCKETS: Support allocation from separate kmalloc buckets

General informations

The Linux kernel configuration item CONFIG_SLAB_BUCKETS:

• prompt: Support allocation from separate kmalloc buckets
• type: bool
• depends on: ! CONFIG_SLUB_TINY
• defined in mm/Kconfig
• found in Linux kernels: 6.11–6.14, 6.15-rc+HEAD

Help text

Kernel heap attacks frequently depend on being able to create specifically-sized allocations with user-controlled contents that will be allocated into the same kmalloc bucket as a target object. To avoid sharing these allocation buckets, provide an explicitly separated set of buckets to be used for user-controlled allocations. This may very slightly increase memory fragmentation, though in practice it's only a handful of extra pages since the bulk of user-controlled allocations are relatively long-lived.

If unsure, say Y.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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