CONFIG_SLAB_FREELIST_RANDOM: Randomize slab freelist

General informations

The Linux kernel configuration item CONFIG_SLAB_FREELIST_RANDOM has multiple definitions:

Randomize slab freelist found in mm/Kconfig

The configuration item CONFIG_SLAB_FREELIST_RANDOM:

• prompt: Randomize slab freelist
• type: bool
• depends on: ! CONFIG_SLUB_TINY
• defined in mm/Kconfig
• found in Linux kernels: 5.19, 6.0–6.12

Help text

Randomizes the freelist order used on creating new pages. This security feature reduces the predictability of the kernel slab allocator against heap overflows.

Randomize slab freelist found in init/Kconfig

The configuration item CONFIG_SLAB_FREELIST_RANDOM:

• prompt: Randomize slab freelist
• type: bool
• depends on: CONFIG_SLAB || CONFIG_SLUB
• defined in init/Kconfig
• found in Linux kernels: 5.9–5.18, 5.18+HEAD

Help text

Randomizes the freelist order used on creating new pages. This security feature reduces the predictability of the kernel slab allocator against heap overflows.

SLAB freelist randomization found in init/Kconfig

The configuration item CONFIG_SLAB_FREELIST_RANDOM:

• prompt: SLAB freelist randomization
• type: bool
• depends on: CONFIG_SLAB || CONFIG_SLUB
• defined in init/Kconfig
• found in Linux kernels: 4.7–4.20, 5.0–5.8

Help text

Randomizes the freelist order used on creating new pages. This security feature reduces the predictability of the kernel slab allocator against heap overflows.

Hardware

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Sources

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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