CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT: Default state of kernel stack offset randomization

General informations

The Linux kernel configuration item CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT has multiple definitions:

Default state of kernel stack offset randomization found in arch/Kconfig

The configuration item CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT:

• prompt: Default state of kernel stack offset randomization
• type: bool
• depends on: CONFIG_RANDOMIZE_KSTACK_OFFSET
• defined in arch/Kconfig
• found in Linux kernels: 5.18–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Kernel stack offset randomization is controlled by kernel boot param "randomize_kstack_offset=on/off", and this config chooses the default boot state.

Randomize kernel stack offset on syscall entry found in arch/Kconfig

The configuration item CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT:

• prompt: Randomize kernel stack offset on syscall entry
• type: bool
• depends on: CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
• defined in arch/Kconfig
• found in Linux kernels: 5.13–5.17

Help text

The kernel stack offset can be randomized (after pt_regs) by roughly 5 bits of entropy, frustrating memory corruption attacks that depend on stack address determinism or cross-syscall address exposures. This feature is controlled by kernel boot param "randomize_kstack_offset=on/off", and this config chooses the default boot state.

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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