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CONFIG_RANDOMIZE_KSTACK_OFFSET: Support for randomizing kernel stack offset on syscall entry

General informations

The Linux kernel configuration item CONFIG_RANDOMIZE_KSTACK_OFFSET:

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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.

The feature is controlled via the "randomize_kstack_offset=on/off" kernel boot param, and if turned off has zero overhead due to its use of static branches (see JUMP_LABEL).

If unsure, say Y.

Hardware

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