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GCC changes add forward-edge CFI support for the Linux kernel

lwn.net by corbet Editor score 7/10

Kees Cook presented GCC changes to support forward-edge control-flow integrity in the kernel. Compiler-backed CFI is a defense against control-flow-diversion exploits, relevant to teams hardening low-level systems.

What

GCC changes add forward-edge control-flow integrity support for the Linux kernel.

How

CFI aims to prevent or detect exploits that divert control flow from intended paths; Kees Cook presented the GCC changes at the 2026 GNU Tools Cauldron.

Why it matters

Kernel engineers can use compiler support to strengthen defenses against unintended control-flow transfers.

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