Name: Upstream Kernel Hardening: Progress on Enabling -Wflex-array-member-not-at-end - Gustavo A. R. Silva, The Linux Foundation
Start: 2025-08-25T13:30:00+0200
End: 2025-08-25T14:10:00+0200

25-27, August 2025
Amsterdam, Netherlands
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Monday August 25, 2025 13:30 - 14:10 CEST

G102-103

The -Wflex-array-member-not-at-end compiler option was introduced in GCC 14. At the time, it revealed around 60,000 warnings in the upstream Linux kernel. While many of these were duplicates, about 650 are unique and require individual auditing and attention. These issues span different categories and vary in complexity, which adds to the challenge of globally enabling this compiler option in the upstream Linux kernel.

In this presentation, we'll share the progress we've made on this work as part of the Kernel Self-Protection Project (KSPP) over the past few months. We'll go over the challenges we've encountered, show concrete code examples, and demonstrate how to fix these kinds of problems. We'll also discuss why enabling this option is important for the kernel, and how we plan to complete this work in the near future.

Whether you're a seasoned kernel developer or someone looking to start contributing upstream, this presentation will introduce useful helpers and strategies you can use to fix existing code or implement new functionality, and in doing so, help us harden the upstream Linux kernel for the benefit of everyone.

Speakers

Gustavo A. R. Silva

Upstream Linux Kernel Engineer, The Linux Foundation

Gustavo A. R. Silva is an Upstream Linux Kernel Engineer focused on hardening and proactive security. He has spent the past several years fixing all sorts of bugs and hardening the Linux kernel. His work is supported by The Linux Foundation and Alpha-Omega. He's a member of the Kernel... Read More →

Monday August 25, 2025 13:30 - 14:10 CEST
G102-103

Linux

Audience Experience Level Any

Open Source Summit Europe 2025

Gustavo A. R. Silva

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