Gustavo A. R. Silva

I talked for more than two hours (135 mins to be precise) about upstream Linux kernel hardening at Okayama University this afternoon. 🐧👨🏽‍💻🎙

I just uploaded my slides here: https://embeddedor.com/blog/presentations/#Enhancing_spatial_safety_Better_array-bounds_checking_in_C_and_Linux_Okayama_University_%E2%80%93Guest_talk

I really enjoyed the session. The students were amazing. They were well prepared and asked a lot of questions. 👏🏼👏🏼

#Linux #OpenSource #Education #Mentoring #Okayama #OkayamaUniversity

"During one of my presentations at Open Source Summit Japan🇯🇵 the past year, I talked about a bug I found while addressing -Wflex-array-member-not-at-end issues in the Linux kernel. [...]

[...] not-at-end FAMs are a compiler extension that may cause undefined behavior, and compilers don't handle the sizes of objects containing them consistently. For this reason, they are now deprecated..[...]"🐧

https://embeddedor.com/blog/2026/04/18/wflex-array-member-not-at-end-and-a-misalignment-bug-in-the-linux-kernel/ 🐧

#Linux

While reviewing one of the patches sent to the linux-hardening list this afternoon, I spotted a bug I introduced in the same code two years ago (on March 5 2024, to be precise).

Over nearly a decade contributing to the Linux kernel, I’ve discovered and fixed many years-old bugs, and it’s always a special feeling. This time is no different. Here to fix what I break! 🙌🏼

https://embeddedor.com/blog/2026/03/17/here-to-fix-what-i-break-fixing-a-2-year-old-bug-in-the-linux-kernel/ 🐧

#Linux #OpenSource

Just did a thing... 🇰🇷 👀 🤞

#OSSummit #LinuxFoundation

New speaker gift! 🐧🎤👨🏽‍💻

#Linux #OpenSource

"-Wflex-array-member-not-at-end and a misalignment bug in the Linux kernel

During one of my presentations at Open Source Summit Japan🇯🇵 the past year, I talked about a bug I found while addressing -Wflex-array-member-not-at-end issues in the Linux kernel. [...]

[...] not-at-end FAMs are a compiler extension that may cause undefined behavior, and compilers don't handle the sizes of objects containing them consistently. For this reason, they are now deprecated..[...]"🐧

https://embeddedor.com/blog/2026/04/18/wflex-array-member-not-at-end-and-a-misalignment-bug-in-the-linux-kernel/

@thomas@social.bau-ha.us hmm... no idea what that smells like 😅