iiinova — where your digital self keeps evolving

Jasper van Woudenberg @jzvw.bsky.social · 25/02/2025

Glad to see we’re able to reach a larger audience! The Chinese version of our book is doing well. @oflynn.com /ht Haisu Lee (our translator)

031

Reposted by Jasper van Woudenberg

dragosr @dragostech.bsky.social · 29/12/2024

Great presentation, glitching the RPi 2350 on an unprotected path (USB VDD, they glitch protect others) to disturb reading critical OTP permission bits to mistakenly enable unsecured RISC-V cores to mess with TrustZone secured ARM cores without any limitations. streaming.media.ccc.de/38c3/relive/...

streaming.media.ccc.de

Relive: Hacking the RP2350 – 38C3: Illegal Instructions Streaming

Live streaming from the 38th Chaos Communication Congress

0124

Reposted by Jasper van Woudenberg

Jonathan Pallant @thejpster.org.uk · 28/12/2024

events.ccc.de/congress/202... You can bypass security on the RP2350 by glitching the OTP power supply (which does not have a glitch detector on it). This causes OTP to supply "guard data" instead of real data, and interpreting the guard data happens to enable RISC-V mode, which can do anything.

events.ccc.de

38c3: Hacking the RP2350

The RP2350 security architecture involves several interconnected mechanisms which together provide authentication of code running on the chip, protected one-time-programmable storage, fine-grained con...

47916

Jasper van Woudenberg @jzvw.bsky.social · 09/12/2024

Yet another DMA form factor… Proper use of the IOMMU remains the primary mitigation.

000

Reposted by Jasper van Woudenberg

Ken Shirriff @righto.com · 06/12/2024

Intel launched the Pentium processor in 1993. Unfortunately, dividing sometimes gave a slightly wrong answer, the famous FDIV bug. Replacing the faulty chips cost Intel $475 million. I reverse-engineered the circuitry and can explain the bug. 1/9

A die photo of the Pentium processor with the main functional blocks labeled including the caches, instruction fetch and decode, integer execution, and floating point. The image consists of complex patterns of rectangular regions in reddish and brownish colors. The image zooms in on a small part of the floating point unit giving a detail of an adder and PLA circuit.

16708236