Jachash

doing memes.

(Yuval Hanoch Hirschenbein Sadde)

[Jachash @jachashx]

@0xDACA @sysc4lls Hahaha you know best

[Jachash @jachashx]

The 40-year-old iOS kernel bug I discovered on the DEFCON 34 main stage.

My demo crashed on stage, and after investigating I traced it to a mistyped ++ that goes back to 1985.

Can you spot the bug?

Full post:

https://t.co/e3vuomAJ8r

[Jachash @jachashx]

The Mach 2.5 + 4.4BSD line refers to Rhapsody, the predecessor of OS X. It combined NeXTSTEP's Mach-derived kernel and 4.3BSD-derived Unix layer, with the BSD layer later refreshed from 4.4BSD sources. The article traces the lineage backward, so it discusses the 4.4BSD descendants before returning to 4.3BSD.

https://t.co/9lzvhwYNVP

[Jachash @jachashx]

@s0crat1c_1 @gh0sth4ck3d Could be cool to measure how much of 4.3BSD-Tahoe’s code (the 1988 release) is still present on modern iPhones.

[Jachash @jachashx]

@s0crat1c_1 @gh0sth4ck3d The history of iOS spans so far into history, to NeXTSTEP from the 90s and BSD in the 80s. Some pieces of the OS are still untouched from that era. The full blog post goes back into the past.

[Jachash @jachashx]

@hacefresko Haha thank you! Glad you enjoyed it.

[Jachash @jachashx]

@HenkPoley Haha nice. I think the BSD-derived heap issue Claude pointed out never was part of the Apple history arch of BSD (as in XNU). Going back their history, it never changed that way. Maybe a later BSD-proper revision.

[Jachash @jachashx]

@ferrqmucwpwdf what do you mean?

[Jachash @jachashx]

@LunacySoft Thanks!!

[Jachash @jachashx]

@Acelogic_ Thank you!!

[Jachash @jachashx]

@dendisuhubdy Thank you!

[Jachash @jachashx]

@MrCreator1 Yep!

[Jachash @jachashx]

@Themariocrafter Hahaha yeah, I trace down the snippet to the exact date in 4.3BSD in the blog post.

[Jachash @jachashx]

@OzTamir Whiskey?? mae

[Jachash @jachashx]

@AmirZakHeb Bet

[Jachash @jachashx]

@HilaShmuel Hiiii!!