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3E74

Posts: 2559
Location: feels wrong

Posted: Sat, 21st Nov 2015 18:56 Post subject: Hacking GCN via OpenGL

Using an Translater here so dont mind the strange english Smile

It occurs not frequently that one finds on the Internet a hacking talk, actually entering uncharted territory. And not just "oh look, once you have ownt a system, you can do these terrible things ". Therefore I am delighted today to present you this slide. If you have a graphics card with OpenGL or programm openGL, then it writes the shader in a programming language called GLSL, and the driver translated then hardware-specific binary code and loads it on the graphics card. Real hackers would of course like to understand this binary code and see whether you can make exciting things on graphic cards in the binary code. Turns out that OpenGL has an API for it to read the compiled byte code and upload. Which is intended for the caching, because compiling from GLSL takes time, and it seeks if possible after an ALT-tab or to save. This type has now played around with this API, and noted that a boxed ELF binary falls out and that there is a disassembler, and then he is seated and hacked an assembler for it.

Quote:

Hacking GCN via
OpenGL
Tomasz Stachowiak
@h3r2tic

otivation
•
Want full control over shader code on PC
•
Ability to feed HW-speciic ISA
•
Vulkan/DX bytecode not enough
•
Opens up interesting possibilities
•
Self-modifying shaders
•
Shader specialization on GPU
•
Shader sub-routines

.......................................

More here:

source:
https://blog.fefe.de/?ts=a8aebdbe

And the Slides (more info):
https://onedrive.live.com/view.aspx?resid=EBE7DEDA70D06DA0!107&app=PowerPoint&authkey=!AD-O3oq3Ung7pzk

if one doesnt like onedrive, i upped it also on Zippyshare:
http://www40.zippyshare.com/v/yNr6zqUx/file.html

An interessting read for shure...

Smile

[/quote]

..:: Life - A sexually transmitted disease which always ends in death. There is currently no known cure::.. Troll Dad

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