universal-otherapp

Otherapp payload compatible with system versions 1.0 to 11.14 (all regions, all models) that leverages full exploit chains to ultimately execute a payload from the SD card.

Usage

This depends on the exploit. The recommended exploit for system versions 1.0 to 11.3 is soundhax, in which case you just have to put otherapp.bin onto the root of your SD card.

Technical details

We leverage a kernel exploit to alter L1 translation tables entries that were never previously accessed, then run kernelhaxcode_3ds which does the rest of the job.

Below system version 9.3: we use memchunkhax1
9.3 and above: we exploit sm then leverage this to exploit spi. SPI sysmodule has access to GPUPROT, subsequently allowing us to GPU DMA over the kernel memory
Full writeup coming around Christmas
spi vulnerability has been documented on 3dbrew for years
sm vulnerability is an unreported 0day, however I have fixed the bug in Luma3DS's reimpl back in 2017. I believe this is fine to release it now, as the 3DS is EoL and people can use seedminer on latest system version anyway
safehax or agbhax used depending on version

Testing with Luma3DS

Need to disable firmlaunch patches & build without custom sm sysmodule if using Luma3DS.

Credits

@zoogie: testing and debugging on exotic firmware versions
@fincs: exploitation ideas, etc.
@aliaspider: memchunkhax code