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Say I want to combine two binaries into a single one. Is there good prior art for this?
E.g. an entry binary, which does some stuff and then opens the other binary.
Should def be possible, but it's more a question of finding the least hacky version of doing so 
But like seriously. Best I'm seeing is copying files to disk, and executing them. Big downside of this is that it leaves a bunch of artifacts, and takes time. Ideally we could just JMP into where the next file starts or smth, hah.
Okay, bit anticlimactic but the most reasonable approach seems to be to store the embedded binary as base64 string inside the wrapper program. Then extract to /tmp to set permissions and run it. Simple, and should work!
This then becomes an exercise in combining files right — because you probably want a tool that can generate these combined files for you. But that seems like a solvable problem! :D
I'll most likely be able to knock out a demo in less than a day.
Might do a fun side track on stream about this, if I can get the prerequisites working first. (E.g. working libcgroup locally; unshare and chroot are ok too ).
One bin to find them
The Linux kernel has included support for squashfs for years, so maybe the entry point binary can be “mount the fs in the data section to /tmp/app/<uuid> and execute ./bin/main of it”? (Implementation left as an exercise for the reader)
aye, yeah squashfs might just be the best option. Much easier to debug than some random tmp file, probably. This is cool!
Trailing data as has been done by self extracting zip files is the norm.
!!! Do you have any more info on this? Self-extracting zip means it's a write to disk, right?
BINARIES FOR THE BINARY CAT
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