11–20 of 23 posts
I mean they're very clever and legit and kudos to the people who develop these exploits, but they're not ELF.
301 bytes! The base64 one-liner install is a nice flex. Accepting an infinite loop when energy_full doesn't exist is peak code golf, perfectly reasonable when every byte counts. Is there a writeup on the assembly somewhere?
As always with these admirable hacks, I feel compelled to point out these are not really ELF executables but just small files you can trick the x86_64 Linux kernel into loading. I mean they're very clever and legit and kudos to the people who develop these exploits, but they're not ELF.
As always with these admirable hacks, I feel compelled to point out these are not really ELF executables but just small files you can trick the x86_64 Linux kernel into loading. I mean they're very clever and legit and kudos to the people who develop these exploits, but they're not ELF.
Is it really not ELF? The file starts with the \x7FELF magic, but I'm not by my laptop to see what `file btry` outputs.
$ git clone https://github.com/meribold/btry
...
$ make
as -mx86-used-note=no btry.s -o btry.o
objcopy -O binary btry.o btry
chmod +x btry
$ ./btry
Segmentation fault ./btry
$ strace -f ./btry
execve("./btry", ["./btry"], 0x7ffc1a562078 /* 57 vars */) = -1 ENOMEM (Cannot allocate memory)
$ file btry
btry: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, corrupted section header sizeDell 5440 $ git clone https://github.com/meribold/btry ... $ make as -mx86-used-note=no btry.s -o btry.o objcopy -O binary btry.o btry chmod +x btry $ ./btry Segmentation fault ./btry $ strace -f ./btry execve("./btry", ["./btry"], 0x7ffc1a562078 /* 57 vars */) = -1 ENOMEM (Cannot allocate memory) $ file btry btry: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, corrupted section header size
As always with these admirable hacks, I feel compelled to point out these are not really ELF executables but just small files you can trick the x86_64 Linux kernel into loading. I mean they're very clever and legit and kudos to the people who develop these exploits, but they're not ELF.
Or to flip it round. If Linux accepts something as an ELF that isn't, then it isn't an ELF loader.
Would you describe a web browser that doesn't score 100% on a rendering test as not a browser?
I wrote a very quick hacky program for X11 that stays always visible that will display the information for any number of batteries: https://gitlab.com/danbarry16/bat_mon
It ends up being 50kB with minimal optimization and sports a lightweight X11 library (GUI) and JSON parser (configuration).