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userlandexec
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userland exec for Linux x86_64
Download README (.md)
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Download README
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README.md
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userlandexec
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# userlandexec ## userland exec for Linux x86_64 This code emulates an `exec()` system call. That is, it reads an ELF format file, and loads it into memory at the correct address. It then starts the newly-loaded executable to running. All this is usually done by the Linux kernel, so some bizarre things go on. For starters, the userland exec unmaps the currently-executing ELF file, so as to be able to put the new ELF file's contents in the right place in memory. This code works with 64-bit Linux ELF files, compiled with GCC and linked against glibc. Other C runtimes (Musl libc, for example) cause errors mysterious to me. ### Building Run `make` - that should compile `example` and `ulexec.so`. Once you've done that, you can try it out: `./example ./ulexec.so /usr/bin/cat /proc/self/maps` ### Fun `./example ./ulexec.so `./example ./ulexec.so `./example ./ulexec.so /usr/bin/cat /proc/self/maps` Yes! You can have it overlay itself with another copy of itself.
