So, to write our proverbial Hello world we will pick the syscall 4 4 AUE_NULL ALL The header also hints at the fact that they are inherited from BSD. The system callsįirst, we need to know what system call we want to make, and what arguments it pretends.Ī full list is hosted by Apple here. Usually, these are wrapped by C functions in the standard library. Recently my main dev machine is a MacBook running OS X, so it felt reasonable to fiddle with making system calls of that platform.īy the way, a system call is a function of the kernel invoked by a userspace program and it can be something like writing to a file descriptor, or even exiting. The next step in my playing with chroot escapes is crafting some shellcode.
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