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The next step in my playing with chroot escapes is crafting some shellcode. Recently my main dev machine is a MacBook running OS X, so it felt reasonable to fiddle with making system calls of that platform.

By 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. Usually, these are wrapped by C functions in the standard library.

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The system calls

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First, we need to know what system call we want to make, and what arguments it pretends.

A full list is hosted by Apple here. The header also hints at the fact that they are inherited from BSD. Yeah, that makes sense.

So, to write our proverbial Hello world we will pick the syscall 4

32-bit

Let’s start easy. A cute 32-bit program, written in NASM assembler language. Compile with nasm or yasm, output format MachO, and link with ld.

I’m on a Intel machine, so what we are looking for is the x86 syscall calling conventions for the OS X or BSD platform. They are pretty simple:

• arguments passed on the stack, pushed right-to-left
• stack 16-bytes aligned
• syscall number in the eax register
• call by interrupt 0x80

So what we have to do to print a “Hello world” is:

• push the length of the string (int) to the stack
• push a pointer to the string to the stack
• push the stdout file descriptor (1) to the stack
• align the stack by moving the stack pointer 4 more bytes (16 - 4 * 3)
• set the eax register to the write syscall number (4)
• interrupt 0x80

64-bit

64-bit is a bit cleaner, but completely different: OS X (and GNU/Linux and everyone except Windows) on 64 architectures adopt the System V AMD64 ABI reference. Jump to section A.2.1 for the syscall calling convention.

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• arguments are passed on the registers rdi, rsi, rdx, r10, r8 and r9
• syscall number in the rax register
• the call is done via the syscall instruction
• what OS X contributes to the mix is that you have to add 0x20000000 to the syscall number (still have to figure out why)

So, here is the (IMHO) much more clean 64-bit “Hello world”. Ah, if you want to do this at home and have it actually run, generate a macho64 object with a new version of NASM or with YASM, and link with ld as usual.

Is it real to run Call of Duty: Warzone on Mac OS?

Our answer is “yes”! Not long ago, it was impossible to imagine the full gaming experience on Mac OS. Now it’s not a big problem! There is a great amount of ways to run Windows games on this platform. You can easily play Witcher 3, Counter Strike GO, Dota 2, Call of Duty: Warzone, APEX, Mount & Blade II Bannerlord, GTA V and other top games on your favorite platform. In this article you can find the way that suits you and that will respond to your needs. After reading it you will definitely find the best way to play Call of Duty: Warzone on Mac OS!

Article’s Guide

Play Call of Duty: Warzone on a Mac with Parallels

Parallels is the virtualization software that allows you to run Windows and Call of Duty: Warzone on Mac OS with the help of virtualization. This program can be outlined for DirectX 11 support using Apple Metal. The meaning of it is that your Mac can render 3D graphics up to 15 percent faster than other programs. It will close you to the native gaming experience. Moreover, Parallels also supports new Sidecar features. This means you’ll be able to use Windows apps on an iPad when you’re using it as a second screen for your Mac, and it also includes improved Apple Pencil support. So as you can see this program has a great variety of pros. Try it now!

Play Call of Duty: Warzone on a Mac with Boot Camp

Boot Camp gives you an opportunity to run Call of Duty: Warzone on your Mac OS natively. All you need is to download Boot Camp and install Windows with the help of this application. Then you can simply launch Windows and then run any game you need. This solution is characterized by the fast performance. You will enjoy the same speed of games they’d run at on a Windows PC laptop. However, Macs’ hardware is not too good for the gaming, that’s why you are unlikely to play new AAA projects with the help of Boot Camp. Moreover, it requires a lot of disk space. So now it’s your turn to take a decision. If you are still not sure, we have one more solution for you!

Play Call of Duty: Warzone on a Mac with GeForce Now

GeForce Now is one of the best solutions to run Call of Duty: Warzone on Mac OS. All you need is to purchase the subscription and already made gaming library. Technically, you rent a very powerful computer, which streams the gameplay right for you. Don’t be afraid of stutters and freezes – the hardware of these computers will perform any game with ultra settings. However, you need good internet speed to enjoy the gameplay. Still, if this solution doesn’t respond to your needs, try the next one!

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FINAL WORDS: however, there are not all possible solutions to play Call of Duty: Warzone on Mac OS, but they are the best ones. GeForce Now can give you the best experience, but it requires a fast internet connection. Boot Camp is also OK, but it requires a lot of free disk space and its performance can vary. Parallels can be the best choice too, but it also depends on Mac’s hardware. If you have other opinion on this point or want to tell us about the really best way to play Windows PC games on a Mac, comment below! Thanks for your attention!

See also How to Play Windows PC Games on a Mac

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