![]() ![]() It seems every beginning Cocoa programmer spends two months dealing with programs that either dump core constantly or leak memory like a sieve because they fail to understand the elegant and complicated Cocoa memory management model. When I first started teaching myself Cocoa programming, I ran into the most trouble (and sometimes still do) with memory management. With Cocoa the onus is on the programmer to both mark and sweep, but in the end you are still deferring memory management (to an extent) to the framework instead of doing it truly manually. In my defense, I do not believe that garbage collection by its definition needs to be automatic. Note3: I fixed those errors a while back but apparently my definition of "garbage collection" strays a bit from the norm. I will be fixing them throughout the week. Note2: The kind folks in -c have pointed out several errors/misconceptions in this writeup. I will refer only to Cocoa to save my precious fingers every example here should build verbatim with the GNUStep API (though I can not personally test it to make sure. Additionally, the availability of iOS-specific source code will likely make it possible for security researchers to discover new bugs and vulnerabilities, which have been often exploited to create programs to jailbreak iOS and make it possible to download and install non-signed applications, extensions, and themes.Note: The Cocoa API exists in an open-source form known as GNUStep. According to one of the developers involved in the project, “the iOS-specific code will be quite helpful in speeding up bug elimination and the development of the virtual graphics hardware that can get us past a basic graphical framebuffer”. ![]() Actually, there have already been efforts to create a QEMU-based iOS emulator and it seems they have recently been revived. Still, building the iOS kernel could be helpful when creating an iOS emulator. In particular, the README file mentions iOS and the Makefile includes arm/arm64 options.Īs to what this could be useful for, being able to build the iOS kernel will not mean it will be possible to install it on a real device, since its bootrom only allows to run signed kernels. ![]() ![]() In this regard, it seems that the release might not fully support arm64 or Apple latest A11 SoC, but the new files released should make it possible to compile Darwin for ARM. This led to some confusion on whether the iOS kernel source code was or was not newly released and whether it is complete or not. While this may not be interesting to all developers, it still enables interesting possibilities for security researchers and others.ĭarwin is the codename of the kernel which provides the foundations of iOS and macOS, which Apple originally open-sourced on its website in 2000. Apple has quietly made available arm and arm64-specific files on its GitHub XNU-darwin repository. ![]()
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