Since it is Private exported, can't use it directly.

I get this error when loading kext. "Authenticating extension failed: Bad code signature." The MacBook system status is as follows. There are a few points to illustrate. This kext file works fine with SIP turned off in MacBook 2018 (MacOS 10.14.6). This kext will not be released, it will only be used for debugging within our own group. This kext has been compiled into the arm64 version. The SIP option has been turned off in recovery mode and the option to reduce security has been checked for kext testing. I want to use this kext (and not distribute) if I have to use the Apple Developer program for authentication and signing and authentication. What should I do if I don't need to? Or is it not caused by certified signatures?

How to sign and notarize a kext? Any body could help me to finish it? I already wrote a apply to enable my develop account kext sign ability,but i dose not recieve any response. Help!

We have noticed that in our application that creates worker threads for audio processing, these threads (time-constrained priority) in some cases do not run on the P-Cores (on Apple Silicon Macs). It was my understanding that once we use audio workgroups, the scheduler will always schedule our threads on the P-Cores. This works okay as long as the CoreAudio buffer size used is 256 samples or less (@ 48K). But if the buffer size is 512 or above, the threads are run on E-Cores (checked using System Trace). Is this expected behavior? Can I find any documentation for this (short of analyzing the scheduler source in kernel)? Thanks. Devendra.

Hi, I am using the below code to compute the free memory in iOS. uint64_t memAvailable() { mach_port_t host_port = mach_host_self(); if(host_port == MACH_PORT_NULL) { return 0; } vm_size_t pagesize; host_page_size(host_port, &pagesize); vm_statistics_data_t vm_stat; mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t); if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) { tdlog(LOG_LEVEL_DEBUG, @"Failed to fetch vm statistics"); return 0; } /* Stats in bytes */ return vm_stat.free_count * pagesize; } My qs is do we need to call mach_port_deallocate() to release the reference count on host_port?? Please advise.

Apple platforms have APIs, inherited from Mach, that return low-level memory statistics [1]. Some third-party tools report those statistics as if they were relevant to app developers. In most cases they are not. Specifically, any report on the amount of free memory is unlikely to be useful. This number is the size of the kernel’s free memory pool. Most VM-based OSes attempt to keep a certain amount of free memory available to avoid running out of memory in critical circumstances (for example, when trying to allocate memory on the page out path). But the size of that pool has very little to do with the amount of memory pressure on the system. Remember that the kernel’s goal is to keep the pool at a certain size, so it lets memory go to ‘waste’ until critical thresholds are crossed, as which point it starts cleaning up. As a concrete example of this, consider an iPhone running Safari. When you press the Home button, you return to the home screen but the system leaves Safari loaded in memory. At this point the free memory is X, where X is slightly higher than the threshold where the system would remove Safari from memory. Now apply some memory pressure to the system. It responds by removing Safari from memory, whereupon the free memory jumps up to Y, where Y is much larger than X. So putting memory pressure on the system has resulted in a larger free memory value. If you were using this free memory value as a proxy for memory pressure, you’d end up drawing exactly the wrong conclusion. Apple platforms have various standard techniques for handling memory pressure — memory warnings, NSCache, purgeable memory, DISPATCH_SOURCE_TYPE_MEMORYPRESSURE, and so on — and you should use those techniques rather than any sort of free memory value. Finally: If you want to get a summary of how much memory your app is using, you should look at its footprint. If you’re building an automated test suite, you can get this value programmatically. See this post for details. If you want to find out how much memory headroom you have, check out the os_proc_available_memory function. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com" [1] Specifically, the host_statistics API and the various structures defined in <mach/vm_statistics.h>. Revision History 2023-03-03 Added a reference to os_proc_available_memory. 2021-02-27 Fixed a broken link. Made other minor editorial changes. 2019-06-27 First posted.

Hi,  I've been looking for the following Debug Kernels from the download section of this site but there are not available for download.  Is it possible to get these elsewhere? If not, what do others do when these files are not available? Debug Kit 10.12.6 Build 16G2136 Debug Kit 11.7.4 Build 20G1120 Many Thanks,

Can Apple reopen the OpenDarwin project? It's time for OpenDarwin to reappear.Now, the situation is much different than before, and instead of harming Apple's interests, reopening the OpenDarwin project could help improve the quality of Apple's operating systems.

My log: {"bug_type":"210","timestamp":"2022-01-20 19:00:59.00 +0700","os_version":"iPhone OS 15.2.1 (19C63)","incident_id":"3AB7979E-9CC4-44FF-A37B-10C4C3382C5A"} { "build" : "iPhone OS 15.2.1 (19C63)", "product" : "iPhone14,3", "kernel" : "Darwin Kernel Version 21.2.0: Sun Nov 28 20:43:39 PST 2021; root:xnu-8019.62.2~1/RELEASE_ARM64_T8110", "incident" : "3AB7979E-9CC4-44FF-A37B-10C4C3382C5A", "crashReporterKey" : "5fb1098457e4e82a638cdf4335f0309c4323ce88", "date" : "2022-01-20 19:00:59.82 +0700", "panicString" : "panic(cpu 2 caller 0xfffffff02ba9d6ac): mbuf_watchdog: 1 waiters stuck for 11 secs\n3418/3424 mbufs in use:\n\t3418 mbufs allocated to data\n\t6 mbufs allocated to caches\n760/760 mbuf 2KB clusters in use\n591/592 mbuf 4KB clusters in use\n2048/2048 mbuf 16KB clusters in use What I want to ask is, what is the condition that can trigger system rebooting?

I am creating a macOS app that will send commands to a USB device when it is plugged into a Mac. There are only two steps to accomplish this: send request commands to the USB and receive response messages from it. The USB has an attached SCSI, but I am unsure of how to send SCSI commands to macOS. Research has indicated that a kernel driver must be written for the USB to function on macOS. I have a .cpp file that can be converted into a .dll file to work on the Windows side. Is it possible to reuse this .cpp file and convert it into a .so file that can run on the macOS side? Is there someone interested in this project? I am looking to outsource it.

When "/tmp" and $TMPDIR directory are cleaned up in macOS?I know about removing files and directories in /tmp directory in boot time. Is it right?In addition, are there other times in trying to clean up the directory?

From https://support.apple.com/en-us/HT211860 said: To install a new or updated kernel extension in macOS Big Sur, you can do either one of the following: Instruct the user to follow the prompts within Security &amp; Privacy preferences to allow the extension, then restart their Mac. You can permit users who are not administrators to allow the extension using the AllowNonAdminUserApprovals key in the Kernel Extension Policy MDM payload. Send the RestartDevice MDM command and set the RebuildKernelCachekey to True. Is There a way that user dont need to click "Allow" in Security &amp; Privacy preferences ? The udpated kernel extension can be loaded after the user restart the computer?

Hi, I need to programatically compute the free and used RAM in ios using objective C. Most of the samples I have seen uses host_statistics API, although that works but that API is macOS specific and not iOS. I am looking for API which is compliant with iOS.

Although the Ventura 13.1 kernel debug kit was posted, there doesn't appear to be a kdk for macOS 12.6.2 21G320 or 11.7.2 20G1020 available in developer downloads. The Ventura 13.0 kdk is also still missing. Thanks. FB11885071

macOS 13.0 was released October 24, 2022. As of December 11th there does still not appear to be kernel debug kit available for this release, or any release (non-beta) version of Ventura. The kernel debug kits for 11.7.1 and 12.6.1 also appear to be missing. When will a kernel debug kit be available for a release version of Ventura? Thanks.

Hello We have a USB camera. My Mac can recognize it and we can get frames with any software. There is a physical button on it and the vendor says the camera is UVC-compliant. But button doesn't work anyway. I captured some USB traffic data and saw that it has two interfaces. One for streaming and other one for interrupting (like button click). I read UVC 1.5 standards to understand it and it is working like written in UVC 1.5. So, I can get a data with an interrupt transfer when clicking the button. I checked these two interfaces, they use UVCAssistant for driver(System Extension). I tried to use libusb, I can get data from button click. But for frames I had to use libuvc, but it wasn't work for my camera (I think it is related with USB descriptor parsing in libuvc). I thought that I should write a driver for single interface and so second interface will use same UVC assistant driver and first interface will use my driver. I wrote a driver and it matches with first interface. But second interface is empty (unhandled by any driver). I want to load UVCAssistant for second interface of USB port. How can I do this? Output before loading my driver After loading: IOKitPersonalities that I used:

is there any public API or Method to get resident size of current process of game like Debug Gauges to Monitor Memory?As far as i know someone use XCode instrument -&amp;gt; show the Debuger navigator -&amp;gt; Memory to get it, before i have found some API to get itfrom internet,but a big differece bettween with the result of XCode Debuger navigator .the first method like this: struct mach_task_basic_info info; mach_msg_type_number_t count = MACH_TASK_BASIC_INFO_COUNT; if (task_info(mach_task_self(), MACH_TASK_BASIC_INFO, (task_info_t)&amp;amp; info, &amp;amp;count) == KERN_SUCCESS) { int32_t _pss = (int32_t)info.resident_size / (1024 * 1024); }another method like this: task_vm_info_data_t vmInfo; mach_msg_type_number_t count = TASK_VM_INFO_COUNT; kern_return_t kernelReturn = task_info(mach_task_self(), TASK_VM_INFO, (task_info_t) &amp;amp;vmInfo, &amp;amp;count); if(kernelReturn == KERN_SUCCESS) { int32_t _pss = (int32_t) vmInfo.phys_footprint / (1024 * 1024); }someone discuss:https://github.com/aozhimin/iOS-Monitor-Platform/issues/5a big differnece bettween the result of the first method and the result of XCode Debug navigator instrument, info.resident_size will not increase When the memory is allocated continuously,but xcode Debug navigator will increase.but a little difference bettween the result of the second method and the result of XCode Debug navigator instrument when use game test,but application app will same with it. so i want to know how XCode Debug navigator to calculate Memory or how to get resident size of current process more precise,any idea will help me,thanks in advance!

Dear ALL my teamID RNHV6GLXG8. I want to request a KEXT-enabled for sign a IO kit driver .pls help me ! Alex Liu

Hi Team, I am using macos 10.15.7 catlina, Xcode installed 12.4, SDK: MacOSX11.1.sdk. Im trying to build my project but getting below error related to mac_policy.h header file. I tried to use SDK MacOSX10.12/10.5 but getting architecture not supported issue. s/ctuser/workspace/ScanNProtect/RPDriver/driver/build/RPDriver.build/Release/RPDriver.build/Objects-normal/x86_64/DriverMain.o /Users/ctuser/workspace/ScanNProtect/RPDriver/driver/Apple/src/DriverMain.c:9:10: fatal error: 'security/mac_policy.h' file not found #include &lt;security/mac_policy.h&gt; ^~~~~~~~~~~~~~~~~~~~~~~ Please suggest the Xcode/SDK version supporting for this issue.

#include &lt;sys/ucontext.h&gt; in this header defined ucontext related type and function(such as ucontext_t, getcontext, makecontext, and swapcontext). It works fine in rosetta mode, but failed on native arm, cause the swap param's address is wrong. I confirmed it by using an open source developed for iOS(https://github.com/MCApollo/libucontext-ios-arm64) support functions. Hope this bug can be fixed in future, cause a lot of unix type open source depend on it, and may cause m1 native version adapt slow.