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Questions tagged [xnu]

xnu is the name of the operating system kernel that underpins Mac OS X/darwin and iOS.

xnu is the name of the operating system kernel that underpins Darwin, which in turn is the core of Apple's macOS (formerly OS X and Mac OS X), iOS/iPadOS (formerly iPhoneOS), tvOS, and watchOS operating systems. It has its origins in the NeXTStep operating system, and is a combination of parts of the Mach kernel (mainly the virtual memory subsystem and inter-process communication via Mach "ports"), the 4.3BSD kernel (networking, process management, POSIX compatibility, VFS/file system layer) and a device driver subsystem called the I/O Kit, which was developed in C++ specifically for the xnu kernel.

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How to boot XNU kernel?

I have compiled XNU 3789.31.2 from source successfully but don't know how to boot it and get it run. Is there any detailed instruction for that?
Breeza
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catch SIGKILL in MacOS driver

I'm currently debugging my daemon that supposedly die due to SIGKILL. I'd like to catch that signal that is intended for my process and add a printout that this process got . I'm aware that SIGKILL cannot be caught in process level signal handler,…
user7256215
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setjmp/longjmp in XNU/Darwin Kernel

I need longjmp/setjmp in a .kext file for OS X. Unfortunately, I don't think there's any official support for these functions in XNU. Is there any fundamental reason why this cannot work or is it just not implemented right now? Any ideas how I could…
Johannes Weiss
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Change vm page protection attributes from XNU kernel driver

As a part of an experiment i need to make a read-only page writable in kernel address space from a non-IOKit kext. In user mode i can do vm_protect, but there is surprisingly little info on how this can be done in kernel mode (or i am completely…
Inso Reiges
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How to get cpu usage in the mach kernel?

I try get cpu usages in mach kernel but i always get the same output. What i do wrong? static mach_port_t port; Get cpu load statistics int load_get(host_info_t r_load) { mach_msg_type_number_t count; count = HOST_CPU_LOAD_INFO_COUNT; …
Kfur
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load kernel extension through C API?

Is it possible to load a kernel extension (kext) through a C API instead of using the system() call?
mrdvlpr
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Virtual SCSI disk device driver on OS X causes panics on when device formatted using HFS+ only

I’m currently developing a virtual SCSI device driver using IOKit. My driver loads fine and I’m able to format my device using ExFat, FAT32 or HFS+. I am also able to copy files to and from my virtual device using a CLI with any of these file…
user3814483
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Osx kernel crash inside ctl_enqueuedata

My code is using ctl_enqueuedata for kernel-user communication. I notice that SOMETIMES (I cannot really reproduce it) - I got crash inside of ctl_enqueuedata When I connect using debugger, the backtrace is the following frame #0: 0xffffff80248bcecb…
Georgy Buranov
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XNU incudes in Kext

I'm working on Kext which should have access to struct proc->p_pid field. The problem is the structure is defined in XNU sources only, so I faced incomplete definition of type 'struct proc' error during compilation. From my point of view, to include…
Alexander Stavonin
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Mac OS X: recvmsg returns EMSGSIZE when sending fd's via Unix domain datagram socket

I have a piece of code that uses Unix domain sockets and sendmsg/recvmsg to send fd's between two processes. This code needs to run on both Linux and Mac (it is complied separately for both platforms). I'm using SOCK_DGRAM (datagram) sockets. I send…
Mayank
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How to determine if process has root privileges in a network kernel extension?

I'm writing a socket filter kext and I would want to ignore any connections made as root. Before OS X Lion, the following code worked flawlessly: static boolean_t is_root() { proc_t p = proc_self(); boolean_t isRoot = proc_suser(p); …
jjs
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Where is vnode_t defined?

I'm trying to use a vnode_t which is defined as struct vnode *. I can find plenty of references to struct vnode but I cannot find the header in which is defined. Can anyone help?
Joe
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On AArch64, how does SCTLR_EL1.SPAN=0 work when a translation fault occurs while PSTATE.PAN=1?

For example, the XNU kernel has the copyin()/copyout() functions to copy data from user-space to kernel-space and vice versa. Since these functions need to access user-space, they disable PAN by setting PSTATE.PAN to 0. However, if SCTLR_EL1.SPAN is…
Félix Poulin-Bélanger
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How to use `proc_pid_rusage` result in Swift using UnsafeMutablePointer?

I tried this code to get result from proc_pid_rusage: import Foundation let p1 = UnsafeMutablePointer.allocate(capacity: 1) let spid = ProcessInfo.processInfo.processIdentifier let status = proc_pid_rusage(spid, 0, p1) if status ==…
egor10_4
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How to properly include C header file in macOS Swift Xcode project for `proc_selfpid` function?

I have a simple project with code: import Foundation let p1 = UnsafeMutablePointer.allocate(capacity: 1) let spid = proc_selfpid() let s = proc_pid_rusage(579, 0, p1) if s == KERN_SUCCESS { // ... } print("Status…
egor10_4
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