In creating OS X, Apple has completely re-engineered the Mac OS core operating system. Forming the foundation of OS X is the kernel. Figure 3-1 illustrates the OS X architecture.Figure 3-1 OS X architecture The
We argue that the challenge of future multicore hardware is best met by embracing the networked nature of the machine, rethinking OS architecture using ideas from distributed systems. We investigate a new OS structure, the multikernel, that treats the machine as a network of i...
You might also note that sometimes the kernel uses conventional types, such asunsigned int, for items whose dimension is architecture independent. This is usually done for backward compatibility. Whenu32and friends were introduced in Version 1.1.67, the developers couldn’t change existing data stru...
maks_ack_irq 不但将 irq_desc 的状态设置为 mask ,同时还调用了 chip->mask_ack 来设置硬件的 mask , 并向硬件发送 ACK 。 对于多核 CPU 所潜在的竞争冒险1,可以通过检测 irq_desc 的状态来避免 —— 一旦检测到 irq_desc->status 中包含了 IRQ_INPROGRESS , 则表明该 irq 正在被处理,直接退出即可。
Basic computer architecture Preferred Qualifications BS/MS in Computer Science or equivalent knowledge and experience iOS or macOS exposure Familiarity with software security principles Proficiency with ARM assembly language Additional Requirements Apple’s most important resource, our soul, is our people. Ap...
2016: "Using Undocumented CPU Behavior to See Into Kernel Mode and Break KASLR in the Process" at Black Hat [video]2016: "Breaking KASLR with Intel TSX" Yeongjin Jang, Sangho Lee and Taesoo Kim at Black Hat [slides] [video]2016: "Breaking KASLR with micro architecture" by Anders Fogh [...
In this paper, we introduce RiskiM, a new hardware-based monitoring platform to ensure kernel integrity from outside the host system. To deliver the inner state of the host to RiskiM, we have devised a hardware interface architecture, called PEMI. Through PEMI, RiskiM is supplied with all...
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architecture. Understanding Apple’s operating systems will allow you to write efficient device drivers, such as those covered in the book, using I/O Kit.With OS X and iOS Kernel Programming, you’ll:Discover classical kernel architecture topics such as memory management and thread synchronization...
non-executable stacks usingreturn-to-libcand other techniques). This lack of a PTE no-execute flag illustrates a broader fact: permission flags in a VMA may or may not translate cleanly into hardware protection. The kernel does what it can, but ultimately the architecture limits what is ...