PPT-Kernel Stack Desirable for security:

eg illegal parameters might be supplied Whats on the kernel stack Upon entering kernelmode tasks registers are saved on kernel stack eg address of tasks usermode stack. Debugging as Engineering. Much of your time in this course will be spent debugging. In industry, 50% of software dev is debugging. Even more for kernel development. How do you reduce time spent debugging?. Motivation. Operating systems (and application programs) often need to be able to handle multiple things happening at the same time. Process execution, interrupts, background tasks, system maintenance . Mode, space, and context: the basics. Jeff Chase. Duke University. 64 bytes: 3 ways. p + 0x0. 0x1f. 0x0. 0x1f. 0x1f. 0x0. char p[]. char *p. int p[]. int* p. p. char* p[]. char** p. Pointers (addresses) are 8 bytes on a 64-bit machine.. : A scalable Unified tracer . from kernel to user space. Junghwan . Rhee. , Hui Zhang, Nipun . Arora, . Guofei Jiang, Kenji Yoshihira. NEC Laboratories America. www.nec-labs.com. Motivation. IT software faces diverse functional and non-functional issues due to complexity of software and usage of underlying components.. Debugging as Engineering. Much of your time in this course will be spent debugging. In industry, 50% of software dev is debugging. Even more for kernel development. How do you reduce time spent debugging?. Fast Dynamic Binary Translation for the Kernel. Piyus. . Kedia. and . Sorav. . Bansal. (SOSP 2013). Presenter: Apoorva Garg. Outline. Paper Presentation. Background. DBT Architecture. DBT Optimizations. 2/2/17. Context Switches. Context Switching. A context switch between two user-level threads does not involve the kernel. In fact, the kernel isn’t even aware of the existence of the threads!. The user-level code must save/restore register state, swap stack pointers, etc.. The Structure of the Operating System. Noah Mendelsohn. Tufts University. Email: . noah@cs.tufts.edu. Web: . http://www.cs.tufts.edu/~noah. Based on a presentation by Professor Alva Couch. COMP 111: Operating Systems (Fall 2013). Process concept. A process is an OS abstraction for executing a program with limited privileges. Dual-mode operation: user vs. kernel. Kernel-mode: execute with complete privileges. User-mode: execute with fewer privileges. Introduction to Operating Systems CPSC/ECE 3220 Fall 2019 Lecture Notes OSPP Chapter 2 – Part B (adapted by Mark Smotherman from Tom Anderson’s slides on OSPP web site) Types of Alerts to Kernel What is CUDA?. Data Parallelism. Host-Device model. Thread execution. Matrix-multiplication . GPU revised!. What is CUDA?. C. ompute . D. evice . U. nified . A. rchitecture. Programming interface to GPU. CS 161: Lecture 3. 2/1/2021. Multitasking. A user-level execution context consists of:. A virtual address space (pointed to by . %cr3. ). The next instruction to execute (pointed to by . %rip. ). A stack (pointed to by . Jos . Wetzels. , Ali . Abbasi. Infiltrate, Miami, 2018. Who are we?. Jos . Wetzels. Ali . Abbasi. Independent Security Researcher @ . Midnight Blue. (Previously) Security Researcher @ . UTwente. This work part of MSc thesis @ . Doowon. Kim*, Michelle . Mazurek. *, Christian . Stransky. You. . Get. . Where. . You‘re. . Looking. . For. The Impact . of. Information . Sources. on Code Security. Cispa. , Saarland University; *University .