fundamentals of information systems security 3rd edition

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20145306 "Information Security system Design Fundamentals" 14th Week Study Summary

20145306 "Fundamentals of Information Security system Design" 14th Week study summary textbook Learning content Summary physical and virtual addressingPhysical addressing: The main memory of a computer system is organized into an array of cells consisting of m contiguous byte sizes. Each byte has a unique physical address of Pa. The address of the first byte is 0

2018-2019-1 20165316 "Information Security system Design Fundamentals" Second week study summary

2018-2019-1 20165316 "Information Security system Design Fundamentals" the second week to summarize the learning contents of the teaching materials Small end, low address to low, high address to high; You can determine the size and end type of a machine by forcibly extracting a byte of storage from either the cast or union. A logical operation has on

2018-2019-1 20165228 "Information Security system Design Fundamentals" Second week study summary

Floating-point arithmeticIEEE floating point representation: v= ( -1) s x M x 2E (sign S, Mantissa M, order E)Round to even (default): Rounds a number up or down, and the least significant number of results is even. Can be used in binary decimals.Rounds to 0: rounds the integer down, and the negative number rounds up.Round down: Both positive and negative numbers are rounded down.Round up: Both positive and negative numbers are rounded up.Code hosting other (sentiment, thinking, etc., opti

20145205 "Information Security system Design Fundamentals" 14th Week Study Summary

specified as a double word, the size of the block is the integer multiple of the double word, not the rounding to Yes.Explicit idle linked list Difference(1)分配时间 隐式的,分配时间是块总数的线性时间 但是显式的,是空闲块数量的线性时间。(2)链表形式 隐式——隐式空闲链表 显式——双向链表,有前驱和后继,比头部脚部好使 Sorting policy:?后进先出?按照地址顺序维护Detached List of idle links Separating storage is a popular way to reduce allocation time. The general idea is to divide all possible block sizes into equivalent class/size classes The allocator maintains an a

20145207 "Information Security system Design Fundamentals" 14th Week Study Summary

exception. The typical errors are:scanf("%d",val); (2) Read uninitialized memory Although the bass memory location is always initialized to 0 by the loader, it is not the case for heap storage. A common mistake is to assume that the heap memory is initialized to 0. (3) Allow stack buffer overflow If a program writes to the target buffer in the stack without checking the size of the input string, the program will have a buffer overflow error. (4) Assume t

Information Security system Design Fundamentals Third Week study summary-Lu Songhon

)That is, the number is rounded up or down, and the lowest valid number of the result is even.Can be used in binary decimals.2. Rounding to 0That is, rounding down integers and negative numbers rounded up.3. Rounding DownBoth positive and negative numbers are rounded down.4. Rounding upBoth positive and negative numbers are rounded up.Iv. floating-point arithmetic 1. floating-point addition Floating-point addition is exchangeable Floating point addition not binding The floating-

2018-2019 20165235 "Fundamentals of Information Security system Design" Third week study summary

summary of the wrong quiz Wrong question 1 and reason, understand the situation Wrong question 2 and reason, understand the situation ... Other (sentiment, thinking, etc., optional)XxxXxxLearning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 5000 rows 30 Articles 400 hours First week 200/200 2/

20145321 "Information Security system Design Fundamentals" 7th Week Study Summary

20145321 "The basis of information security system Design" 7th Week study summary textbook study content summary sixth chapterA memory system is a hierarchical structure of storage devices with different capacities, costs, and access times.6.1 Storage TechnologyThree common storage technologies: ram/rom/disk(1) Random access memory RAM There are two categories: Static RAM (SRAM) and dynamic RAM (DR

Information security system Design Fundamentals Fifth Week study summary------20135334 Zhao Yanglin

that there are already compiled. yo files that can be viewed with vimThe code in Figure 4-7 of the No. 239 page of the textbook, called Asum.yo in the system, prints its contents on the screen:It can be seen that the results are consistent with the 240 pages of the textbook.Textbook page No. 251 of Figure 4-17, I first used to build a 417.ys enter after entering:Then compile with make 417.yo and use Vim to enter 417.yo after compiling.Reference, I saw Shang she summed up than I have more organi

20145234 Huangfei "Fundamentals of Information Security system design" GDB debug assembler Stack Process analysis (1)

Tags: alt padding command ble language jump Edit RDA SystemStack traceFirst edit a program Compile with GCC, then debug with GDB and find GDB has not been downloaded Re-run gdb after download Set Breakpoint: B + line number or "main" Run: R Frame: The printed information: the stack's layer number, the current function name, the function parameter value, the file and line number where the function is located, and the statement to which the functio

Information Security system Design Fundamentals third Week study summary

, and n = 23 bits respectively, resulting in a 32-bit representation;In a double, the S, exp, and Frac fields are 1 bits, k = 11 bits, and n = 52 bits, respectively, and a 64-bit representation is obtained.Problems in Learning:(1) about overflow:Due to the inherent flaw of C/D + + language, neither checking the array boundary nor checking type reliability, and the program developed in C + + language because the target code is very close to the machine core, so it can directly access the memory a

20145225 "Information Security system Design Fundamentals" 7th Week Study Summary

misses/number of references Hit Ratio = 1-No hit Hit time No hit penalty: Because of the extra time required to miss the 2. Specific impact: Cache Size: Hit ratio +, hit Time + Block Size: Spatial locality +, hit ratio +, number of cache rows-, time locality-, no hit penalty + Degree of coupling: E value big, jitter-, Price +, hit Time +, no hit penalty +, control logic + "compromise for not hit penalty low, low degree of coupling, not hit penalty high, use hig

20145225 "Fundamentals of Information Security system design" a familiar environment for experimental development

solutionissue: After you open HyperTerminal, The information on the arm machine is never displayed in the HyperTerminal window. solution: Found the reason, is the serial cable connected to the wrong location, should not be connected to 1, after replacing 0 , HyperTerminal will show normal. (2)IP problems and Solutionsproblem: Need to put the lab box, virtual machine the IP of Redhat,WinXP is set to the same network segment. FIX: First look at the lab

Information Security system Design Fundamentals third Week study summary

expressed in the desired floating-point form.1. Rounding to even numbersRounds a number up or down so that the lowest effective number of the result is even.2. Rounding to 03. Rounding up4. Rounding Down34 you can see the upper bound.Rounding to even gets the closest match.4. Floating-point arithmeticFloating-point addition: exchangeable, non-associative, satisfying monotonicityFloating-point multiplication: exchangeable, non-associative, non-assignable, satisfies the following monotonicityFloa

20145339 "Information Security system Design Fundamentals" 7th Week Study Summary

that divides the cache into chunks, transfers blocks between different tiers, determines whether they are hit or miss, and processes themCache memoryGeneral-Purpose Cache Memory Architecture:Each memory address has a M-bit, which forms m=2^m different address cache groups: Array cache lines for S=2^s cache groups: b=2^b bytes of data blocks make up a valid bit: Indicates whether the row contains meaningful information marker bits: Uniquely identifies

2018-2019-1 20165330 "Information Security system Design Fundamentals" Fourth Week study summary

non-gate or non-gate HCL integer Expression Case Expression Format: [ select 1: expr 1 select 2: expr 2 . select k: expr k ] Set Relationship:iexp in{ iexp1,iexp2,...iexpk } Arithmetic/logic unit (ALU) Sequential implementation of Y86-64 Organize the processing into stages Value fetch--> decoding decode--> performing execute--> memory--> writeback write back write back--> update PC update SEQ

20145235 "Information Security system Design Fundamentals" 14th Week Study Summary

/12 20/200 Learn the contents of system level I/O and understand the intrinsic function Tenth Week 407/1035 1/13 30/230 Analyze and debug your code, system-level I/O content 11th Week 714/1749 2/15 40/270 Understanding anomalies and their types 12th Week 0/1749 4/19 30/300 Review the contents of the previous weeks 13th Week 797/2728 2/21 20/320 Learn t

20145234 Huangfei "Information Security system Design Fundamentals" 12th Week Study Summary (ii)

handler is called, the new signal screen word created by the system automatically includes the signal being delivered. This ensures that when a given signal is processed, if the signal occurs again, it will be blocked until the end of the processing of the previous signal; The response function is set to be valid and not resetThe implementation of sleep () should be divided into three steps: Register a signal signal (sigalrm,handler). Call the alarm () function. Pause () suspen

20145309 Information Security system Design Fundamentals 7th Week study Summary

status code stat from the result of the instruction execution, based on Icode,imem_error,instr_valid,dmem_error. update pc stage generates a new value for the program counter, depending on the type of instruction and whether to select the branch, the new PC may be valc, Valm, or Valp. Please explain why there is only one if statement in the C language code, and the assembly code contains two conditional branches?A: The first conditional branch is part of th

2018-2019-1 20165302 "Information Security system Design Fundamentals" Third Week study summary

1. Machine-Level Code(1) Two kinds of abstract Defines the format and behavior of machine-level programs by ISA The memory address used by the machine-level program is the virtual address 2. Data format3. Operand designator4. Press in and eject stack data Follow the principle of first in and out Push Press in, pop delete Pushq press four words into the stack popq four words pop-up stack 5. Arithmetic and logical operations LEAQ Load Valid address INC plus a D

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