What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

and the formulas after that are missing the n as well.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

For metrics, our throughput stays the same, and our average wait and average completion time are on par with SJF, but without needing the a priori knowledge of execution times, which was said was unfeasible in a real system.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

Additionally, lawmaking is a slow process, and the stakes are high for focussed attackers.

What needs to be fixed?
In the section "What is a system call?" the line "Examples of system calls include open, send, malloc." exists.
In the errata for those video slides, it states that she meant to use mmap (linux memory acquistion) instead of malloc (c memory acquistion).

What needs to be fixed?
https://www.omscs-notes.com/operating-systems/thread-design-considerations/#kernel-vs-user-level-threads
Paragraph 3 last sentence: "Different processes may user use entirely different user level thread libraries."

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

Compute Mean Volume Quiz Solution -
Answer you have: "df['Values'].mean()"
Answer should be: "df['Volume'].mean()"

Midterm 2

The following typo exists on this page:

The base-rate fallacy of IDS states that if the numbers of intrusions are low compared to the number of legitimate users of a system then the false alarm rate will be high unless the test is extremely discriminating

It should be uses here instead of users.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.
Timesharing and Timeslices section, following sentence:

If the task needs to be wait on an I/O operation, or synchronize with another task, the task will execute for less than its timeslice before it is placed on the appropriate queue and preempted.

Very tiny typo in the chapter. free below should be changed to busy.
"This implementation introduces a delay every time the thread notices that the lock is free."

Again, thanks for making these notes it is very helpful. I could not imagine watching 1-2 hours of videos for each lectures to review material.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

In the modern, digital context, websites and other software capture __use and distribute our information at an unprecedented scale.

Add a comma at the underscore.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

https://www.omscs-notes.com/information-security/cyber-security/

The formula for risk leverage is shown as (post - pre)/cost, but it should be (pre - post)/cost. The former would generate a negative number since the risk exposure should always be lower after introducing a new control. The udacity lectures teach it as (pre - post)/cost.

With a virtual machine monitor (VMM or hypervisor) we virtualize all resources of the physical machine and make these virtual resources available to a guest operating system. The gues (typo here; should be guest) operating system does the resource management but the virtual machine monitor takes care of the resource allocation.

The answer to the following question is incorrect; question, as well as provided and correct answers are:

Question: In a public-key system using RSA, you intercept the ciphertext C=10 sent to a user whose public key is e=5, n=35. What is the plaintext M (as an integer)?

Provided Answer: n=35, so p = 7 and q = 5, so phi(n) = 6x4 = 24, so d = e^-1 mod phi(n) = 5, since 5x5 = 25 = 1 mod 24, M = C^d (mod N) = 10^5 mod 35 = 25

Correct Answer: 10^5 mod(35) = 25 should be 10^5 mod(35)=5

Answer should be E instead of B

in "Triple DES" section

To encrypt plaintext using triple DES, we first run the encryption process with key k1, followed by the decryption process with a second key k2, followed by the encryption process with a third key k3. To decrypt a ciphertext, we run the process in reverse, decrypting with k3, encrypting with k2, and decrypting again with k1.

"followed by the decryption process with a second key k2" should be changed into "followed by the encryption process with a second key k2"

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.
Under the Mandatory Access Control, Label Comparisons heading, there's an intersection operator instead of the "and" operator in the formal definition of determining which label is dominant--the lecture shows the use of and rather than an intersection of the level and compartment:

L1 > L2 (L1 dominates L2) if (L1.level \geq≥ L2.level) \cap∩ (L1.compartment \supset⊃ L2.compartment)
L1 < L2 (L1 is dominated by L2) if (L1.level \leq≤ L2.level) \cap∩ (L1.compartment \subset⊂ L2.compartment)
L1 = L2 if (L1.level = L2.level) \cap∩ (L1.compartment = L2.compartment)

https://github.com/m4ttsch/omscs-notes-notes/blob/master/machine-learning-trading/reading-plotting-stock-data.md#documentation

Last line should say pandas.DataFrame.tail

The CDF for Exp(λ) is incorrect here. Should be 1-e^(-λx)

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

In the OS Protection Boundary section. https://www.omscs-notes.com/operating-systems/introduction-to-operating-systems/#os-protection-boundary

mmap (memory) should be malloc (memory)

What needs to be fixed?

In the Deadlocks section, in the 4th paragraph --

This is where the problem lies. T2 will not be able to lock the mutex for A, because T1 is holding it. T1 will not be able to lock the mutex for B, because T1 T2 is holding it. More importantly, neither T1 nor T2 will be able to release the mutex that the other needs, since they are both blocking trying to acquire the mutex the other has.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

In "Learning APIs" - Code - "leaner" should be "learner" under both Linear Regression & KNN example codes.

Hi, I found a typo here
https://www.omscs-notes.com/operating-systems/distributed-file-systems/#sprint-dfs-from-analysis-to-design

Sprint Sprite DFS from Analysis to Design

Anw, thanks for the great notes!

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

Wrt file-descriptor table
https://www.omscs-notes.com/information-security/access-control/#how-does-the-os-implement-acl

This table holds pointers to the inode table and contains all of the files currently being accessed by the given file.

being accessed by the given file. should be being accessed by the given process.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

Duplicate image under Process Address Space

Is the image under "Process Address Space" supposed to be identical to the one under "What Does a Process Look Like?"

On the home page of omscs-notes I see a copyright notice that says "all rights reserved", but the repositories associated with the website are licensed MIT. Would it be more relevant to inform the user that the content is licensed under MIT so that they are aware of the permissions granted? What rights are you reserving that the user would otherwise have?

Here is a StackOverflow post I found about combining "all rights reserved" with MIT. A somewhat different use, the "all rights reserved" term is within the license in the post.

I believe the Georgia Tech professors that created the courses from which these materials are derived would be the owners of the copyright. One option might be to contact them and ask if they would be willing to license the work to you, or if they would release it to the public under a Creative Commmons license that allows commercial use.

I have always learned better from text content than from audio/visual and these kinds of things are a lifesaver for me. I think this product needs to exist, but I think there is some uncertainty in the continued existence/usefulness of the product. For these notes to remain available and relevant over the next 100 years some form of involvement in an official capacity from GA Tech will be useful.

Update: Asked on Piazza about the appropriate license for this repo - https://github.com/MatthewCaseres/secure-computer-systems, Prof. Mustaque is checking with GA Tech.

What needs to be fixed?
In the section Two Stock Scenario Quiz Solution, the line "Let's consider stock B now, which has a β of 2.0 and an α of -0.01. A β of 2.0 tells us that for every percentage point the market moves, stock A moves two percent. An α of -0.01 tells us that stock A will move 1% below its movement with the market." is probably meant to refer to stock B when talking about stock A.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

"Bob response with a random value r1, referred to as a challenge."
response -> responds. Security Protocols (Mutual Authentication: Shared Secret)

What needs to be fixed?
Replace too with to.

Current
if a page should be swapped out is too look

Suggested
if a page should be swapped out is to look

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

"we can define risk leverage L = (post - pre) / cost"

Risk leverage should be (pre - post) / cost. If pre is $5, post $4, and cost $0.50, then we have a risk leverage of 2, and the security fix should be implemented. In the above definition, the risk leverage would be -2, and would not be implemented despite the fix costing less than the amount of money saved by it.

form should be from
In this section

Describe all the steps which take place for a process to transition form a waiting (blocked) state to a running (executing on the CPU) state.
should be

Describe all the steps which take place for a process to transition from a waiting (blocked) state to a running (executing on the CPU) state.

Hi, I guess, there should be only one the in the last sentence of this chapter:
https://www.omscs-notes.com/operating-systems/io-management/#device-drivers

This helps to decouple the operating system from a fixed set of specific devices, which makes the the operating system independent of the devices it supports while also allowing it to support many different devices

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.
FEC (Forward Error Concealment) should be FEC (Forward Error Correction)

In midterm-1-study-guide.md at line 680 there is a missing question. Only the answers are present.

What needs to be fixed?
Please be specific as possible and add a link to the relevant file/lines.

Relevant section: https://www.omscs-notes.com/operating-systems/virtualization/#virtualization-models-bare-metal

Second paragraph: "In order words" should be "In other words"