Lab #1 free essay sample

For the investigation purpose, Eyal needs to be able to read all the files in the company’s Unix system; on the other hand, to protect the integrity of the system, Eyal should not be able to modify any file. To achieve this goal, Ron, the superuser of the system, wrote a special set-root-uid program (see below), and then gave the executable permission to Eyal. This program requires Eyal to type a file name at the command line, and then it will run /bin/cat to display the specified file. Since the program is running as a root, it can display any file Eyal specifies. However, since the program has no write operations, Ron is very sure that Eyal cannot use this special program to modify any file. †¢ Set q = 0 in the program. This way, the program will use system() to invoke the command. Is this program safe? If you were Eyal, can you compromise the integrity of the system? For example, can you remove any file that is not writable to you? (Hint: remember that system() actually invokes /bin/sh, and then runs the command within the shell environment. We will write a custom essay sample on Lab #1 or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page We have tried the environment variable in the previous task; here let us try a different attack.Please pay attention to the special characters used in a normal shell environment). †¢ Set q = 1 in the program. This way, the program will use execve() to invoke the command. Are your attacks in task (a) still work? Please describe and explain your observations. 6) Relinquishing privileges and cleanup. To be more secure, Set-UID programs usually call setuid() system call to permanently relinquish their root privileges. However, sometimes, this is not enough. Compile the following program, and make the program a set-root-uid program. Run it in a normal user account, and describe what you have observed. Will the file /etc/zzz be modified?Please explain your observation. Advanced Set-uid security If your program must run setuid or setgid, make sure to use the privileges properly so that an attacker cannot exploit other possible vulnerabilities in your program and gain these additional privileges. You should perform whatever work requires the additional privileges as early in the program as possible, and you should drop the extra privileges immediately after that work is done. While many programmers may be aware of the need to drop privileges, many more are not. Worse, those who do know to drop privileges rarely know how to do so properly and securely.Dropping privileges is tricky business because the semantics of the system calls to manipulate IDs for setuid/setgid vary from one Unix variant to another—sometimes only slightly, but often just enough to make the code that works on one system fail on another. On modern Unix systems, the extra privileges resulting from using the setuid or setgid bits on an executable can be dropped either temporarily or permanently. It is best if your program can do what it needs to with elevated privileges, then drop those privileges permanently, but thats not always possible.If you must be able to restore the extra privileges, you will need to be especially careful in your program to do everything possible to prevent an attacker from being able to take control of those privileges. We strongly advise against dropping privileges only temporarily. You should do everything possible to design your program such that it can drop privileges permanently as quickly as possible. We do recognize that its not always possible to do—the Unix passwd command is a perfect example: the last thing it does is use its extra privileges to write the new password to the password file, and it cannot do it any sooner.Data Type: uid_t This is an integer data type used to represent user IDs. In the GNU library, this is an alias for unsigned int. Data Type: gid_t This is an integer data type used to represent group IDs. In the GNU library, this is an alias for unsigned int. Function: uid_t getuid (void) The getuid function returns the real user ID of the process. Function: gid_t getgid (void) The getgid function returns the real group ID of the process. Function: uid_t geteuid (void) The geteuid function returns the effective user ID of the process. Function: gid_t getegid (void) The getegid function returns the effective group ID of the process.

Sample Format For a Graduate School Essay

Sample Format For a Graduate School EssaySample format for a graduate school application is essential to ensure that you will know what to write on your application in order to excel. There are many different styles of applications and a sample format can make the process much easier.The application should be quick and easy to complete for the student. Too many students often spend too much time formatting their applications. The student should not rush in filling out the forms.For example, if you are writing a graduate school application, you should be able to change your name in the space provided. This will also allow you to enter your own first and last name for the space provided. The use of a code word or other method is not necessary but it will help the student to remember his or her own name for the space provided on the application.Students should also change the different style that is used on the application form. The lines that are used should be in a different font. The different styles will allow the student to quickly read and type the various sections. The different styles also help the student to make sure that the application is all in one place and easy to navigate.A sample format for a graduate school essay is also important in order to ensure that all of the information that is required is included on the form. Each section should be concisely completed and should include all information that is needed for the application. It is recommended that the form has two sections, one for each type of college.A student should not fill out all of the information on the application unless he or she is applying to more than one college. This allows the student to take time to organize the application for each college and find the information that is needed to fill out the forms. If there are additional sections that need to be filled out, then the student should check with the college in order to get all of the information for each college.It is impor tant to remember that filling out the forms is to have the main purpose of keeping the application in one place. The student should also make sure that he or she will be using the application for college in order to find the proper information that is needed for the application. It is also helpful to check the application with the college in order to determine what information is needed for the application.In order to get an idea of what the student should include on the sample format for a graduate school application, the student should ask for a copy of the form from the college that he or she is applying to. This will allow the student to see what the various sections look like. By taking a look at the sample format, the student will be able to better see what will be required for each section of the application.

Cursive Writing for Learning Disabled

Cursive Writing for Learning Disabled Its not uncommon for special education students to struggle with writing. Dyslexia, dysgraphia, and various kinds of language-based disorders make themselves very pronounced when children are learning to write. But its less common for teachers to make this counter-intuitive move: Try cursive.   Generally considered to be more difficult for children than writing in manuscript (block letters) and losing ground in the battle for productive class time, script is finding a late-career resurgence with the special-ed crowd. Not only are there benefits to cursive writing that bleed into other skills (for example, the fine-motor workout of cursive writing has salutary effects on similar fingerwork), some scientists believe that children who can write neatly in script are better at math and other analysis. Why You Should Consider Cursive If handwriting is a struggle, give cursive writing a shot. Dont worry that handwriting (and reading handwriting) is becoming something of a lost art- all students, especially special ed kids, benefit from successes. Here are some reasons you may want to flip the script in your classroom: The letters flow much more easily, and usually only one movement is necessary. Children often struggle with the many fine movements required to print. For children with motor-planning issues, remembering where to put the circles and sticks, crossing ts and dotting is, and remembering the orientation of each letter is no easy task. How often have you seen these children confuse bs and ds and put the circles on ps on the wrong side?Spaces separate words in cursive, while the letters are joined. Therefore, phonetics are joined together. Many students find that script writing is conceptually easier to grasp in this regard.  Rarely will you see reversals in cursive writing, unlike printing. Children respond well to the left-to-right flow of writing.Teaching cursive saves time. Why spend time to learn printing first, when children will learn it through reading? Its simply not essential to have students print and learn cursive at the same time.  Most teachers report that children who le arn handwriting exclusively show no difficulties reading print. Thats not always the case when children learn printing first. In fact, many teachers moving to cursive writing instead of print report that it was the best move for their students. Some Advice for Teaching Cursive Stick with it.Begin with the letters without loops (t, i, d, p, m, n, r).Show the child how to slant the paper to make writing more natural.Begin with lowercase letters.Remember that motor skills of children with learning disabilities are often weak, provide dotted cursive writing paper for ease and guide the childs hand. Direct teaching is recommended. Remember to be patient, in the long run youre saving teaching time!

Analysis of Oath of the Horatii

Analysis of Oath of the Horatii Essay French artist, Jacques-Louis David’s painting, Oath of the Horatii, is one of the most recognizable works of the nineteenth century. This painting is important in the history of French painting. Oath of Horatii was painted in Rome in the style of Neo-Classicism (Kumskova). The French artist oil on canvas painting demonstrates a dramatic portrayal of the Horatii brothers swearing their allegiance to the state as their father stands with swords held high for them to grasp. This painting also depicts a scene about a dispute from a Roman legend about a dispute between two warning cities, Rome and Alba Longa, which stresses the importance of masculine self-sacrifice for one’s country and patriotism when the three Horatii brothers are about to go to war for their country (Wikipedia). The dà ©cor of this Neo classic painting is reduced to a more abstract order, which is architectural space: massive columns and equally massive arches opening out onto a majestic shadow (Wikipedia). The three archways are proportioned in size and space, which also corresponds into three groups. Instead of, Jacques-Louis David opening his painting out onto a landscape or an expansion of the sky, he closes it off to the outside (Kumskova). David’s choices of the architecture and lack of landscape helps make the piece of art more personal and historic. The dà ©cor not only enhances the painting’s true value, but provides the viewer with a well blended array of colors. The choice of colors are limited, but well balanced. David’s color selection seems to consist of red, blue, brown, white, black, and flesh tones. The vibrant red of the cloak of Horatii draws the viewers to the center (Kumskova). The Horatii brothers clothing are of red, white, and blue as they prepare to patriotically fight for the glory of Rome (Wikipedia). Yet, the women in the corner with a sullen mood have earth tone colors. In addition, the scene is closed off from the rest of the world by shadowy recesses among the columns. Throughout Oath of Horatii, the use of shadow helps add depth in the basic colors and give variations of hue. The Oath of Horatiis use of dull colors show the importance of the story behind the painting and also demonstrates the neoclassical art style, which employs the principles of designs. The storyline of Oath of the Horatii is a landmark composition, symbolically and pictorially. The painting is set against a dark, muted classical background that emphasizes the true background and emotion of this masterpiece. The theme of the painting has a patriotic and neoclassical perspective. The atmosphere is softened by shades of green, brown, pink, and red, which are all very discreet. The light in the setting takes on a brick toned reflection, which encircles David’s figures with a mysterious halo as a result (Kumskova). Besides the storyline of the three Horatii brothers, viewers can see the side of the painting that show the women and children of the family mourning the sons’ departure, which intertwines with the dark toned colors of the painting. David’s placement of figures and forms in the canvas act as a way to tell the story of this history’s painting , but most importantly offers more subtle hints to what happens next (Kumskova). David’s ‘The Oath of Horatii’ is one of the hallmark paintings of the neoclassical movement in which artists looked to antiques of Greece and Rome to inspire their generations like David (Wikipedia). Bibliography: Kumskova, Marina. David, Oath of the Horatii, 1784: Analysis. N.p., 13 Mar. 2013. Web. 19 Mar. 2015. Oath of the Horatii. Wikipedia. Wikimedia Foundation, n.d. Web. 17 Mar. 2015.

Election Analysis Paper Essay Example | Topics and Well Written Essays - 1250 words

Election Analysis Paper - Essay Example While Republicans had focussed their attention on the ailing economy and the proposed universal healthcare insurance taxation program, Democrats seemingly waiting on the little flaws and capitalized on them (Mathes and Presse 1). Perhaps what sold Obama candidature was the fact that he maintained close connection with the average Americans and proposed policies that most appealed to the majority. The importance of the presidential election was that it was going to determine what policies were going to be in force. Those interviewed by various media houses such as CNN had observed that the most pertinent concern for most Americans was the ailing economy which both candidates made promises to resolve once in office. While the Romney team had underplayed the Obama’s second term presidency on grounds that the next four years would be a repeat of the same policies, Obama had focussed on wooing voters that governor Romney promised to solve the problems without revealing his intended working formula (Mathes and Presse 1). Other issues that had played in the presidential race were foreign policy issues and the perceived manipulation of currency by China. Whether these issues were of primary concern to the common citizen, more than the joblessness and the healthcare program, or not, remain debatable. Even so, it emerged that security issues played a significant role in boosting Romney’s bid. Matters such the bombing of the US embassy in Libya were some of the issues that played significant role in the presidential race. This was because the initial intelligence report had blamed the attack on sporadic attacks rather than on terrorism. Therefore, as America went to the ballot in a hot contest of Obama-Biden versus Romney-Ryan, political commentators had observed that the outcome was largely unpredictable although Obama still had marginal points ahead of Romney prior to the elections. The only thing that was certain was that the difference in the outcomes wo uld not be too big for whomever candidate wins. Working with volunteers, Democrats employed the formula of early voting where varied slogans motivating people were twitted and re-twitted. Although both sides invested heavily in advertising, political observers have attributed the success of the Obama presidency to the door-to-door campaigns (Cohen 1). As election results trickled in, the prediction that political analysts had made that the outcomes would be a picture of a hotly contested poll became apparent. Obama managed to emerge triumphant over Romney to become the second democrat after Bill Clinton to win a second term since Second World War. By managing to clinch a total of 65,258,278 popular votes and 332 electoral votes against Romney’s 60,658,920 popular votes and 206 electoral votes, one may observer that Republicans did not fair so badly in the presidential vote although they lost. Again, analysts have observed that the wives of both Obama and Romney also had some contribution to the outcomes with Michelle Obama being the most popular of the presidential aspirants (Horsey 1). Probably one could ask why the elections turned out as it did and what the contributing factors were. One may observe that voters’ decision was likely to have been influenced by a number of factors. Such were issues most pertinent to the electorate as well as those for which their preferred party stood. It is interesting to

Modern IT Infrastructure Essay Example | Topics and Well Written Essays - 1750 words

Modern IT Infrastructure - Essay Example There are additional expenses that are to be bore because of training costs for the employees, establishment of an Information Technology Department in the organization for regular functioning of the system. Henceforth there are costs involved but definitely the benefits far outweigh the costs. Our company is now competing for market in a highly dynamic and challenging environment and therefore it is imperative that we establish quick, reliable and efficient information processing and business processing system within the organization, which unfortunately is not possible within the domains of out existing IT infrastructure which is based on batch type computers working without Virtual memory. It is therefore recommended that the current system be upgraded with a newer system with capabilities for multi programming and virtual memory. The report attempts to justify the proposed requirements in the light of current and future business processes. Multi-programming or Multi Tasking is the ability of a computer to perform simultaneous processing on various projects or as a part of one project or task. It is a much better computing system over the old batch type systems with possibility of calculating two requirements at a time and therefore considerably reducing the processing time and therefore saving the time by doing calculations which is wasted during user input process. It ensures that the idle time between calculations of one requirement can be used for another requirement and therefore can process lots of requirements simultaneously. This reduces overall processing time and increases the efficiency of the system and the cuts off time from the whole process. Most of the time used on a computer is used in inputting the data and afterwards the calculations is generally the smaller part. The batch type system processes the requirements one at a time whereas a

Computer Engineer :: essays research papers

Introduction and History Computer engineering is a very time consuming, challenging job. To be a good computer engineer you need years of experience and collage education. Computer engineers provide information and data processing for certain computer firms and organizations. They conduct research, design computers, and discover and use new principles and ideas of applying computers. I am going to tell you specific facts about the careers of computer engineers like payment, education needed, skills, responsibilities of the job, job outlook, and benefits of the job. Computer engineering started about 5,000 years ago in China when they invented the abacus. The abacus is a manual calculator in which you move beads back and forth on rods to add or subtract. Other inventors of simple computers include Blaise Pascal who came up with the arithmetic machine for his father’s work. Also Charles Babbage produced the Analytical Engine, which combined math calculations from one problem and applied it to solve other complex problems. The Analytical Engine is similar to today’s computers. Occupation’s Duties A computer engineer has certain duties and responsibilities depending on the location and size of the firm he or she works for. Also the duties vary between job levels. If you work at a small firm, you will be set up on the firing line immediately and will be expected to make your boss money or you’ll be fired. Also in a smaller firm you’ll probably spend hours of pain-staking time trying to solve a problem that other engineers probably went over before. In larger firms, you’ll be hired probably as a junior computer engineer and work your way up to senor and maybe manager of engineers. If you enjoy challenging work and problem solving, your best place to be is in a small firm. If you enjoy problem solving but not to the severe degree as in a small firm, then your place is in a larger firm. Overall, the responsibilities and duties are basically the same. These duties include preparing cost benefit analysis on programs, determining copter soft and hardware needs, and debugging computers to eliminate errors. Benefits The benefits of being a computer engineer are unique to those people who like having challenges put in-front of them to solve. This job puts you in challenging positions that you have to problem solve to get out of. Also computer engineers have the ability to fix or even their own computers. Computer engineers get paid vacations, holidays, and sick days.