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To better control the resources available to processes started by the shell, the ulimit facility can be used System-wide defaults can be configured using the /etc/security/ limitsconf file ulimit options can be used to control such things as the number of files that may open, how much memory they may use, CPU time they may use, how many processes they may open, etc The settings are read by the PAM (Pluggable Authentication Module) libraries when a user starts up The key to choosing ulimit values is to consider the purpose of the system For example, in the case of an application server, if the application is going to require a lot of processes to run, then the system administrator needs to ensure that ulimit caps don t cripple the functionality of the system Other types of servers, such as a Domain Name System (DNS) server for example, should not need more than a small handful of processes It should be noted that there is a caveat here: PAM has to have a chance to run to set the settings before the user does something If the application starts as root and then drops permissions, PAM is not likely to run From a practical point of view, this means that having individual per-user settings is not likely to do you a lot of good in most server environments What will work are global settings that apply to both root and normal users This detail turns out to be a good thing in the end; having root under control helps keep the system from spiraling away both from attacks and from broken applications

Suppose ksanders was to create a new directory named revenue in her home directory and a file named projectionsodt in the revenue directory Based on what we just discussed, the revenue directory should have a mode of rwxrwxrwx and the projectionsodt file should have a mode of rw rw rw However, this isn t the case, as shown in Figure 7-34 Notice that the revenue directory has a mode of rwxr xr x (755) This means the directory owner has read, write, and execute permissions to the directory Group and Others have read and execute permissions to the directory Likewise, notice that the projectionsodt file has a mode of rw r r (644) The file owner has read and write permissions while Group and Other have only the read permission These aren t the default permissions Linux is supposed to assign! Why did this happen It s because the default permissions are too liberal Think about it The default directory mode would allow anyone on the system to enter any directory and delete any files they wanted to! Likewise, the default file mode would allow any user on the system to modify a file you created What a nightmare! To increase the overall security of the system, Linux uses a variable called umask to automatically remove permissions from the default mode whenever a file or directory is created in the file system The value of umask is a three-digit number, as shown in Figure 7-35 (ignoring the first 0) For most Linux distributions, the default value of umask is 022 Each digit represents a numeric permission value to be removed The first digit references you guessed it Owner, the second references Group, the last references Other

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A common trick that students still play on other students is to log into their workstations and run a fork bomb This is a program that simply creates so many processes that it overwhelms the system and brings it to a grinding halt For a student, this is annoying For a production server, this is fatal A simple shell-based fork bomb using Bourne Again Shell (BASH) is

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