Linux uses the “Change on Write” (COW) approach to reduce unnecessary duplication of memory objects.
How do you Cowsay?
Cowsay ships with few variations, called cow files, that can usually be found in /usr/share/cowsay. To see the cow file options available on your system, use -l flag after cowsay. Then, use the -f flag to try one out. $ cowsay -f dragon “Run for cover, I feel a sneeze coming on.”
What is Cowsay name?
cowsay is a program that generates ASCII pictures of a cow with a message. It can also generate pictures using pre-made images of other animals, such as Tux the Penguin, the Linux mascot.
What are kernel exploits?
Typically, a kernel exploit involves making a syscall (an interface that allows userspace processes to communicate with the kernel) with arguments designed specially to cause unintended behavior, despite the syscall attempting to only allow valid arguments.
What is a zero day threat?
A zero-day threat (also sometimes called a zero-hour threat) is one that hasn’t been seen before and doesn’t match any known malware signatures.
What is the difference between user space and kernel space?
Kernel space is strictly reserved for running a privileged operating system kernel, kernel extensions, and most device drivers. In contrast, user space is the memory area where application software and some drivers execute.
What is a zero hour attack?
“A zero-day (or zero-hour or day zero) attack or threat is an attack that exploits a previously unknown vulnerability in a computer application, one that developers have not had time to address and patch. There are zero days between the time the vulnerability is discovered (and made public), and the first attack.”
Why is it called Zero-Day?
The term “zero-day” refers to the number of days that the software vendor has known about the hole. The term apparently originated in the days of digital bulletin boards, or BBSs, when it referred to the number of days since a new software program had been released to the public.
What does 0day mean?
A zero-day (0day) exploit is a cyber attack targeting a software vulnerability which is unknown to the software vendor or to antivirus vendors. The attacker spots the software vulnerability before any parties interested in mitigating it, quickly creates an exploit, and uses it for an attack.