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thesis: Add Understanding the Linux Kernel

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Lorenz Stechauner
2025-08-05 14:59:41 +02:00
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thesis/src/01.introduction.tex
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@@ -44,10 +44,12 @@ Intercepting calls to functions would one allow to see the name of the function,
In contrast to functions, system calls are calls to the kernel itself.
Many operations on a modern operating system require special privileges, which a simple user-space process does not have.
By invoking a system call, the (user-space) process hands control over to the (privileged) kernel and requests an operation to be performed.
\cite[Chapter~10]{linuxkernel}
How exactly these system calls work is architecture and system specific.
But generally, the process places the system call number, and its arguments in defined registers and then executes a special system call opcode.
Then the kernel executes the requested operation and places the return value inside another register, and lastly hands the execution back to the process.
\cite[Chapter~10]{linuxkernel}
Intercepting calls to system calls would one allow to see the system call number, arguments and return value.
One has to keep in mind, that many system-related functionalities are not in fact translated to system calls one-to-one.