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Udemy - System Calls in deep



Udemy - System Calls in deep

Genre: eLearning | MP4 | Video: h264, 1280x720 | Audio: aac, 44100 Hz
Language: English | Size: 2.08 GB | Duration: 4h 56m


What you'll learn
Basics of Inline Assembly
Writing examples for Inline Assembly
Various places where inline assembly is used
Adding a new system call to kernel
Updating system call table
VDSO and Virtual System Calls
Requirements
Should have a basic understanding of Linux Kernel modules
C language
Description
What will you learn from this course?
Basics of Inline Assembly
Types of Inline Assembly: Basic and Extended
GCC Assembly Syntax: AT&T
Constraint strings
Input and output operands
Clobbering
Various use cases of Inline assembly in Linux kernel: Interrupts, I/O Ports, Atomic operations, CPUID, Control Registers, Timestamp counters etc
Deep understanding of system calls: Various ways of switching from user space to kernel space (int $0x80, sysenter/sysexit, syscall/sysret)
VDSO
Adding a new system call which doesn't accept any arguments
Adding a system call which accept argument
Kernel Symbols and Kernel Symbol table
Writing a kernel module which overwrite the kernel symbol table
Writing a kernel module which sniffs the parameters passed to a system call
Examples covered in this course:
Add two numbers in inline assembly
Add three numbers in inline assembly
Subtract, divide, multiply in inline assembly
Can we disable/enable interrupts in user space
Checking whether interrupts are enabled and disabled in user space
Enabling/Disabling interrupts in user space
Implementing simple locking to avoid race conditions: Lock prefix, compare and exchange instructions
And many
Who this course is for:
Linux Kernel Developers interested in gaining deep knowledge on how system call works

Homepage
https://www.udemy.com/course/system-calls-in-deep/


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