Linux Project

Process of compiling the Linux kernel and working on various projects like adding new system calls, memory management, and process handling. Understand the essential steps and commands involved in kernel compilation. Dive into the significance of configuration files and the potential risks of misconfigurations. Discover efficient project solutions and system call hooking techniques. Get insights into the basics and complexities of Linux kernel development.

• Linux
• Kernel Compilation
• System Calls
• Project Development
• Memory Management

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Uploaded on Feb 22, 2025 | 0 Views

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Presentation Transcript

1. Linux Project

2. Outline How to compile linux kernel How to add a new system call Some Projects Example and Way to Solve it System Call Hooking by Module Project about Memory Project about Process

3. Download Link wget https://kernel.org/pub/linux/kernel/linux-2.6.18.tar.bz2 tar xvf linux-2.6.18.tar.bz2

4. The Beginning of everything

5. Compile Linux Kernel

6. It is Hard?

7. No, If you understand the concept

8. The Basic Process 0. make mrproper 1. make oldconfig 2. make j[n] 3. make modules_install 4. make install 5. reboot

9. Do You Know What It Means?

10. make mrproer Clean up the environment Will Remove almost everything, except .

11. make clean Almost the same as make mrproper.

12. make oldconfig Use the configuration file the current kernel is using. Some other alternative options. Make menuconfig

13. Is config File Important?

14. Config file Determine which kind of kernel you are compiling Determine which modules you want the kernel to compile. Misconfiguration will lead to kernel crash.

15. make j[n] Compile the whole source code according to your configuration

16. make modules_install Install the modules into the necessary folder. /lib/modules/`uname r`/

17. make install Install the image into the boot directory. Sometimes, update grub is necessary.

18. What Is System Call

19. Its a Bridge

20. Between Device Device User Device Device

21. Why System Call

22. Pop Quiz : Write A Program To Print Hello World

24. What You May Write

25. What Actually Happened .

26. User Application Printf libc.so System Call Kernel Code Device Driver IO Device

27. What If There Is No System Call

28. Everything Will Be x86 instruction in and out

29. Lets Focus On User Application Printf libc.so System Call Kernel Code Device Driver IO Device

30. Magic int 0x80

31. Before We Talk Further, Let s Talk About X86 Architecture

32. X86 Architecture Is Interrupt Driven

33. User Application Kernel Device Driver CPU 8259 PIC Device Device Device Device

35. How The CPU Find The Address of The Device Driver Code

36. Callback Mechanism

37. Kernel Device Driver Interrupt Descriptor Table Device Driver .. Device Driver Device Driver CPU 8259 PIC Device Device Device Device Physical Device

38. How About System Call

39. Magic int 0x80

40. System Call Handler Interrupt Descriptor Table syscall_table System Call Handler .. .. 0x80 .. System Call Handler CPU 8259 PIC int 0x80 Device Device Device Device Physical Device

41. cpu cs ds ss esp eip int 0x80 User Application CPU Stack Kernel

42. cpu cs ds ss esp eip int 0x80 User Application CPU Get TSS GDT Stack TSS

43. cpu cs ds ss esp eip int 0x80 User Application CPU Get TSS GDT Stack TSS

44. cpu cs ds ss esp eip int 0x80 User Application CPU Get IDT IDT ENTRY(system_call) Stack 0x80 sys_call_table

45. cpu cs ds ss esp eip int 0x80 User Application CPU Get IDT IDT ENTRY(system_call) Stack 0x80 sys_call_table

46. cpu cs ds ss esp eip int 0x80 User Application CPU Get IDT IDT ENTRY(system_call) Stack ss esp eflags cs eip 0x80 sys_call_table

47. How To Add A System Call

48. Add a System Call 1. cd $kernel_src 2. cd arch/i386/kernel/syscall_table.S 3. . .long sys_tee .long sys_vmsplice .long sys_move_pages .long sys_project Kernel.org/pub/linux/kernel /* 315 */ /* 318 */

49. Add a System Call cd linux/include/asm-i386/unistd.h #define __NR_vmsplice #define __NR_move_pages #define __NR_project 316 317 318 #ifdef __KERNEL__ #define NR_syscalls 319

50. Add a System Call cd linux/include/linux/syscalls.h asmlinkage long sys_set_robust_list(struct robust_list_head __user *head, size_t len); asmlinkage long sys_project( int i ); #endif

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