├── ossp_individual_aweke-goshu_1600680_a.pdf
├── README.md
└── System_call.txt


/ossp_individual_aweke-goshu_1600680_a.pdf:
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https://raw.githubusercontent.com/1a2b3c4d5e6f7h/Qubes_OS_Installation/HEAD/ossp_individual_aweke-goshu_1600680_a.pdf


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/README.md:
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1 | This project deals with the installation process and explainig some concepts of Qubes OS. Qubes Os  is very important linux disttribution OS because it is mainly designed for security. however installing Qubes OS on virtual machine is not recommended. The resaon Why installing it on virtual machine is not recommended disscused in the decumentation part of the project # Qubes_OS_Installation
2 | 


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/System_call.txt:
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 1 | //assumes a linux kernel source tree and x86-64 architecture
 2 | //Create the system call function //kernel/sys_setid.c
 3 |  #include <linux/kernel.h>
 4 |  #include <linux/syscalls.h>
 5 |  #include <linux/cred.h>
 6 |  #include <linux/sched.h>
 7 |  #include <linux/uaccess.h> 
 8 |  Syscall_define1(setuid, uid_t, uid){
 9 |     Struct cred *new_creds;
10 |     new_creds = prepare_creds();
11 |        If (!new_cred)
12 | 	   
13 |         return -ENOMEM;
14 |   new_creds->uid.val=uid;
15 |   new_creds->euid.val=uid;
16 |   new_creds->suid.val=uid;
17 |   new_creds->fsuid.val=uid;
18 |     return commit_creds(new_creds) ;
19 | }
20 | 
21 |     Decleare it in include/linux/syscalls.h
22 |    asmlinkage long sys_setid(uid_t uid);
23 |    //Add it to the syscall table In arch/x86/entery/syscalls/
24 |      Syscall_64.tbl, add:
25 |     _NR_setid   548       common   setid
26 |               //make sure 548 is not already taken -adjust if needed
27 |            //Test with a simple program
28 |  #include <stdio.h>
29 |  #include <sys/syscall.h>
30 |  #include <unisted.h>
31 |  #define_NR_setid  548
32 |    Int main(){
33 |     uid_t uid= 1001;
34 |     long result = syscall(__NR_setid, uid);
35 |     Printf(“UID changed to %d successfully\n”, uid);
36 | else
37 |    Perror(“setid failed”);
38 | return 0;
39 | }
40 | 
41 | // this is how system call works
42 | 
43 | `
44 | 
45 | 


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