Set-UID lab

Essay specific features

 

Issue:

Technology

 

Written by:

Hiram M

 

Date added:

May 26, 2013

 

Level:

University

 

Grade:

A

 

No of pages / words:

3 / 780

 

Was viewed:

8981 times

 

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Essay content:

Read the OS source codes of Minix, and figure out how SET-UID is implemented in the system. You should answer the following questions, and identify the corresponding codes in Minix: a. How does the OS recognize whether a file is a Set-UID? by checking an access right flag b. What does Minix do when a Set-UID program is executed? it does a validity check; then it get the exec file name and sees if the file is executable; fetches the stack from the user before the old core image; checks to see if the process' text can be shared with that one of already running; saves file id to allow it to be shared; patches up stack and copy it from MM to new core image; read in text and data segments; take care of setuid/setgid bits; save offset to initial argc; fix mproc fields, tell kernel that exec is done, reset caught sigs...
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What does Minix do when a Set-UID program is executed? it does a validity check; then it get the exec file name and sees if the file is executable; fetches the stack from the user before the old core image; checks to see if the process' text can be shared with that one of already running; saves file id to allow it to be shared; patches up stack and copy it from MM to new core image; read in text and data segments; take care of setuid/setgid bits; save offset to initial argc; fix mproc fields, tell kernel that exec is done, reset caught sigs...
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