Set-UID lab

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Title: Set-UID lab

Essay Details:

Subject: Technology

Author: Walter K

Date: July 24, 2012

Level: University

Grade: A

Length: 3 / 780

Essay text:

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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