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Set-UID lab
Essay specific features
Written by:
Hiram M
Date added:
May 26, 2013
Level:
University
Grade:
A
No of pages / words:
3 / 780
Was viewed:
9238 times
Rating of current essay:
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...
displayed 300 characters
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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...
displayed 300 characters
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