We are trying to turn a program prog owned by the seed user into a Set-UID program that is owned by root. Can running the following commands achieve the goal?
$ sudo chmod 4755 prog
$ sudo chown root prog
No. Upon chown, or even file copy, the Set-UID bit is reset. So running chmod 4755 should always be the last step in the set up.

Question

09-12-2022
Computers and Technology

contestada

We are trying to turn a program prog owned by the seed user into a Set-UID program that is owned by root. Can running the following commands achieve the goal?
$ sudo chmod 4755 prog
$ sudo chown root prog
No. Upon chown, or even file copy, the Set-UID bit is reset. So running chmod 4755 should always be the last step in the set up.

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kumarprabhat kumarprabhat · Answer 1 · 2022-12-19T17:45:34+01:00

No. The Set-UID bit is reset during chown or even file copy. The final step in the setup process should therefore always be running chmod 4755.

Files that have executable permissions contain the set user id bit (setuid). The Set-UID bit only indicates that the executable will set its permissions to the owner's rather than the user who launched it when it is executed. Setuid is a Linux file permission setting that enables a user to run a file or application with the owner's consent. This is mostly used to increase the current user's privileges.

Using the command chmod 4755, for instance, would grant the owner read, write, and execute permissions, the user and group read and execute permissions, and set the setuid bit.

Learn more about Set-UID bit here:

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