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suid with execute set for passwd

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# 1  
Old 05-04-2011
Question suid with execute set for passwd
Hello All,

We could see that suid with execute is set for passwd:

-rwsr-xr-x 1 root root 22960 Jul 17 2006 /usr/bin/passwd

that means if any user execute command passwd that will be executed with root priviledge then why a normal user was not able to change other user password

any immediate reply is appriciated.
# 2  
Old 05-04-2011
Even if run as an ordinary user, it still needs root access to allow a user to change their own password -- that involves changing the /etc/shadow file and so forth, things which can only be written to by root.

The passwd program checks what the actual user is and who's allowed to change the passwords for what and so forth by itself, instead of having that enforced by the system.
# 3  
Old 10-29-2011
CPU & Memory
You need to learn advance file permissions, SUID,SGID and Stickybit.
Check bellow link to understand SUID bit with an example.
I hope it clears all your doubts.

UNIX/Linux Bash Shell Scripting: UNIX/Linux Advanced File Permissions - SUID,SGID and Sticky Bit
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