How do I check the SUID bit?

WeNdeL · 12-17-2002, 03:14 PM

set/unset it?

unSpawn · 12-17-2002, 03:33 PM

To find 'em: "find / -perm -4000", then "chmod -s <filename>".
Don't wrap it up like "find / -perm -4000 | xargs chmod -s" because some binaries (like passwd) actually need the bit.

WeNdeL · 12-18-2002, 08:22 AM

so what does that extra most significant digit do?

I messed around with chmod last night and this is what I got:

chmod 4000 somefile

gave me ---S------

chmod 2000 somefile

gave gave me -----S------

chmod 1000 somefile

gave me ---------T

what is this?

what exactly does setting the SUID bit do?

I am using Rh 7.2 and 8.0 and the man page for chmod doesn't include the "-s" flag...

can someone further explain this?

WeNdeL · 12-18-2002, 02:37 PM

*bump*

moses · 12-20-2002, 01:02 AM

man chmod, the description's in the first few paragraphs.

The syntax for chmod looks a bit different from your typical UNIX
command, but isn't really that different. the "-s" "flag" is really a
mode, not an option (or flag).

The set (U/G)ID bit (S) is different from the sticky bit (T), and both
are explained in the first paragraphs on the man page.