Re: odd chown difference between 2.0 and 2.1pre kernels

Tom Eastep (eastep@loc1.tandem.com)
Tue, 12 Jan 1999 16:27:05 +0000

"Stephen C. Tweedie" wrote:
>
> Hi,
>
> On Mon, 11 Jan 1999 15:40:02 +0000 (GMT), alan@lxorguk.ukuu.org.uk
> (Alan Cox) said:
>
> >> In message <19990109215152.C32046@kitenet.net>, Joey Hess writes:
>
> >> GAK!!! Security flaw here, methinks. chown should unconditionally clear
> >> setuid and setgid.
>
> > Except when done by root
>
> Is there any consensus on this? According to singleunix, suid and
> sgid on regular files get cleared unconditionally except when the
> caller has "appropriate privileges", but in that case the behaviour is
> implementation-defined. What do other unixen do in this case?

Solaris 2.5.1 retains suid and sgid...

# chmod g+x blub
# ls -l blub
-rw-rwxr-- 1 root other 0 Jan 12 08:23 blub
# chmod +x blub
# chmod +s blub
# ls -l blub
-rwsrwsr-- 1 root other 0 Jan 12 08:23 blub
# chown eastep blub
# ls -l blub
-rwsrwsr-- 1 eastep other 0 Jan 12 08:23 blub
# uname -a
SunOS eastep-5 5.5.1 Generic sun4m sparc SUNW,SPARCstation-20
#

-Tom

-- 
Tom Eastep
Compaq Computer Corporation
Enterprise Computing Group
Tandem Division
tom.eastep@compaq.com


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