Re: odd chown difference between 2.0 and 2.1pre kernels

Miquel van Smoorenburg (miquels@cistron.nl)
11 Jan 1999 17:51:54 +0100

In article <cistron.199901110125.UAA24076@rushlight.kf8nh.apk.net>,
Brandon S. Allbery KF8NH <allbery@kf8nh.apk.net> wrote:
>In message <19990109215152.C32046@kitenet.net>, Joey Hess writes:
>+-----
>| On a 2.1pre4 machine:
>| root@kite:~>ls -l foo
>| -rwsrw-r-- 1 root joey 0 Jan 9 17:13 foo*
>| root@kite:~> chown root.root foo; ls -l foo
>| -rwsrw-r-- 1 root root 0 Jan 9 17:13 foo*
>+--->8
>
>GAK!!! Security flaw here, methinks. chown should unconditionally clear
>setuid and setgid.

Not unconditionally. It should only happen on regular files and not
directories. Now 2.0.x and 2.1.x cleared the setuid/setgid bit on
directories too, and that got fixed. However it looks like it
got fixed a bit too much :/

Mike.

-- 
Indifference will certainly be the downfall of mankind, but who cares?


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