Re: FD's 0..2 and suid/sgid procs (Was: Crash a redhat 5.1 linux

[alan () LXORGUK UKUU ORG UK (Alan Cox)]

> Alan Cox actually is the first person who highlighted this sort of
> vulnerability to me.  Does anyone know if the OpenBSD approach is

Im certainly not its discoverer however.

> suid/sgid program bogus stdin/stdout/stderr)?  Also, is a similar patch
> in the works for Linux?  (I ask, because I'm a Linux user myself.)

Someone was working on one yes

> And, is there any overwhelming reason why you wouldn't make the same
> guarantee that fd's 0..2 are open for all processes, rather than just
> suid/sgid processes?

Actually for the general case you shouldnt do it. Passing a closed fd
is valid Unix behaviour, so you cease to really be "unix" by doing it.

Obviously there are sometimes advantages to not following unix tradition
totally