Re: Subtle MM bug

[Andi Kleen]

On Wed, Jan 10, 2001 at 07:31:52PM +0000, Alan Cox wrote:
> > struct ucred is also needed to get LinuxThreads POSIX compliant (sharing
> > credentials between threads, but still keeping system calls atomic in
> > relation to credential changes) 
> 
> That is extremely undesirable behaviour. setuid() changes for pthreads crud
> should be done by the library emulation layer. Many people have very real
> and very good reasons for running multiple parallel ids. Just try writing
> a threaded ftp daemon (non anonymous) without that, or an nfs server

Of course not by default, it would be a new clone flag (with default to on in
linuxthreads though, to not cause security holes in ported programs like today) 

-Andi