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From: Daniel Phillips <phillips@arcor.de>
To: Luca Barbieri <ldb@ldb.ods.org>, trond.myklebust@fys.uio.no
Subject: Re: [PATCH] Initial support for struct vfs_cred   [0/1]
Date: Sun, 1 Sep 2002 17:15:30 +0200
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Cc: Linus Torvalds <torvalds@transmeta.com>,
       Linux FSdevel <linux-fsdevel@vger.kernel.org>,
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References: <Pine.LNX.4.44.0208311235110.1255-100000@home.transmeta.com> <15729.17279.474307.914587@charged.uio.no> <1030835635.1422.39.camel@ldb>
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On Sunday 01 September 2002 01:13, Luca Barbieri wrote:
> On Sun, 2002-09-01 at 00:30, Trond Myklebust wrote:
> > >>>>> " " == Luca Barbieri <ldb@ldb.ods.org> writes:
> > 
> >      > Then the rest of the code doesn't need to know at all that
> >      > credentials are shared and is simpler and faster.  We have
> >      > however a larger penalty on credential change but, as you say,
> >      > that's extremely rare (well, perhaps not necessarily extremely,
> >      > but still rare).
> > 
> > What if I, in a fit of madness/perversion, decide to use CLONE_CRED
> > between 2 kernel threads (i.e. no 'kernel entry')?
> You don't or you manually patch the task_struct of the other threads.
> This isn't a serious concern.

It is a serious concern.  Inventing new, subtle behavior differences 
between user and kernel threads is, in a word, gross.  It's certain
to bite people in the future.

-- 
Daniel
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