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Re: slow su? [solved]

On Fri, Aug 12, 2011 at 09:55:12PM +0200, Ian D. Leroux wrote:
 > > On Thu, Aug 11, 2011 at 09:11:41PM +0200, Ian D. Leroux wrote:
 > >  > Otherwise, you're liable to get bitten someday when the old
 > >  > kerberised PAM modules left behind by your first installation stop
 > >  > working, the PAM stacks fail to load and su (and probably other
 > >  > valuable bits of the system as well) refuse to run.
 > >  > 
 > >  > This is implicit in the NOTES section of pam.conf(5), but easily
 > >  > overlooked.
 > > 
 > > See PR 40599...
 > Precisely.  I take it that there has been no progress on the matter
 > in the last two years?

Yup. I was told that the fix I proposed (causing missing modules to
always fail) was unacceptable. Apparently the PAM semantics are so
fragile that any change to make it more robust also makes it fail open
in obscure ways, or something like that.

My opinion remains that PAM ought to go, but that's not trivial...

 > Being a stubborn fellow, I'll probably try commenting out all references
 > to pam_ksu and pam_krb5 in /etc/pam.d/* and see whether that improves
 > matters.  If it does, perhaps an ed script to do the same could be run
 > as part of the build process when Kerberos is disabled?

It could; the problem (or a problem) is that because those files are
in /etc the process of updating them in already-installed systems is

David A. Holland

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