Re: hardlinks to setuid binaries

[Brook Milligan <brook%nmsu.edu@localhost>]

> On Mar 25, 2022, at 3:42 PM, Robert Elz <kre%munnari.OZ.AU@localhost> wrote:
> 
> It depends how the update is done.   unlink old, install new,
> will have that effect, but chmod 0 old, unlink old, install
> new does not, nor does cp new old (in all cases, with
> needed chown, chmod, etc, done after the binary update as well).

So, how do pax, tar, and rsync do this?  I expect they are the common means of updating that might lead to this situation, and therefore perhaps likely candidates for reducing the problem (if they do it in an undesired way).

Cheers,
Brook