Fwd: Re: need help with an rsync patch

[Matthias Schniedermeyer]

On 13.08.2013 14:18, Paul Slootman wrote:
> On Tue 13 Aug 2013, Matthias Schniedermeyer wrote:
> > > 
> > > > Hardlinking a file doesn't change it's owner/group/permission 
> > > > (All Hardlinks have the same user/group/permissions).
> > > 
> > > I never said that.
> > 
> > You implied that by your assertion that you suddenly can read a file 
> > after hardlinking it.
> 
> NO!
> 
> I implied that if you have the permissions to make the hardlink,
> then you also have the permissions to chmod the file.
> It seems you don't want to understand what _I_ am saying.

ln /etc/shadow my_shadow

ls -l my_shadow
-rw-r----- 2 root shadow 1379 Mar  5 13:55 my_shadow

chmod 777 my_shadow
chmod: changing permissions of 'my_shadow': Operation not permitted

ls -l my_shadow
-rw-r----- 2 root shadow 1379 Mar  5 13:55 my_shadow

Unless i'm testing it wrong.


> > > I said that if a hardlink can be made (and I meant on a modern linux
> > > kernel, with default settings) then the user already has permissions to
> > > do anything with the file. I forgot already about the old semantics :)
> > 
> > Did you read what i just wrote?
> 
> Ditto.
> 
> > You can't do anything more to the file than before you hardlinked it. 
> 
> Did you read what i just wrote?
> 
> Try it on a 3.6 linux kernel.

I tested with 3.10.6

But:
sysctl fs.protected_hardlinks
fs.protected_hardlinks = 0




-- 

Matthias