[HEADSUP] Disallowing read() of a directory fd

[Joerg Sonnenberger]

On Fri, May 15, 2020 at 10:25:26PM +0200, Arne Steinkamm wrote:
> On Fri, May 15, 2020 at 01:00:55PM -0700, Cy Schubert wrote:
> > It's been 42 or more years since this bug was introduced. Let's just fix it 
> > now instead of agonizing over it.
> 
> I didn't want to add something as everything is said,
> but this sentence is a little bit to provocative.
> 
> Everything is a file describes one of the defining features of Unix.
> 
> Calling this defining feature of Unix a bug shows to me that the ideas
> behind Unix got lost in the FreeBSD universe too...

Using linear storage for a directory is an implementation detail of the
implementation. It's not a defining feature. "Reading" from a directory
doesn't make sense for many other organisational forms. So, are you now
arguing that leaky abstractions are a defining feature of Unix?

Joerg