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Re: [RFC] a corner case of open(2)

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On Tue, 26 Apr 2016 18:55:38 +0100, Al Viro said:

> 	It is a change of user-visible behaviour, but I would be very
> surprised if anything broke from that change.  And it would help to simplify
> the awful mess we have in there.

I have to admit that over the past 3 decades of working with Unix-y systems,
there's been a number of times I've had to resort to 'od -cx /your/dir/here'
to debug issues (/bin/ls -fi is *almost* equivalent, but doesn't show holes
in the directory)

The biggest danger I can see is some shell script doing something like:

foobar > $dir/$targetfile

and $targetfile is unset. If we allow a program to get an open fd that refers
to a directory, what are the semantics of various operations on that fd?

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[RFC] a corner case of open(2) Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-26 20:00 +0200
  Re: [RFC] a corner case of open(2) Cedric Blancher <cedric.blancher@gmail.com> - 2016-04-26 20:10 +0200
    Re: [RFC] a corner case of open(2) Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-26 20:20 +0200
  Re: [RFC] a corner case of open(2) Valdis.Kletnieks@vt.edu - 2016-04-26 20:50 +0200
    Re: [RFC] a corner case of open(2) Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-26 21:10 +0200
      Re: [RFC] a corner case of open(2) Valdis.Kletnieks@vt.edu - 2016-04-26 21:30 +0200
        Re: [RFC] a corner case of open(2) Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-26 22:20 +0200
  Re: [RFC] a corner case of open(2) Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-27 07:40 +0200
    Re: [RFC] a corner case of open(2) Miklos Szeredi <mszeredi@redhat.com> - 2016-04-27 11:40 +0200
    another patch in #for-linus (was Re: [RFC] a corner case of open(2)) Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-27 21:40 +0200

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