linux-kernel - Re: [RFC v6 03/40] vfs: Add MAY_DELETE_SELF and MAY_DELETE

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Message-ID: <CAHpGcM+i887PJ07_CNZ38aK0DhRWgmyYbAGrDN2i1xXkH+1rUg@mail.gmail.com>
Date:	Fri, 28 Aug 2015 23:54:11 +0200
From:	Andreas Grünbacher <andreas.gruenbacher@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	linux-cifs@...r.kernel.org,
	LSM List <linux-security-module@...r.kernel.org>,
	Andreas Gruenbacher <agruenba@...hat.com>
Subject: Re: [RFC v6 03/40] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD
 permission flags

2015-08-28 23:36 GMT+02:00 Andy Lutomirski <luto@...capital.net>:
> Silly question from the peanut gallery: is there any such thing as
> opening an fd pointing at a file such that the "open file description"
> (i.e. the struct file) captures the right to delete the file?
>
> IOW do we need FMODE_DELETE_SELF?

When would that permission be checked, what syscall would you use to
unlink an open file descriptor?

Thanks,
Andreas
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