linux-kernel - Re: [RFC/PATCH] revoke/frevoke system calls V2

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Date:	Thu, 27 Jul 2006 19:34:22 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Petr Baudis <pasky@...e.cz>
Cc:	Pekka J Enberg <penberg@...Helsinki.FI>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...l.org, viro@...iv.linux.org.uk, tytso@....edu,
	tigran@...itas.com
Subject: Re: [RFC/PATCH] revoke/frevoke system calls V2

Ar Iau, 2006-07-27 am 20:06 +0200, ysgrifennodd Petr Baudis:
> Well, except that you can revoke the log file before the shadow file is
> opened, at which point open() probably reuses the fd and the program
> conveniently logs to /etc/shadow.

revoke() kills *access* by that handle, it does not kill the fd. The BSD
designers thought of that one. Instead you end up with a handle that
reports -ENXIO (from memory) for I/O accesses, ioctl etc until you close
it when it goes away as expected.

Alan

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