Date: Thu, 1 Jan 2004 19:19:03 +1100 (EST)
From: Neale Banks <neale@lowendale.com.au>
To: Paul Jakma <paul@clubi.ie>
cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: chmod of active swap file blocks
In-Reply-To: <Pine.LNX.4.56.0312291719160.16956@fogarty.jakma.org>
Message-ID: <Pine.LNX.4.05.10401011905310.31562-100000@marina.lowendale.com.au>
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On Mon, 29 Dec 2003, Paul Jakma wrote:

[...]
> > Is chmod of an in-use swapfile an important thing to be able to do?
> 
> Had a box under memory pressure and had to add a swapfile to relieve
> said pressure. Noticed afterwards that it had been created under
> umask 0022 - not good, and the chmod to remove read rights for all 
> blocked. Thankfully, it was my desktop, not a multiple user server :)
[...]

How much of the original problem goes away if swapon(8) were to refuse to
activate a file/device which has ownership/mode which it doesn't like?

Of course such a change to swapon(8) should be accompanied by a flag to
force swapping on a file/device with non-sane ownership/mode.

Regards,
Neale.

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