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From: Paul Hartman <paul.hartman+gentoo@gmail.com>
Date: Wed, 2 May 2012 17:02:17 -0500
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Subject: Re: [gentoo-user] Re: Any experience with swapfiles?
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On Wed, May 2, 2012 at 4:50 PM, walt <w41ter@gmail.com> wrote:
> On 05/02/2012 01:58 PM, Simon wrote:
>
> <excellent help snipped for brevity>
>
>> Except for issue pointed out by Paul about hibernation
>
> That's an interesting point, and the reason for the problem is definitely
> not obvious to me. =A0Anyone know the technical details?
>
>> As for security, having a swap is less
>> secure than having none: =A0a malicious persion could extract
>> information from programs memory which was swapped
>
> BTW, man mkswap says nothing about proper file permissions for a swapfile=
.
> I'm guessing that only root should be able to read the file?
>
>

Actually it looks like it may be possible, depending on which method
you use for suspending. Here's a kernel document talking about using
swap files and swsusp:

https://www.kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt