linux-kernel - Re: [RFC 2/2] initramfs with digital signature protection

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Message-ID: <22d54b6d-6342-4826-bb93-c9fc46f2041a@email.android.com>
Date:	Wed, 06 Feb 2013 08:41:23 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
CC:	Peter Jones <pjones@...hat.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 2/2] initramfs with digital signature protection

The cleanup is not a umount, it is actually a tree walk unlinking the contents.

"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com> wrote:

>On Wed, Feb 6, 2013 at 7:04 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 02/05/2013 02:09 PM, Kasatkin, Dmitry wrote:
>>>
>>>
>>> It should not be like that. Actually when pre-init exits, cleanup
>code
>>> umount tmpfs, which in turn cleanups the RAM.
>>>
>>
>> It doesn't quite... the rootfs is permanent.  This is also only one
>usage
>> mode: there are quite a few Linux systems running directly out of
>initramfs.
>>
>
>rootfs is not permanent when it is ramfs. It is cleaned up on switch
>root.
>It is easy to find out that it is empty by mounting : mount -t ramfs
>rootfs /mnt/
>
>In the case of running from normal storage, of course, there is
>ridicules remove the content.
>
>- Dmitry
>
>
>>         -hpa
>>
>>
>> --
>> H. Peter Anvin, Intel Open Source Technology Center
>> I work for Intel.  I don't speak on their behalf.
>>

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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