linux-kernel - Re: [PATCH] ramoops: Add a device file for ramoops buffer access.

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Message-ID: <4EB886E2.1000504@zytor.com>
Date:	Mon, 07 Nov 2011 17:33:22 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bryan Freed <bfreed@...omium.org>
CC:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, msb@...omium.org,
	marco.stornelli@...il.com, seiji.aguchi@....com,
	tony.luck@...el.com
Subject: Re: [PATCH] ramoops: Add a device file for ramoops buffer access.

As I mentioned to Kees on IRC, you probably want to talk to Tony Luck
about his pstore interface, too.

On 11/07/2011 05:04 PM, Bryan Freed wrote:
> Yeah, we should definitely work together on this.
> 
> bryan.
> 
> On Mon, Nov 7, 2011 at 4:36 PM, Kees Cook <keescook@...omium.org> wrote:
>> Hi Bryan,
>>
>> On Mon, Nov 07, 2011 at 04:06:00PM -0800, Bryan Freed wrote:
>>> Add a /dev/ramoops device file that gives direct access to ramoops buffers.
>>> This interface is cleaner than using /dev/mem to access the buffers because
>>> we no longer need to lseek() or (for ARM) mmap() to an address specified in
>>> the sysfs mem_address file.
>>
>> This looks pretty good, except that I'd also want to remove all the module
>> parameters since this would bypass CONFIG_STRICT_DEVMEM (imagine a
>> malicious root user loading this module to spy on RAM via the new
>> interface).
>>
>> Last week I actually wrote an entire seq_file interface for ramoops[1], but
>> it seems it shouldn't live in /proc, so it needs to be reworked a bit to
>> live in /dev, as you have it.
>>
>> Perhaps we could merge our efforts?
>>
>> -Kees
>>
>> [1] https://gerrit.chromium.org/gerrit/#change,11242
>>
>> --
>> Kees Cook
>> ChromeOS Security
>>
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