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

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Message-ID: <CAEYUcX3wKfQZGFbRuRHgE8wuc_=Jm+-9s68tb20jkd_yqRHOjA@mail.gmail.com>
Date:	Mon, 7 Nov 2011 17:04:14 -0800
From:	Bryan Freed <bfreed@...omium.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	msb@...omium.org, marco.stornelli@...il.com, seiji.aguchi@....com
Subject: Re: [PATCH] ramoops: Add a device file for ramoops buffer access.

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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