linux-kernel - Re: [PATCH 02/16] pstore/ram: Should update old dmesg buffer before reading

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Message-ID: <CAGXu5jJ49LxeNgznWzW-Lb77jqUWkQLtUm855ExPhsZS7PowgQ@mail.gmail.com>
Date:	Tue, 22 May 2012 08:25:33 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>, Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkhan@...il.com>, arve@...roid.com,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Jesper Juhl <jj@...osbits.net>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com
Subject: Re: [PATCH 02/16] pstore/ram: Should update old dmesg buffer before reading

On Tue, May 22, 2012 at 7:17 AM, Anton Vorontsov
<anton.vorontsov@...aro.org> wrote:
> Without the update, we'll only see the new dmesg buffer after the
> reboot, but previously we could see it right away. Making an oops
> visible in pstore filesystem before reboot is a somewhat dubious
> feature, but removing it wasn't an intentional change, so let's
> restore it.
>
> For this we have to make persistent_ram_save_old() safe for calling
> multiple times, and also extern it.
>
> Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>

Acked-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook
Chrome OS Security
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