linux-kernel - Re: [PATCH 2/6] pstore/ram: Add console messages handling

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Date:	Wed, 16 May 2012 09:45:35 -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 2/6] pstore/ram: Add console messages handling

On Wed, May 16, 2012 at 5:56 AM, Anton Vorontsov
<anton.vorontsov@...aro.org> wrote:
> This is all straightforward: we just use the last region for
> console logging. If there's just one region, we fall-back to
> the old behaviour: just a oops/dumps logging.
>
> Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
> ---
>  fs/pstore/ram.c |   39 ++++++++++++++++++++++++++++++---------
>  1 file changed, 30 insertions(+), 9 deletions(-)
>
> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
> index 9123cce..54213eb 100644
> --- a/fs/pstore/ram.c
> +++ b/fs/pstore/ram.c
> [...]
> @@ -142,7 +148,12 @@ static int ramoops_pstore_write(enum pstore_type_id type,
>        struct persistent_ram_zone *prz = cxt->przs[cxt->count];
>        size_t hlen;
>
> -       /* Currently ramoops is designed to only store dmesg dumps. */
> +       if (type == PSTORE_TYPE_CONSOLE) {
> +               if (!cxt->cprz)
> +                       return -ENOMEM;
> +               persistent_ram_write(cxt->cprz, cxt->pstore.buf, size);
> +       }
> +
>        if (type != PSTORE_TYPE_DMESG)
>                return -EINVAL;

Doesn't this mean that type == PSTORE_TYPE_CONSOLE will write to the
ram, but then fail with -EINVAL?

-Kees

-- 
Kees Cook
Chrome OS Security
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