linux-kernel - Re: [PATCH] Enabled pstore write for powerpc

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Date:   Thu, 27 Apr 2017 14:38:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ankit Kumar <ankit@...ux.vnet.ibm.com>
Cc:     Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Geliang Tang <geliangtang@....com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "mahesh@...ux.vnet.ibm.com" <mahesh@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Enabled pstore write for powerpc

On Thu, Apr 27, 2017 at 4:33 AM, Ankit Kumar <ankit@...ux.vnet.ibm.com> wrote:
> After commit c950fd6f201a kernel registers pstore write based on flag set.
> Pstore write for powerpc is broken as flags(PSTORE_FLAGS_DMESG) is not set for
> powerpc architecture. On panic, kernel doesn't write message to
> /fs/pstore/dmesg*(Entry doesn't gets created at all).
>
> This patch enables pstore write for powerpc architecture by setting
> PSTORE_FLAGS_DMESG flag.
>
> Fixes:c950fd6f201a pstore: Split pstore fragile flags
> Signed-off-by: Ankit Kumar <ankit@...ux.vnet.ibm.com>

Argh, thanks! I thought I'd caught all of these. I'll include this for -stable.

-Kees

> ---
>
>  arch/powerpc/kernel/nvram_64.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
> index d5e2b83..021db31 100644
> --- a/arch/powerpc/kernel/nvram_64.c
> +++ b/arch/powerpc/kernel/nvram_64.c
> @@ -561,6 +561,7 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
>  static struct pstore_info nvram_pstore_info = {
>         .owner = THIS_MODULE,
>         .name = "nvram",
> +       .flags = PSTORE_FLAGS_DMESG,
>         .open = nvram_pstore_open,
>         .read = nvram_pstore_read,
>         .write = nvram_pstore_write,
> --
> 2.7.4
>



-- 
Kees Cook
Pixel Security