linux-kernel - Re: nvdimm crash at boot

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Date:   Tue, 8 Jan 2019 15:34:12 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Dave Jiang <dave.jiang@...el.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: nvdimm crash at boot

On Tue, Jan 8, 2019 at 3:28 PM Dan Williams <dan.j.williams@...el.com> wrote:
> Ah, thanks for the report! The key difference is that you don't define
> a "label area", so the driver bails out early and never initializes
> the security state.
>
> This should fix it up.
>
> diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
> index 4890310df874..636cdb06ee17 100644
> --- a/drivers/nvdimm/dimm_devs.c
> +++ b/drivers/nvdimm/dimm_devs.c
> @@ -514,7 +514,7 @@ static umode_t nvdimm_visible(struct kobject
> *kobj, struct attribute *a, int n)
>
>         if (a != &dev_attr_security.attr)
>                 return a->mode;
> -       if (nvdimm->sec.state < 0)
> +       if (!nvdimm->sec.ops || nvdimm->sec.state < 0)
>                 return 0;
>         /* Are there any state mutation ops? */
>         if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable

Okay, cool. I wasn't sure if that test needed a deeper check. :)

Fixes: 37833fb7989a9 ("acpi/nfit, libnvdimm: Add freeze security
support to Intel nvdimm")
Tested-by: Kees Cook <keescook@...omium.org>

Thanks!

-- 
Kees Cook