Re: [PATCH v4 24/24] integrity/powerpc: Support loading keys from pseries secvar

From: "Nicholas Piggin" <npiggin@gmail.com>
To: "Andrew Donnellan" <ajd@linux.ibm.com>,
	<linuxppc-dev@lists.ozlabs.org>,
	<linux-integrity@vger.kernel.org>
Cc: <sudhakar@linux.ibm.com>, <bgray@linux.ibm.com>,
	<erichte@linux.ibm.com>, <gregkh@linuxfoundation.org>,
	<nayna@linux.ibm.com>, <linux-kernel@vger.kernel.org>,
	<zohar@linux.ibm.com>, <gjoyce@linux.ibm.com>,
	<ruscur@russell.cc>, <gcwilson@linux.ibm.com>, <joel@jms.id.au>
Subject: Re: [PATCH v4 24/24] integrity/powerpc: Support loading keys from pseries secvar
Date: Tue, 24 Jan 2023 15:24:25 +1000	[thread overview]
Message-ID: <CQ064REW0ZEO.1LUHVNN78TBRJ@bobo> (raw)
In-Reply-To: <20230120074306.1326298-25-ajd@linux.ibm.com>

On Fri Jan 20, 2023 at 5:43 PM AEST, Andrew Donnellan wrote:
> From: Russell Currey <ruscur@russell.cc>
>
> The secvar object format is only in the device tree under powernv.
> We now have an API call to retrieve it in a generic way, so we should
> use that instead of having to handle the DT here.
>
> Add support for pseries secvar, with the "ibm,plpks-sb-v1" format.
> The object format is expected to be the same, so there shouldn't be any
> functional differences between objects retrieved from powernv and
> pseries.
>
> Signed-off-by: Russell Currey <ruscur@russell.cc>
> Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
>
> ---
>
> v3: New patch
>
> v4: Pass format buffer size (stefanb, npiggin)
> ---
>  .../integrity/platform_certs/load_powerpc.c     | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/security/integrity/platform_certs/load_powerpc.c b/security/integrity/platform_certs/load_powerpc.c
> index dee51606d5f4..d4ce91bf3fec 100644
> --- a/security/integrity/platform_certs/load_powerpc.c
> +++ b/security/integrity/platform_certs/load_powerpc.c
> @@ -10,7 +10,6 @@
>  #include <linux/cred.h>
>  #include <linux/err.h>
>  #include <linux/slab.h>
> -#include <linux/of.h>
>  #include <asm/secure_boot.h>
>  #include <asm/secvar.h>
>  #include "keyring_handler.h"
> @@ -59,16 +58,22 @@ static int __init load_powerpc_certs(void)
>  	void *db = NULL, *dbx = NULL;
>  	u64 dbsize = 0, dbxsize = 0;
>  	int rc = 0;
> -	struct device_node *node;
> +	ssize_t len;
> +	char buf[32];
>  
>  	if (!secvar_ops)
>  		return -ENODEV;
>  
> -	/* The following only applies for the edk2-compat backend. */
> -	node = of_find_compatible_node(NULL, NULL, "ibm,edk2-compat-v1");
> -	if (!node)
> +	len = secvar_ops->format(buf, 32);

sizeof(buf)?

Thanks,
Nick