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Date: Mon, 13 Mar 2017 08:55:21 +0100
From: Sascha Hauer <s.hauer@pengutronix.de>
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Subject: Re: [PATCH 4/5] boot: if we are in secure boot mode
To: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: barebox@lists.infradead.org

On Thu, Mar 09, 2017 at 03:34:09PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> request confirmation before booting an unsigned image
> 
> with a default timeout
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  commands/go.c         |  7 +++++++
>  common/Kconfig        |  8 ++++++++
>  common/Makefile       |  1 +
>  common/bootm.c        |  7 +++++++
>  common/secure_boot.c  | 43 +++++++++++++++++++++++++++++++++++++++++++
>  include/bootm.h       |  1 +
>  include/secure_boot.h | 25 +++++++++++++++++++++++++
>  7 files changed, 92 insertions(+)
>  create mode 100644 common/secure_boot.c
>  create mode 100644 include/secure_boot.h
> 
> diff --git a/commands/go.c b/commands/go.c
> index fb319b320..61c9ce43f 100644
> --- a/commands/go.c
> +++ b/commands/go.c
> @@ -26,6 +26,7 @@
>  #include <fcntl.h>
>  #include <linux/ctype.h>
>  #include <errno.h>
> +#include <secure_boot.h>
>  
>  static int do_go(int argc, char *argv[])
>  {
> @@ -37,6 +38,12 @@ static int do_go(int argc, char *argv[])
>  	if (argc < 2)
>  		return COMMAND_ERROR_USAGE;
>  
> +	rcode = secure_boot_start_unsigned();
> +	if (rcode)
> +		return rcode ? 1 : 0;
> +
> +	rcode = 1;
> +
>  	if (!isdigit(*argv[1])) {
>  		fd = open(argv[1], O_RDONLY);
>  		if (fd < 0) {
> diff --git a/common/Kconfig b/common/Kconfig
> index f7ff04664..9e7d027a2 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -21,6 +21,9 @@ config HAS_KALLSYMS
>  config HAS_MODULES
>  	bool
>  
> +config HAS_SECURE_BOOT
> +	bool
> +
>  config HAS_CACHE
>  	bool
>  	help
> @@ -184,6 +187,11 @@ config NVVAR
>  	  while global variables can be changed during runtime without changing the
>  	  default.
>  
> +config SECURE_BOOT_TIMEOUT
> +	prompt "Secure Boot unsigned boot timeout"
> +	int
> +	default 3
> +
>  menu "memory layout"
>  
>  source "pbl/Kconfig"
> diff --git a/common/Makefile b/common/Makefile
> index 5f58c81d2..e57cc2c15 100644
> --- a/common/Makefile
> +++ b/common/Makefile
> @@ -61,6 +61,7 @@ obj-$(CONFIG_UBIFORMAT)		+= ubiformat.o
>  obj-$(CONFIG_BAREBOX_UPDATE_IMX_NAND_FCB) += imx-bbu-nand-fcb.o
>  obj-$(CONFIG_CONSOLE_RATP)	+= ratp.o
>  obj-$(CONFIG_BOOT)		+= boot.o
> +obj-$(CONFIG_HAS_SECURE_BOOT)	+= secure_boot.o
>  
>  quiet_cmd_pwd_h = PWDH    $@
>  ifdef CONFIG_PASSWORD
> diff --git a/common/bootm.c b/common/bootm.c
> index 81625d915..0ebf65681 100644
> --- a/common/bootm.c
> +++ b/common/bootm.c
> @@ -23,6 +23,7 @@
>  #include <environment.h>
>  #include <linux/stat.h>
>  #include <magicvar.h>
> +#include <secure_boot.h>
>  
>  static LIST_HEAD(handler_list);
>  
> @@ -625,6 +626,12 @@ int bootm_boot(struct bootm_data *bootm_data)
>  		printf("Passing control to %s handler\n", handler->name);
>  	}
>  
> +	if (!handler->is_secure_supported && is_secure_mode()) {
> +		ret = secure_boot_start_unsigned();
> +		if (ret)
> +			goto err_out;
> +	}

We already have CONFIG_BOOTM_FORCE_SIGNED_IMAGES which admittedly is not
the most generic implementation, but in the end we shouldn't have two
different ways how secure boot is integrated in the bootm code.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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