[U-Boot] [PATCH v4 1/2] powerpc/mpc85xx: SECURE BOOT- Enable chain of trust in SPL

Andreas Dannenberg dannenberg at ti.com
Thu Jun 9 17:05:24 CEST 2016


Hi Sumit,

On Thu, Jun 02, 2016 at 08:16:37AM -0400, Sumit Garg wrote:
> As part of Chain of Trust for Secure boot, the SPL U-Boot will validate
> the next level U-boot image. Add a new function spl_validate_uboot to
> perform the validation.
 
I noticed your patch series just now and I certainly don't want to
derail what you are trying to do here but I wanted to see what you think
about something that's pretty much related.

In order to be more flexible in how we go from SPL to U-Boot (we have a
need to inject ROM-API calls for decryption in addition to
authentication) I've been experimenting with a method that basically
injects a generic post-process function call into spl_load_simple_fit()
that the platform-specific layer can provide/override. This function
will basically get invoked on the U-Boot firmware itself as well as for
the selected DTB after it gets loaded, allowing to do things like custom
authentication and/or decryption through plugging in for example our ROM
API calls. But this should also be a starting point for someone to plug
in the U-Boot RSA libraries directly in a way that doesn't require using
CONFIG_SPL_DM (for memory-constrained devices).

So mostly I wanted to see if this is something that could be useful for
you as well, and any comments/concerns you may have on that.

Thanks and Regards,

--
Andreas Dannenberg
Texas Instruments Inc


> Enable hardware crypto operations in SPL using SEC block.
> In case of Secure Boot, PAMU is not bypassed. For allowing SEC block
> access to CPC configured as SRAM, configure PAMU.
> 
> Reviewed-by: Ruchika Gupta <ruchika.gupta at nxp.com>
> Signed-off-by: Aneesh Bansal <aneesh.bansal at nxp.com>
> Signed-off-by: Sumit Garg <sumit.garg at nxp.com>
> ---
> Changes in v2:
> Patches rebased
> 
> Changes in v3:
> Patches rebased
> 
> Changes in v4:
> Generic changes in lib, drivers, common Makefiles removed from
> this patchset. Rebased this patchset on top of patch [1], so this
> patchset is dependent on patch [1].
> 
> [1]https://patchwork.ozlabs.org/patch/627664/
> 
>  arch/powerpc/cpu/mpc8xxx/fsl_pamu.c         |  8 +++++
>  arch/powerpc/cpu/mpc8xxx/pamu_table.c       |  8 +++++
>  arch/powerpc/include/asm/fsl_secure_boot.h  | 28 ++++++++++++++++
>  board/freescale/common/fsl_chain_of_trust.c | 50 +++++++++++++++++++++++++++++
>  drivers/crypto/fsl/jr.c                     | 16 +++++++++
>  drivers/mtd/nand/fsl_ifc_spl.c              | 24 ++++++++++++++
>  include/fsl_validate.h                      |  1 +
>  7 files changed, 135 insertions(+)
> 
> diff --git a/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c b/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c
> index 9421f1e..ede8e66 100644
> --- a/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c
> +++ b/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c
> @@ -239,15 +239,23 @@ int pamu_init(void)
>  	spaact_size = sizeof(struct paace) * NUM_SPAACT_ENTRIES;
>  
>  	/* Allocate space for Primary PAACT Table */
> +#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_PPAACT_ADDR))
> +	ppaact = (void *)CONFIG_SPL_PPAACT_ADDR;
> +#else
>  	ppaact = memalign(PAMU_TABLE_ALIGNMENT, ppaact_size);
>  	if (!ppaact)
>  		return -1;
> +#endif
>  	memset(ppaact, 0, ppaact_size);
>  
>  	/* Allocate space for Secondary PAACT Table */
> +#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_SPAACT_ADDR))
> +	sec = (void *)CONFIG_SPL_SPAACT_ADDR;
> +#else
>  	sec = memalign(PAMU_TABLE_ALIGNMENT, spaact_size);
>  	if (!sec)
>  		return -1;
> +#endif
>  	memset(sec, 0, spaact_size);
>  
>  	ppaact_phys = virt_to_phys((void *)ppaact);
> diff --git a/arch/powerpc/cpu/mpc8xxx/pamu_table.c b/arch/powerpc/cpu/mpc8xxx/pamu_table.c
> index 26c5ea4..a8e6f51 100644
> --- a/arch/powerpc/cpu/mpc8xxx/pamu_table.c
> +++ b/arch/powerpc/cpu/mpc8xxx/pamu_table.c
> @@ -28,6 +28,14 @@ void construct_pamu_addr_table(struct pamu_addr_tbl *tbl, int *num_entries)
>  
>  	i++;
>  #endif
> +#if (defined(CONFIG_SPL_BUILD) && (CONFIG_SYS_INIT_L3_VADDR))
> +	tbl->start_addr[i] =
> +		(uint64_t)virt_to_phys((void *)CONFIG_SYS_INIT_L3_VADDR);
> +	tbl->size[i] = 256 * 1024; /* 256K CPC flash */
> +	tbl->end_addr[i] = tbl->start_addr[i] +  tbl->size[i] - 1;
> +
> +	i++;
> +#endif
>  	debug("PAMU address\t\t\tsize\n");
>  	for (j = 0; j < i ; j++)
>  		debug("%llx \t\t\t%llx\n",  tbl->start_addr[j],  tbl->size[j]);
> diff --git a/arch/powerpc/include/asm/fsl_secure_boot.h b/arch/powerpc/include/asm/fsl_secure_boot.h
> index 826f9c9..99eec7f 100644
> --- a/arch/powerpc/include/asm/fsl_secure_boot.h
> +++ b/arch/powerpc/include/asm/fsl_secure_boot.h
> @@ -72,6 +72,32 @@
>  
>  #ifdef CONFIG_CHAIN_OF_TRUST
>  
> +#ifdef CONFIG_SPL_BUILD
> +#define CONFIG_SPL_DM			1
> +#define CONFIG_SPL_CRYPTO_SUPPORT
> +#define CONFIG_SPL_HASH_SUPPORT
> +#define CONFIG_SPL_RSA
> +#define CONFIG_SPL_DRIVERS_MISC_SUPPORT
> +/*
> + * PPAACT and SPAACT table for PAMU must be placed on DDR after DDR init
> + * due to space crunch on CPC and thus malloc will not work.
> + */
> +#define CONFIG_SPL_PPAACT_ADDR		0x2e000000
> +#define CONFIG_SPL_SPAACT_ADDR		0x2f000000
> +#define CONFIG_SPL_JR0_LIODN_S		454
> +#define CONFIG_SPL_JR0_LIODN_NS		458
> +/*
> + * Define the key hash for U-Boot here if public/private key pair used to
> + * sign U-boot are different from the SRK hash put in the fuse
> + * Example of defining KEY_HASH is
> + * #define CONFIG_SPL_UBOOT_KEY_HASH \
> + *      "41066b564c6ffcef40ccbc1e0a5d0d519604000c785d97bbefd25e4d288d1c8b"
> + * else leave it defined as NULL
> + */
> +
> +#define CONFIG_SPL_UBOOT_KEY_HASH	NULL
> +#endif /* ifdef CONFIG_SPL_BUILD */
> +
>  #define CONFIG_CMD_ESBC_VALIDATE
>  #define CONFIG_CMD_BLOB
>  #define CONFIG_FSL_SEC_MON
> @@ -82,6 +108,7 @@
>  #define CONFIG_FSL_CAAM
>  #endif
>  
> +#ifndef CONFIG_SPL_BUILD
>  /* fsl_setenv_chain_of_trust() must be called from
>   * board_late_init()
>   */
> @@ -119,5 +146,6 @@
>  #endif /* #ifdef CONFIG_BOOTSCRIPT_COPY_RAM */
>  
>  #include <config_fsl_chain_trust.h>
> +#endif /* #ifndef CONFIG_SPL_BUILD */
>  #endif /* #ifdef CONFIG_CHAIN_OF_TRUST */
>  #endif
> diff --git a/board/freescale/common/fsl_chain_of_trust.c b/board/freescale/common/fsl_chain_of_trust.c
> index ecfcc82..992babf 100644
> --- a/board/freescale/common/fsl_chain_of_trust.c
> +++ b/board/freescale/common/fsl_chain_of_trust.c
> @@ -6,7 +6,17 @@
>  
>  #include <common.h>
>  #include <fsl_validate.h>
> +#include <fsl_secboot_err.h>
>  #include <fsl_sfp.h>
> +#include <dm/root.h>
> +
> +#ifdef CONFIG_ADDR_MAP
> +#include <asm/mmu.h>
> +#endif
> +
> +#ifdef CONFIG_FSL_CORENET
> +#include <asm/fsl_pamu.h>
> +#endif
>  
>  #ifdef CONFIG_LS102XA
>  #include <asm/arch/immap_ls102xa.h>
> @@ -52,6 +62,7 @@ int fsl_check_boot_mode_secure(void)
>  	return 0;
>  }
>  
> +#ifndef CONFIG_SPL_BUILD
>  int fsl_setenv_chain_of_trust(void)
>  {
>  	/* Check Boot Mode
> @@ -68,3 +79,42 @@ int fsl_setenv_chain_of_trust(void)
>  	setenv("bootcmd", CONFIG_CHAIN_BOOT_CMD);
>  	return 0;
>  }
> +#endif
> +
> +#ifdef CONFIG_SPL_BUILD
> +void spl_validate_uboot(uint32_t hdr_addr, uintptr_t img_addr)
> +{
> +	int res;
> +
> +	/* Check Boot Mode
> +	 * If Boot Mode is Non-Secure, skip validation
> +	 */
> +	if (fsl_check_boot_mode_secure() == 0)
> +		return;
> +
> +	printf("SPL: Validating U-Boot image\n");
> +
> +#ifdef CONFIG_ADDR_MAP
> +	init_addr_map();
> +#endif
> +
> +#ifdef CONFIG_FSL_CORENET
> +	if (pamu_init() < 0)
> +		fsl_secboot_handle_error(ERROR_ESBC_PAMU_INIT);
> +#endif
> +
> +#ifdef CONFIG_FSL_CAAM
> +	if (sec_init() < 0)
> +		fsl_secboot_handle_error(ERROR_ESBC_SEC_INIT);
> +#endif
> +
> +#if defined(CONFIG_DM)
> +	dm_init_and_scan(false);
> +#endif
> +	res = fsl_secboot_validate(hdr_addr, CONFIG_SPL_UBOOT_KEY_HASH,
> +				   &img_addr);
> +
> +	if (res == 0)
> +		printf("SPL: Validation of U-boot successful\n");
> +}
> +#endif
> diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c
> index 510fa4e..1d4dd32 100644
> --- a/drivers/crypto/fsl/jr.c
> +++ b/drivers/crypto/fsl/jr.c
> @@ -599,10 +599,26 @@ int sec_init_idx(uint8_t sec_idx)
>  	sec_out32(&sec->mcfgr, mcr);
>  
>  #ifdef CONFIG_FSL_CORENET
> +#ifdef CONFIG_SPL_BUILD
> +	/* For SPL Build, Set the Liodns in SEC JR0 for
> +	 * creating PAMU entries corresponding to these.
> +	 * For normal build, these are set in set_liodns().
> +	 */
> +	liodn_ns = CONFIG_SPL_JR0_LIODN_NS & JRNSLIODN_MASK;
> +	liodn_s = CONFIG_SPL_JR0_LIODN_S & JRSLIODN_MASK;
> +
> +	liodnr = sec_in32(&sec->jrliodnr[0].ls) &
> +		 ~(JRNSLIODN_MASK | JRSLIODN_MASK);
> +	liodnr = liodnr |
> +		 (liodn_ns << JRNSLIODN_SHIFT) |
> +		 (liodn_s << JRSLIODN_SHIFT);
> +	sec_out32(&sec->jrliodnr[0].ls, liodnr);
> +#else
>  	liodnr = sec_in32(&sec->jrliodnr[0].ls);
>  	liodn_ns = (liodnr & JRNSLIODN_MASK) >> JRNSLIODN_SHIFT;
>  	liodn_s = (liodnr & JRSLIODN_MASK) >> JRSLIODN_SHIFT;
>  #endif
> +#endif
>  
>  	ret = jr_init(sec_idx);
>  	if (ret < 0) {
> diff --git a/drivers/mtd/nand/fsl_ifc_spl.c b/drivers/mtd/nand/fsl_ifc_spl.c
> index cbeb74a..30aa966 100644
> --- a/drivers/mtd/nand/fsl_ifc_spl.c
> +++ b/drivers/mtd/nand/fsl_ifc_spl.c
> @@ -11,6 +11,9 @@
>  #include <asm/io.h>
>  #include <fsl_ifc.h>
>  #include <linux/mtd/nand.h>
> +#ifdef CONFIG_CHAIN_OF_TRUST
> +#include <fsl_validate.h>
> +#endif
>  
>  static inline int is_blank(uchar *addr, int page_size)
>  {
> @@ -268,6 +271,27 @@ void nand_boot(void)
>  	 */
>  	flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
>  #endif
> +
> +#ifdef CONFIG_CHAIN_OF_TRUST
> +	/*
> +	 * As U-Boot header is appended at end of U-boot image, so
> +	 * calculate U-boot header address using U-boot header size.
> +	 */
> +#define CONFIG_U_BOOT_HDR_ADDR \
> +		((CONFIG_SYS_NAND_U_BOOT_START + \
> +		  CONFIG_SYS_NAND_U_BOOT_SIZE) - \
> +		 CONFIG_U_BOOT_HDR_SIZE)
> +	spl_validate_uboot(CONFIG_U_BOOT_HDR_ADDR,
> +			   CONFIG_SYS_NAND_U_BOOT_START);
> +	/*
> +	 * In case of failure in validation, spl_validate_uboot would
> +	 * not return back in case of Production environment with ITS=1.
> +	 * Thus U-Boot will not start.
> +	 * In Development environment (ITS=0 and SB_EN=1), the function
> +	 * may return back in case of non-fatal failures.
> +	 */
> +#endif
> +
>  	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
>  	uboot();
>  }
> diff --git a/include/fsl_validate.h b/include/fsl_validate.h
> index a71e1ce..7695b30 100644
> --- a/include/fsl_validate.h
> +++ b/include/fsl_validate.h
> @@ -254,4 +254,5 @@ int fsl_secboot_blob_decap(cmd_tbl_t *cmdtp, int flag, int argc,
>  
>  int fsl_check_boot_mode_secure(void);
>  int fsl_setenv_chain_of_trust(void);
> +void spl_validate_uboot(uint32_t hdr_addr, uintptr_t img_addr);
>  #endif
> -- 
> 1.8.1.4
> 


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