[U-Boot] [PATCH v5 03/14] fsl: ls-ch3: Add new header for Secure Boot

Saksham Jain
2016-03-23T10:54:34Z

For Secure Boot, a header is used to identify key table, signature and
image address. For Ls-Ch3, there is a new header structure being used.

Currently Key extension (IE) feature is not supported. Single Key
feature is not supported. Keys must be in table format. Hence, SRK (Key
table) is by default currently always present. Max Key number has
increase from 4 to 8. 8th Key is irrevocable. A New Barker Code is being
used.

Signed-off-by: Aneesh Bansal <aneesh.bansal@nxp.com>
Signed-off-by: Saksham Jain <saksham.jain@nxp.com>
---
Changes for v2:
- No changes
Changes for v3:
- No changes
Changes for v4:
- Cleaned up commit message
Changes for v5:
- Cleaned up commit message

arch/arm/include/asm/arch-fsl-layerscape/config.h | 3 +-
arch/arm/include/asm/fsl_secure_boot.h | 4 ++
board/freescale/common/fsl_validate.c | 35 +++++++++++--
include/fsl_secboot_err.h | 3 ++
include/fsl_validate.h | 60 ++++++++++++++++++++---
5 files changed, 91 insertions(+), 14 deletions(-)

diff --git a/arch/arm/include/asm/arch-fsl-layerscape/config.h b/arch/arm/include/asm/arch-fsl-layerscape/config.h
index 34851a9..0445dbd 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/config.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/config.h
@@ -79,7 +79,8 @@
/* Security Monitor */
#define CONFIG_SYS_FSL_SEC_MON_LE

-
+/* Secure Boot */
+#define CONFIG_ESBC_HDR_LS

/* Cache Coherent Interconnect */
#define CCI_MN_BASE 0x04000000
diff --git a/arch/arm/include/asm/fsl_secure_boot.h b/arch/arm/include/asm/fsl_secure_boot.h
index a32a1d7..4eb3b15 100644
--- a/arch/arm/include/asm/fsl_secure_boot.h
+++ b/arch/arm/include/asm/fsl_secure_boot.h
@@ -35,9 +35,13 @@
* The feature is only applicable in case of NOR boot and is
* not applicable in case of RAMBOOT (NAND, SD, SPI).
*/
+#ifndef CONFIG_ESBC_HDR_LS
+/* Current Key EXT feature not available in LS ESBC Header */
#define CONFIG_FSL_ISBC_KEY_EXT
#endif

+#endif
+
#ifdef CONFIG_LS1043A
/* For LS1043 (ARMv8), ESBC image Address in Header is 64 bit */
#define CONFIG_ESBC_ADDR_64BIT
diff --git a/board/freescale/common/fsl_validate.c b/board/freescale/common/fsl_validate.c
index 8fd6dd6..c12b9c9 100644
--- a/board/freescale/common/fsl_validate.c
+++ b/board/freescale/common/fsl_validate.c
@@ -35,7 +35,13 @@ static const u8 hash_identifier[] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
};

static u8 hash_val[SHA256_BYTES];
+
+#ifdef CONFIG_ESBC_HDR_LS
+/* New Barker Code for LS ESBC Header */
+static const u8 barker_code[ESBC_BARKER_LEN] = { 0x12, 0x19, 0x20, 0x01 };
+#else
static const u8 barker_code[ESBC_BARKER_LEN] = { 0x68, 0x39, 0x27, 0x81 };
+#endif

void branch_to_self(void) __attribute__ ((noreturn));

@@ -157,10 +163,15 @@ static int get_ie_info_addr(u32 *ie_addr)
/* This function checks srk_table_flag in header and set/reset srk_flag.*/
static u32 check_srk(struct fsl_secboot_img_priv *img)
{
+#ifdef CONFIG_ESBC_HDR_LS
+ /* In LS, No SRK Flag as SRK is always present*/
+ return 1;
+#else
if (img->hdr.len_kr.srk_table_flag & SRK_FLAG)
return 1;

return 0;
+#endif
}

/* This function returns ospr's key_revoc values.*/
@@ -223,6 +234,7 @@ static u32 read_validate_srk_tbl(struct fsl_secboot_img_priv *img)
}
#endif

+#ifndef CONFIG_ESBC_HDR_LS
static u32 read_validate_single_key(struct fsl_secboot_img_priv *img)
{
struct fsl_secboot_img_hdr *hdr = &img->hdr;
@@ -238,6 +250,7 @@ static u32 read_validate_single_key(struct fsl_secboot_img_priv *img)

return 0;
}
+#endif /* CONFIG_ESBC_HDR_LS */

#if defined(CONFIG_FSL_ISBC_KEY_EXT)
static u32 read_validate_ie_tbl(struct fsl_secboot_img_priv *img)
@@ -388,6 +401,7 @@ void fsl_secboot_handle_error(int error)
case ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD:
case ERROR_ESBC_CLIENT_HEADER_SG_ESBC_EP:
case ERROR_ESBC_CLIENT_HEADER_SG_ENTIRES_BAD:
+ case ERROR_KEY_TABLE_NOT_FOUND:
#ifdef CONFIG_KEY_REVOCATION
case ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED:
case ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY:
@@ -536,11 +550,18 @@ static int calc_esbchdr_esbc_hash(struct fsl_secboot_img_priv *img)
if (!key_hash && check_ie(img))
key_hash = 1;
#endif
- if (!key_hash)
+#ifndef CONFIG_ESBC_HDR_LS
+/* No single key support in LS ESBC header */
+ if (!key_hash) {
ret = algo->hash_update(algo, ctx,
img->img_key, img->hdr.key_len, 0);
+ key_hash = 1;
+ }
+#endif
if (ret)
return ret;
+ if (!key_hash)
+ return ERROR_KEY_TABLE_NOT_FOUND;

/* Update hash for actual Image */
ret = algo->hash_update(algo, ctx,
@@ -626,8 +647,6 @@ static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
u8 *k, *s;
u32 ret = 0;

-#ifdef CONFIG_KEY_REVOCATION
-#endif
int key_found = 0;

/* check barker code */
@@ -671,13 +690,17 @@ static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
key_found = 1;
}
#endif
-
+#ifndef CONFIG_ESBC_HDR_LS
+/* Single Key Feature not available in LS ESBC Header */
if (key_found == 0) {
ret = read_validate_single_key(img);
if (ret != 0)
return ret;
key_found = 1;
}
+#endif
+ if (!key_found)
+ return ERROR_KEY_TABLE_NOT_FOUND;

/* check signaure */
if (get_key_len(img) == 2 * hdr->sign_len) {
@@ -691,10 +714,12 @@ static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
}

memcpy(&img->img_sign, esbc + hdr->psign, hdr->sign_len);
-
+/* No SG support in LS-CH3 */
+#ifndef CONFIG_ESBC_HDR_LS
/* No SG support */
if (hdr->sg_flag)
return ERROR_ESBC_CLIENT_HEADER_SG;
+#endif

/* modulus most significant bit should be set */
k = (u8 *)&img->img_key;
diff --git a/include/fsl_secboot_err.h b/include/fsl_secboot_err.h
index afc50a8..95d890b 100644
--- a/include/fsl_secboot_err.h
+++ b/include/fsl_secboot_err.h
@@ -29,6 +29,7 @@
#define ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN 0x18
#define ERROR_IE_TABLE_NOT_FOUND 0x19
#define ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN 0x20
+#define ERROR_KEY_TABLE_NOT_FOUND 0x21
#define ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1 0x40
#define ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2 0x80
#define ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD 0x100
@@ -121,6 +122,8 @@ static const struct fsl_secboot_errcode fsl_secboot_errcodes[] = {
"Wrong IE public key len in header" },
{ ERROR_IE_TABLE_NOT_FOUND,
"Information about IE Table missing" },
+ { ERROR_KEY_TABLE_NOT_FOUND,
+ "No Key/ Key Table Found in header"},
{ ERROR_ESBC_CLIENT_MAX, "NULL" }
};

diff --git a/include/fsl_validate.h b/include/fsl_validate.h
index 83efcf4..f812c1a 100644
--- a/include/fsl_validate.h
+++ b/include/fsl_validate.h
@@ -21,14 +21,6 @@

extern struct jobring jr;

-#ifdef CONFIG_KEY_REVOCATION
-/* Srk table and key revocation check */
-#define SRK_FLAG 0x01
-#define UNREVOCABLE_KEY 4
-#define ALIGN_REVOC_KEY 3
-#define MAX_KEY_ENTRIES 4
-#endif
-
/* Barker code size in bytes */
#define ESBC_BARKER_LEN 4 /* barker code length in ESBC uboot client */
/* header */
@@ -39,6 +31,47 @@ extern struct jobring jr;
/* Maximum number of SG entries allowed */
#define MAX_SG_ENTRIES 8

+/* Different Header Struct for LS-CH3 */
+#ifdef CONFIG_ESBC_HDR_LS
+struct fsl_secboot_img_hdr {
+ u8 barker[ESBC_BARKER_LEN]; /* barker code */
+ u32 srk_tbl_off;
+ struct {
+ u8 num_srk;
+ u8 srk_sel;
+ u8 reserve;
+ u8 ie_flag;
+ } len_kr;
+
+ u32 uid_flag;
+
+ u32 psign; /* signature offset */
+ u32 sign_len; /* length of the signature in bytes */
+
+ u64 pimg64; /* 64 bit pointer to ESBC Image */
+ u32 img_size; /* ESBC client image size in bytes */
+ u32 ie_key_sel;
+
+ u32 fsl_uid_0;
+ u32 fsl_uid_1;
+ u32 oem_uid_0;
+ u32 oem_uid_1;
+ u32 oem_uid_2;
+ u32 oem_uid_3;
+ u32 oem_uid_4;
+ u32 reserved1[3];
+};
+
+#ifdef CONFIG_KEY_REVOCATION
+/* Srk table and key revocation check */
+#define UNREVOCABLE_KEY 8
+#define ALIGN_REVOC_KEY 7
+#define MAX_KEY_ENTRIES 8
+#endif
+
+
+#else /* CONFIG_ESBC_HDR_LS */
+
/*
* ESBC uboot client header structure.
* The struct contain the following fields
@@ -109,6 +142,17 @@ struct fsl_secboot_img_hdr {
u32 ie_key_sel;
};

+#ifdef CONFIG_KEY_REVOCATION
+/* Srk table and key revocation check */
+#define SRK_FLAG 0x01
+#define UNREVOCABLE_KEY 4
+#define ALIGN_REVOC_KEY 3
+#define MAX_KEY_ENTRIES 4
+#endif
+
+#endif /* CONFIG_ESBC_HDR_LS */
+
+
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
struct ie_key_table {
u32 key_len;
--
1.8.1.4