[U-Boot] [PATCH 1/3] imx8: Add AHAB secure boot support
Peng Fan
peng.fan at nxp.com
Wed Sep 25 08:11:14 UTC 2019
Add function and new command "auth_cntr" for secure boot support.
When booting with life cycle set to OEM closed, we need to use
this function to authenticate the OS container and load kernel & FDT
from OS container to their destination.
Also add image authentication call when loading container images.
Users can set CONFIG_AHAB_BOOT=y to enable the feature. It is not
set at default.
Signed-off-by: Ye Li <ye.li at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
arch/arm/mach-imx/imx8/Kconfig | 5 +
arch/arm/mach-imx/imx8/ahab.c | 347 +++++++++++++++++++++++++++++++
arch/arm/mach-imx/imx8/parse-container.c | 95 ++++++++-
3 files changed, 443 insertions(+), 4 deletions(-)
create mode 100644 arch/arm/mach-imx/imx8/ahab.c
diff --git a/arch/arm/mach-imx/imx8/Kconfig b/arch/arm/mach-imx/imx8/Kconfig
index d17760e333..36c2e5224c 100644
--- a/arch/arm/mach-imx/imx8/Kconfig
+++ b/arch/arm/mach-imx/imx8/Kconfig
@@ -1,5 +1,10 @@
if ARCH_IMX8
+config AHAB_BOOT
+ bool "Support i.MX8 AHAB features"
+ help
+ This option enables the support for AHAB secure boot.
+
config IMX8
bool
diff --git a/arch/arm/mach-imx/imx8/ahab.c b/arch/arm/mach-imx/imx8/ahab.c
new file mode 100644
index 0000000000..cf3c7d762a
--- /dev/null
+++ b/arch/arm/mach-imx/imx8/ahab.c
@@ -0,0 +1,347 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2019 NXP
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/arch/sci/sci.h>
+#include <asm/mach-imx/sys_proto.h>
+#include <asm/arch-imx/cpu.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/image.h>
+#include <console.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define SEC_SECURE_RAM_BASE (0x31800000UL)
+#define SEC_SECURE_RAM_END_BASE (SEC_SECURE_RAM_BASE + 0xFFFFUL)
+#define SECO_LOCAL_SEC_SEC_SECURE_RAM_BASE (0x60000000UL)
+
+#define SECO_PT 2U
+
+static inline bool check_in_dram(ulong addr)
+{
+ int i;
+ bd_t *bd = gd->bd;
+
+ for (i = 0; i < CONFIG_NR_DRAM_BANKS; ++i) {
+ if (bd->bi_dram[i].size) {
+ if (addr >= bd->bi_dram[i].start &&
+ addr < (bd->bi_dram[i].start + bd->bi_dram[i].size))
+ return true;
+ }
+ }
+
+ return false;
+}
+
+int authenticate_os_container(ulong addr)
+{
+ struct container_hdr *phdr;
+ int i, ret = 0;
+ int err;
+ sc_rm_mr_t mr;
+ sc_faddr_t start, end;
+ u16 length;
+ struct boot_img_t *img;
+ unsigned long s, e;
+
+ if (addr % 4) {
+ puts("Error: Image's address is not 4 byte aligned\n");
+ return -EINVAL;
+ }
+
+ if (!check_in_dram(addr)) {
+ puts("Error: Image's address is invalid\n");
+ return -EINVAL;
+ }
+
+ phdr = (struct container_hdr *)addr;
+ if (phdr->tag != 0x87 && phdr->version != 0x0) {
+ printf("Error: Wrong container header\n");
+ return -EFAULT;
+ }
+
+ if (!phdr->num_images) {
+ printf("Error: Wrong container, no image found\n");
+ return -EFAULT;
+ }
+
+ length = phdr->length_lsb + (phdr->length_msb << 8);
+
+ debug("container length %u\n", length);
+ memcpy((void *)SEC_SECURE_RAM_BASE, (const void *)addr,
+ ALIGN(length, CONFIG_SYS_CACHELINE_SIZE));
+
+ err = sc_seco_authenticate(-1, SC_MISC_AUTH_CONTAINER,
+ SECO_LOCAL_SEC_SEC_SECURE_RAM_BASE);
+ if (err) {
+ printf("Authenticate container hdr failed, return %d\n",
+ err);
+ ret = -EIO;
+ goto exit;
+ }
+
+ /* Copy images to dest address */
+ for (i = 0; i < phdr->num_images; i++) {
+ img = (struct boot_img_t *)(addr +
+ sizeof(struct container_hdr) +
+ i * sizeof(struct boot_img_t));
+
+ debug("img %d, dst 0x%llx, src 0x%lx, size 0x%x\n",
+ i, img->dst, img->offset + addr, img->size);
+
+ memcpy((void *)img->dst, (const void *)(img->offset + addr),
+ img->size);
+
+ s = img->dst & ~(CONFIG_SYS_CACHELINE_SIZE - 1);
+ e = ALIGN(img->dst + img->size, CONFIG_SYS_CACHELINE_SIZE);
+
+ flush_dcache_range(s, e);
+
+ /* Find the memreg and set permission for seco pt */
+ err = sc_rm_find_memreg(-1, &mr, s, e);
+ if (err) {
+ printf("Not found memreg for image: %d, error %d\n",
+ i, err);
+ ret = -ENOMEM;
+ goto exit;
+ }
+
+ err = sc_rm_get_memreg_info(-1, mr, &start, &end);
+ if (!err)
+ debug("memreg %u 0x%llx -- 0x%llx\n", mr, start, end);
+
+ err = sc_rm_set_memreg_permissions(-1, mr, SECO_PT,
+ SC_RM_PERM_FULL);
+ if (err) {
+ printf("Set permission failed for img %d, error %d\n",
+ i, err);
+ ret = -EPERM;
+ goto exit;
+ }
+
+ err = sc_seco_authenticate(-1, SC_MISC_VERIFY_IMAGE,
+ (1 << i));
+ if (err) {
+ printf("Authenticate img %d failed, return %d\n",
+ i, err);
+ ret = -EIO;
+ }
+
+ err = sc_rm_set_memreg_permissions(-1, mr, SECO_PT,
+ SC_RM_PERM_NONE);
+ if (err) {
+ printf("Remove permission failed for img %d, err %d\n",
+ i, err);
+ ret = -EPERM;
+ }
+
+ if (ret)
+ goto exit;
+ }
+
+exit:
+ if (sc_seco_authenticate(-1, SC_MISC_REL_CONTAINER, 0) != SC_ERR_NONE)
+ printf("Error: release container failed!\n");
+
+ return ret;
+}
+
+static int do_authenticate(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ ulong addr;
+
+ if (argc < 2)
+ return CMD_RET_USAGE;
+
+ addr = simple_strtoul(argv[1], NULL, 16);
+
+ printf("Authenticate OS container at 0x%lx\n", addr);
+
+ if (authenticate_os_container(addr))
+ return CMD_RET_FAILURE;
+
+ return CMD_RET_SUCCESS;
+}
+
+static void display_life_cycle(u16 lc)
+{
+ printf("Lifecycle: 0x%04X, ", lc);
+ switch (lc) {
+ case 0x1:
+ printf("Pristine\n\n");
+ break;
+ case 0x2:
+ printf("Fab\n\n");
+ break;
+ case 0x8:
+ printf("Open\n\n");
+ break;
+ case 0x20:
+ printf("NXP closed\n\n");
+ break;
+ case 0x80:
+ printf("OEM closed\n\n");
+ break;
+ case 0x100:
+ printf("Partial field return\n\n");
+ break;
+ case 0x200:
+ printf("Full field return\n\n");
+ break;
+ case 0x400:
+ printf("No return\n\n");
+ break;
+ default:
+ printf("Unknown\n\n");
+ break;
+ }
+}
+
+#define AHAB_AUTH_CONTAINER_REQ 0x87
+#define AHAB_VERIFY_IMAGE_REQ 0x88
+
+#define AHAB_NO_AUTHENTICATION_IND 0xee
+#define AHAB_BAD_KEY_HASH_IND 0xfa
+#define AHAB_INVALID_KEY_IND 0xf9
+#define AHAB_BAD_SIGNATURE_IND 0xf0
+#define AHAB_BAD_HASH_IND 0xf1
+
+static void display_ahab_auth_event(u32 event)
+{
+ u8 cmd = (event >> 16) & 0xff;
+ u8 resp_ind = (event >> 8) & 0xff;
+
+ switch (cmd) {
+ case AHAB_AUTH_CONTAINER_REQ:
+ printf("\tCMD = AHAB_AUTH_CONTAINER_REQ (0x%02X)\n", cmd);
+ printf("\tIND = ");
+ break;
+ case AHAB_VERIFY_IMAGE_REQ:
+ printf("\tCMD = AHAB_VERIFY_IMAGE_REQ (0x%02X)\n", cmd);
+ printf("\tIND = ");
+ break;
+ default:
+ return;
+ }
+
+ switch (resp_ind) {
+ case AHAB_NO_AUTHENTICATION_IND:
+ printf("AHAB_NO_AUTHENTICATION_IND (0x%02X)\n\n", resp_ind);
+ break;
+ case AHAB_BAD_KEY_HASH_IND:
+ printf("AHAB_BAD_KEY_HASH_IND (0x%02X)\n\n", resp_ind);
+ break;
+ case AHAB_INVALID_KEY_IND:
+ printf("AHAB_INVALID_KEY_IND (0x%02X)\n\n", resp_ind);
+ break;
+ case AHAB_BAD_SIGNATURE_IND:
+ printf("AHAB_BAD_SIGNATURE_IND (0x%02X)\n\n", resp_ind);
+ break;
+ case AHAB_BAD_HASH_IND:
+ printf("AHAB_BAD_HASH_IND (0x%02X)\n\n", resp_ind);
+ break;
+ default:
+ printf("Unknown Indicator (0x%02X)\n\n", resp_ind);
+ break;
+ }
+}
+
+static int do_ahab_status(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ int err;
+ u8 idx = 0U;
+ u32 event;
+ u16 lc;
+
+ err = sc_seco_chip_info(-1, &lc, NULL, NULL, NULL);
+ if (err != SC_ERR_NONE) {
+ printf("Error in get lifecycle\n");
+ return -EIO;
+ }
+
+ display_life_cycle(lc);
+
+ err = sc_seco_get_event(-1, idx, &event);
+ while (err == SC_ERR_NONE) {
+ printf("SECO Event[%u] = 0x%08X\n", idx, event);
+ display_ahab_auth_event(event);
+
+ idx++;
+ err = sc_seco_get_event(-1, idx, &event);
+ }
+
+ if (idx == 0)
+ printf("No SECO Events Found!\n\n");
+
+ return 0;
+}
+
+static int confirm_close(void)
+{
+ puts("Warning: Please ensure your sample is in NXP closed state, "
+ "OEM SRK hash has been fused, \n"
+ " and you are able to boot a signed image successfully "
+ "without any SECO events reported.\n"
+ " If not, your sample will be unrecoverable.\n"
+ "\nReally perform this operation? <y/N>\n");
+
+ if (confirm_yesno())
+ return 1;
+
+ puts("Ahab close aborted\n");
+ return 0;
+}
+
+static int do_ahab_close(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ int err;
+ u16 lc;
+
+ if (!confirm_close())
+ return -EACCES;
+
+ err = sc_seco_chip_info(-1, &lc, NULL, NULL, NULL);
+ if (err != SC_ERR_NONE) {
+ printf("Error in get lifecycle\n");
+ return -EIO;
+ }
+
+ if (lc != 0x20) {
+ puts("Current lifecycle is NOT NXP closed, can't move to OEM closed\n");
+ display_life_cycle(lc);
+ return -EPERM;
+ }
+
+ err = sc_seco_forward_lifecycle(-1, 16);
+ if (err != SC_ERR_NONE) {
+ printf("Error in forward lifecycle to OEM closed\n");
+ return -EIO;
+ }
+
+ printf("Change to OEM closed successfully\n");
+
+ return 0;
+}
+
+U_BOOT_CMD(auth_cntr, CONFIG_SYS_MAXARGS, 1, do_authenticate,
+ "autenticate OS container via AHAB",
+ "addr\n"
+ "addr - OS container hex address\n"
+);
+
+U_BOOT_CMD(ahab_status, CONFIG_SYS_MAXARGS, 1, do_ahab_status,
+ "display AHAB lifecycle and events from seco",
+ ""
+);
+
+U_BOOT_CMD(ahab_close, CONFIG_SYS_MAXARGS, 1, do_ahab_close,
+ "Change AHAB lifecycle to OEM closed",
+ ""
+);
diff --git a/arch/arm/mach-imx/imx8/parse-container.c b/arch/arm/mach-imx/imx8/parse-container.c
index 32f78bdddf..b57e68e412 100644
--- a/arch/arm/mach-imx/imx8/parse-container.c
+++ b/arch/arm/mach-imx/imx8/parse-container.c
@@ -7,6 +7,67 @@
#include <errno.h>
#include <spl.h>
#include <asm/arch/image.h>
+#include <asm/arch/sci/sci.h>
+
+#define SEC_SECURE_RAM_BASE 0x31800000UL
+#define SEC_SECURE_RAM_END_BASE (SEC_SECURE_RAM_BASE + 0xFFFFUL)
+#define SECO_LOCAL_SEC_SEC_SECURE_RAM_BASE 0x60000000UL
+
+#define SECO_PT 2U
+
+#ifdef CONFIG_AHAB_BOOT
+static int authenticate_image(struct boot_img_t *img, int image_index)
+{
+ sc_faddr_t start, end;
+ sc_rm_mr_t mr;
+ int err;
+ int ret = 0;
+
+ debug("img %d, dst 0x%llx, src 0x%x, size 0x%x\n",
+ image_index, img->dst, img->offset, img->size);
+
+ /* Find the memreg and set permission for seco pt */
+ err = sc_rm_find_memreg(-1, &mr,
+ img->dst & ~(CONFIG_SYS_CACHELINE_SIZE - 1),
+ ALIGN(img->dst + img->size, CONFIG_SYS_CACHELINE_SIZE));
+
+ if (err) {
+ printf("can't find memreg for image: %d, err %d\n",
+ image_index, err);
+ return -ENOMEM;
+ }
+
+ err = sc_rm_get_memreg_info(-1, mr, &start, &end);
+ if (!err)
+ debug("memreg %u 0x%llx -- 0x%llx\n", mr, start, end);
+
+ err = sc_rm_set_memreg_permissions(-1, mr,
+ SECO_PT, SC_RM_PERM_FULL);
+ if (err) {
+ printf("set permission failed for img %d, error %d\n",
+ image_index, err);
+ return -EPERM;
+ }
+
+ err = sc_seco_authenticate(-1, SC_MISC_VERIFY_IMAGE,
+ 1 << image_index);
+ if (err) {
+ printf("authenticate img %d failed, return %d\n",
+ image_index, err);
+ ret = -EIO;
+ }
+
+ err = sc_rm_set_memreg_permissions(-1, mr,
+ SECO_PT, SC_RM_PERM_NONE);
+ if (err) {
+ printf("remove permission failed for img %d, error %d\n",
+ image_index, err);
+ ret = -EPERM;
+ }
+
+ return ret;
+}
+#endif
static struct boot_img_t *read_auth_image(struct spl_image_info *spl_image,
struct spl_load_info *info,
@@ -45,6 +106,13 @@ static struct boot_img_t *read_auth_image(struct spl_image_info *spl_image,
return NULL;
}
+#ifdef CONFIG_AHAB_BOOT
+ if (authenticate_image(&images[image_index], image_index)) {
+ printf("Failed to authenticate image %d\n", image_index);
+ return NULL;
+ }
+#endif
+
return &images[image_index];
}
@@ -54,7 +122,7 @@ static int read_auth_container(struct spl_image_info *spl_image,
struct container_hdr *container = NULL;
u16 length;
u32 sectors;
- int i, size;
+ int i, size, ret = 0;
size = roundup(CONTAINER_HDR_ALIGNMENT, info->bl_len);
sectors = size / info->bl_len;
@@ -96,13 +164,27 @@ static int read_auth_container(struct spl_image_info *spl_image,
return -EIO;
}
+#ifdef CONFIG_AHAB_BOOT
+ memcpy((void *)SEC_SECURE_RAM_BASE, (const void *)container,
+ ALIGN(length, CONFIG_SYS_CACHELINE_SIZE));
+
+ ret = sc_seco_authenticate(-1, SC_MISC_AUTH_CONTAINER,
+ SECO_LOCAL_SEC_SEC_SECURE_RAM_BASE);
+ if (ret) {
+ printf("authenticate container hdr failed, return %d\n", ret);
+ return ret;
+ }
+#endif
+
for (i = 0; i < container->num_images; i++) {
struct boot_img_t *image = read_auth_image(spl_image, info,
container, i,
sector);
- if (!image)
- return -EINVAL;
+ if (!image) {
+ ret = -EINVAL;
+ goto end_auth;
+ }
if (i == 0) {
spl_image->load_addr = image->dst;
@@ -110,7 +192,12 @@ static int read_auth_container(struct spl_image_info *spl_image,
}
}
- return 0;
+end_auth:
+#ifdef CONFIG_AHAB_BOOT
+ if (sc_seco_authenticate(-1, SC_MISC_REL_CONTAINER, 0))
+ printf("Error: release container failed!\n");
+#endif
+ return ret;
}
int spl_load_imx_container(struct spl_image_info *spl_image,
--
2.16.4
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