Re: [PATCH 3/3] bootm: add initial FIT support

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Hi Marc,

thanks for reposting the patches.

On Tue, Jan 5, 2016 at 9:11 AM, Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote:
> From: Jan Luebbe <jlu@xxxxxxxxxxxxxx>
>
> This implementation is inspired by U-Boot's FIT support. Instead of
> using libfdt (which does not exist in barebox), configuration signatures
> are verified by using a simplified DT parser based on barebox's own
> code.
>
> Currently, only signed configurations with hashed images are supported,
> as the other variants are less useful for verified boot. Compatible FIT
> images can be created using U-Boot's mkimage tool.

What about unsigned images?

I also get: unsupported algo crc32

Is it intended to be supported?

> Signed-off-by: Jan Luebbe <jlu@xxxxxxxxxxxxxx>
> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> ---
>  arch/arm/lib/bootm.c |  74 +++++++
>  commands/Kconfig     |   8 +
>  common/Kconfig       |   6 +
>  common/Makefile      |   1 +
>  common/image-fit.c   | 590 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/image-fit.h  |  42 ++++
>  6 files changed, 721 insertions(+)
>  create mode 100644 common/image-fit.c
>  create mode 100644 include/image-fit.h
>
> diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
> index 7bb9b436560c..22c2d6017e7c 100644
> --- a/arch/arm/lib/bootm.c
> +++ b/arch/arm/lib/bootm.c
> @@ -553,6 +553,78 @@ BAREBOX_MAGICVAR(aimage_noverwrite_bootargs, "Disable overwrite of the bootargs
>  BAREBOX_MAGICVAR(aimage_noverwrite_tags, "Disable overwrite of the tags addr with the one present in aimage");
>  #endif
>
> +#include <image-fit.h>
> +
> +static int do_bootm_arm_fit(struct image_data *data)
> +{
> +       struct fit_handle *handle;
> +       int ret;
> +       unsigned long mem_free;
> +       unsigned long mem_start, mem_size;
> +
> +       handle = fit_open(data->os_file, data->os_num, data->verbose);
> +       if (!handle)
> +               return -EINVAL;
> +
> +       ret = sdram_start_and_size(&mem_start, &mem_size);
> +       if (ret)
> +               return ret;
> +
> +       /* no support for custom load address */
> +       data->os_address = mem_start + PAGE_ALIGN(handle->kernel_size * 4);
> +       data->os_res = request_sdram_region("fit-kernel", data->os_address, handle->kernel_size);
> +       if (!data->os_res) {
> +               pr_err("Cannot request region 0x%08lx - 0x%08lx\n",
> +                               data->os_address, handle->kernel_size);
> +               ret = -ENOMEM;
> +               goto err_out;
> +       }
> +       memcpy((void *)data->os_res->start, handle->kernel, handle->kernel_size);
> +
> +       /*
> +        * Put oftree/initrd close behind compressed kernel image to avoid
> +        * placing it outside of the kernels lowmem.
> +        */
> +       if (handle->initrd_size) {
> +               data->initrd_address = PAGE_ALIGN(data->os_res->end + SZ_1M);
> +               data->initrd_res = request_sdram_region("fit-initrd", data->initrd_address, handle->initrd_size);
> +               if (!data->initrd_res) {
> +                       ret = -ENOMEM;
> +                       goto err_out;
> +               }
> +               memcpy((void *)data->initrd_res->start, handle->initrd, handle->initrd_size);
> +       }
> +
> +       data->of_root_node = of_unflatten_dtb(handle->oftree);
> +       if (!data->of_root_node) {
> +               pr_err("unable to unflatten devicetree\n");
> +               ret = -EINVAL;
> +               goto err_out;
> +       }
> +
> +       /*
> +        * Put devicetree right after initrd if present or after the kernel
> +        * if not.
> +        */
> +       if (data->initrd_res)
> +               mem_free = PAGE_ALIGN(data->initrd_res->end);
> +       else
> +               mem_free = PAGE_ALIGN(data->os_res->end + SZ_1M);
> +
> +       return __do_bootm_linux(data, mem_free, 0);
> +
> +err_out:
> +       if (handle)
> +               fit_close(handle);
> +       return ret;
> +}
> +
> +static struct image_handler arm_fit_handler = {
> +        .name = "FIT image",
> +        .bootm = do_bootm_arm_fit,
> +        .filetype = filetype_oftree,
> +};
> +
>  static struct binfmt_hook binfmt_aimage_hook = {
>         .type = filetype_aimage,
>         .exec = "bootm",
> @@ -578,6 +650,8 @@ static int armlinux_register_image_handler(void)
>                 register_image_handler(&aimage_handler);
>                 binfmt_register(&binfmt_aimage_hook);
>         }
> +       if (IS_BUILTIN(CONFIG_CMD_BOOTM_FITIMAGE))
> +               register_image_handler(&arm_fit_handler);
>         binfmt_register(&binfmt_arm_zimage_hook);
>         binfmt_register(&binfmt_barebox_hook);
>
> diff --git a/commands/Kconfig b/commands/Kconfig
> index 1743670ed33c..b89627209f5a 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -418,6 +418,14 @@ config CMD_BOOTM_AIMAGE
>         help
>           Support using Android Images.
>
> +config CMD_BOOTM_FITIMAGE
> +       bool
> +       prompt "FIT image support"
> +       select FITIMAGE
> +       depends on CMD_BOOTM && ARM
> +       help
> +         Support using FIT Images.
> +
>  config CMD_BOOTU
>         tristate
>         default y
> diff --git a/common/Kconfig b/common/Kconfig
> index 8e7950968c3e..d824b5e35f04 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -66,6 +66,12 @@ config UIMAGE
>         select CRC32
>         bool
>
> +config FITIMAGE
> +       bool
> +       select OFTREE
> +       select DIGEST
> +       select CRYPTO_RSA
> +
>  config LOGBUF
>         bool
>
> diff --git a/common/Makefile b/common/Makefile
> index 56e6becec078..ffaf8e7b42eb 100644
> --- a/common/Makefile
> +++ b/common/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_SHELL_HUSH)      += hush.o
>  obj-$(CONFIG_SHELL_SIMPLE)     += parser.o
>  obj-$(CONFIG_STATE)            += state.o
>  obj-$(CONFIG_UIMAGE)           += image.o uimage.o
> +obj-$(CONFIG_FITIMAGE)         += image-fit.o
>  obj-$(CONFIG_MENUTREE)         += menutree.o
>  obj-$(CONFIG_EFI_GUID)         += efi-guid.o
>  obj-$(CONFIG_EFI_DEVICEPATH)   += efi-devicepath.o
> diff --git a/common/image-fit.c b/common/image-fit.c
> new file mode 100644
> index 000000000000..fc95ed4d8118
> --- /dev/null
> +++ b/common/image-fit.c
> @@ -0,0 +1,590 @@
> +/*
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + *
> + * Copyright (C) Jan Lübbe, 2014
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <boot.h>
> +#include <libfile.h>
> +#include <fdt.h>
> +#include <digest.h>
> +#include <of.h>
> +#include <fs.h>
> +#include <malloc.h>
> +#include <linux/ctype.h>
> +#include <asm/byteorder.h>
> +#include <errno.h>
> +#include <linux/err.h>
> +#include <stringlist.h>
> +#include <rsa.h>
> +#include <image-fit.h>
> +
> +#define FDT_MAX_DEPTH 32
> +#define FDT_MAX_PATH_LEN 200
> +
> +#define CHECK_LEVEL_NONE 0
> +#define CHECK_LEVEL_HASH 1
> +#define CHECK_LEVEL_SIG 2
> +#define CHECK_LEVEL_MAX 3
> +
> +static uint32_t dt_struct_advance(struct fdt_header *f, uint32_t dt, int size)
> +{
> +       dt += size;
> +       dt = ALIGN(dt, 4);
> +
> +       if (dt > f->off_dt_struct + f->size_dt_struct)
> +               return 0;
> +
> +       return dt;
> +}
> +
> +static char *dt_string(struct fdt_header *f, char *strstart, uint32_t ofs)
> +{
> +       if (ofs > f->size_dt_strings)
> +               return NULL;
> +       else
> +               return strstart + ofs;
> +}
> +
> +static int of_read_string_list(struct device_node *np, const char *name, struct string_list *sl)
> +{
> +       struct property *prop;
> +       const char *s;
> +
> +       of_property_for_each_string(np, name, prop, s) {
> +               string_list_add(sl, s);
> +       }
> +
> +       return prop ? 0 : -EINVAL;
> +}
> +
> +static int fit_digest(void *fit, struct digest *digest,
> +                     struct string_list *inc_nodes, struct string_list *exc_props,
> +                     uint32_t hashed_strings_start, uint32_t hashed_strings_size)
> +{
> +       struct fdt_header *fdt = fit;
> +       uint32_t dt_struct;
> +       void *dt_strings;
> +       struct fdt_header f;
> +       int stack[FDT_MAX_DEPTH];
> +       char path[FDT_MAX_PATH_LEN];
> +       char *end;
> +       uint32_t tag;
> +       int start = -1;
> +       int depth = -1;
> +       int want = 0;
> +
> +       f.totalsize = fdt32_to_cpu(fdt->totalsize);
> +       f.off_dt_struct = fdt32_to_cpu(fdt->off_dt_struct);
> +       f.size_dt_struct = fdt32_to_cpu(fdt->size_dt_struct);
> +       f.off_dt_strings = fdt32_to_cpu(fdt->off_dt_strings);
> +       f.size_dt_strings = fdt32_to_cpu(fdt->size_dt_strings);
> +
> +       if (hashed_strings_start > f.size_dt_strings ||
> +           hashed_strings_size > f.size_dt_strings ||
> +           hashed_strings_start + hashed_strings_size > f.size_dt_strings) {
> +               pr_err("%s: hashed-strings too large\n", __func__);
> +               return -EINVAL;
> +       }
> +
> +       dt_struct = f.off_dt_struct;
> +       dt_strings = (void *)fdt + f.off_dt_strings;
> +
> +       end = path;
> +       *end = '\0';
> +
> +       do {
> +               const struct fdt_property *fdt_prop;
> +               const struct fdt_node_header *fnh;
> +               const char *name;
> +               int include = 0;
> +               int stop_at = 0;
> +               int offset = dt_struct;
> +               int maxlen, len;
> +
> +               tag = be32_to_cpu(*(uint32_t *)(fit + dt_struct));
> +
> +               switch (tag) {
> +               case FDT_BEGIN_NODE:
> +                       fnh = fit + dt_struct;
> +                       name = fnh->name;
> +                       maxlen = (unsigned long)fdt + f.off_dt_struct +
> +                               f.size_dt_struct - (unsigned long)name;
> +
> +                       len = strnlen(name, maxlen + 1);
> +                       if (len > maxlen)
> +                               return -ESPIPE;
> +
> +                       dt_struct = dt_struct_advance(&f, dt_struct,
> +                                                     sizeof(struct fdt_node_header) + len + 1);
> +
> +                       depth++;
> +                       if (depth == FDT_MAX_DEPTH)
> +                               return -ESPIPE;
> +                       if (end - path + 2 + len >= FDT_MAX_PATH_LEN)
> +                               return -ESPIPE;
> +                       if (end != path + 1)
> +                               *end++ = '/';
> +                       strcpy(end, name);
> +                       end += len;
> +                       stack[depth] = want;
> +                       if (want == 1)
> +                               stop_at = offset;
> +                       if (string_list_contains(inc_nodes, path))
> +                               want = 2;
> +                       else if (want)
> +                               want--;
> +                       else
> +                               stop_at = offset;
> +                       include = want;
> +
> +                       break;
> +
> +               case FDT_END_NODE:
> +                       dt_struct = dt_struct_advance(&f, dt_struct, FDT_TAGSIZE);
> +
> +                       include = want;
> +                       want = stack[depth--];
> +                       while (end > path && *--end != '/')
> +                               ;
> +                       *end = '\0';
> +
> +                       break;
> +
> +               case FDT_PROP:
> +                       fdt_prop = fit + dt_struct;
> +                       len = fdt32_to_cpu(fdt_prop->len);
> +
> +                       name = dt_string(&f, dt_strings, fdt32_to_cpu(fdt_prop->nameoff));
> +                       if (!name)
> +                               return -ESPIPE;
> +
> +                       dt_struct = dt_struct_advance(&f, dt_struct,
> +                                                     sizeof(struct fdt_property) + len);
> +
> +                       include = want >= 2;
> +                       stop_at = offset;
> +                       if (string_list_contains(exc_props, name))
> +                               include = 0;
> +
> +                       break;
> +
> +               case FDT_NOP:
> +                       dt_struct = dt_struct_advance(&f, dt_struct, FDT_TAGSIZE);
> +
> +                       include = want >= 2;
> +                       stop_at = offset;
> +
> +                       break;
> +
> +               case FDT_END:
> +                       dt_struct = dt_struct_advance(&f, dt_struct, FDT_TAGSIZE);
> +
> +                       include = 1;
> +
> +                       break;
> +
> +               default:
> +                       pr_err("%s: Unknown tag 0x%08X\n", __func__, tag);
> +                       return -EINVAL;
> +               }
> +
> +               if (!dt_struct)
> +                       return -ESPIPE;
> +
> +               pr_debug("%s: include %d, want %d, offset 0x%x, len 0x%x\n",
> +                        path, include, want, offset, dt_struct-offset);
> +
> +               if (include && start == -1)
> +                       start = offset;
> +
> +               if (!include && start != -1) {
> +                       pr_debug("region: 0x%p+0x%x\n", fit+start, offset-start);
> +                       digest_update(digest, fit+start, offset-start);
> +                       start = -1;
> +               }
> +       } while (tag != FDT_END);
> +
> +       pr_debug("region: 0x%p+0x%x\n", fit+start, dt_struct-start);
> +       digest_update(digest, fit+start, dt_struct-start);
> +
> +       pr_debug("strings: 0x%p+0x%x\n", dt_strings+hashed_strings_start, hashed_strings_size);
> +       digest_update(digest, dt_strings+hashed_strings_start, hashed_strings_size);
> +
> +       return 0;
> +}
> +
> +/*
> + * The consistency of the FTD structure was already checked by of_unflatten_dtb()
> + */
> +static int fit_verify_signature(struct device_node *sig_node, void *fit)
> +{
> +       uint32_t hashed_strings_start, hashed_strings_size;
> +       struct string_list inc_nodes, exc_props;
> +       struct rsa_public_key key = {};
> +       struct digest *digest;
> +       int sig_len;
> +       const char *algo_name, *key_name, *sig_value;
> +       char *key_path;
> +       struct device_node *key_node;
> +       enum hash_algo algo;
> +       void *hash;
> +       int ret;
> +
> +       if (of_property_read_string(sig_node, "algo", &algo_name)) {
> +               pr_err("algo not found\n");
> +               ret = -EINVAL;
> +               goto out;
> +       }
> +       if (strcmp(algo_name, "sha1,rsa2048") == 0) {
> +               algo = HASH_ALGO_SHA1;
> +       } else if (strcmp(algo_name, "sha256,rsa4096") == 0) {
> +               algo = HASH_ALGO_SHA256;
> +       } else  {
> +               pr_err("unknown algo %s\n", algo_name);
> +               ret = -EINVAL;
> +               goto out;
> +       }
> +       digest = digest_alloc_by_algo(algo);
> +       if (!digest) {
> +               pr_err("unsupported algo %s\n", algo_name);
> +               ret = -EINVAL;
> +               goto out;
> +       }
> +
> +       sig_value = of_get_property(sig_node, "value", &sig_len);
> +       if (!sig_value) {
> +               pr_err("signature value not found\n");
> +               ret = -EINVAL;
> +               goto out_free_digest;
> +       }
> +
> +       if (of_property_read_string(sig_node, "key-name-hint", &key_name)) {
> +               pr_err("key name not found\n");
> +               ret = -EINVAL;
> +               goto out_free_digest;
> +       }
> +       key_path = asprintf("/signature/key-%s", key_name);
> +       if (!key_name) {
> +               ret = -ENOMEM;
> +               goto out_free_digest;
> +       }
> +       key_node = of_find_node_by_path(key_path);
> +       free(key_path);
> +       if (!key_node) {
> +               pr_info("failed to find key node\n");
> +               ret = -ENOENT;
> +               goto out_free_digest;
> +       }
> +
> +       ret = rsa_of_read_key(key_node, &key);
> +       if (ret) {
> +               pr_info("failed to read key\n");
> +               ret = -ENOENT;
> +               goto out_free_digest;
> +       }
> +
> +       if (of_property_read_u32_index(sig_node, "hashed-strings", 0, &hashed_strings_start)) {
> +               pr_err("%s: hashed-strings start not found\n", __func__);
> +               ret = -EINVAL;
> +               goto out_free_digest;
> +       }
> +       if (of_property_read_u32_index(sig_node, "hashed-strings", 1, &hashed_strings_size)) {
> +               pr_err("%s: hashed-strings size not found\n", __func__);
> +               ret = -EINVAL;
> +               goto out_free_digest;
> +       }
> +
> +       string_list_init(&inc_nodes);
> +       string_list_init(&exc_props);
> +
> +       if (of_read_string_list(sig_node, "hashed-nodes", &inc_nodes)) {
> +               pr_err("%s: hashed-nodes invalid\n", __func__);
> +               ret = -EINVAL;
> +               goto out_sl;
> +       }
> +
> +       string_list_add(&exc_props, "data");
> +
> +       digest_init(digest);
> +       ret = fit_digest(fit, digest, &inc_nodes, &exc_props, hashed_strings_start, hashed_strings_size);
> +       hash = xzalloc(digest_length(digest));
> +       digest_final(digest, hash);
> +
> +       ret = rsa_verify(&key, sig_value, sig_len, hash, algo);
> +       if (ret) {
> +               pr_info("sig BAD\n");
> +               ret = CHECK_LEVEL_NONE;
> +       } else {
> +               pr_info("sig OK\n");
> +               ret = CHECK_LEVEL_SIG;
> +       }
> +
> +       free(hash);
> + out_sl:
> +       string_list_free(&inc_nodes);
> +       string_list_free(&exc_props);
> + out_free_digest:
> +       digest_free(digest);
> + out:
> +       return ret;
> +}
> +
> +static int fit_verify_hash(struct device_node *hash, const void *data, int data_len)
> +{
> +       struct digest *d;
> +       const char *algo;
> +       const char *value_read;
> +       char *value_calc;
> +       int hash_len;
> +
> +       value_read = of_get_property(hash, "value", &hash_len);
> +       if (!value_read) {
> +               pr_err("value not found\n");
> +               return CHECK_LEVEL_NONE;
> +       }
> +
> +       if (of_property_read_string(hash, "algo", &algo)) {
> +               pr_err("algo not found\n");
> +               return -EINVAL;
> +       }
> +
> +       d = digest_alloc(algo);
> +       if (!d) {
> +               pr_err("unsupported algo %s\n", algo);
> +               return -EINVAL;
> +       }
> +
> +       if (hash_len != digest_length(d)) {
> +               pr_err("invalid hash length %d\n", hash_len);
> +               digest_free(d);
> +               return -EINVAL;
> +       }
> +
> +       value_calc = xmalloc(hash_len);
> +
> +       digest_init(d);
> +       digest_update(d, data, data_len);
> +       digest_final(d, value_calc);
> +
> +       if (memcmp(value_read, value_calc, hash_len)) {
> +               pr_info("hash BAD\n");
> +               digest_free(d);
> +               return CHECK_LEVEL_NONE;
> +       } else {
> +               pr_info("hash OK\n");
> +               digest_free(d);
> +               return CHECK_LEVEL_HASH;
> +       }
> +}
> +
> +static int fit_open_image(struct fit_handle *handle, const char* unit)
> +{
> +       struct device_node *image = NULL, *hash;
> +       const char *type = NULL, *desc;
> +       const void *data;
> +       int data_len;
> +       int ret, level;
> +
> +       image = of_get_child_by_name(handle->root, "images");
> +       if (!image)
> +               return -ENOENT;
> +
> +       image = of_get_child_by_name(image, unit);
> +       if (!image)
> +               return -ENOENT;
> +
> +       if (of_property_read_string(image, "description", &desc)) {
> +               pr_info("FIT image '%s' (no description)\n", unit);
> +       } else {
> +               pr_info("FIT image '%s': '%s'\n", unit, desc);
> +       }
> +
> +       of_property_read_string(image, "type", &type);
> +       if (!type)
> +               return -EINVAL;
> +
> +       data = of_get_property(image, "data", &data_len);
> +       if (!data) {
> +               pr_err("data not found\n");
> +               return -EINVAL;
> +       }
> +
> +       level = CHECK_LEVEL_MAX;
> +       for_each_child_of_node(image, hash) {
> +               if (handle->verbose)
> +                       of_print_nodes(hash, 0);
> +               ret = fit_verify_hash(hash, data, data_len);
> +               if (ret < 0)
> +                       return ret;
> +               level = min(level, ret);
> +       }
> +       if (level == CHECK_LEVEL_MAX) {
> +               return -EINVAL;
> +       }
> +
> +       if (level == CHECK_LEVEL_HASH) {
> +               if (strcmp(type, "kernel") == 0 ||
> +                   strcmp(type, "kernel_noload") == 0) {
> +                       handle->kernel = data;
> +                       handle->kernel_size = data_len;
> +               } else if (strcmp(type, "flat_dt") == 0) {
> +                       handle->oftree = data;
> +                       handle->oftree_size = data_len;
> +               } else if (strcmp(type, "ramdisk") == 0) {
> +                       handle->initrd = data;
> +                       handle->initrd_size = data_len;
> +               } else {
> +                       pr_info("unknown image type %s, ignoring\n", type);
> +               }
> +       }
> +
> +       return level;
> +}
> +
> +static int fit_open_configuration(struct fit_handle *handle, int num)
> +{
> +       struct device_node *conf_node = NULL, *sig_node;
> +       char unit_name[10];
> +       const char *unit, *desc;
> +       int ret, level;
> +
> +       conf_node = of_get_child_by_name(handle->root, "configurations");
> +       if (!conf_node)
> +               return -ENOENT;
> +
> +       if (num) {
> +               snprintf(unit_name, sizeof(unit_name), "conf@%d", num);

This is not working for my *.its file:
https://github.com/visionsystemsgmbh/onrisc_br_bsp/blob/master/board/vscom/baltos/kernel-fit.its
U-Boot is working with bootm ${loadaddr}#conf${board_name}

For Barebox I've changed this line to

snprintf(unit_name, sizeof(unit_name), "conf%d@1", num)

This is how I start Linux: bootm /boot/kernel-fit.itb@$global.board.id

What is the standard for providing FIT configuration?

> +               unit = unit_name;
> +       } else if (of_property_read_string(conf_node, "default", &unit)) {
> +               unit = "conf@1";
> +       }
> +
> +       conf_node = of_get_child_by_name(conf_node, unit);
> +       if (!conf_node) {
> +               pr_err("FIT configuration '%s' not found\n", unit);
> +               return -ENOENT;
> +       }
> +
> +       if (of_property_read_string(conf_node, "description", &desc)) {
> +               pr_info("FIT configuration '%s' (no description)\n", unit);
> +       } else {
> +               pr_info("FIT configuration '%s': '%s'\n", unit, desc);
> +       }
> +
> +       level = CHECK_LEVEL_MAX;
> +       for_each_child_of_node(conf_node, sig_node) {
> +               if (handle->verbose)
> +                       of_print_nodes(sig_node, 0);
> +               ret = fit_verify_signature(sig_node, handle->fit);
> +               if (ret < 0)
> +                       return ret;
> +               level = min(level, ret);
> +       }
> +       if (level == CHECK_LEVEL_MAX)
> +               return -EINVAL;
> +
> +       if (level != CHECK_LEVEL_SIG)
> +               return -EINVAL;
> +
> +       if (of_property_read_string(conf_node, "kernel", &unit) == 0)
> +               level = min(level, fit_open_image(handle, unit));
> +       else
> +               return -ENOENT;
> +
> +       if (of_property_read_string(conf_node, "fdt", &unit) == 0)
> +               level = min(level, fit_open_image(handle, unit));
> +
> +       if (of_property_read_string(conf_node, "ramdisk", &unit) == 0)
> +               level = min(level, fit_open_image(handle, unit));
> +
> +       if (level != CHECK_LEVEL_HASH)
> +               return -EINVAL;
> +
> +       return 0;
> +}
> +
> +struct fit_handle *fit_open(const char *filename, int num, bool verbose)
> +{
> +       struct fit_handle *handle = NULL;
> +       const char *desc;
> +
> +       handle = xzalloc(sizeof(struct fit_handle));
> +
> +       handle->verbose = verbose;
> +
> +       handle->fit = read_file(filename, &handle->size);
> +       if (!handle->fit) {
> +               pr_err("unable to read %s: %s\n", filename, strerror(errno));
> +               goto err;
> +       }
> +
> +       handle->root = of_unflatten_dtb(handle->fit);
> +       if (IS_ERR(handle->root)) {
> +               goto err;
> +       }
> +
> +       if (of_property_read_string(handle->root, "description", &desc)) {
> +               pr_info("FIT '%s' (no description)\n", filename);
> +       } else {
> +               pr_info("FIT '%s': '%s'\n", filename, desc);
> +       }
> +
> +       if (fit_open_configuration(handle, num))
> +               goto err;
> +
> +       return handle;
> + err:
> +       if (handle->root)
> +               of_delete_node(handle->root);
> +       if (handle->fit)
> +               free(handle->fit);
> +       free(handle);
> +
> +       return NULL;
> +}
> +
> +void fit_close(struct fit_handle *handle)
> +{
> +       if (handle->root)
> +               of_delete_node(handle->root);
> +       if (handle->fit)
> +               free(handle->fit);
> +       free(handle);
> +}
> +
> +#ifdef CONFIG_SANDBOX
> +static int do_bootm_sandbox_fit(struct image_data *data)
> +{
> +       struct fit_handle *handle;
> +       handle = fit_open(data->os_file, data->os_num, data->verbose);
> +       if (handle)
> +               fit_close(handle);
> +       return 0;
> +}
> +
> +static struct image_handler sandbox_fit_handler = {
> +       .name = "FIT image",
> +       .bootm = do_bootm_sandbox_fit,
> +       .filetype = filetype_oftree,
> +};
> +
> +static int sandbox_fit_register(void)
> +{
> +       return register_image_handler(&sandbox_fit_handler);
> +}
> +late_initcall(sandbox_fit_register);
> +#endif
> diff --git a/include/image-fit.h b/include/image-fit.h
> new file mode 100644
> index 000000000000..bcbc859ead37
> --- /dev/null
> +++ b/include/image-fit.h
> @@ -0,0 +1,42 @@
> +/*
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + *
> + * Copyright (C) Jan Lübbe, 2014
> + */
> +
> +#ifndef __IMAGE_FIT_H__
> +#define __IMAGE_FIT_H__
> +
> +#include <linux/types.h>
> +
> +struct fit_handle {
> +       void *fit;
> +       size_t size;
> +
> +       bool verbose;
> +
> +       struct device_node *root;
> +
> +       const void *kernel;
> +       unsigned long kernel_size;
> +       const void *oftree;
> +       unsigned long oftree_size;
> +       const void *initrd;
> +       unsigned long initrd_size;
> +};
> +
> +struct fit_handle *fit_open(const char *filename, int num, bool verbose);
> +void fit_close(struct fit_handle *handle);
> +
> +#endif /* __IMAGE_FIT_H__ */
> --
> 2.6.2
>

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