| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <assert.h> |
| #include <metadata_hash.h> |
| #include <symbols.h> |
| |
| #if !CONFIG(COMPRESS_BOOTBLOCK) || ENV_DECOMPRESSOR |
| __attribute__((used, section(".metadata_hash_anchor"))) |
| static struct metadata_hash_anchor metadata_hash_anchor = { |
| /* This is the only place in all of coreboot where we actually need to use this. */ |
| .magic = DO_NOT_USE_METADATA_HASH_ANCHOR_MAGIC_DO_NOT_USE, |
| .cbfs_hash = { .algo = CONFIG_CBFS_HASH_ALGO } |
| }; |
| |
| static struct metadata_hash_anchor *get_anchor(void) |
| { |
| return &metadata_hash_anchor; |
| } |
| |
| void *metadata_hash_export_anchor(void) |
| { |
| return get_anchor(); |
| } |
| #else |
| static struct metadata_hash_anchor *anchor_ptr = NULL; |
| |
| static struct metadata_hash_anchor *get_anchor(void) |
| { |
| assert(anchor_ptr != NULL); |
| return anchor_ptr; |
| } |
| |
| void metadata_hash_import_anchor(void *ptr) |
| { |
| anchor_ptr = ptr; |
| } |
| #endif |
| |
| struct vb2_hash *metadata_hash_get(void) |
| { |
| return &get_anchor()->cbfs_hash; |
| } |
| |
| vb2_error_t metadata_hash_verify_fmap(const void *fmap_buffer, size_t fmap_size) |
| { |
| struct vb2_hash hash = { .algo = get_anchor()->cbfs_hash.algo }; |
| memcpy(hash.raw, metadata_hash_anchor_fmap_hash(get_anchor()), |
| vb2_digest_size(hash.algo)); |
| return vb2_hash_verify(fmap_buffer, fmap_size, &hash); |
| } |