Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 2 | |
| 3 | #include <assert.h> |
Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 4 | #include <metadata_hash.h> |
| 5 | #include <symbols.h> |
| 6 | |
Julius Werner | 6296ca8 | 2021-04-02 16:31:21 -0700 | [diff] [blame] | 7 | #if !CONFIG(COMPRESS_BOOTBLOCK) || ENV_DECOMPRESSOR |
Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 8 | __attribute__((used, section(".metadata_hash_anchor"))) |
| 9 | static struct metadata_hash_anchor metadata_hash_anchor = { |
| 10 | /* This is the only place in all of coreboot where we actually need to use this. */ |
| 11 | .magic = DO_NOT_USE_METADATA_HASH_ANCHOR_MAGIC_DO_NOT_USE, |
| 12 | .cbfs_hash = { .algo = CONFIG_CBFS_HASH_ALGO } |
| 13 | }; |
| 14 | |
Julius Werner | 6296ca8 | 2021-04-02 16:31:21 -0700 | [diff] [blame] | 15 | static struct metadata_hash_anchor *get_anchor(void) |
| 16 | { |
| 17 | return &metadata_hash_anchor; |
| 18 | } |
| 19 | |
| 20 | void *metadata_hash_export_anchor(void) |
| 21 | { |
| 22 | return get_anchor(); |
| 23 | } |
| 24 | #else |
| 25 | static struct metadata_hash_anchor *anchor_ptr = NULL; |
| 26 | |
| 27 | static struct metadata_hash_anchor *get_anchor(void) |
| 28 | { |
| 29 | assert(anchor_ptr != NULL); |
| 30 | return anchor_ptr; |
| 31 | } |
| 32 | |
| 33 | void metadata_hash_import_anchor(void *ptr) |
| 34 | { |
| 35 | anchor_ptr = ptr; |
| 36 | } |
| 37 | #endif |
| 38 | |
Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 39 | struct vb2_hash *metadata_hash_get(void) |
| 40 | { |
Julius Werner | 6296ca8 | 2021-04-02 16:31:21 -0700 | [diff] [blame] | 41 | return &get_anchor()->cbfs_hash; |
Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | vb2_error_t metadata_hash_verify_fmap(const void *fmap_buffer, size_t fmap_size) |
| 45 | { |
Julius Werner | 6296ca8 | 2021-04-02 16:31:21 -0700 | [diff] [blame] | 46 | struct vb2_hash hash = { .algo = get_anchor()->cbfs_hash.algo }; |
| 47 | memcpy(hash.raw, metadata_hash_anchor_fmap_hash(get_anchor()), |
Julius Werner | fdabf3f | 2020-05-06 17:06:35 -0700 | [diff] [blame] | 48 | vb2_digest_size(hash.algo)); |
| 49 | return vb2_hash_verify(fmap_buffer, fmap_size, &hash); |
| 50 | } |