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Patch AVB structures

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Disable vbmeta verification in flags
This commit is contained in:
topjohnwu
2021-03-02 20:37:37 -08:00
parent 55fdee4d65
commit 027ec70262
7 changed files with 161 additions and 75 deletions
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48
native/jni/magiskboot/bootimg.hpp
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@@ -41,6 +41,49 @@ struct blob_hdr {
uint32_t version; /* 0x00000001 */
} __attribute__((packed));
/**************
* AVB Headers
**************/
#define AVB_FOOTER_MAGIC_LEN 4
#define AVB_MAGIC_LEN 4
#define AVB_RELEASE_STRING_SIZE 48
// https://android.googlesource.com/platform/external/avb/+/refs/heads/android11-release/libavb/avb_footer.h
struct AvbFooter {
uint8_t magic[AVB_FOOTER_MAGIC_LEN];
uint32_t version_major;
uint32_t version_minor;
uint64_t original_image_size;
uint64_t vbmeta_offset;
uint64_t vbmeta_size;
uint8_t reserved[28];
} __attribute__((packed));
// https://android.googlesource.com/platform/external/avb/+/refs/heads/android11-release/libavb/avb_vbmeta_image.h
struct AvbVBMetaImageHeader {
uint8_t magic[AVB_MAGIC_LEN];
uint32_t required_libavb_version_major;
uint32_t required_libavb_version_minor;
uint64_t authentication_data_block_size;
uint64_t auxiliary_data_block_size;
uint32_t algorithm_type;
uint64_t hash_offset;
uint64_t hash_size;
uint64_t signature_offset;
uint64_t signature_size;
uint64_t public_key_offset;
uint64_t public_key_size;
uint64_t public_key_metadata_offset;
uint64_t public_key_metadata_size;
uint64_t descriptors_offset;
uint64_t descriptors_size;
uint64_t rollback_index;
uint32_t flags;
uint32_t rollback_index_location;
uint8_t release_string[AVB_RELEASE_STRING_SIZE];
uint8_t reserved[80];
} __attribute__((packed));
/*********************
* Boot Image Headers
@@ -402,6 +445,7 @@ enum {
BLOB_FLAG,
NOOKHD_FLAG,
ACCLAIM_FLAG,
AVB_FLAG,
BOOT_FLAGS_MAX
};
@@ -436,6 +480,10 @@ struct boot_img {
uint8_t *tail;
size_t tail_size = 0;
// AVB structs
AvbFooter *avb_footer;
AvbVBMetaImageHeader *avb_meta;
// Pointers to blocks defined in header
uint8_t *hdr_addr;
uint8_t *kernel;