mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 10:35:26 +00:00
501 lines
14 KiB
C++
501 lines
14 KiB
C++
#pragma once
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#include <stdint.h>
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#include <utility>
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#include <bitset>
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#include "format.hpp"
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/******************
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* Special Headers
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*****************/
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struct mtk_hdr {
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uint32_t magic; /* MTK magic */
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uint32_t size; /* Size of the content */
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char name[32]; /* The type of the header */
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char padding[472]; /* Padding to 512 bytes */
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} __attribute__((packed));
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struct dhtb_hdr {
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char magic[8]; /* DHTB magic */
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uint8_t checksum[40]; /* Payload SHA256, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
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uint32_t size; /* Payload size, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
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char padding[460]; /* Padding to 512 bytes */
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} __attribute__((packed));
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struct blob_hdr {
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char secure_magic[20]; /* "-SIGNED-BY-SIGNBLOB-" */
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uint32_t datalen; /* 0x00000000 */
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uint32_t signature; /* 0x00000000 */
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char magic[16]; /* "MSM-RADIO-UPDATE" */
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uint32_t hdr_version; /* 0x00010000 */
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uint32_t hdr_size; /* Size of header */
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uint32_t part_offset; /* Same as size */
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uint32_t num_parts; /* Number of partitions */
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uint32_t unknown[7]; /* All 0x00000000 */
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char name[4]; /* Name of partition */
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uint32_t offset; /* offset in blob where this partition starts */
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uint32_t size; /* Size of data */
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uint32_t version; /* 0x00000001 */
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} __attribute__((packed));
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/**************
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* AVB Headers
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**************/
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#define AVB_FOOTER_MAGIC_LEN 4
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#define AVB_MAGIC_LEN 4
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#define AVB_RELEASE_STRING_SIZE 48
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// https://android.googlesource.com/platform/external/avb/+/refs/heads/android11-release/libavb/avb_footer.h
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struct AvbFooter {
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uint8_t magic[AVB_FOOTER_MAGIC_LEN];
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uint32_t version_major;
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uint32_t version_minor;
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uint64_t original_image_size;
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uint64_t vbmeta_offset;
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uint64_t vbmeta_size;
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uint8_t reserved[28];
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} __attribute__((packed));
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// https://android.googlesource.com/platform/external/avb/+/refs/heads/android11-release/libavb/avb_vbmeta_image.h
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struct AvbVBMetaImageHeader {
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uint8_t magic[AVB_MAGIC_LEN];
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uint32_t required_libavb_version_major;
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uint32_t required_libavb_version_minor;
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uint64_t authentication_data_block_size;
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uint64_t auxiliary_data_block_size;
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uint32_t algorithm_type;
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uint64_t hash_offset;
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uint64_t hash_size;
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uint64_t signature_offset;
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uint64_t signature_size;
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uint64_t public_key_offset;
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uint64_t public_key_size;
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uint64_t public_key_metadata_offset;
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uint64_t public_key_metadata_size;
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uint64_t descriptors_offset;
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uint64_t descriptors_size;
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uint64_t rollback_index;
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uint32_t flags;
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uint32_t rollback_index_location;
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uint8_t release_string[AVB_RELEASE_STRING_SIZE];
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uint8_t reserved[80];
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} __attribute__((packed));
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/*********************
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* Boot Image Headers
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*********************/
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#define BOOT_MAGIC_SIZE 8
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#define BOOT_NAME_SIZE 16
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#define BOOT_ID_SIZE 32
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#define BOOT_ARGS_SIZE 512
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#define BOOT_EXTRA_ARGS_SIZE 1024
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#define VENDOR_BOOT_ARGS_SIZE 2048
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/*
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* +-----------------+
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* | boot header | 1 page
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* +-----------------+
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* | kernel | n pages
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* +-----------------+
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* | ramdisk | m pages
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* +-----------------+
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* | second stage | o pages
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* +-----------------+
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* | extra blob | x pages (non standard)
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* +-----------------+
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* | recovery dtbo | p pages
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* +-----------------+
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* | dtb | q pages
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* +-----------------+
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*
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* n = (kernel_size + page_size - 1) / page_size
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* m = (ramdisk_size + page_size - 1) / page_size
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* o = (second_size + page_size - 1) / page_size
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* p = (recovery_dtbo_size + page_size - 1) / page_size
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* q = (dtb_size + page_size - 1) / page_size
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* x = (extra_size + page_size - 1) / page_size
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*/
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struct boot_img_hdr_common {
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char magic[BOOT_MAGIC_SIZE];
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uint32_t kernel_size; /* size in bytes */
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uint32_t kernel_addr; /* physical load addr */
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uint32_t ramdisk_size; /* size in bytes */
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uint32_t ramdisk_addr; /* physical load addr */
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uint32_t second_size; /* size in bytes */
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uint32_t second_addr; /* physical load addr */
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} __attribute__((packed));
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struct boot_img_hdr_v0 : public boot_img_hdr_common {
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uint32_t tags_addr; /* physical addr for kernel tags */
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uint32_t page_size; /* flash page size we assume */
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// In header v1, this field is used for header version
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// However, on some devices like Samsung, this field is used to store DTB
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// We treat this field differently based on its value
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union {
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uint32_t header_version; /* the version of the header */
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uint32_t extra_size; /* extra blob size in bytes */
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};
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// Operating system version and security patch level.
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// For version "A.B.C" and patch level "Y-M-D":
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// (7 bits for each of A, B, C; 7 bits for (Y-2000), 4 bits for M)
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// os_version = A[31:25] B[24:18] C[17:11] (Y-2000)[10:4] M[3:0]
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uint32_t os_version;
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char name[BOOT_NAME_SIZE]; /* asciiz product name */
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char cmdline[BOOT_ARGS_SIZE];
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char id[BOOT_ID_SIZE]; /* timestamp / checksum / sha1 / etc */
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// Supplemental command line data; kept here to maintain
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// binary compatibility with older versions of mkbootimg.
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char extra_cmdline[BOOT_EXTRA_ARGS_SIZE];
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} __attribute__((packed));
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struct boot_img_hdr_v1 : public boot_img_hdr_v0 {
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uint32_t recovery_dtbo_size; /* size in bytes for recovery DTBO/ACPIO image */
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uint64_t recovery_dtbo_offset; /* offset to recovery dtbo/acpio in boot image */
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uint32_t header_size;
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} __attribute__((packed));
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struct boot_img_hdr_v2 : public boot_img_hdr_v1 {
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uint32_t dtb_size; /* size in bytes for DTB image */
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uint64_t dtb_addr; /* physical load address for DTB image */
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} __attribute__((packed));
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// Default to hdr v2
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using boot_img_hdr = boot_img_hdr_v2;
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// Special Samsung header
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struct boot_img_hdr_pxa : public boot_img_hdr_common {
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uint32_t extra_size; /* extra blob size in bytes */
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uint32_t unknown;
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uint32_t tags_addr; /* physical addr for kernel tags */
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uint32_t page_size; /* flash page size we assume */
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char name[24]; /* asciiz product name */
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char cmdline[BOOT_ARGS_SIZE];
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char id[BOOT_ID_SIZE]; /* timestamp / checksum / sha1 / etc */
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char extra_cmdline[BOOT_EXTRA_ARGS_SIZE];
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} __attribute__((packed));
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/* When the boot image header has a version of 3, the structure of the boot
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* image is as follows:
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*
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* +---------------------+
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* | boot header | 4096 bytes
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* +---------------------+
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* | kernel | m pages
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* +---------------------+
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* | ramdisk | n pages
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* +---------------------+
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*
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* m = (kernel_size + 4096 - 1) / 4096
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* n = (ramdisk_size + 4096 - 1) / 4096
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*
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* Note that in version 3 of the boot image header, page size is fixed at 4096 bytes.
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*
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* The structure of the vendor boot image (introduced with version 3 and
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* required to be present when a v3 boot image is used) is as follows:
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*
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* +---------------------+
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* | vendor boot header | o pages
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* +---------------------+
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* | vendor ramdisk | p pages
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* +---------------------+
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* | dtb | q pages
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* +---------------------+
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*
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* o = (2112 + page_size - 1) / page_size
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* p = (ramdisk_size + page_size - 1) / page_size
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* q = (dtb_size + page_size - 1) / page_size
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*/
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struct boot_img_hdr_v3 {
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uint8_t magic[BOOT_MAGIC_SIZE];
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uint32_t kernel_size; /* size in bytes */
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uint32_t ramdisk_size; /* size in bytes */
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uint32_t os_version;
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uint32_t header_size;
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uint32_t reserved[4];
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uint32_t header_version;
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char cmdline[BOOT_ARGS_SIZE + BOOT_EXTRA_ARGS_SIZE];
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} __attribute__((packed));
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struct boot_img_hdr_vnd_v3 {
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// Must be VENDOR_BOOT_MAGIC.
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uint8_t magic[BOOT_MAGIC_SIZE];
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// Version of the vendor boot image header.
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uint32_t header_version;
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uint32_t page_size; /* flash page size we assume */
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uint32_t kernel_addr; /* physical load addr */
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uint32_t ramdisk_addr; /* physical load addr */
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uint32_t ramdisk_size; /* size in bytes */
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char cmdline[VENDOR_BOOT_ARGS_SIZE];
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uint32_t tags_addr; /* physical addr for kernel tags (if required) */
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char name[BOOT_NAME_SIZE]; /* asciiz product name */
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uint32_t header_size;
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uint32_t dtb_size; /* size in bytes for DTB image */
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uint64_t dtb_addr; /* physical load address for DTB image */
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} __attribute__((packed));
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/*******************************
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* Polymorphic Universal Header
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*******************************/
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#define decl_var(name, len) \
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virtual uint##len##_t &name() { j##len = 0; return j##len; }
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#define decl_val(name, type) \
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virtual type name() { return 0; }
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struct dyn_img_hdr {
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// Standard entries
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decl_var(kernel_size, 32)
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decl_var(ramdisk_size, 32)
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decl_var(second_size, 32)
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decl_var(page_size, 32)
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decl_val(header_version, uint32_t)
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decl_var(extra_size, 32)
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decl_var(os_version, 32)
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decl_val(name, char *)
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decl_val(cmdline, char *)
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decl_val(id, char *)
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decl_val(extra_cmdline, char *)
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uint32_t kernel_dt_size = 0;
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// v1/v2 specific
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decl_var(recovery_dtbo_size, 32)
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decl_var(recovery_dtbo_offset, 64)
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decl_var(header_size, 32)
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decl_var(dtb_size, 32)
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virtual ~dyn_img_hdr() {
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free(raw);
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}
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virtual size_t hdr_size() = 0;
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virtual size_t hdr_space() { return page_size(); }
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virtual dyn_img_hdr *clone() = 0;
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const void *raw_hdr() const { return raw; }
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void print();
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void dump_hdr_file();
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void load_hdr_file();
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protected:
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union {
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// Main header could be either AOSP or PXA
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boot_img_hdr_v2 *v2_hdr; /* AOSP v2 header */
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boot_img_hdr_v3 *v3_hdr; /* AOSP v3 header */
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boot_img_hdr_pxa *hdr_pxa; /* Samsung PXA header */
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boot_img_hdr_vnd_v3 *vnd; /* AOSP vendor v3 header */
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void *raw; /* Raw pointer */
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};
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private:
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// Junk for references
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static uint32_t j32;
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static uint64_t j64;
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};
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#undef decl_var
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#undef decl_val
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#define __impl_cls(name, hdr) \
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protected: name() = default; \
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public: \
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name(void *ptr) { \
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raw = xmalloc(sizeof(hdr)); \
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memcpy(raw, ptr, sizeof(hdr)); \
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} \
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size_t hdr_size() override { return sizeof(hdr); } \
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dyn_img_hdr *clone() override { \
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auto p = new name(this->raw); \
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p->kernel_dt_size = kernel_dt_size; \
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return p; \
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};
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#define __impl_val(name, hdr_name) \
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decltype(std::declval<dyn_img_hdr>().name()) name() override { return hdr_name->name; }
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#define impl_cls(ver) __impl_cls(dyn_img_##ver, boot_img_hdr_##ver)
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#define impl_val(name) __impl_val(name, v2_hdr)
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struct dyn_img_common : public dyn_img_hdr {
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impl_val(kernel_size)
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impl_val(ramdisk_size)
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impl_val(second_size)
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};
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struct dyn_img_v0 : public dyn_img_common {
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impl_cls(v0)
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impl_val(page_size)
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impl_val(extra_size)
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impl_val(os_version)
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impl_val(name)
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impl_val(cmdline)
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impl_val(id)
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impl_val(extra_cmdline)
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};
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struct dyn_img_v1 : public dyn_img_v0 {
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impl_cls(v1)
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impl_val(header_version)
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impl_val(recovery_dtbo_size)
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impl_val(recovery_dtbo_offset)
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impl_val(header_size)
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uint32_t &extra_size() override { return dyn_img_hdr::extra_size(); }
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};
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struct dyn_img_v2 : public dyn_img_v1 {
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impl_cls(v2)
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impl_val(dtb_size)
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};
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#undef impl_val
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#define impl_val(name) __impl_val(name, hdr_pxa)
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struct dyn_img_pxa : public dyn_img_common {
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impl_cls(pxa)
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impl_val(extra_size)
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impl_val(page_size)
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impl_val(name)
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impl_val(cmdline)
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impl_val(id)
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impl_val(extra_cmdline)
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};
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#undef impl_val
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#define impl_val(name) __impl_val(name, v3_hdr)
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struct dyn_img_v3 : public dyn_img_hdr {
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impl_cls(v3)
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impl_val(kernel_size)
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impl_val(ramdisk_size)
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impl_val(os_version)
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impl_val(header_size)
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impl_val(header_version)
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impl_val(cmdline)
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// Make API compatible
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uint32_t &page_size() override { page_sz = 4096; return page_sz; }
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char *extra_cmdline() override { return &v3_hdr->cmdline[BOOT_ARGS_SIZE]; }
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private:
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uint32_t page_sz = 4096;
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};
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#undef impl_val
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#define impl_val(name) __impl_val(name, vnd)
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struct dyn_img_vnd_v3 : public dyn_img_hdr {
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impl_cls(vnd_v3)
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impl_val(header_version)
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impl_val(page_size)
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impl_val(ramdisk_size)
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impl_val(cmdline)
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impl_val(name)
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impl_val(header_size)
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impl_val(dtb_size)
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size_t hdr_space() override { auto sz = page_size(); return do_align(hdr_size(), sz); }
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// Make API compatible
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char *extra_cmdline() override { return &vnd->cmdline[BOOT_ARGS_SIZE]; }
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};
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#undef __impl_cls
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#undef __impl_val
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#undef impl_cls
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#undef impl_val
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/******************
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* Full Boot Image
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******************/
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enum {
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MTK_KERNEL,
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MTK_RAMDISK,
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CHROMEOS_FLAG,
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DHTB_FLAG,
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SEANDROID_FLAG,
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LG_BUMP_FLAG,
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SHA256_FLAG,
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BLOB_FLAG,
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NOOKHD_FLAG,
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ACCLAIM_FLAG,
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AVB_FLAG,
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BOOT_FLAGS_MAX
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};
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struct boot_img {
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// Memory map of the whole image
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uint8_t *map_addr;
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size_t map_size;
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// Android image header
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dyn_img_hdr *hdr;
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// Flags to indicate the state of current boot image
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std::bitset<BOOT_FLAGS_MAX> flags;
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// The format of kernel, ramdisk and extra
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format_t k_fmt = UNKNOWN;
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format_t r_fmt = UNKNOWN;
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format_t e_fmt = UNKNOWN;
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/***************************************************
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* Following pointers points within the mmap region
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***************************************************/
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// MTK headers
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mtk_hdr *k_hdr;
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mtk_hdr *r_hdr;
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// Pointer to dtb that is embedded in kernel
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uint8_t *kernel_dtb;
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// Pointer to end of image
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uint8_t *tail;
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size_t tail_size = 0;
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// AVB structs
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AvbFooter *avb_footer;
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AvbVBMetaImageHeader *avb_meta;
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// Pointers to blocks defined in header
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uint8_t *hdr_addr;
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uint8_t *kernel;
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uint8_t *ramdisk;
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uint8_t *second;
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uint8_t *extra;
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uint8_t *recovery_dtbo;
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uint8_t *dtb;
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boot_img(const char *);
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~boot_img();
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void parse_image(uint8_t *addr, format_t type);
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};
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