Android avb學習總結
device-mapper
基本概念
**Mapped Device:**邏輯抽象，可以理解為內核對外提供的邏輯設備，主要功能是通過Mapping Table描述的映射關系與Target Device建立映射。
**Mapping Table:**內部含有Mapped Device邏輯的起始地址、范圍、和表示在Target Device所在物理設備的偏移量及Target等信息(這些地址和偏移量都是以磁盤的扇區為單位的，即 512 個字節大小，所以，當你看到128的時候，其實表示的是128*512=64K)。
**Target Device:**目標設備，Target device描述的的是mapped device所映射的物理空間段，此設備為mapped device所映射的時間物理設備。
**Target Driver:**允許開發者自己定義的IO處理規則,目前支持linear，raid，verity，mulipath，snapshot，mirror，crypt，cache，era，thin等。
Mapping Device不但可以映射Target Device，而且可以映射Mapping Device.
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Mapped eviceMapping Table
Target DriverDevice Target
Android avb
1.需要知道的是avb是基于dm框架。
環境
Android 11、動態分區
需要修改的文件
1.分區表，再分區表中添加vbmeta、vbmeta_system、vbmeta_vendor分區
2.fstab.***,添加對應的vbmeta、vbmeta_system、vbmeta_vendor
system /system ext4 ro,barrier=1 wait,avb=vbmeta,logical,first_stage_mount
vendor /vendor ext4 ro,barrier=1 wait,avb,logical,first_stage_mount
#未實現product分區
#product /product ext4 ro,barrier=1 wait,avb,logical,first_stage_mount
3.device.mk.
# for avb
BUILD_WITH_AVB := true
ifeq ($(BUILD_WITH_AVB),true)
BOARD_AVB_ENABLE := true
BOARD_AVB_ALGORITHM := SHA256_RSA2048
BOARD_AVB_ROLLBACK_INDEX := 0
BOARD_AVB_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
BOARD_AVB_RECOVERY_ALGORITHM := SHA256_RSA2048
BOARD_AVB_RECOVERY_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
BOARD_AVB_RECOVERY_ROLLBACK_INDEX := 0
BOARD_AVB_RECOVERY_ROLLBACK_INDEX_LOCATION := 0
endifBOARD_AVB_VBMETA_SYSTEM := system
BOARD_AVB_VBMETA_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
BOARD_AVB_VBMETA_SYSTEM_ALGORITHM := SHA256_RSA2048
BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX_LOCATION := 1BOARD_AVB_VBMETA_VENDOR := vendor
BOARD_AVB_VBMETA_VENDOR_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
BOARD_AVB_VBMETA_VENDOR_ALGORITHM := SHA256_RSA2048
BOARD_AVB_VBMETA_VENDOR_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
BOARD_AVB_VBMETA_VENDOR_ROLLBACK_INDEX_LOCATION := 1#BOARD_AVB_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
#BOARD_AVB_SYSTEM_ALGORITHM := SHA256_RSA2048
#BOARD_AVB_SYSTEM_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
#BOARD_AVB_SYSTEM_ROLLBACK_INDEX_LOCATION := 1#BOARD_AVB_VENDOR_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
#BOARD_AVB_VENDOR_ALGORITHM := SHA256_RSA2048
#BOARD_AVB_VENDOR_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
#BOARD_AVB_VENDOR_ROLLBACK_INDEX_LOCATION := 1
至此配置方面的工作已經做完了，之后根據報錯的log添加即可。
修改BoardConfig.mk
#BOARD_KERNEL_CMDLINE += androidboot.vbmeta_system.size=1664
BOARD_KERNEL_CMDLINE += androidboot.vbmeta.size=3328(根據log計算得出)
#BOARD_KERNEL_CMDLINE += androidboot.vbmeta_system.hash_alg=sha256
BOARD_KERNEL_CMDLINE += androidboot.vbmeta.hash_alg=sha256
BOARD_KERNEL_CMDLINE += androidboot.vbmeta.device=***(vbmeta.img燒錄的partuid)
之后需要通過
avbtool calculate_vbmeta_digest --hash_algorithm sha256 --image vbmeta.img
計算存根并放到cmdline，然后在運行階段中system/core/fs_mgr/libfs_avb.cpp中會有函數進行check
上圖為成功添加avb的log。
目前只是簡易實現，很多功能還不完善后續再跟進吧。
參考:
https://www.pianshen.com/article/53031602444/
https://blog.csdn.net/qq_36962569/article/details/108171310?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-0&spm=1001.2101.3001.4242
總結
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