编译兼容内核模块的版本

前篇 已经成功编译出了适合 avd 使用的内核，然而同时需要编译兼容的内核模块，过于复杂。经过一番探索，发现只要找到正确的源码，还是能编译出与发布的 avd 镜像兼容的内核。

认识版本号

还是回到 /proc/version 上，内核的版本号提供了很多信息，比如 -g 后跟着的是一个 12 位 16 进制数，表示编译的内核的源码树的提交 hash ，此外还有编译器版本。

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Linux version 6.1.23-android14-4-00257-g7e35917775b8-ab9964412 (build-user@build-host) (Android (9796371, based on r487747) clang version 17.0.0 (https://android.googlesource.com/toolchain/llvm-project d9f89f4d16663d5012e5c09495f3b30ece3d2362), LLD 17.0.0) #1 SMP PREEMPT Mon Apr 17 20:50:58 UTC 2023

然而只有这些信息并不足以找到所有的代码，因为 repo clone 下来的实际上是多个仓库，而提交 hash 只是 common 仓库下的。

注意到 -ab 后面跟着一串数字，实际上对应了 Android CI 的 id 。

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# common/scripts/setlocalversion

# finally, add the abXXX number if BUILD_NUMBER is set
if test -n "${BUILD_NUMBER}"; then
	res="$res-ab${BUILD_NUMBER}"
fi

echo "$res"

可以看到 Android CI 中有分支 aosp_kernel-common-android14-6.1

包含了数个内核 CI 构建，其中 kernel_virt_x86_64 才是我们需要的内核。随便点开一个 artifcat ，url 形如：

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https://ci.android.com/builds/submitted/11381674/kernel_virt_x86_64/latest

把 11381674 换成我们的内核的 build number 9964412 ，即可找到这一次构建。

https://ci.android.com/builds/submitted/9964412/kernel_virt_x86_64/latest

下载 bzImage ，发现和 avd 的 kernel-ranchu 还是有一定出入，不过是可以启动的。因此，我们只要根据 CI 中输出的信息，找到构建时各个仓库的提交即可。

CI BuildInfo

https://ci.android.com/builds/submitted/9964412/kernel_virt_x86_64/latest/view/BUILD_INFO

（文末附有 json 原文）

parsed_manifest 提供了构建时的 manifest 对应的所有仓库的 revision ，比如 common ，可以看到提交 hash 和我们的内核是一致的:

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{
    "linkFiles": [
        {
            "dest": ".source_date_epoch_dir",
            "src": "."
        }
    ],
    "name": "kernel/common",
    "path": "common",
    "remote": {
        "fetch": "https://android.googlesource.com/",
        "name": "aosp",
        "review": "https://android.googlesource.com/"
    },
    "revision": "7e35917775b8b3e3346a87f294e334e258bf15e6"
},

name 是远程仓库的 path ，path 是本地的 path 。由于不知道如何用 repo 处理这些，因此我们手动 cd 到 path 对应的目录，检出对应的 revision 。

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cd $PATH
git fetch aosp $REVISION
git branch my $REVISION
git checkout my

编译 virtual device kernel

build info 还告诉了我们如何构建这种 kernel_virt :

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tools/bazel run --verbose_failures --jobs=%cpu% --make_jobs=%cpu% --config=android_ci --profile=%dist_dir%/logs/command.profile.json //common-modules/virtual-device:virtual_device_x86_64_dist -- --dist_dir=%dist_dir% --flat

我们应该运行 //common-modules/virtual-device:virtual_device_x86_64_dist 。

实际上文档也有提到，不过我以为只是构建模块。

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tools/bazel run --config=fast --config=stamp --lto=none //common-modules/virtual-device:virtual_device_x86_64_dist -- --dist_dir=virt

如此一来构建的内核就和已有的模块兼容了，我们也可以顺利地将 KernelSU 集成进去。

附录

json
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{
    "best_target_priority": 1,
    "bid": "9964412",
    "branch": "aosp_kernel-common-android14-6.1",
    "branch_priority": 1,
    "build_configs": {},
    "build_dependencies": [],
    "build_type": "submitted",
    "dependency_targets": [],
    "device_dir": "/buildbot/src/android/common-android14-6.1",
    "docker_image": null,
    "enable_docker": true,
    "git-pull": null,
    "git-server": "https://android.googlesource.com",
    "hostname": "abfarm-2004-0434",
    "inc-build": false,
    "java-version": null,
    "last_logfile": null,
    "out_dir": "/buildbot/src/android/common-android14-6.1/out",
    "parsed_manifest": {
        "parsedDefault": {
            "remote": "aosp",
            "revision": "master",
            "syncJ": "4"
        },
        "projects": [
            {
                "linkFiles": [
                    {
                        "dest": "tools/bazel",
                        "src": "kleaf/bazel.sh"
                    },
                    {
                        "dest": "WORKSPACE",
                        "src": "kleaf/bazel.WORKSPACE"
                    },
                    {
                        "dest": "build/build.sh",
                        "src": "build.sh"
                    },
                    {
                        "dest": "build/build_abi.sh",
                        "src": "build_abi.sh"
                    },
                    {
                        "dest": "build/build_test.sh",
                        "src": "build_test.sh"
                    },
                    {
                        "dest": "build/build_utils.sh",
                        "src": "build_utils.sh"
                    },
                    {
                        "dest": "build/config.sh",
                        "src": "config.sh"
                    },
                    {
                        "dest": "build/envsetup.sh",
                        "src": "envsetup.sh"
                    },
                    {
                        "dest": "build/_setup_env.sh",
                        "src": "_setup_env.sh"
                    },
                    {
                        "dest": "build/multi-switcher.sh",
                        "src": "multi-switcher.sh"
                    },
                    {
                        "dest": "build/abi",
                        "src": "abi"
                    },
                    {
                        "dest": "build/static_analysis",
                        "src": "static_analysis"
                    }
                ],
                "name": "kernel/build",
                "path": "build/kernel",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "b0377a072bb3f78cdacfd6d809914a9d1b0c0148"
            },
            {
                "linkFiles": [
                    {
                        "dest": ".source_date_epoch_dir",
                        "src": "."
                    }
                ],
                "name": "kernel/common",
                "path": "common",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "7e35917775b8b3e3346a87f294e334e258bf15e6"
            },
            {
                "name": "kernel/tests",
                "path": "kernel/tests",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "c90a1c1b226b975cc31e709fa96fc1c6ecdbe272"
            },
            {
                "name": "kernel/configs",
                "path": "kernel/configs",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "52a7267d6a9f9efabf3cb43839bb5e7f7ff05be3"
            },
            {
                "name": "kernel/common-modules/virtual-device",
                "path": "common-modules/virtual-device",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "0d03de3246301028775f05ea388c2c444344a268"
            },
            {
                "cloneDepth": "1",
                "name": "platform/prebuilts/clang/host/linux-x86",
                "path": "prebuilts/clang/host/linux-x86",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "4f7e5adc160ab726ac5bafb260de98e612904c50"
            },
            {
                "cloneDepth": "1",
                "name": "platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8",
                "path": "prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "f7b0d5b0ee369864d5ac3e96ae24ec9e2b6a52da"
            },
            {
                "cloneDepth": "1",
                "name": "platform/prebuilts/build-tools",
                "path": "prebuilts/build-tools",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "dc92e06585a7647bf739a2309a721b82fcfa01d4"
            },
            {
                "cloneDepth": "1",
                "name": "platform/prebuilts/clang-tools",
                "path": "prebuilts/clang-tools",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "5611871963f54c688d3ac49e527aecdef21e8567"
            },
            {
                "cloneDepth": "1",
                "name": "kernel/prebuilts/build-tools",
                "path": "prebuilts/kernel-build-tools",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "2597cb1b5525e419b7fa806373be673054a68d29"
            },
            {
                "name": "platform/system/tools/mkbootimg",
                "path": "tools/mkbootimg",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "2680066d0844544b3e78d6022cd21321d31837c3"
            },
            {
                "cloneDepth": "1",
                "name": "platform/prebuilts/bazel/linux-x86_64",
                "path": "prebuilts/bazel/linux-x86_64",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "4fdb9395071ff22118311d434d697c2b6fd887b4"
            },
            {
                "cloneDepth": "1",
                "name": "platform/prebuilts/jdk/jdk11",
                "path": "prebuilts/jdk/jdk11",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "491e6aa056676f29c4541f71bd738e4e876e4ba2"
            },
            {
                "cloneDepth": "1",
                "name": "toolchain/prebuilts/ndk/r23",
                "path": "prebuilts/ndk-r23",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "19ac7e4eded12adb99d4f613490dde6dd0e72664"
            },
            {
                "name": "platform/external/bazel-skylib",
                "path": "external/bazel-skylib",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "f998e5dc13c03f0eae9e373263d3afff0932c738"
            },
            {
                "name": "platform/build/bazel_common_rules",
                "path": "build/bazel_common_rules",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "707b2c5fe3d0d7d934a93e00a8a4062e83557831"
            },
            {
                "name": "platform/external/stardoc",
                "path": "external/stardoc",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "e83f522ee95419e55d2c5654aa6e0143beeef595"
            },
            {
                "name": "platform/external/python/absl-py",
                "path": "external/python/absl-py",
                "remote": {
                    "fetch": "https://android.googlesource.com/",
                    "name": "aosp",
                    "review": "https://android.googlesource.com/"
                },
                "revision": "393d0b1e3f0fea3e95944a2fd3282cc9f76d4f14"
            },
            {
                "name": "kernel/manifest",
                "path": "kernel/manifest",
                "remote": {
                    "fetch": "https://android.googlesource.com/"
                },
                "revision": "0c7921f01bec06d4957c8b36bb0efa84727c8fd6"
            }
        ],
        "remotes": [
            {
                "fetch": "https://android.googlesource.com/",
                "name": "aosp",
                "review": "https://android.googlesource.com/"
            }
        ],
        "superproject": {
            "name": "kernel/superproject",
            "remote": {
                "fetch": "https://android.googlesource.com/",
                "name": "aosp",
                "review": "https://android.googlesource.com/"
            },
            "revision": "cbe96ab89d71a8b85db7c868325242c36346893f"
        }
    },
    "platform": "linux",
    "presubmit_incremental_build": false,
    "proof_build": false,
    "repo-dict": {
        "kernel/build": "b0377a072bb3f78cdacfd6d809914a9d1b0c0148",
        "kernel/common": "7e35917775b8b3e3346a87f294e334e258bf15e6",
        "kernel/common-modules/virtual-device": "0d03de3246301028775f05ea388c2c444344a268",
        "kernel/configs": "52a7267d6a9f9efabf3cb43839bb5e7f7ff05be3",
        "kernel/manifest": "0c7921f01bec06d4957c8b36bb0efa84727c8fd6",
        "kernel/prebuilts/build-tools": "2597cb1b5525e419b7fa806373be673054a68d29",
        "kernel/tests": "c90a1c1b226b975cc31e709fa96fc1c6ecdbe272",
        "platform/build/bazel_common_rules": "707b2c5fe3d0d7d934a93e00a8a4062e83557831",
        "platform/external/bazel-skylib": "f998e5dc13c03f0eae9e373263d3afff0932c738",
        "platform/external/python/absl-py": "393d0b1e3f0fea3e95944a2fd3282cc9f76d4f14",
        "platform/external/stardoc": "e83f522ee95419e55d2c5654aa6e0143beeef595",
        "platform/prebuilts/bazel/linux-x86_64": "4fdb9395071ff22118311d434d697c2b6fd887b4",
        "platform/prebuilts/build-tools": "dc92e06585a7647bf739a2309a721b82fcfa01d4",
        "platform/prebuilts/clang-tools": "5611871963f54c688d3ac49e527aecdef21e8567",
        "platform/prebuilts/clang/host/linux-x86": "4f7e5adc160ab726ac5bafb260de98e612904c50",
        "platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8": "f7b0d5b0ee369864d5ac3e96ae24ec9e2b6a52da",
        "platform/prebuilts/jdk/jdk11": "491e6aa056676f29c4541f71bd738e4e876e4ba2",
        "platform/system/tools/mkbootimg": "2680066d0844544b3e78d6022cd21321d31837c3",
        "toolchain/prebuilts/ndk/r23": "19ac7e4eded12adb99d4f613490dde6dd0e72664"
    },
    "repo-init-branch": "common-android14-6.1",
    "repo-manifest": "kernel/manifest",
    "repo_manifest_file": "default.xml",
    "reset_image_build": false,
    "rollout": [],
    "src_ctrl": "repo",
    "sync_finish_time": 1681844162.2685213,
    "sync_start_time": 1681844077.0726051,
    "sync_succeed": 1,
    "target": {
        "apiary_target": "kernel_virt_x86_64",
        "dir_list": [
            "hci_vhci.ko",
            "modules.builtin",
            "usbip-core.ko",
            "btusb.ko",
            "gki-info.txt",
            "manifest_9964412.xml",
            "virt_wifi.ko",
            "mt76x2u.ko",
            "mac80211_hwsim.ko",
            "virtual_device_x86_64_modules",
            "repo.prop",
            "mt76x0-common.ko",
            "mt76-usb.ko",
            "virtio_pci.ko",
            "virtio_balloon.ko",
            "vmlinux.symvers",
            "mt76x2-common.ko",
            "gs_usb.ko",
            "mt76x0u.ko",
            "mt76.ko",
            "vhci-hcd.ko",
            "system_dlkm.modules.load",
            "virtio_pci_modern_dev.ko",
            "goldfish_pipe.ko",
            "vkms.ko",
            "virtio_snd.ko",
            "btintel.ko",
            "kernel_x86_64_modules",
            "modules.builtin.modinfo",
            "system_dlkm_staging_archive.tar.gz",
            "virtio_net.ko",
            "virtio_input.ko",
            "vmlinux",
            "system_heap.ko",
            "boot.img",
            "vmw_vsock_virtio_transport.ko",
            "goldfish_sync.ko",
            "System.map",
            "kernel-uapi-headers.tar.gz",
            "virtio-rng.ko",
            "mt76x02-usb.ko",
            "kernel-headers.tar.gz",
            "test_meminit.ko",
            "modules.load",
            "test_mappings.zip",
            "pulse8-cec.ko",
            "goldfish_address_space.ko",
            "multiple.intoto.jsonl",
            "initramfs.img",
            "rtc-test.ko",
            "dummy-cpufreq.ko",
            "virtio_pmem.ko",
            "virtio_pci_legacy_dev.ko",
            "virtio_console.ko",
            "btrtl.ko",
            "nd_virtio.ko",
            "applied.prop",
            "boot-img.tar.gz",
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