AWSを触っていてちょっとAmazon Linuxのソースコードを見ようと思ってやり方を調べたときのメモ。
Amazon Linuxのカーネルのソースコード取得
ドキュメントやFAQを見るとCentOSと同じくyumdownloaderが使えて、そこからカーネルのソースを取得できるとのこと。
現在のカーネルのバージョンを確認。4.14.62-65.117だった。
$ rpm -qa | grep kernel kernel-4.14.62-65.117.amzn1.x86_64 kernel-tools-4.14.88-72.73.amzn1.x86_64
/tmpへ移動してyumdownloader でカーネルのソースRPMを取得。kernel-4.14.62-65.117.amzn1の指定は別になくても良い。
$ cd /tmp $ sudo yumdownloader --source kernel kernel-4.14.62-65.117.amzn1 Loaded plugins: priorities, update-motd, upgrade-helper Enabling amzn-updates-source repository Enabling amzn-main-source repository kernel-4.14.62-65.117.amzn1.src.rpm
RPMの中身を取得するために、まずはファイルを出力させるディレクトリを作成する。 そしてそのディレクトリへ移動する。
$ sudo mkdir -p /usr/src/kernels/4.14.62-65.117.amzn1 $ cd /usr/src/kernels/4.14.62-65.117.amzn1
rpm2cpioコマンドを使ってRPMからファイルを取得する。
$ sudo sh -c "rpm2cpio /tmp/kernel-4.14.62-65.117.amzn1.src.rpm | cpio -id"
以下のようなファイルが作成される。 パッチファイルがたくさんある...
$ ls 0001-kbuild-AFTER_LINK.patch 0045-x86-speculation-l1tf-Disallow-non-privileged-high-MM.patch 0089-x86-bugs-kvm-Introduce-boot-time-control-of-L1TF-mit.patch 0002-watchdog-Disable-watchdog-on-virtual-machines.patch 0046-x86-speculation-l1tf-Limit-swap-file-size-to-MAX_PA-.patch 0090-Documentation-Add-section-about-CPU-vulnerabilities.patch 0003-scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch 0047-x86-bugs-Move-the-l1tf-function-and-define-pr_fmt-pr.patch 0091-x86-KVM-VMX-Initialize-the-vmx_l1d_flush_pages-conte.patch 0004-bump-the-default-TTL-to-255.patch 0048-sched-smt-Update-sched_smt_present-at-runtime.patch 0092-Documentation-l1tf-Fix-typos.patch 0005-bump-default-tcp_wmem-from-16KB-to-20KB.patch 0049-x86-smp-Provide-topology_is_primary_thread.patch 0093-cpu-hotplug-detect-SMT-disabled-by-BIOS.patch 0006-force-perf-to-use-usr-bin-python-instead-of-usr-bin-.patch 0050-x86-topology-Provide-topology_smt_supported.patch 0094-x86-KVM-VMX-Don-t-set-l1tf_flush_l1d-to-true-from-vm.patch 0007-nvme-update-timeout-module-parameter-type.patch 0051-cpu-hotplug-Make-bringup-teardown-of-smp-threads-sym.patch 0095-x86-KVM-VMX-Replace-vmx_l1d_flush_always-with-vmx_l1.patch 0008-not-for-upstream-testmgr-config-changes-to-enable-FI.patch 0052-cpu-hotplug-Split-do_cpu_down.patch 0096-x86-KVM-VMX-Move-the-l1tf_flush_l1d-test-to-vmx_l1d_.patch 0009-drivers-introduce-AMAZON_DRIVER_UPDATES.patch 0053-cpu-hotplug-Provide-knobs-to-control-SMT.patch 0097-x86-irq-Demote-irq_cpustat_t-__softirq_pending-to-u1.patch 0010-drivers-amazon-add-network-device-drivers-support.patch 0054-x86-cpu-Remove-the-pointless-CPU-printout.patch 0098-x86-KVM-VMX-Introduce-per-host-cpu-analogue-of-l1tf_.patch 0011-drivers-amazon-introduce-AMAZON_ENA_ETHERNET.patch 0055-x86-cpu-AMD-Remove-the-pointless-detect_ht-call.patch 0099-x86-Don-t-include-linux-irq.h-from-asm-hardirq.h.patch 0012-Importing-Amazon-ENA-driver-1.5.0-into-amazon-4.14.y.patch 0056-x86-cpu-common-Provide-detect_ht_early.patch 0100-x86-irq-Let-interrupt-handlers-set-kvm_cpu_l1tf_flus.patch 0013-xen-manage-keep-track-of-the-on-going-suspend-mode.patch 0057-x86-cpu-topology-Provide-detect_extended_topology_ea.patch 0101-x86-KVM-VMX-Don-t-set-l1tf_flush_l1d-from-vmx_handle.patch 0014-xen-manage-introduce-helper-function-to-know-the-on-.patch 0058-x86-cpu-intel-Evaluate-smp_num_siblings-early.patch 0102-Documentation-l1tf-Remove-Yonah-processors-from-not-.patch 0015-xenbus-add-freeze-thaw-restore-callbacks-support.patch 0059-x86-CPU-AMD-Do-not-check-CPUID-max-ext-level-before-.patch 0103-KVM-x86-Add-a-framework-for-supporting-MSR-based-fea.patch 0016-x86-xen-Introduce-new-function-to-map-HYPERVISOR_sha.patch 0060-x86-cpu-AMD-Evaluate-smp_num_siblings-early.patch 0104-KVM-SVM-Add-MSR-based-feature-support-for-serializin.patch 0017-x86-xen-add-system-core-suspend-and-resume-callbacks.patch 0061-x86-apic-Ignore-secondary-threads-if-nosmt-force.patch 0105-KVM-X86-Introduce-kvm_get_msr_feature.patch 0018-xen-blkfront-add-callbacks-for-PM-suspend-and-hibern.patch 0062-x86-speculation-l1tf-Extend-64bit-swap-file-size-lim.patch 0106-KVM-X86-Allow-userspace-to-define-the-microcode-vers.patch 0019-xen-netfront-add-callbacks-for-PM-suspend-and-hibern.patch 0063-x86-cpufeatures-Add-detection-of-L1D-cache-flush-sup.patch 0107-KVM-VMX-support-MSR_IA32_ARCH_CAPABILITIES-as-a-feat.patch 0020-xen-time-introduce-xen_-save-restore-_steal_clock.patch 0064-x86-CPU-AMD-Move-TOPOEXT-reenablement-before-reading.patch 0108-x86-speculation-Simplify-sysfs-report-of-VMX-L1TF-vu.patch 0021-x86-xen-save-and-restore-steal-clock.patch 0065-x86-speculation-l1tf-Protect-PAE-swap-entries-agains.patch 0109-x86-speculation-Use-ARCH_CAPABILITIES-to-skip-L1D-fl.patch 0022-xen-events-add-xen_shutdown_pirqs-helper-function.patch 0066-x86-speculation-l1tf-Fix-up-pte-pfn-conversion-for-P.patch 0110-KVM-VMX-Tell-the-nested-hypervisor-to-skip-L1D-flush.patch 0023-x86-xen-close-event-channels-for-PIRQs-in-system-cor.patch 0067-Revert-x86-apic-Ignore-secondary-threads-if-nosmt-fo.patch 0111-cpu-hotplug-Fix-SMT-supported-evaluation.patch 0024-PM-hibernate-update-the-resume-offset-on-SNAPSHOT_SE.patch 0068-cpu-hotplug-Boot-HT-siblings-at-least-once.patch 0112-x86-speculation-l1tf-Invert-all-not-present-mappings.patch 0025-Not-for-upstream-PM-hibernate-Speed-up-hibernation-b.patch 0069-x86-KVM-Warn-user-if-KVM-is-loaded-SMT-and-L1TF-CPU-.patch 0113-x86-speculation-l1tf-Make-pmd-pud_mknotpresent-inver.patch 0026-xen-blkfront-resurrect-request-based-mode.patch 0070-x86-KVM-VMX-Add-module-argument-for-L1TF-mitigation.patch 0114-x86-mm-pat-Make-set_memory_np-L1TF-safe.patch 0027-xen-blkfront-add-persistent_grants-parameter.patch 0071-x86-KVM-VMX-Add-L1D-flush-algorithm.patch 0115-x86-mm-kmmio-Make-the-tracer-robust-against-L1TF.patch 0028-ACPI-SPCR-Make-SPCR-available-to-x86.patch 0072-x86-KVM-VMX-Add-L1D-MSR-based-flush.patch 0116-tools-headers-Synchronise-x86-cpufeatures.h-for-L1TF.patch 0029-Revert-xen-dont-fiddle-with-event-channel-masking-in.patch 0073-x86-KVM-VMX-Add-L1D-flush-logic.patch config-generic 0030-locking-paravirt-Use-new-static-key-for-controlling-.patch 0074-x86-KVM-VMX-Split-the-VMX-MSR-LOAD-structures-to-hav.patch config-x86_32-generic 0031-KVM-Introduce-paravirtualization-hints-and-KVM_HINTS.patch 0075-x86-KVM-VMX-Add-find_msr-helper-function.patch config-x86_64-generic 0032-KVM-X86-Choose-qspinlock-when-dedicated-physical-CPU.patch 0076-x86-KVM-VMX-Separate-the-VMX-AUTOLOAD-guest-host-num.patch cpupower.config 0033-x86-paravirt-Set-up-the-virt_spin_lock_key-after-sta.patch 0077-x86-KVM-VMX-Extend-add_atomic_switch_msr-to-allow-VM.patch cpupower.init 0034-KVM-X86-Fix-setup-the-virt_spin_lock_key-before-stat.patch 0078-x86-KVM-VMX-Use-MSR-save-list-for-IA32_FLUSH_CMD-if-.patch kconfig.py 0035-xen-blkfront-Fixed-blkfront_restore-to-remove-a-call.patch 0079-cpu-hotplug-Online-siblings-when-SMT-control-is-turn.patch kernel.spec 0036-xen-netfront-Update-features-after-registering-netde.patch 0080-x86-litf-Introduce-vmx-status-variable.patch linux-4.14.62-patches.tar 0037-x86-tsc-avoid-system-instability-in-hibernation.patch 0081-x86-kvm-Drop-L1TF-MSR-list-approach.patch linux-4.14.62.tar 0038-blk-mq-simplify-queue-mapping-schedule-with-each-pos.patch 0082-x86-l1tf-Handle-EPT-disabled-state-proper.patch Makefile.config 0039-x86-speculation-l1tf-Increase-32bit-PAE-__PHYSICAL_P.patch 0083-x86-kvm-Move-l1tf-setup-function.patch mod-extra.list 0040-x86-speculation-l1tf-Change-order-of-offset-type-in-.patch 0084-x86-kvm-Add-static-key-for-flush-always.patch mod-extra.sh 0041-x86-speculation-l1tf-Protect-swap-entries-against-L1.patch 0085-x86-kvm-Serialize-L1D-flush-parameter-setter.patch mod-extra-sign.sh 0042-x86-speculation-l1tf-Protect-PROT_NONE-PTEs-against-.patch 0086-x86-kvm-Allow-runtime-control-of-L1D-flush.patch split-man.pl 0043-x86-speculation-l1tf-Make-sure-the-first-page-is-alw.patch 0087-cpu-hotplug-Expose-SMT-control-init-function.patch x509.genkey 0044-x86-speculation-l1tf-Add-sysfs-reporting-for-l1tf.patch 0088-cpu-hotplug-Set-CPU_SMT_NOT_SUPPORTED-early.patch
linux-4.14.62.tarを展開すればソースを参照できるようになる。
$ sudo tar -xf linux-4.14.62.tar
$ cd linux-4.14.62 $ ls -lth total 720K drwxrwxr-x 32 root root 4.0K Aug 9 10:16 arch drwxrwxr-x 3 root root 4.0K Aug 9 10:16 block drwxrwxr-x 2 root root 4.0K Aug 9 10:16 certs -rw-rw-r-- 1 root root 19K Aug 9 10:16 COPYING -rw-rw-r-- 1 root root 97K Aug 9 10:16 CREDITS drwxrwxr-x 4 root root 4.0K Aug 9 10:16 crypto drwxrwxr-x 121 root root 12K Aug 9 10:16 Documentation drwxrwxr-x 131 root root 4.0K Aug 9 10:16 drivers drwxrwxr-x 2 root root 4.0K Aug 9 10:16 firmware drwxrwxr-x 74 root root 4.0K Aug 9 10:16 fs drwxrwxr-x 27 root root 4.0K Aug 9 10:16 include drwxrwxr-x 2 root root 4.0K Aug 9 10:16 init drwxrwxr-x 2 root root 4.0K Aug 9 10:16 ipc -rw-rw-r-- 1 root root 2.3K Aug 9 10:16 Kbuild -rw-rw-r-- 1 root root 287 Aug 9 10:16 Kconfig drwxrwxr-x 17 root root 4.0K Aug 9 10:16 kernel drwxrwxr-x 13 root root 12K Aug 9 10:16 lib -rw-rw-r-- 1 root root 421K Aug 9 10:16 MAINTAINERS -rw-rw-r-- 1 root root 60K Aug 9 10:16 Makefile drwxrwxr-x 3 root root 4.0K Aug 9 10:16 mm drwxrwxr-x 69 root root 4.0K Aug 9 10:16 net -rw-rw-r-- 1 root root 722 Aug 9 10:16 README drwxrwxr-x 28 root root 4.0K Aug 9 10:16 samples drwxrwxr-x 14 root root 4.0K Aug 9 10:16 scripts drwxrwxr-x 10 root root 4.0K Aug 9 10:16 security drwxrwxr-x 24 root root 4.0K Aug 9 10:16 sound drwxrwxr-x 30 root root 4.0K Aug 9 10:16 tools drwxrwxr-x 2 root root 4.0K Aug 9 10:16 usr drwxrwxr-x 4 root root 4.0K Aug 9 10:16 virt
まとめ
Amazon Linuxのカーネルのソースコードを取得してみた。 いろんなパッチが当てられていていろいろカスタマイズされているらしいというのはわかった。
