手动安装 kpatch 编译环境

published: updated: Linux 技巧(原创)

手动安装 kpatch 编译环境



1. 环境

  • Red Hat Enterprise Linux 7.6
  • 3.10.0-957.el7.x86_64
  • ccache-3.3.4-1.el7.x86_64.rpm


    2. 安装编译依赖的rpm 包

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    # yum install gcc kernel-devel-$(uname -r) elfutils elfutils-devel pesign yum-utils zlib-devel binutils-devel newt-devel python-devel perl-ExtUtils-Embed audit-libs-devel numactl-devel pciutils-devel bison ncurses-devel gcc-plugin-devel kernel-debuginfo kernel-debuginfo-common gcc-plugin-devel patchutils


    3. 创建 ccache， 可以优化编译的速度 （可选步骤，但是建议安装）

  • (ccache represents “compiler cache” which is a tool for the gcc compiler used to compile the same program over and over again with little downtime, While it may take a few seconds longer to compile a program the first time with ccache, subsequent compiles will be much, much faster.)

    3.1 安装ccache rpm 包

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    # yum install https://dl.fedoraproject.org/pub/epel/7/x86_64/Packages/c/ccache-3.3.4-1.el7.x86_64.rpm

    3.2 设置最大可用的cache 大小

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    # ccache --max-size=8G

    3.3 修改 gcc 别名，这样在调用gcc的时候就可以使用ccache了

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    # vi /etc/profile.d/gcc.sh
    alias gcc="ccache gcc"
    # source /etc/profile.d/gcc.sh


    4. 下载kpatch 源代码

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    # git clone https://github.com/dynup/kpatch.git


    5. 编译安装kpatch源代码

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    # make -j2 && make install
    make -C kpatch-build
    make -C kpatch
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/kpatch'
    make[1]: Nothing to be done for `all'.
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kpatch'
    make -C kmod
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/kpatch-build'
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o create-diff-object.o create-diff-object.c
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/kmod'
    make -C core clean
    make[2]: Entering directory `/mnt/kpatchDemoSam/kpatch/kmod/core'
    rm -f -Rf .*.o.cmd .*.ko.cmd .tmp_versions *.o *.ko *.mod.c \
    Module.symvers
    make[2]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kmod/core'
    make -C core
    make[2]: Entering directory `/mnt/kpatchDemoSam/kpatch/kmod/core'
    make -C /lib/modules/3.10.0-957.el7.x86_64/build M=/mnt/kpatchDemoSam/kpatch/kmod/core kpatch.ko
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o kpatch-elf.o kpatch-elf.c
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o lookup.o lookup.c
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o insn/insn.o insn/insn.c
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o insn/inat.o insn/inat.c
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o create-klp-module.o create-klp-module.c
    make[3]: Entering directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
    make[3]: warning: jobserver unavailable: using -j1.  Add `+' to parent make rule.
    gcc -MMD -MP -I../kmod/patch -Iinsn -Wall -Wsign-compare -g -Werror   -c -o create-kpatch-module.o create-kpatch-module.c
      CC [M]  /mnt/kpatchDemoSam/kpatch/kmod/core/core.o
    gcc   create-diff-object.o kpatch-elf.o lookup.o insn/insn.o insn/inat.o  -lelf -o create-diff-object
    gcc   create-klp-module.o kpatch-elf.o  -lelf -o create-klp-module
    gcc   create-kpatch-module.o kpatch-elf.o  -lelf -o create-kpatch-module
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kpatch-build'
    make -C man
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/man'
    gzip -c -9 kpatch.1 > kpatch.1.gz
    gzip -c -9 kpatch-build.1 > kpatch-build.1.gz
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/man'
    make -C contrib
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/contrib'
    make[1]: Nothing to be done for `all'.
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/contrib'
      CC [M]  /mnt/kpatchDemoSam/kpatch/kmod/core/shadow.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/kmod/core/kpatch.o
      MODPOST 1 modules
      CC      /mnt/kpatchDemoSam/kpatch/kmod/core/kpatch.mod.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/kmod/core/kpatch.ko
    make[3]: Leaving directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
    make[2]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kmod/core'
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kmod'
    make -C kpatch-build install
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/kpatch-build'
    /usr/bin/install -d /usr/local/libexec/kpatch
    /usr/bin/install create-diff-object create-klp-module create-kpatch-module kpatch-gcc /usr/local/libexec/kpatch
    /usr/bin/install -d /usr/local/bin
    /usr/bin/install kpatch-build /usr/local/bin
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kpatch-build'
    make -C kpatch install
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/kpatch'
    /usr/bin/install -d /usr/local/sbin
    /usr/bin/install kpatch /usr/local/sbin
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kpatch'
    make -C kmod install
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/kmod'
    /usr/bin/install -d /usr/local/lib/kpatch/3.10.0-957.el7.x86_64
    /usr/bin/install -m 644 core/kpatch.ko /usr/local/lib/kpatch/3.10.0-957.el7.x86_64
    /usr/bin/install -m 644 core/Module.symvers /usr/local/lib/kpatch/3.10.0-957.el7.x86_64
    /usr/bin/install -d /usr/local/share/kpatch/patch
    /usr/bin/install -m 644 patch/* /usr/local/share/kpatch/patch
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/kmod'
    make -C man install
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/man'
    /usr/bin/install -d /usr/local/share/man/man1
    /usr/bin/install -m 644 kpatch.1.gz /usr/local/share/man/man1
    /usr/bin/install -m 644 kpatch-build.1.gz /usr/local/share/man/man1
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/man'
    make -C contrib install
    make[1]: Entering directory `/mnt/kpatchDemoSam/kpatch/contrib'
    /usr/bin/install -d /usr/local/lib/systemd/system
    /usr/bin/install -m 0644 kpatch.service /usr/local/lib/systemd/system
    sed -i 's~PREFIX~/usr/local~' /usr/local/lib/systemd/system/kpatch.service
    /usr/bin/install -d /etc/init
    /usr/bin/install -m 0644 kpatch.conf /etc/init
    sed -i 's~PREFIX~/usr/local~' /etc/init/kpatch.conf
    make[1]: Leaving directory `/mnt/kpatchDemoSam/kpatch/contrib'


    6. 检查ccache是否正常工作

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    # ccache -s
    cache directory                     /root/.ccache
    primary config                      /root/.ccache/ccache.conf
    secondary config      (readonly)    /etc/ccache.conf
    cache hit (direct)                     0
    cache hit (preprocessed)               0
    cache miss                             2
    cache hit rate                      0.00 %
    called for link                        2
    called for preprocessing              16
    no input file                         75
    cleanups performed                     0
    files in cache                         4
    cache size                         733.2 kB
    max cache size                       5.0 GB


    7. 编译生成kpatch模块

  • 我已经提前修改了内核代码，所以就可以直接生成kpatch了
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    # ccache make -j2
    patch < patch
    patching file testmod_drv.c
    KCFLAGS="-ffunction-sections -fdata-sections" /usr/bin/make -C /lib/modules/3.10.0-957.el7.x86_64/build M=/mnt/kpatchDemoSam/kpatch/test/testmod testmod.ko
    make[1]: Entering directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
      CC [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod_drv.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.o
      MODPOST 1 modules
      CC      /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.mod.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.ko
    make[1]: Leaving directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
    strip --keep-file-symbols -d testmod_drv.o
    cp testmod_drv.o testmod_drv.o.patched
    patch -R < patch
    patching file testmod_drv.c
    KCFLAGS="-ffunction-sections -fdata-sections" /usr/bin/make -C /lib/modules/3.10.0-957.el7.x86_64/build M=/mnt/kpatchDemoSam/kpatch/test/testmod testmod.ko
    make[1]: Entering directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
      CC [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod_drv.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.o
      MODPOST 1 modules
      CC      /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.mod.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.ko
    make[1]: Leaving directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
    strip --keep-file-symbols -d testmod_drv.o
    cp testmod_drv.o testmod_drv.o.orig
    /usr/bin/make -C /lib/modules/3.10.0-957.el7.x86_64/build M=/mnt/kpatchDemoSam/kpatch/test/testmod clean
    make[1]: Entering directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
      CLEAN   /mnt/kpatchDemoSam/kpatch/test/testmod/.tmp_versions
      CLEAN   /mnt/kpatchDemoSam/kpatch/test/testmod/Module.symvers
    make[1]: Leaving directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
    /usr/bin/make -C /lib/modules/3.10.0-957.el7.x86_64/build M=/mnt/kpatchDemoSam/kpatch/test/testmod testmod.ko
    make[1]: Entering directory `/usr/src/kernels/3.10.0-957.el7.x86_64'
      CC [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod_drv.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.o
      MODPOST 1 modules
      CC      /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.mod.o
      LD [M]  /mnt/kpatchDemoSam/kpatch/test/testmod/testmod.ko
    make[1]: Leaving directory `/usr/src/kernels/3.10.0-957.el7.x86_64'


    8. 安装测试生成的kpatch模块

    8.1 确认已经生成

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    # ls *.ko
    testmod.ko

    8.2 安装kpatch模块

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    # kpatch install testmod.ko
    installing testmod.ko (3.10.0-957.el7.x86_64)
    Created symlink from /etc/systemd/system/multi-user.target.wants/kpatch.service to /usr/local/lib/systemd/system/kpatch.service.

    8.3 确认模块已经安装完毕

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    [root@vm2rhel76 (i_am_vm2_rhel76) testmod]# kpatch list
    Loaded patch modules:

    Installed patch modules:
    testmod (3.10.0-957.el7.x86_64)

    8.4 卸载kpatch模块

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    # kpatch uninstall testmod.ko
    uninstalling testmod.ko (3.10.0-957.el7.x86_64)

AckDo by Sam Lee