Tips For Dealing With Qemu Linux Kernel Debugging

Tips For Dealing With Qemu Linux Kernel Debugging

This user guide has been written to help you when you receive an error message related to qemu linux kernel debugging.

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    This is definitely very useful for quickly testing the Linux kernel Syntax: qemu-system-x86_64 BzImage -kernel -hda rootdisk.img -append “root=/dev/hda” Use -kernel to provide a Linux kernel image and -append to provide applicable kernel command-line arguments. The -initrd option can be used to mount an INITRD image.

    On this skills page, I’ll briefly talk about the best way to set up a debugging Linux kernel environment with GDB with Qemu and Qemu. Linux kernel Qemu’s functionality is virtualized.

    1. Create a Unix kernel for the Linux system you want to debug.
    2. Check this configuration. Set if config_debug_info=y is not just configured.
    3. You can build the kernel as et or rpm, install it on unusual servers. Use the commands: make bindep-pkg -j4, make rpm-pkg -j4. Bay (deb considers required alien package. Install with apt.)
    4. Install

    5. qemu. Contact the site manager.
    6. Configuration example: ./configure --target-list=x86_64-softmmu --enable-debug
    7. Install the virtual machine. (I installed 16 ubuntu.04 in the exercise.)
    8. Download the IE8.Qemu ISO file
    9. Create an img named “test.qcow2”: ./qemu-img create -f qcow2 test.qcow2 16G
    10. Start a VM with Ubuntu ISO: -m x86_64-softmmu/qemu-system-x86_64 2048 -enable-kvm If=virtio,file=test -drive.-cdrom qcow2,cache =none ubuntu - 04/16 5.iso
    11. You can :1 use -vnc when accessing remotely via ssh.
    12. After installing without VM option, run ~~--cdrom.iso.
    13. Replace the default kernel virtual machine with the version you created.
    14. Copy t into the VM files as dpkg sudo * -i.deb.
    15. Add nokaslr kernel options. This is necessary for the breakpoint to work correctly.
    16. Add nokaslr to GRUB_CMDLINE_LINUX_DEFAULT /etc/default/grub.
    17. Run update-grub
    18. Restart the virtual machine.file
    19. Create signatures from the vmlinux kernel image. vmlinux is treated as a file located in the kernel source directory (created by compilation) after.objcopy --only-keep-debug kernel vmlinux.sym
    20. How do I debug kernel QEMU?

      Create a Unix-like kernel that you really want to debug.tiredTell someone.Install the virtual machine.Replace the default kernel VM with whatever versions you create.Add kernel options to nokaslr.fileCreate an icon based on the vmlinux kernel image.usually run with qemu with the following options.Run gdb to load the symbol file and include it in qemu run die.

      Run qemu with the following options. -S stop gdb qemu timeout and call -s gdb to connect with localhost:1234.

      # Example of running qemu../x86_64-softmmu/qemu-x86_64-system -s -S n-m 2048n-chardev n-drive stdio,id=gdb0, if=virtio,file=nfstest.qcow2,cache=nonen-device isa-debugcon,iobase=0x402,chardev=gdb0,id=d1 n-vgan-enable-kvm virtion-VNK 1

      The: qemu no longer connects waiting for these debuggers.gdb,

    21. Run the problem icon file and attach it to the qemu launcher.

      gdb(gdb) file ./kernel.destination sym(gdb) away: 1234(gdb) start_kernel(go) hbreak with

      After sorting c qemu continues and breaks the breakpoint at start_kernel.

  • gdb is far from the source directory.
  • Use the dir /src/dir/path command. (Not verified.)
  • Changing the optimization options related to kernel compilation eliminates the dilemma when tracing code with gdb.

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  • Step 2: Launch the program and follow the on-screen instructions
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  • Set general options for -og files. As in the following example. Added

    How do I debug a Linux kernel module?

    To debug a module, of course, you must first load the module, then free GDB, where the symbol file often resides, then set the necessary breakpoints. So load the module type first. if they don't already exist.

    # for Mm/Makefile debugging.CFLAGS_ksm.o=-OgCFLAGS_huge_memory.o=-hugeCFLAGS_memory.o=-OgCFLAGS_migrate.o=-OgCFLAGS_page_alloc.o=-Og

  • https://wiki.osdev.org/Kernel_Debugging
  • https://gist.github.com/hngouveia01/843a2202628c7d567dad0f657f8373aa
  • sudo apt updatesudo suitable apt updatesudo select libncurses-dev flex bison openssl libssl-devn                  dkms libelf-dev libudev-dev libpci-devn                  autoconf Liberty-devsudo apt automatic removal
    cd linux-v.x.y root Linux source code directory number.do menu setup    # change the parameters and they will help keep the configuration with the default name;    # If you are going to use QEMU later, be sure to    Number read the following sentences.
    clearrm DebianRm -rf -f vmlinux-gdb.pymake -j$(nproc) LOCAVERSION=-some-suffix KDEB_PKGVERSION=1.some-suffix deb-pkg    # Is localversion my suffix to concatenate with the main kernel version    # - kdeb_pkgversion is the suffix for the built .deb -l package.
    dpkg | grep Linux image
    disclaimer sudo linux-image-v.x.y-suffixsudo apt free linux-image-vxy-suffix-dbg
    CD ..sudo dpkg -i linux-*.deb
    awk '$1=="menuentry -f' ' || $1=="submenu" print i++ Continuous: " /tItem $2; for each expression menu "t" i-1">"j++ ": '$2;' /load/grub/grub.cfg
    sudo vim /etc/default/grub    Change # the line directly, for example GRUB_DEFAULT="1>3"   Number If you need to add a number of command line options when starting up,    To do this, createThe number is given by adding the GRUB_CMDLINE_LINUX variable.sudo update-grub && sudo update-grub2
    sudo apt qemu configure qemu-system qemu-kvm libvirt-daemon-systemn                 Bridge Utilitiessudo libvirt-clients apt create gdb
    linux-v.x.y/arch/x86_64/boot/bzImage kernel binary image numberlinux-v.x.# specific Y/vmlinux target for GDBlinux-vxy/vmlinux-gdb.py#GDB

    qemu linux kernel debugging

    echo predefined utilities "add-auto-load-safe-path path/to/linux-v.x.y/vmlinux-gdb.py" >> ~/.gdbinit

    qemu linux kernel debugging

    git replication git://git.buildroot.net/buildroot
    cd buildrootdo menu setup    Please see the paragraphs for most of the required options listed below.
    sudo qemu-system-x86_64n -kernel linux-v.x.y/arch/x86_64/boot/bzImagen  -nographicn -drive format=raw,file=buildroot/output/images/rootfs.ext4,if=virtion  -add Console=ttyS0 "root=/dev/vda nokaslr other-paras-here-if-needed"n  -m 4G  -enable-kvmn  -Host CPUn  -smp $(nproc)n  -net nic, model=virtion -network user,hostfwd=tcp::10022-:22n -ersus -S

    How do I debug a running kernel?

    When debugging a kernel yourself, you can easily get the debug information built into a new kernel by setting CONFIG_DEBUG_INFO=y directly in the kernel configuration and running the assembler. debug information.

    sudo gdb linux-v.x.y/vmlinux(gdb) target remote:2345 # Hbreak qemu start_kernel(gdb) add(gdb) b mm_alloc(go) with(gdb) lx-dmesg Display # dmesg kernel symbol in GDB(gdb) shell...
    (in guest mode) expand "iface eth0 inet dhcp" >> /etc/network/interfaces(in guest) ifup eth0  # You may need this step  every time you start a guest
    (in guest) mire /etc/ssh/sshd_config   # Uncomment "PermitRootLogin" and set "yes";    Comment out the PermitEmptyPasswords number and set it to yes.(in guest) /etc/init.d/S50sshd reboot

    ssh -p 10022 [email protected]  # lowercase `p` for Ssh c c

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    Qemu 리눅스 커널 디버깅
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