From 6fa0e038e87883eba18dd752ddc1332b30ea70c0 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Thu, 6 Feb 2014 09:23:30 -0800 Subject: [PATCH] Initial commit of virtme. Signed-off-by: Andy Lutomirski --- .gitignore | 2 + LICENSE | 339 +++++++++++++++++++++++++++++++++++++++++++++ README.md | 44 ++++++ cpiowriter.py | 74 ++++++++++ virtme-init | 82 +++++++++++ virtme-mkinitramfs | 54 ++++++++ virtme-runkernel | 17 +++ 7 files changed, 612 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 README.md create mode 100755 cpiowriter.py create mode 100755 virtme-init create mode 100755 virtme-mkinitramfs create mode 100755 virtme-runkernel diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..9b5e2e8 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +*~ +__pycache__ diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..355fd35 --- /dev/null +++ b/README.md @@ -0,0 +1,44 @@ +What is virtme? +=============== + +Virtme is a set of simple tools to run a virtualized Linux kernel that +uses the host Linux distribution instead of a separate image. + +Virtme is tiny, easy to use, and makes testing kernel changes quite simple. + +Some day this might be useful as a sort of sandbox. Right now it's not +really configurable enough for that. + +How to use virtme +================= + +You'll need a Linux kernel compiled with these options: + + CONFIG_VIRTIO=y + CONFIG_VIRTIO_PCI=y + CONFIG_NET_9P=y + CONFIG_NET_9P_VIRTIO=y + CONFIG_9P_FS=y + + +Virtme does not (yet) support modular virtio or 9p, so you can't use your +distro kernel. Fixing this is a high priority. + +Once you have such a kernel, run: + + virtme-runkernel PATH_TO_BZIMAGE + +On x86, you can usually find a bzImage in `arch/x86/boot/bzImage` once you've +compiled your kernel. To save time (since modules aren't supported yet), +build your kernel with `make bzImage`. + +You can then do things like `cd /home/username` and you will have readonly +access to all your files. + +Upcoming features +================= + +In the near term, the high-priority features are: + +* Support for modular virtfs and 9p. +* Some way to configure writable mounts. \ No newline at end of file diff --git a/cpiowriter.py b/cpiowriter.py new file mode 100755 index 0000000..ad82261 --- /dev/null +++ b/cpiowriter.py @@ -0,0 +1,74 @@ +#!/usr/bin/python3 +# -*- mode: python -*- +import sys + +class CpioWriter(object): + TYPE_DIR = 0o0040000 + TYPE_REG = 0o0100000 + TYPE_SYMLINK = 0o0120000 + TYPE_MASK = 0o0170000 + + def __init__(self, f): + self.__f = f + self.__totalsize = 0 + self.__next_ino = 0 + + def __write(self, data): + self.__f.write(data) + self.__totalsize += len(data) + + def write_object(self, name, body, mode, ino=None, nlink=None, + uid=0, gid=0, mtime=0, devmajor=0, devminor=0, + rdevmajor=0, rdevminor=0): + if nlink is None: + nlink = (2 if (mode & CpioWriter.TYPE_MASK) == CpioWriter.TYPE_DIR + else 1) + + if b'\0' in name: + raise ValueError('Filename cannot contain a NUL') + + namesize = len(name) + 1 + + if isinstance(body, bytes): + filesize = len(body) + else: + filesize = body.seek(0, 2) + body.seek(0) + + if ino is None: + ino = self.__next_ino + self.__next_ino += 1 + + fields = [ino, mode, uid, gid, nlink, mtime, filesize, + devmajor, devminor, rdevmajor, rdevminor, namesize, 0] + hdr = ('070701' + ''.join('%08X' % f for f in fields)).encode('ascii') + + self.__write(hdr) + self.__write(name) + self.__write(b'\0') + self.__write(((2-namesize) % 4) * b'\0') + + if isinstance(body, bytes): + self.__write(body) + else: + while True: + buf = body.read(65536) + if buf == b'': + break + self.__write(buf) + + self.__write(((-filesize) % 4) * b'\0') + + def write_trailer(self): + self.write_object(name=b'TRAILER!!!', body=b'', mode=0, ino=0, nlink=1) + self.__write(((-self.__totalsize) % 512) * b'\0') + + def mkdir(self, name, mode): + self.write_object(name=name, mode=CpioWriter.TYPE_DIR | mode, body=b'') + + def symlink(self, src, dst): + self.write_object(name=dst, mode=CpioWriter.TYPE_SYMLINK | 0o777, + body=src) + + def write_file(self, name, body, mode): + self.write_object(name=name, body=body, mode=CpioWriter.TYPE_REG | mode) diff --git a/virtme-init b/virtme-init new file mode 100755 index 0000000..f83e9d2 --- /dev/null +++ b/virtme-init @@ -0,0 +1,82 @@ +#!/bin/sh +# virtme-init: virtme's basic init (PID 1) process +# Copyright © 2013 Andy Lutomirski +# Licensed under the GPLv2, which is available in the virtme distribution +# as a file called LICENSE with SHA-256 hash: +# 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643 + +export PATH=/bin:/sbin:/usr/bin:/usr/sbin +export TERM=linux + +# Set up a minimally functional system +mount -t proc -o nosuid,noexec,nodev /proc/ +mount -t sysfs -o nosuid,noexec,nodev /sys/ + +mount -t tmpfs tmpfs /tmp/ +mount -t tmpfs tmpfs /run/ + +# Find udevd +if [[ -x /usr/lib/systemd/systemd-udevd ]]; then + udevd=/usr/lib/systemd/systemd-udevd +else + udevd=`which udevd` +fi + +# Ideally we'll use devtmpfs +if mount -t devtmpfs -o mode=0755,nosuid,noexec none /dev &>/dev/null; then + "$udevd" --daemon --resolve-names=never +else + # The running kernel doesn't have devtmpfs. Use regular tmpfs. + mount -t tmpfs -o mode=0755,nosuid,noexec none /dev + + # Make some basic devices first, let udev handle the rest + mknod -m 0666 /dev/null c 1 3 + mknod -m 0660 /dev/kmsg c 1 11 + mknod -m 0600 /dev/console c 5 1 + + # Try to get udevd to coldplug everything + "$udevd" --daemon --resolve-names=never + udevadm trigger --action=add >/dev/null 2>&1 + udevadm settle +fi + +mkdir -p -m 0755 /dev/shm /dev/pts +mount -t devpts -o gid=tty,mode=620,noexec,nosuid devpts /dev/pts +mount -t tmpfs -o mode=1777,nosuid,nodev tmpfs /dev/shm + +# Bring up networking +ip link set dev lo up + +# Create some VTs +deallocvt +openvt -c 2 -- /bin/bash +openvt -c 3 -- /bin/bash +openvt -c 4 -- /bin/bash + +# Figure out what the main console is +consdev="`grep ' ... (.C' /proc/consoles |cut -d' ' -f1`" +if [[ -z "$consdev" ]]; then + echo "Can't deduce console device" >&2 + exec bash --login # At least try to be helpful +fi +if [[ "$consdev" == "tty0" ]]; then + consdev=tty1 # sigh +fi +if [[ ! -e "/dev/$consdev" ]]; then + echo "/dev/$consdev doesn't exist." + exec bash --login +fi + +echo "virtme-init: console is $consdev" + +# Bring up a functioning shell on the console. This is a bit magical: +# We have no controlling terminal because we're attached to a fake +# console device (probably something like /dev/console), which can't +# be a controlling terminal. We are also not a member of a session. +# Init apparently can't setsid (whether that's a limitation of the +# setsid binary or the system call, I don't know). +while true; do + setsid bash 0<>"/dev/$consdev" 1>&0 2>&0 + echo "Shell died. Will respawn." + sleep 0.5 +done diff --git a/virtme-mkinitramfs b/virtme-mkinitramfs new file mode 100755 index 0000000..96d47bf --- /dev/null +++ b/virtme-mkinitramfs @@ -0,0 +1,54 @@ +#!/usr/bin/python3 +# -*- mode: python -*- +# virtme-mkinitramfs: Generate an initramfs image for virtme +# Copyright © 2013 Andy Lutomirski +# Licensed under the GPLv2, which is available in the virtme distribution +# as a file called LICENSE with SHA-256 hash: +# 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643 + +import argparse +import shutil +import cpiowriter +import inspect +import io +import os.path +import shlex + +def make_base_layout(cw): + for dir in (b'lib', b'bin', b'var', b'etc', b'newroot'): + cw.mkdir(dir, 0o755) + + cw.symlink(b'bin', b'sbin') + cw.symlink(b'lib', b'lib64') + +def install_busybox(cw): + bbpath = shutil.which('busybox') + with open(bbpath, 'rb') as busybox: + cw.write_file(name=b'bin/busybox', body=busybox, mode=0o755) + + for tool in ('sh', 'mount', 'umount', 'modprobe', 'switch_root'): + cw.symlink(b'busybox', ('bin/%s' % tool).encode('ascii')) + +def generate_init(): + mypath = os.path.dirname(os.path.abspath( + inspect.getfile(inspect.currentframe()))) + + out = io.StringIO() + out.write('#!/bin/sh\n') + out.write('echo \'Mounting hostfs...\'\n') + out.write('/bin/mount -t 9p -o ro,version=9p2000.L,trans=virtio,access=any hostroot /newroot/\n') + + out.write('exec /bin/switch_root /newroot %s\n' % shlex.quote(os.path.join(mypath, 'virtme-init'))) + return out.getvalue().encode('utf-8') + +def main(): + import sys + cw = cpiowriter.CpioWriter(sys.stdout.buffer) + make_base_layout(cw) + install_busybox(cw) + cw.write_file(b'init', body=generate_init(), mode=0o755) + cw.write_trailer() + return 0 + +if __name__ == '__main__': + exit(main()) diff --git a/virtme-runkernel b/virtme-runkernel new file mode 100755 index 0000000..764c6dd --- /dev/null +++ b/virtme-runkernel @@ -0,0 +1,17 @@ +#!/bin/bash +# virtme-runkernel: A silly script to run a kernel image +# Copyright © 2013 Andy Lutomirski +# Licensed under the GPLv2, which is available in the virtme distribution +# as a file called LICENSE with SHA-256 hash: +# 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643 + +# This is a giant hack. I'll make it better at some point. + +tmpfile="`mktemp --tmpdir initramfs.XXXXXXXXXX`" +exec 3<>"$tmpfile" +rm "$tmpfile" + +v_mki="$(dirname $0)/virtme-mkinitramfs" +"$v_mki" >&3 + +exec qemu-kvm -virtfs local,id=rootfs,path=/,security_model=passthrough,mount_tag=hostroot,readonly -initrd /proc/self/fd/3 -kernel "$@"