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Initial commit of virtme.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
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commit 6fa0e038e87883eba18dd752ddc1332b30ea70c0 0 parents
Andrew Lutomirski authored
2  .gitignore
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+*~
+__pycache__
339 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. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
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+
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+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
44 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.
74 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)
82 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
54 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())
17 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 "$@"
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