1#!/bin/bash 2# The following is a synthesis of info in: 3# 4# http://vmsplice.net/~stefan/stefanha-kernel-recipes-2015.pdf 5# http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/README 6# 7KBASE=../../linux 8#APPEND="console=ttyS0" 9 10function die { 11 echo "$*" 12 exit 1 13} 14 15pushd .. 16make || die "failed to make libcap tree" 17popd 18 19# Assumes desired make *config (eg. make defconfig) is already done. 20pushd $KBASE 21pwd 22make V=1 all || die "failed to build kernel: $0" 23popd 24 25HERE=$(/bin/pwd) 26 27cat > fs.conf <<EOF 28file /init test-init.sh 0755 0 0 29dir /etc 0755 0 0 30file /etc/passwd test-passwd 0444 0 0 31dir /lib 0755 0 0 32dir /proc 0755 0 0 33dir /dev 0755 0 0 34dir /sys 0755 0 0 35dir /sbin 0755 0 0 36file /sbin/busybox /usr/sbin/busybox 0755 0 0 37dir /bin 0755 0 0 38file /bin/myprompt test-prompt.sh 0755 0 0 39file /bin/bash test-bash.sh 0755 0 0 40dir /usr 0755 0 0 41dir /usr/bin 0755 0 0 42dir /root 0755 0 0 43file /root/quicktest.sh $HERE/../progs/quicktest.sh 0755 0 0 44file /root/setcap $HERE/../progs/setcap 0755 0 0 45file /root/getcap $HERE/../progs/getcap 0755 0 0 46file /root/capsh $HERE/../progs/capsh 0755 0 0 47file /root/getpcaps $HERE/../progs/getpcaps 0755 0 0 48EOF 49 50COMMANDS="ls ln cp id pwd mkdir rmdir cat rm sh mount umount chmod less" 51for f in $COMMANDS; do 52 echo slink /bin/$f /sbin/busybox 0755 0 0 >> fs.conf 53done 54 55UCOMMANDS="id cut" 56for f in $UCOMMANDS; do 57 echo slink /usr/bin/$f /sbin/busybox 0755 0 0 >> fs.conf 58done 59 60$KBASE/usr/gen_init_cpio fs.conf | gzip -9 > initramfs.img 61 62KERNEL=$KBASE/arch/x86_64/boot/bzImage 63 64qemu-system-$(uname -m) -m 1024 \ 65 -kernel $KERNEL \ 66 -initrd initramfs.img \ 67 -append "$APPEND" 68