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Os boot issues on 9p filesystem due to unix domain sockets open failure
Description of problem:
Unix filesystem API is broken, unix domain socket special files return an error at open()
Steps to reproduce:
Simple script. Tries to use netcat to get data through a local unix domain socket file
```
#!/bin/bash
# Cleanup target dir
[ -d ./target ] && rm -rf target
mkdir target
# Add configuration updates
mkdir -p ./target/etc/initramfs-tools/
echo 9p >> ./target/etc/initramfs-tools/modules
echo 9pnet_virtio >> ./target/etc/initramfs-tools/modules
# Add the test script
cat > ./target/test_init << EOF
#!/bin/bash
echo "Test for unix domain sockets"
nc -Ul /socket &
sleep 1
echo "Sockets work" | nc -UN /socket || echo "Sockets fail"
echo o > /proc/sysrq-trigger
sleep 999
EOF
chmod 700 ./target/test_init
# Create an Ubuntu 23.10 around it
echo "Creating Ubuntu target OS"
debootstrap --variant=minbase\
--include=udev,kmod,initramfs-tools,systemd,netcat-openbsd,linux-image-generic \
--exclude=man,bash-completion \
mantic ./target > /dev/null || exit 1
# Run the test in 9p forwarded filesystem
echo "Running OS in qemu"
qemu-system-s390x \
-m 8192 \
-smp 4 \
-nodefaults -nographic -no-reboot -no-user-config \
-kernel ./target/boot/vmlinuz \
-initrd ./target/boot/initrd.img \
-append 'root=fsRoot rw rootfstype=9p rootflags=trans=virtio,version=9p2000.L,msize=512000,cache=mmap,posixacl console=ttysclp0 init=/test_init quiet' \
-fsdev local,security_model=passthrough,multidevs=remap,id=fsdev-fsRoot,path=./target \
-device virtio-9p-pci,id=fsRoot,fsdev=fsdev-fsRoot,mount_tag=fsRoot \
-device virtio-serial-ccw -device sclpconsole,chardev=console \
-chardev stdio,id=console,signal=off
```
Additional information:
Test output:
```
Test for unix domain sockets
qemu-system-s390x: 9p: broken or compromised client detected; attempt to open special file (i.e. neither regular file, nor directory)
nc: No such device or address
nc: /socket: No such file or directory
Sockets fail
```
|