device: 0.795
performance: 0.680
graphic: 0.632
ppc: 0.628
network: 0.493
PID: 0.475
boot: 0.421
virtual: 0.419
architecture: 0.413
kernel: 0.392
user-level: 0.386
x86: 0.366
vnc: 0.358
mistranslation: 0.356
hypervisor: 0.338
i386: 0.333
debug: 0.330
semantic: 0.328
assembly: 0.320
permissions: 0.288
TCG: 0.274
arm: 0.267
risc-v: 0.257
register: 0.235
socket: 0.212
peripherals: 0.212
VMM: 0.203
files: 0.172
KVM: 0.171

unable to read symlinks when mounting 9p filesystem with security_model=mapped

I am trying to use clang that is mounted from a 9p filesystem that has the options 
 -fsdev local,id=virtfs3,path=/clang,security_model=mapped-file -device virtio-9p-pci,fsdev=virtfs3,mount_tag=clang

clang has symlinks to clang-9. eg /clang/clang/bin/clang is a symlink that points to clang-9 in the current directory. 

the clang filesystem is on a bind mount point on /clang/clang on the host and this is mapped to the same place on the guest. If I have the same virtfs mount point with the security_model=none I don't have this problem.

On the host: readlink clang
clang-9

and guest:

ls: cannot read symbolic link 'clang': No such file or directory
lrwxrwxrwx 1 root root 7 May 30 02:21 clang

readlink clang

returns nothing.


This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/173