[PATCH for-5.1 0/3] virtiofsd: allow virtiofsd to run in a container

[Stefan Hajnoczi]

Container runtimes handle namespace setup and remove privileges needed by
virtiofsd to perform sandboxing. Luckily the container environment already
provides most of the sandbox that virtiofsd needs for security.

Introduce a new "virtiofsd -o chroot" option that uses chroot(2) instead of
namespaces. This option allows virtiofsd to work inside a container.

Please see the individual patches for details on the changes and security
implications.

Given that people are starting to attempt running virtiofsd in containers I
think this should go into QEMU 5.1.

Stefan Hajnoczi (3):
  virtiofsd: drop CAP_DAC_READ_SEARCH
  virtiofsd: add container-friendly -o chroot sandboxing option
  virtiofsd: probe unshare(CLONE_FS) and print an error

 tools/virtiofsd/fuse_virtio.c    | 13 +++++++++
 tools/virtiofsd/helper.c         |  3 +++
 tools/virtiofsd/passthrough_ll.c | 45 +++++++++++++++++++++++++++++---
 3 files changed, 58 insertions(+), 3 deletions(-)

-- 
2.26.2