[Qemu-devel] [Bug 1500265] [NEW] nested 9p filesystem with security_model=mapped-xattr

[Daniel Haid]

Public bug reported:

I do not know whether this is a bug or a feature request, but on a 9p
virtfs with security_model=mapped-xattr, access to extended attributes
starting with "user.virtfs" coming from the guest seem to be silently
ignored. Would it not be more correct to use some sort of "escaping",
say map to "user.virtfs.x" on guest to "user.virtfs.virtfs.x" on host or
something like that, so that the guest can use arbitrary attributes.

In particular, this would allow nested virtual machines to use nested 9p
virtfs with security_model=mapped-xattr.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1500265

Title:
  nested 9p filesystem with security_model=mapped-xattr

Status in QEMU:
  New

Bug description:
  I do not know whether this is a bug or a feature request, but on a 9p
  virtfs with security_model=mapped-xattr, access to extended attributes
  starting with "user.virtfs" coming from the guest seem to be silently
  ignored. Would it not be more correct to use some sort of "escaping",
  say map to "user.virtfs.x" on guest to "user.virtfs.virtfs.x" on host
  or something like that, so that the guest can use arbitrary
  attributes.

  In particular, this would allow nested virtual machines to use nested
  9p virtfs with security_model=mapped-xattr.

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