[Qemu-devel] [PATCH v4 0/3] 9pfs security fixes

[Greg Kurz]

As reported by Felix Wilhelm, at various places in 9pfs, full paths are
created by concatenating a guest originated string to the export path. A
malicious guest could forge a relative path and access files outside the
export path.

A tentative fix was sent recently by Prasad J Pandit, but it was only
focused on the local backend and did not get a positive review. This series
tries to address the issue more globally, based on the official 9P spec.

I wasn't running the TUXERA test suite correctly and overlooked a failure
with symbolic links (thanks Aneesh for your assistance). This v4 is basically
the same as v3 with a change in patch 1/3.

---

Greg Kurz (3):
      9pfs: forbid illegal path names
      9pfs: forbid . and .. in file names
      9pfs: handle walk of ".." in the root directory


 hw/9pfs/9p.c |  147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 hw/9pfs/9p.h |    1 
 2 files changed, 139 insertions(+), 9 deletions(-)

--
Greg