Re: [Qemu-devel] [PATCH v2 0/4] 9pfs: local: fix metadata of mapped-file security mode

[Greg Kurz]

On Wed, 24 May 2017 00:59:29 +0200
Leo Gaspard <address@hidden> wrote:

> On 05/23/2017 04:32 PM, Greg Kurz wrote:
> > v2: - posted patch for CVE-2017-7493 separately
> >     - other changes available in each patch changelog
> > 
> > Leo,
> > 
> > If you find time to test this series, I'll gladly add your Tested-by: to
> > it before merging.  
> 
> Just tested with a base of 2.9.0 with patches [1] [2] (from my
> distribution), [3] (required to apply cleanly) and this patchset.
> 
> Things appear to work as expected, and .virtfs_metadata{,_root} appear
> to be neither readable nor writable by any user.
> 

Shall I add your Tested-by: to the patch then ?

> That said, one thing still bothering me with the fix in [3] is that it
> still "leaks" the host's uid/gid to the guest when a corresponding file
> in .virtfs_metadata is not present (while I'd have expected it to appear
> as root:root in the guest), but that's a separate issue, and I guess
> retro-compatibility prevents any fixing it.
> 

Heh, I had a tentative patch to create root:root credentials and 0700 mode
bits by default... but this could indeed break some setups, so I decided
not to post it.

> Thanks for these patches!

Thanks for the testing! :)

Cheers,

--
Greg

> Leo
> 
> 
> [1]
> https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/virtualization/qemu/force-uid0-on-9p.patch
> 
> [2]
> https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/virtualization/qemu/no-etc-install.patch
> 
> [3] https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg03663.html
>

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