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Re: [Xen-devel] [PATCH v2 3/6] tools/dm_restrict: Ask QEMU to chroot
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 24 Sep 2018 10:50:17 +0100
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- Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- Delivery-date: Mon, 24 Sep 2018 09:50:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 09/24/2018 09:20 AM, Paul Durrant wrote:
>> -----Original Message-----
>> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf
>> Of George Dunlap
>> Sent: 21 September 2018 18:04
>> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
>> Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>; Ian Jackson
>> <Ian.Jackson@xxxxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>; George Dunlap
>> <George.Dunlap@xxxxxxxxxx>
>> Subject: [Xen-devel] [PATCH v2 3/6] tools/dm_restrict: Ask QEMU to chroot
>>
>> When dm_restrict is enabled, ask QEMU to chroot into an empty directory.
>>
>> * Create /var/run/qemu/root-domid (deleting the old one if it's there)
>> * Pass the -chroot option to QEMU
>>
>> Rather than running `rm -rf` on the directory before creating it
>> (since there is no library function to do this), simply rmdir the
>> directory, relying on the fact that the previous QEMU instance, if
>> properly restcirted, shouldn't have been able to write anything
>
> ^ typo... 'restricted'
Oops -- fixed, thanks.
>> diff --git a/docs/designs/qemu-deprivilege.md b/docs/designs/qemu-
>> deprivilege.md
>> index 1e731c16aa..df5bb07d7c 100644
>> --- a/docs/designs/qemu-deprivilege.md
>> +++ b/docs/designs/qemu-deprivilege.md
>> @@ -58,12 +58,6 @@ FIXME: Double-check the correctness of the above
>>
>> '''Testing status''': Tested
>>
>> -# Restrictions / improvements still to do
>> -
>> -This lists potential restrictions still to do. It is meant to be
>> -listed in order of ease of implementation, with low-hanging fruit
>> -first.
>> -
>> ## Chroot
>>
>> '''Description''': Qemu runs in its own chroot, such that even if it
>> @@ -81,6 +75,12 @@ Then adds the following to the qemu command-line:
>>
>> '''Tested''': Not tested
>
> ^ should this change to 'tested' now?
I sort of went back and forth here between whether this should mean 'a
test it available' (i.e., depriv-process-checker.sh checks it) and 'this
is actively being tested' (i.e., by osstest). Here I ended up going
with the second option, but that makes a weird dependency between
xen.git and osstest.
One option, I suppose, would be to change this to "Test implemented" or
something.
-George
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