On 07/30/2015 04:05 PM, Andy Lutomirski wrote:
On Thu, Jul 30, 2015 at 1:01 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/30/2015 02:54 PM, Andrew Cooper wrote:
On 30/07/15 19:30, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 5:29 PM, Andrew Cooper
andrew.coop...@citrix.com
On 07/30/2015 02:54 PM, Andrew Cooper wrote:
On 30/07/15 19:30, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 5:29 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 30/07/2015 00:13, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 4:02 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On Thu, Jul 30, 2015 at 1:01 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/30/2015 02:54 PM, Andrew Cooper wrote:
On 30/07/15 19:30, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 5:29 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 30/07/2015 00:13, Andy Lutomirski
On Wed, Jul 29, 2015 at 5:29 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 30/07/2015 00:13, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 4:02 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 23:49, Boris Ostrovsky wrote:
On 07/29/2015 06:46 PM, David Vrabel wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/29/2015 03:03 PM, Andrew Cooper
On 07/29/2015 06:11 PM, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com
On 07/29/2015 03:03 PM, Andrew Cooper wrote:
On 29/07/15 15:43, Boris Ostrovsky wrote:
FYI, I have got a repro now and am investigating.
Good and bad news. This bug has nothing to do with LDTs themselves.
I have worked out what is going on, but this:
diff --git a/arch/x86/xen/enlighten.c
On 07/29/2015 05:26 PM, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/29/2015 03:03 PM, Andrew Cooper wrote:
On 29/07/15 15:43, Boris Ostrovsky wrote:
FYI, I have got a repro now and am investigating.
Good and bad news. This
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/29/2015 03:03 PM, Andrew Cooper wrote:
On 29/07/15 15:43, Boris Ostrovsky wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/29/2015 03:03 PM, Andrew Cooper wrote:
On 29/07/15 15:43, Boris Ostrovsky wrote:
FYI, I have got a repro now and am investigating.
Good and bad news. This bug has nothing to do with LDTs themselves.
On 29/07/2015 22:26, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/29/2015 03:03 PM, Andrew Cooper wrote:
On 29/07/15 15:43, Boris Ostrovsky wrote:
FYI, I have got a repro now and am investigating.
Good and bad news. This bug
On 29/07/15 15:43, Boris Ostrovsky wrote:
FYI, I have got a repro now and am investigating.
Good and bad news. This bug has nothing to do with LDTs themselves.
I have worked out what is going on, but this:
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 5abeaac..7e1a82e
On 29/07/2015 23:49, Boris Ostrovsky wrote:
On 07/29/2015 06:46 PM, David Vrabel wrote:
On 29/07/2015 23:11, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy
On 29/07/2015 23:49, Boris Ostrovsky wrote:
On 07/29/2015 06:46 PM, David Vrabel wrote:
On 29/07/2015 23:11, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy Lutomirski
On 07/29/2015 06:46 PM, David Vrabel wrote:
On 29/07/2015 23:11, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM,
On 30/07/2015 00:13, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 4:02 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 23:49, Boris Ostrovsky wrote:
On 07/29/2015 06:46 PM, David Vrabel wrote:
On 29/07/2015 23:11, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski
On 29/07/2015 23:11, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 22:26, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:23 PM, Boris Ostrovsky
boris.ostrov...@oracle.com
On Wed, Jul 29, 2015 at 4:02 PM, Andrew Cooper
andrew.coop...@citrix.com wrote:
On 29/07/2015 23:49, Boris Ostrovsky wrote:
On 07/29/2015 06:46 PM, David Vrabel wrote:
On 29/07/2015 23:11, Andrew Cooper wrote:
On 29/07/2015 23:05, Andy Lutomirski wrote:
On Wed, Jul 29, 2015 at 2:37 PM,
On 07/29/2015 10:21 AM, Andrew Cooper wrote:
On 29/07/15 06:28, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 8:01 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/28/2015 08:47 PM, Andrew Cooper wrote:
On 29/07/2015 01:21, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 10:10 AM,
On 29/07/15 06:28, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 8:01 PM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/28/2015 08:47 PM, Andrew Cooper wrote:
On 29/07/2015 01:21, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 10:10 AM, Boris Ostrovsky
boris.ostrov...@oracle.com
On Tue, Jul 28, 2015 at 10:10 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/28/2015 01:07 PM, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 9:30 AM, Andrew Cooper
andrew.coop...@citrix.com wrote:
I suspect that the set_ldt(NULL, 0) call hasn't reached Xen before
On 29/07/2015 01:21, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 10:10 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/28/2015 01:07 PM, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 9:30 AM, Andrew Cooper
andrew.coop...@citrix.com wrote:
I suspect that the set_ldt(NULL, 0)
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen. After several tries, I got:
[ 53.985707] [ cut here ]
[ 53.986314] kernel BUG at arch/x86/xen/enlighten.c:496!
[ 53.986677] invalid opcode:
On 07/28/2015 11:15 AM, Konrad Rzeszutek Wilk wrote:
On Tue, Jul 28, 2015 at 10:50:39AM -0400, Boris Ostrovsky wrote:
On 07/28/2015 10:35 AM, Andrew Cooper wrote:
On 28/07/15 15:05, Boris Ostrovsky wrote:
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I
On Jul 28, 2015 3:30 AM, Andrew Cooper andrew.coop...@citrix.com wrote:
On 28/07/15 04:16, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 7:20 PM, Andy Lutomirski l...@amacapital.net
wrote:
On Mon, Jul 27, 2015 at 9:18 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On
On Tue, Jul 28, 2015 at 10:50:39AM -0400, Boris Ostrovsky wrote:
On 07/28/2015 10:35 AM, Andrew Cooper wrote:
On 28/07/15 15:05, Boris Ostrovsky wrote:
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen. After several tries, I
On 28/07/15 15:50, Boris Ostrovsky wrote:
On 07/28/2015 10:35 AM, Andrew Cooper wrote:
On 28/07/15 15:05, Boris Ostrovsky wrote:
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen. After several tries, I got:
[ 53.985707]
On 28/07/15 15:05, Boris Ostrovsky wrote:
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen. After several tries, I got:
[ 53.985707] [ cut here ]
[ 53.986314] kernel BUG at
On 07/28/2015 10:35 AM, Andrew Cooper wrote:
On 28/07/15 15:05, Boris Ostrovsky wrote:
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen. After several tries, I got:
[ 53.985707] [ cut here ]
[
On 07/28/2015 11:23 AM, Andrew Cooper wrote:
On 28/07/15 15:50, Boris Ostrovsky wrote:
On 07/28/2015 10:35 AM, Andrew Cooper wrote:
On 28/07/15 15:05, Boris Ostrovsky wrote:
On 07/28/2015 06:29 AM, Andrew Cooper wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen.
On 28/07/15 04:16, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 7:20 PM, Andy Lutomirski l...@amacapital.net wrote:
On Mon, Jul 27, 2015 at 9:18 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/27/2015 11:53 AM, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 8:36 AM, Boris
On 28/07/15 16:43, Andy Lutomirski wrote:
After forward-porting my virtio patches, I got this thing to run on
Xen. After several tries, I got:
[ 53.985707] [ cut here ]
[ 53.986314] kernel BUG at arch/x86/xen/enlighten.c:496!
[ 53.986677] invalid opcode:
On Tue, Jul 28, 2015 at 9:30 AM, Andrew Cooper
andrew.coop...@citrix.com wrote:
I suspect that the set_ldt(NULL, 0) call hasn't reached Xen before
xen_free_ldt() is attempting to nab back the pages which Xen still has
mapped as an LDT.
I just instrumented it with yet more LSL instructions.
On 07/28/2015 01:07 PM, Andy Lutomirski wrote:
On Tue, Jul 28, 2015 at 9:30 AM, Andrew Cooper
andrew.coop...@citrix.com wrote:
I suspect that the set_ldt(NULL, 0) call hasn't reached Xen before
xen_free_ldt() is attempting to nab back the pages which Xen still has
mapped as an LDT.
I just
On 07/25/2015 01:36 AM, Andy Lutomirski wrote:
Here's v3. It fixes the dazed and confused issue, I hope. It's also
probably a good general attack surface reduction, and it replaces some
scary code with IMO less scary code.
Also, servers and embedded systems should probably turn off
On Mon, Jul 27, 2015 at 8:36 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/25/2015 01:36 AM, Andy Lutomirski wrote:
Here's v3. It fixes the dazed and confused issue, I hope. It's also
probably a good general attack surface reduction, and it replaces some
scary code with IMO
On 07/27/2015 11:53 AM, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 8:36 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/25/2015 01:36 AM, Andy Lutomirski wrote:
Here's v3. It fixes the dazed and confused issue, I hope. It's also
probably a good general attack surface
On Mon, Jul 27, 2015 at 9:18 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/27/2015 11:53 AM, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 8:36 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/25/2015 01:36 AM, Andy Lutomirski wrote:
Here's v3. It fixes the dazed
On Mon, Jul 27, 2015 at 8:16 PM, Andy Lutomirski l...@amacapital.net wrote:
On Mon, Jul 27, 2015 at 7:20 PM, Andy Lutomirski l...@amacapital.net wrote:
On Mon, Jul 27, 2015 at 9:18 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/27/2015 11:53 AM, Andy Lutomirski wrote:
On Mon,
On 07/27/2015 11:16 PM, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 7:20 PM, Andy Lutomirski l...@amacapital.net wrote:
On Mon, Jul 27, 2015 at 9:18 AM, Boris Ostrovsky
boris.ostrov...@oracle.com wrote:
On 07/27/2015 11:53 AM, Andy Lutomirski wrote:
On Mon, Jul 27, 2015 at 8:36 AM, Boris
On Fri, Jul 24, 2015 at 10:36:43PM -0700, Andy Lutomirski wrote:
Willy and Kees: I left the config option alone. The -tiny people will
like it, and we can always add a sysctl of some sort later.
OK, please ignore my other e-mail I missed this part. I'll see if I
can propose the sysctl
Here's v3. It fixes the dazed and confused issue, I hope. It's also
probably a good general attack surface reduction, and it replaces some
scary code with IMO less scary code.
Also, servers and embedded systems should probably turn off modify_ldt.
This makes that possible.
Xen people, can you
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