On 07/21/2018 07:18 PM, M. Vefa Bicakci wrote:
> On 07/21/2018 05:19 PM, Boris Ostrovsky wrote:
>> On 07/21/2018 03:49 PM, M. Vefa Bicakci wrote:
>>> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
>>> index c7449f377a77..96e8ff34129e 100644
>>> --- a/arch/x86/entry/entry_64.S
On 22/07/18 18:56, Andy Lutomirski wrote:
> On Sat, Jul 21, 2018 at 6:20 PM, M. Vefa Bicakci wrote:
>> On 07/21/2018 07:37 PM, M. Vefa Bicakci wrote:
>>> On 07/21/2018 07:30 PM, Andy Lutomirski wrote:
On Sat, Jul 21, 2018 at 4:19 PM, M. Vefa Bicakci
wrote:
> On 07/21/2018 05:45 PM,
On Sat, Jul 21, 2018 at 6:20 PM, M. Vefa Bicakci wrote:
> On 07/21/2018 07:37 PM, M. Vefa Bicakci wrote:
>>
>> On 07/21/2018 07:30 PM, Andy Lutomirski wrote:
>>>
>>> On Sat, Jul 21, 2018 at 4:19 PM, M. Vefa Bicakci
>>> wrote:
On 07/21/2018 05:45 PM, Andy Lutomirski wrote:
>
>
On 07/21/2018 07:37 PM, M. Vefa Bicakci wrote:
On 07/21/2018 07:30 PM, Andy Lutomirski wrote:
On Sat, Jul 21, 2018 at 4:19 PM, M. Vefa Bicakci wrote:
On 07/21/2018 05:45 PM, Andy Lutomirski wrote:
On Sat, Jul 21, 2018 at 12:49 PM, M. Vefa Bicakci
wrote:
Commit 3ac6d8c787b8
On 07/21/2018 07:30 PM, Andy Lutomirski wrote:
On Sat, Jul 21, 2018 at 4:19 PM, M. Vefa Bicakci wrote:
On 07/21/2018 05:45 PM, Andy Lutomirski wrote:
On Sat, Jul 21, 2018 at 12:49 PM, M. Vefa Bicakci
wrote:
Commit 3ac6d8c787b8 ("x86/entry/64: Clear registers for
exceptions/interrupts, to
On Sat, Jul 21, 2018 at 4:19 PM, M. Vefa Bicakci wrote:
> On 07/21/2018 05:45 PM, Andy Lutomirski wrote:
>>
>> On Sat, Jul 21, 2018 at 12:49 PM, M. Vefa Bicakci
>> wrote:
>>>
>>> Commit 3ac6d8c787b8 ("x86/entry/64: Clear registers for
>>> exceptions/interrupts, to reduce speculation attack
On 07/21/2018 05:19 PM, Boris Ostrovsky wrote:
On 07/21/2018 03:49 PM, M. Vefa Bicakci wrote:
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index c7449f377a77..96e8ff34129e 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1129,7 +1129,7 @@
On 07/21/2018 05:45 PM, Andy Lutomirski wrote:
On Sat, Jul 21, 2018 at 12:49 PM, M. Vefa Bicakci wrote:
Commit 3ac6d8c787b8 ("x86/entry/64: Clear registers for
exceptions/interrupts, to reduce speculation attack surface") unintendedly
broke Xen PV virtual machines by clearing the %rbx register
On Sat, Jul 21, 2018 at 12:49 PM, M. Vefa Bicakci wrote:
> Commit 3ac6d8c787b8 ("x86/entry/64: Clear registers for
> exceptions/interrupts, to reduce speculation attack surface") unintendedly
> broke Xen PV virtual machines by clearing the %rbx register at the end of
> xen_failsafe_callback
On 07/21/2018 03:49 PM, M. Vefa Bicakci wrote:
> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> index c7449f377a77..96e8ff34129e 100644
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -1129,7 +1129,7 @@ ENTRY(xen_failsafe_callback)
> addq
Commit 3ac6d8c787b8 ("x86/entry/64: Clear registers for
exceptions/interrupts, to reduce speculation attack surface") unintendedly
broke Xen PV virtual machines by clearing the %rbx register at the end of
xen_failsafe_callback before the latter jumps to error_exit.
error_exit expects the %rbx
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