On 09/12/2014 10:52 AM, Thomas Gleixner wrote:
>
> Well, I did not see the trainwreck which tried to use the generic
> decoder, but as I explained in the other mail, there is no reason not
> to use it and I can't see any complexity in retrieving the data beyond
> calling insn_get_length(insn);
>
On Thu, 11 Sep 2014, H. Peter Anvin wrote:
> On 09/11/2014 03:32 PM, Dave Hansen wrote:
> > On 09/11/2014 03:18 PM, Thomas Gleixner wrote:
> >> On Thu, 11 Sep 2014, Qiaowei Ren wrote:
> >>> This patch sets bound violation fields of siginfo struct in #BR
> >>> exception handler by decoding the user
On Fri, 12 Sep 2014, H. Peter Anvin wrote:
> The correct limit is 15 bytes, not anything else, so this is a bug in
> the existing decoder. A sequence of bytes longer than 15 bytes will
Fine. Lets fix it there.
> #UD, regardless of being "otherwise valid".
> Keep in mind the instruction may not
On 09/12/2014 06:10 AM, Thomas Gleixner wrote:
>>
>> I'm not wedded to that concept, by the way, but using the generic parser had
>> a
>> whole bunch of its own problems, including the fact that you're getting bytes
>> from user space.
>
> Errm. The instruction decoder does not even know about us
On Thu, 11 Sep 2014, H. Peter Anvin wrote:
> On 09/11/2014 04:37 PM, Thomas Gleixner wrote:
> > >
> > > Specifically because marshaling the data in and out of the generic
> > > decoder was more complex than a special-purpose decoder.
> >
> > I did not look at that detail and I trust your judgeme
On 09/11/2014 04:37 PM, Thomas Gleixner wrote:
Specifically because marshaling the data in and out of the generic
decoder was more complex than a special-purpose decoder.
I did not look at that detail and I trust your judgement here, but
that is in no way explained in the changelog.
This whol
On Thu, 11 Sep 2014, H. Peter Anvin wrote:
> On 09/11/2014 03:32 PM, Dave Hansen wrote:
> > On 09/11/2014 03:18 PM, Thomas Gleixner wrote:
> >> On Thu, 11 Sep 2014, Qiaowei Ren wrote:
> >>> This patch sets bound violation fields of siginfo struct in #BR
> >>> exception handler by decoding the user
On 09/11/2014 03:32 PM, Dave Hansen wrote:
> On 09/11/2014 03:18 PM, Thomas Gleixner wrote:
>> On Thu, 11 Sep 2014, Qiaowei Ren wrote:
>>> This patch sets bound violation fields of siginfo struct in #BR
>>> exception handler by decoding the user instruction and constructing
>>> the faulting pointer
On 09/11/2014 03:18 PM, Thomas Gleixner wrote:
> On Thu, 11 Sep 2014, Qiaowei Ren wrote:
>> This patch sets bound violation fields of siginfo struct in #BR
>> exception handler by decoding the user instruction and constructing
>> the faulting pointer.
>>
>> This patch does't use the generic decoder
On Thu, 11 Sep 2014, Qiaowei Ren wrote:
> This patch sets bound violation fields of siginfo struct in #BR
> exception handler by decoding the user instruction and constructing
> the faulting pointer.
>
> This patch does't use the generic decoder, and implements a limited
> special-purpose decoder
This patch sets bound violation fields of siginfo struct in #BR
exception handler by decoding the user instruction and constructing
the faulting pointer.
This patch does't use the generic decoder, and implements a limited
special-purpose decoder to decode MPX instructions, simply because the
gener
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