On 06:33 26.05.20, Ricardo Neri wrote:
> On Sat, May 23, 2020 at 04:17:39AM +0200, Andreas Rammhold wrote:
> > On 12:43 19.05.20, Ricardo Neri wrote:
> > > I have a patch for this already that I wrote for testing purposes:
> > >
On Sat, May 23, 2020 at 04:17:39AM +0200, Andreas Rammhold wrote:
> On 12:43 19.05.20, Ricardo Neri wrote:
> > I have a patch for this already that I wrote for testing purposes:
> > https://github.com/ricardon/tip/commit/1692889cb3f8accb523d44b682458e234b93be50
> > Perhaps it can be used as a
On 11:56 19.05.20, Brendan Shanks wrote:
> The problem is that the kernel does not emulate/spoof the SLDT instruction,
> only SGDT, SIDT, and SMSW.
> SLDT and STR weren't thought to be commonly used, so emulation/spoofing
> wasn’t added.
> In the last few months I have seen reports of one or two
On 12:43 19.05.20, Ricardo Neri wrote:
> I have a patch for this already that I wrote for testing purposes:
> https://github.com/ricardon/tip/commit/1692889cb3f8accb523d44b682458e234b93be50
> Perhaps it can be used as a starting point? Not sure what the spoofing
> value should be, though. Perhaps
> On May 20, 2020, at 5:55 PM, Ricardo Neri
> wrote:
>
> On Tue, May 19, 2020 at 05:54:53PM -0700, Andy Lutomirski wrote:
>>> On Tue, May 19, 2020 at 12:43 PM Ricardo Neri
>>> wrote:
>>>
>>> On Tue, May 19, 2020 at 11:56:40AM -0700, Brendan Shanks wrote:
> On May 19, 2020, at
On Tue, May 19, 2020 at 05:54:53PM -0700, Andy Lutomirski wrote:
> On Tue, May 19, 2020 at 12:43 PM Ricardo Neri
> wrote:
> >
> > On Tue, May 19, 2020 at 11:56:40AM -0700, Brendan Shanks wrote:
> > >
> > > > On May 19, 2020, at 7:38 AM, Andreas Rammhold
> > > > wrote:
> > > >
> > > > Hi,
> > >
On 11:56 19.05.20, Brendan Shanks wrote:
> The problem is that the kernel does not emulate/spoof the SLDT instruction,
> only SGDT, SIDT, and SMSW.
> SLDT and STR weren't thought to be commonly used, so emulation/spoofing
> wasn’t added.
> In the last few months I have seen reports of one or two
On 12:43 19.05.20, Ricardo Neri wrote:
> > > Running the same executable on the exact same kernel (and userland) but
> > > on a Intel i7-8565U doesn't crash at this point. I am guessing the
> > > emulation is supposed to do something different on AMD CPUs?
>
> I am surprised you don't see it on
On Tue, May 19, 2020 at 12:43 PM Ricardo Neri
wrote:
>
> On Tue, May 19, 2020 at 11:56:40AM -0700, Brendan Shanks wrote:
> >
> > > On May 19, 2020, at 7:38 AM, Andreas Rammhold wrote:
> > >
> > > Hi,
> > >
> > > I've been running into a weird problem with UMIP on a current Ryzen
> > > 3900x with
On 2020-05-19 07:38, Andreas Rammhold wrote:
> Hi,
>
> I've been running into a weird problem with UMIP on a current Ryzen
> 3900x with kernel 5.6.11 where a process receives a page fault after the
> kernel handled the SLDT (or SIDT) instruction (emulation).
>
> The program I am running is run
On Tue, May 19, 2020 at 11:56:40AM -0700, Brendan Shanks wrote:
>
> > On May 19, 2020, at 7:38 AM, Andreas Rammhold wrote:
> >
> > Hi,
> >
> > I've been running into a weird problem with UMIP on a current Ryzen
> > 3900x with kernel 5.6.11 where a process receives a page fault after the
> >
> On May 19, 2020, at 7:38 AM, Andreas Rammhold wrote:
>
> Hi,
>
> I've been running into a weird problem with UMIP on a current Ryzen
> 3900x with kernel 5.6.11 where a process receives a page fault after the
> kernel handled the SLDT (or SIDT) instruction (emulation).
>
> The program I am
Hi,
I've been running into a weird problem with UMIP on a current Ryzen
3900x with kernel 5.6.11 where a process receives a page fault after the
kernel handled the SLDT (or SIDT) instruction (emulation).
The program I am running is run through WINE in 32bit mode and tries to
figure out if it is
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