On Fri, 2016-11-11 at 23:51 +0300, Stas Sergeev wrote:
> 11.11.2016 07:14, Ricardo Neri пишет:
> >> 10.11.2016 09:46, Ricardo Neri пишет:
> >>> I took a closer look at the dosemu code. It appears that it does not
> >>> purposely utilize SGDT to obtain th
On Fri, 2016-11-11 at 11:22 +0100, Borislav Petkov wrote:
> On Thu, Nov 10, 2016 at 08:08:07PM -0800, Ricardo Neri wrote:
> > UMIP is enabled by setting a bit in CR4. If that bit is not supposed
> > to be set, that could cause a #GP fault.
>
> Yeah, you do check CPUID first,
On Thu, 2016-11-10 at 11:52 +0300, Stas Sergeev wrote:
> Hi!
>
> I don't know the context of that discussion, so I'll only
> comment on the dosemu part.
I'm sorry! I will cc you and the linux-msdos list in my v2.
>
> 10.11.2016 09:46, Ricardo Neri пишет:
>
On Thu, 2016-11-10 at 09:58 +0100, Borislav Petkov wrote:
> On Wed, Nov 09, 2016 at 07:24:43PM -0800, Ricardo Neri wrote:
> > I intended this feature to be configurable at build time in case someone
> > wants to build a kernel without it; similar to other features such as
> &
On Wed, 2016-11-09 at 03:05 -0800, Andy Lutomirski wrote:
> On Tue, Nov 8, 2016 at 8:31 PM, Ricardo Neri
> wrote:
> > On Tue, 2016-11-08 at 07:34 -0800, Andy Lutomirski wrote:
> >> > Would it not be better to emulate these instructions for them? What
> >> way
On Wed, 2016-11-09 at 03:02 -0800, Andy Lutomirski wrote:
> On Tue, Nov 8, 2016 at 8:25 PM, Ricardo Neri
> wrote:
> > On Tue, 2016-11-08 at 07:32 -0800, Andy Lutomirski wrote:
> >> > diff --git a/arch/x86/include/asm/disabled-features.h
> >> b/arch/x86/include/asm
On Tue, 2016-11-08 at 07:34 -0800, Andy Lutomirski wrote:
> > Would it not be better to emulate these instructions for them? What
> way
> > we can verify they're not malicious.
>
> Forget malice -- if they are really needed for some silly vm86-using
> program, let's trap them and emulate them so t
On Tue, 2016-11-08 at 18:00 +0100, Peter Zijlstra wrote:
> > > + }
> > > +#endif
> > > +
> >
> > NAK. If this code is going to exist, it needs to be deeply buried
> in
> > some unlikely if statement that already exists. There's no good
> > reason to penalize all context switches to support
On Tue, 2016-11-08 at 17:52 +0100, Thomas Gleixner wrote:
> On Tue, 8 Nov 2016, Andy Lutomirski wrote:
> > On Tue, Nov 8, 2016 at 5:16 AM, Peter Zijlstra wrote:
> > > On Mon, Nov 07, 2016 at 10:12:09PM -0800, Ricardo Neri wrote:
> > >> There is a caveat, however. C
On Tue, 2016-11-08 at 07:32 -0800, Andy Lutomirski wrote:
> > diff --git a/arch/x86/include/asm/disabled-features.h
> b/arch/x86/include/asm/disabled-features.h
> > index 85599ad..4707445 100644
> > --- a/arch/x86/include/asm/disabled-features.h
> > +++ b/arch/x86/include/asm/disabled-features.h
>
Corbet
Cc: Michael S. Tsirkin
Cc: Paul Gortmaker
Cc: Peter Zijlstra
Cc: Ravi V. Shankar
Cc: Shuah Khan
Cc: Vlastimil Babka
Signed-off-by: Ricardo Neri
---
Documentation/kernel-parameters.txt | 5
arch/x86/Kconfig| 10
arch/x86/kernel/cpu/common.c| 50
: Paul Gortmaker
Cc: Peter Zijlstra
Cc: Ravi V. Shankar
Cc: Shuah Khan
Cc: Vlastimil Babka
Signed-off-by: Ricardo Neri
---
tools/testing/selftests/x86/entry_from_vm86.c | 10 +-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/x86/entry_from_vm86.c
b
lf
Cc: Dave Hansen
Cc: Fenghua Yu
Cc: Huang Rui
Cc: Jiri Slaby
Cc: Jonathan Corbet
Cc: Michael S. Tsirkin
Cc: Paul Gortmaker
Cc: Peter Zijlstra
Cc: Ravi V. Shankar
Cc: Shuah Khan
Cc: Vlastimil Babka
Signed-off-by: Ricardo Neri
---
arch/x86/include/asm/cpufeatures.h | 1 +
ar
l S. Tsirkin
Cc: Paul Gortmaker
Cc: Peter Zijlstra
Cc: Ravi V. Shankar
Cc: Shuah Khan
Cc: Vlastimil Babka
Signed-off-by: Ricardo Neri
---
arch/x86/include/asm/vm86.h | 3 +++
arch/x86/kernel/process.c | 10 ++
arch/x86/kernel/vm86_32.c | 20
3 files changed,
Shuah Khan
[1]. http://www.dosemu.org/
[2]. https://wiki.winehq.org/Main_Page
Ricardo Neri (4):
x86/cpufeature: Add User-Mode Instruction Prevention definitions
x86: Prepare vm86 tasks to handle User-Mode Instruction Prevention
x86: Enable User-Mode Instruction Prevention
selftests/x86: Ad
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