On Tue, Aug 06, 2019 at 09:59:42AM -0400, Steven Rostedt wrote:
> As Peter stated later in this thread, we only have the IRQ stack frame saved
> here, because we just took an NMI, and this is the logic to determine if it
> was a nested NMI or not (where we have to be *very* careful about touching
On Mon, Aug 05, 2019 at 07:28:54PM +0200, Borislav Petkov wrote:
> > 1:
> > @@ -1571,7 +1572,8 @@ nested_nmi:
> > pushq %rdx
> > pushfq
> > pushq $__KERNEL_CS
> > - pushq $repeat_nmi
> > + leaqrepeat_nmi(%rip), %rdx
> > + pushq %rdx
> >
> > /* Put stack back */
+ rostedt.
Steve, pls have a look at the patch at the beginning of this thread as
it touches the reentrant NMI magic. :)
Thx.
On Tue, Aug 06, 2019 at 10:30:32AM +0200, Peter Zijlstra wrote:
> On Tue, Aug 06, 2019 at 07:08:51AM +0200, Borislav Petkov wrote:
> > On Mon, Aug 05, 2019 at 10:50:30AM
On Tue, Aug 06, 2019 at 07:08:51AM +0200, Borislav Petkov wrote:
> On Mon, Aug 05, 2019 at 10:50:30AM -0700, Thomas Garnier wrote:
> > I saw that %rdx was used for temporary usage and restored before the
> > end so I assumed that it was not an option.
>
> PUSH_AND_CLEAR_REGS saves all regs
On Mon, Aug 05, 2019 at 10:50:30AM -0700, Thomas Garnier wrote:
> I saw that %rdx was used for temporary usage and restored before the
> end so I assumed that it was not an option.
PUSH_AND_CLEAR_REGS saves all regs earlier so I think you should be
able to use others. Like
On Mon, Aug 5, 2019 at 10:28 AM Borislav Petkov wrote:
>
> On Tue, Jul 30, 2019 at 12:12:48PM -0700, Thomas Garnier wrote:
> > Change the assembly code to use only relative references of symbols for the
> > kernel to be PIE compatible.
> >
> > Position Independent Executable (PIE) support will
On Tue, Jul 30, 2019 at 12:12:48PM -0700, Thomas Garnier wrote:
> Change the assembly code to use only relative references of symbols for the
> kernel to be PIE compatible.
>
> Position Independent Executable (PIE) support will allow to extend the
> KASLR randomization range below
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extend the
KASLR randomization range below 0x8000.
Signed-off-by: Thomas Garnier
Reviewed-by: Kees Cook
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