On Thu, Feb 18, 2021 at 04:28:36PM -0800, Andy Lutomirski wrote:
> On Thu, Feb 18, 2021 at 11:21 AM Joerg Roedel wrote:
> Can you give me an example, even artificial, in which the linked-list
> logic is useful?
So here we go, its of course artificial, but still:
1. #VC happens, not impor
On Thu, Feb 18, 2021 at 11:21 AM Joerg Roedel wrote:
>
> On Thu, Feb 18, 2021 at 09:49:06AM -0800, Andy Lutomirski wrote:
> > I don't understand what this means. The whole entry mechanism on x86
> > is structured so that we call a C function *and return from that C
> > function without longjmp-li
On Thu, Feb 18, 2021 at 09:49:06AM -0800, Andy Lutomirski wrote:
> I don't understand what this means. The whole entry mechanism on x86
> is structured so that we call a C function *and return from that C
> function without longjmp-like magic* with the sole exception of
> unwind_stack_do_exit().
On Thu, Feb 18, 2021 at 3:25 AM Joerg Roedel wrote:
>
> Hi Andy,
>
> On Wed, Feb 17, 2021 at 10:09:46AM -0800, Andy Lutomirski wrote:
> > Can you get rid of the linked list hack while you're at it? This code
> > is unnecessarily convoluted right now, and it seems to be just asking
> > for weird b
Hi Andy,
On Wed, Feb 17, 2021 at 10:09:46AM -0800, Andy Lutomirski wrote:
> Can you get rid of the linked list hack while you're at it? This code
> is unnecessarily convoluted right now, and it seems to be just asking
> for weird bugs. Just stash the old value in a local variable, please.
Yeah,
On Wed, Feb 17, 2021 at 4:02 AM Joerg Roedel wrote:
>
> From: Joerg Roedel
>
> The code in the NMI handler to adjust the #VC handler IST stack is
> needed in case an NMI hits when the #VC handler is still using its IST
> stack.
> But the check for this condition also needs to look if the regs->sp
On Wed, Feb 17, 2021 at 01:01:42PM +0100, Joerg Roedel wrote:
> From: Joerg Roedel
>
> The code in the NMI handler to adjust the #VC handler IST stack is
> needed in case an NMI hits when the #VC handler is still using its IST
> stack.
> But the check for this condition also needs to look if the
From: Joerg Roedel
The code in the NMI handler to adjust the #VC handler IST stack is
needed in case an NMI hits when the #VC handler is still using its IST
stack.
But the check for this condition also needs to look if the regs->sp
value is trusted, meaning it was not set by user-space. Extend th
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