On Sat, May 9, 2020 at 2:23 AM Lai Jiangshan <jiangshanlai+l...@gmail.com> wrote: > > On Tue, May 5, 2020 at 10:15 PM Thomas Gleixner <t...@linutronix.de> wrote: > > > > From: Andy Lutomirski <l...@kernel.org> > > > > A data breakpoint near the top of an IST stack will cause unresoverable > > recursion. A data breakpoint on the GDT, IDT, or TSS is terrifying. > > Prevent either of these from happening. > > > > What happen when a data breakpoint on the direct GDT (load_direct_gdt()) > and the debug IDT (load_debug_idt()) which are not considered in this patch? >
I have no idea, and learning the answer may involve talking to the respective CPU vendors' microcode engineers. We should probably block those, too.
