On Sat, May 9, 2020 at 2:23 AM Lai Jiangshan <[email protected]> wrote: > > On Tue, May 5, 2020 at 10:15 PM Thomas Gleixner <[email protected]> wrote: > > > > From: Andy Lutomirski <[email protected]> > > > > 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.
