On Mon, 23 Sep, at 11:45:28AM, Bart Kuivenhoven wrote: > The problem in efi_main was that the idt was cleared before the > interrupts were disabled. > > The UEFI spec states that interrupts aren't used so this shouldn't be > too much of a problem. Peripherals however don't necessarily know about > this and thus might cause interrupts to happen anyway. Even if > ExitBootServices() has been called. > > This means there is a risk of an interrupt being triggered while the IDT > register is nullified and the interrupt bit hasn't been cleared, > allowing for a triple fault. > > This patch disables the interrupt flag, while leaving the existing IDT > in place. The CPU won't care about the IDT at all as long as the > interrupt bit is off, so it's safe to leave it in place as nothing will > ever happen to it. > > Signed-off-by: Bart Kuivenhoven <b...@redhat.com> > --- > arch/x86/boot/compressed/eboot.c | 15 +-------------- > 1 file changed, 1 insertion(+), 14 deletions(-)
Applied, thanks Bart! -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
