On Tue, Mar 19, 2013 at 04:47:27PM +0800, Dave Young wrote:
> On 03/19/2013 05:32 AM, Matthew Garrett wrote:
> > From: Josh Boyer <jwboyer@xxxxxxxxxx>
> >
> > This option allows userspace to pass the RSDP address to the kernel. This
> > could potentially be used to circumvent the secure boot trust model.
> > We ignore the setting if we don't have the CAP_COMPROMISE_KERNEL capability.
> >
> > Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx>
> > ---
> > drivers/acpi/osl.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> > index 586e7e9..0ef63f1 100644
> > --- a/drivers/acpi/osl.c
> > +++ b/drivers/acpi/osl.c
> > @@ -245,7 +245,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
> > acpi_physical_address __init acpi_os_get_root_pointer(void)
> > {
> > #ifdef CONFIG_KEXEC
> > - if (acpi_rsdp)
> > + if (acpi_rsdp && capable(CAP_COMPROMISE_KERNEL))
> > return acpi_rsdp;
> > #endif
> >
> >
>
> This does not work because capable is not usable at this early point.
Right.
> Josh, could you update your fix here?
I have. Twice. Matthew sent out a stale patch.
josh
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