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    SubjectRe: [PATCH 10/11] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment
    From
    On Tue, Sep 4, 2012 at 9:55 AM, Matthew Garrett <mjg@redhat.com> wrote:
    > From: Josh Boyer <jwboyer@redhat.com>
    >
    > 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_SECURE_FIRMWARE capability.

    Does this mean, acpi_rsdp is disabled on all current platforms that
    don't support CAP_SECURE_FIRMWARE?

    -- Shuah
    >
    > Signed-off-by: Josh Boyer <jwboyer@redhat.com>
    > ---
    > 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 9eaf708..50c94e4 100644
    > --- a/drivers/acpi/osl.c
    > +++ b/drivers/acpi/osl.c
    > @@ -246,7 +246,7 @@ 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_SECURE_FIRMWARE))
    > return acpi_rsdp;
    > #endif
    >
    > --
    > 1.7.11.4
    >
    > --
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