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    Subject[PATCH 13/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down
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    From: Josh Boyer <jwboyer@redhat.com>

    This option allows userspace to pass the RSDP address to the kernel, which
    makes it possible for a user to modify the workings of hardware . Reject
    the option when the kernel is locked down.

    Signed-off-by: Josh Boyer <jwboyer@redhat.com>
    Signed-off-by: David Howells <dhowells@redhat.com>
    Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com>
    cc: Dave Young <dyoung@redhat.com>
    cc: linux-acpi@vger.kernel.org
    ---

    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 7ca41bf023c9..34e4ce7939f4 100644
    --- a/drivers/acpi/osl.c
    +++ b/drivers/acpi/osl.c
    @@ -192,7 +192,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
    acpi_physical_address pa;

    #ifdef CONFIG_KEXEC
    - if (acpi_rsdp)
    + if (acpi_rsdp && !kernel_is_locked_down("ACPI RSDP specification"))
    return acpi_rsdp;
    #endif
    pa = acpi_arch_get_root_pointer();
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