[PATCH 13/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

David Howells dhowells at redhat.com
Wed Apr 11 16:26:04 UTC 2018

From: Josh Boyer <jwboyer at 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 at redhat.com>
Signed-off-by: David Howells <dhowells at redhat.com>
Reviewed-by: "Lee, Chun-Yi" <jlee at suse.com>
cc: Dave Young <dyoung at redhat.com>
cc: linux-acpi at 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;
-	if (acpi_rsdp)
+	if (acpi_rsdp && !kernel_is_locked_down("ACPI RSDP specification"))
 		return acpi_rsdp;
 	pa = acpi_arch_get_root_pointer();

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