[V31,14/25] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down
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Message ID 20190326182742.16950-15-matthewgarrett@google.com
State New, archived
Headers show
  • Add support for kernel lockdown
Related show

Commit Message

Matthew Garrett March 26, 2019, 6:27 p.m. UTC
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>
Signed-off-by: Matthew Garrett <mjg59@google.com>
cc: Dave Young <dyoung@redhat.com>
cc: linux-acpi@vger.kernel.org
 drivers/acpi/osl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index f29e427d0d1d..cd5bba7b8eb3 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -194,7 +194,8 @@  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();