| Subject | [PATCH 15/27] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down | From | David Howells <> | Date | Thu, 19 Oct 2017 15:52:27 +0100 |
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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> 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 db78d353bab1..36c6527c1b0a 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 = 0; #ifdef CONFIG_KEXEC - if (acpi_rsdp) + if (acpi_rsdp && !kernel_is_locked_down("ACPI RSDP specification")) return acpi_rsdp; #endif
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