linux-kernel - [PATCH 16/30] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

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Message-Id: <151024875727.28329.10602033342875428842.stgit@warthog.procyon.org.uk>
Date:   Thu,  9 Nov 2017 17:32:37 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-security-module@...r.kernel.org
Cc:     gnomes@...rguk.ukuu.org.uk, linux-efi@...r.kernel.org,
        dhowells@...hat.com, linux-kernel@...r.kernel.org,
        jforbes@...hat.com
Subject: [PATCH 16/30] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

From: Josh Boyer <jwboyer@...hat.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@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: "Lee, Chun-Yi" <jlee@...e.com>
cc: Dave Young <dyoung@...hat.com>
cc: linux-acpi@...r.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