linux-kernel - [PATCH 07/12] acpi: Ignore acpi_rsdp kernel parameter when trusted

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Date:	Fri, 13 Mar 2015 11:38:23 -1000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	linux-security-module@...r.kernel.org
Cc:	james.l.morris@...cle.com, serge@...lyn.com,
	linux-kernel@...r.kernel.org, keescook@...omium.org, hpa@...or.com,
	gnomes@...rguk.ukuu.org.uk, Josh Boyer <jwboyer@...hat.com>
Subject: [PATCH 07/12] acpi: Ignore acpi_rsdp kernel parameter when trusted_kernel is true.

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 execute arbitrary code in the kernel.
Disable this when trusted_kernel is true.

Signed-off-by: Josh Boyer <jwboyer@...hat.com>
---
 drivers/acpi/osl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index f9eeae8..6984fc0 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -44,6 +44,7 @@
 #include <linux/list.h>
 #include <linux/jiffies.h>
 #include <linux/semaphore.h>
+#include <linux/security.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -255,7 +256,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
 acpi_physical_address __init acpi_os_get_root_pointer(void)
 {
 #ifdef CONFIG_KEXEC
-	if (acpi_rsdp)
+	if (acpi_rsdp && !get_trusted_kernel())
 		return acpi_rsdp;
 #endif
 
-- 
2.1.0

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