[PATCH V2 07/10] acpi: Ignore acpi_rsdp kernel parameter when module loading is restricted

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From: Josh Boyer <jwboyer@xxxxxxxxxx>

This option allows userspace to pass the RSDP address to the kernel, which
makes it possible for a user to circumvent any restrictions imposed on
loading modules. Disable it in that case.

Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx>
---
 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 6ab2c35..e4c4410 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -45,6 +45,7 @@
 #include <linux/list.h>
 #include <linux/jiffies.h>
 #include <linux/semaphore.h>
+#include <linux/module.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -245,7 +246,7 @@ 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 && !secure_modules())
 		return acpi_rsdp;
 #endif
 
-- 
1.8.3.1

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