From: Josh Boyer <jwbo...@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 <jwbo...@redhat.com>
Signed-off-by: David Howells <dhowe...@redhat.com>
Signed-off-by: Matthew Garrett <mj...@google.com>
cc: Dave Young <dyo...@redhat.com>
cc: linux-a...@vger.kernel.org
---
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 f29e427d0d1d..60cda8a0f36b 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -40,6 +40,7 @@
#include <linux/list.h>
#include <linux/jiffies.h>
#include <linux/semaphore.h>
+#include <linux/security.h>
#include <asm/io.h>
#include <linux/uaccess.h>
@@ -194,7 +195,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
acpi_physical_address pa;
#ifdef CONFIG_KEXEC
- if (acpi_rsdp)
+ if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES))
return acpi_rsdp;
#endif
pa = acpi_arch_get_root_pointer();
--
2.22.0.410.gd8fdbe21b5-goog
