From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: [PATCH 07/12] acpi: Ignore acpi_rsdp kernel parameter when securelevel is set Date: Mon, 9 Sep 2013 11:49:41 -0400 Message-ID: <1378741786-18430-8-git-send-email-matthew.garrett@nebula.com> References: <1378741786-18430-1-git-send-email-matthew.garrett@nebula.com> Return-path: In-Reply-To: <1378741786-18430-1-git-send-email-matthew.garrett@nebula.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: keescook@chromium.org, gregkh@linuxfoundation.org, hpa@zytor.com, linux-efi@vger.kernel.org, jmorris@namei.org, linux-security-module@vger.kernel.org, Josh Boyer List-Id: linux-efi@vger.kernel.org From: Josh Boyer 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 securelevel is set. Signed-off-by: Josh Boyer --- 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 e5f416c..f6d8977 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include @@ -249,7 +250,7 @@ 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_securelevel <= 0)) return acpi_rsdp; #endif -- 1.8.3.1