Messages in this thread Patch in this message | | | From | Matthew Garrett <> | Date | Fri, 13 Mar 2015 11:38:23 -1000 | Subject | [PATCH 07/12] acpi: Ignore acpi_rsdp kernel parameter when trusted_kernel is true. |
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From: Josh Boyer <jwboyer@redhat.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@redhat.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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