iommu/vt-d: Parse ANDD records

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index b19f9f4c3584..eb95020c2314 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -373,6 +373,26 @@ static void dmar_free_drhd(struct dmar_drhd_unit *dmaru)
         kfree(dmaru);
 }
 
+static int __init dmar_parse_one_andd(struct acpi_dmar_header *header)
+{
+        struct acpi_dmar_andd *andd = (void *)header;
+
+        /* Check for NUL termination within the designated length */
+        if (strnlen(andd->object_name, header->length - 8) == header->length - 8) {
+                WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND,
+                           "Your BIOS is broken; ANDD object name is not NUL-terminated\n"
+                           "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
+                           dmi_get_system_info(DMI_BIOS_VENDOR),
+                           dmi_get_system_info(DMI_BIOS_VERSION),
+                           dmi_get_system_info(DMI_PRODUCT_VERSION));
+                return -EINVAL;
+        }
+        pr_info("ANDD device: %x name: %s\n", andd->device_number,
+                andd->object_name);
+
+        return 0;
+}
+
 #ifdef CONFIG_ACPI_NUMA
 static int __init
 dmar_parse_one_rhsa(struct acpi_dmar_header *header)
@@ -436,6 +456,10 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
                        (unsigned long long)rhsa->base_address,
                        rhsa->proximity_domain);
                 break;
+        case ACPI_DMAR_TYPE_ANDD:
+                /* We don't print this here because we need to sanity-check
+                   it first. So print it in dmar_parse_one_andd() instead. */
+                break;
         }
 }
 
@@ -521,6 +545,9 @@ parse_dmar_table(void)
                         ret = dmar_parse_one_rhsa(entry_header);
 #endif
                         break;
+                case ACPI_DMAR_TYPE_ANDD:
+                        ret = dmar_parse_one_andd(entry_header);
+                        break;
                 default:
                         pr_warn("Unknown DMAR structure type %d\n",
                                 entry_header->type);