3 files changed, 11 insertions, 2 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 131936e7ff17..bbd8360bfb23 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -392,6 +392,13 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
                         *new_table = initrd_table;
         }
 #endif
+        if (*new_table != NULL) {
+                printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
+                           "this is unsafe: tainting kernel\n",
+                       existing_table->signature,
+                       existing_table->oem_table_id);
+                add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
+        }
         return AE_OK;
 }
 
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 18222f267bc4..9e01f376840a 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -243,6 +243,7 @@ extern enum system_states {
 #define TAINT_BAD_PAGE                  (1<<5)
 #define TAINT_USER                      (1<<6)
 #define TAINT_DIE                       (1<<7)
+#define TAINT_OVERRIDDEN_ACPI_TABLE     (1<<8)
 
 extern void dump_stack(void) __cold;
 
diff --git a/kernel/panic.c b/kernel/panic.c
index d9e90cfe3298..24af9f8bac99 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -161,7 +161,7 @@ const char *print_tainted(void)
 {
         static char buf[20];
         if (tainted) {
-                snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c",
+                snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c",
                         tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
                         tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
                         tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
@@ -169,7 +169,8 @@ const char *print_tainted(void)
                         tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
                         tainted & TAINT_BAD_PAGE ? 'B' : ' ',
                         tainted & TAINT_USER ? 'U' : ' ',
-                        tainted & TAINT_DIE ? 'D' : ' ');
+                        tainted & TAINT_DIE ? 'D' : ' ',
+                        tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ');
         }
         else
                 snprintf(buf, sizeof(buf), "Not tainted");