ACPICA: Add detection of corrupted/replaced DSDT

This change adds support to detect a DSDT that has been corrupted
and/or replaced from outside the OS (by firmware). This is
typically catastrophic for the system, but has been seen on
some machines.

https://bugzilla.kernel.org/show_bug.cgi?id=14679

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/acpica/acglobal.h

@@ -165,6 +165,11 @@ ACPI_EXTERN struct acpi_generic_address acpi_gbl_xpm1a_enable;
 ACPI_EXTERN struct acpi_generic_address acpi_gbl_xpm1b_status;
 ACPI_EXTERN struct acpi_generic_address acpi_gbl_xpm1b_enable;
 
+/* DSDT information. Used to check for DSDT corruption */
+
+ACPI_EXTERN struct acpi_table_desc *acpi_gbl_DSDT;
+ACPI_EXTERN struct acpi_table_header acpi_gbl_original_dsdt_header;
+
 /*
  * Handle both ACPI 1.0 and ACPI 2.0 Integer widths. The integer width is
  * determined by the revision of the DSDT: If the DSDT revision is less than

drivers/acpi/acpica/actables.h

@@ -107,6 +107,8 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length);
 acpi_status
 acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length);
 
+void acpi_tb_check_dsdt_header(void);
+
 void
 acpi_tb_install_table(acpi_physical_address address,
 		      char *signature, u32 table_index);

drivers/acpi/acpica/psxface.c

@@ -220,6 +220,10 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
 
 	ACPI_FUNCTION_TRACE(ps_execute_method);
 
+	/* Quick validation of DSDT header */
+
+	acpi_tb_check_dsdt_header();
+
 	/* Validate the Info and method Node */
 
 	if (!info || !info->resolved_node) {

drivers/acpi/acpica/tbutils.c

@@ -347,6 +347,44 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length)
 	return sum;
 }
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_check_dsdt_header
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
+ *              if the DSDT has been replaced from outside the OS and/or if
+ *              the DSDT header has been corrupted.
+ *
+ ******************************************************************************/
+
+void acpi_tb_check_dsdt_header(void)
+{
+
+	/* Compare original length and checksum to current values */
+
+	if (acpi_gbl_original_dsdt_header.length !=
+	    acpi_gbl_DSDT->pointer->length
+	    || acpi_gbl_original_dsdt_header.checksum !=
+	    acpi_gbl_DSDT->pointer->checksum) {
+		ACPI_ERROR((AE_INFO,
+			    "The DSDT has been corrupted or replaced - old, new headers below"));
+		acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
+		acpi_tb_print_table_header(acpi_gbl_DSDT->address,
+					   acpi_gbl_DSDT->pointer);
+
+		/* Disable further error messages */
+
+		acpi_gbl_original_dsdt_header.length =
+		    acpi_gbl_DSDT->pointer->length;
+		acpi_gbl_original_dsdt_header.checksum =
+		    acpi_gbl_DSDT->pointer->checksum;
+	}
+}
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_tb_install_table

drivers/acpi/acpica/tbxface.c

@@ -518,33 +518,25 @@ static acpi_status acpi_tb_load_namespace(void)
 
 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 
+	acpi_gbl_DSDT = &acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT];
+
 	/*
-	 * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
-	 * are optional.
+	 * Load the namespace. The DSDT is required, but any SSDT and
+	 * PSDT tables are optional. Verify the DSDT.
 	 */
 	if (!acpi_gbl_root_table_list.count ||
-	    !ACPI_COMPARE_NAME(&
-			       (acpi_gbl_root_table_list.
-				tables[ACPI_TABLE_INDEX_DSDT].signature),
-			       ACPI_SIG_DSDT)
-	    ||
-	    ACPI_FAILURE(acpi_tb_verify_table
-			 (&acpi_gbl_root_table_list.
-			  tables[ACPI_TABLE_INDEX_DSDT]))) {
+	    !ACPI_COMPARE_NAME(&acpi_gbl_DSDT->signature, ACPI_SIG_DSDT) ||
+	    ACPI_FAILURE(acpi_tb_verify_table(acpi_gbl_DSDT))) {
 		status = AE_NO_ACPI_TABLES;
 		goto unlock_and_exit;
 	}
 
-	/* A valid DSDT is required */
-
-	status =
-	    acpi_tb_verify_table(&acpi_gbl_root_table_list.
-				 tables[ACPI_TABLE_INDEX_DSDT]);
-	if (ACPI_FAILURE(status)) {
-
-		status = AE_NO_ACPI_TABLES;
-		goto unlock_and_exit;
-	}
+	/*
+	 * Save the original DSDT header for detection of table corruption
+	 * and/or replacement of the DSDT from outside the OS.
+	 */
+	ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT->pointer,
+		    sizeof(struct acpi_table_header));
 
 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);