Merge branch 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI update from Ingo Molnar:
 "This tree includes various fixes, cleanups, a new efi=debug boot
  option and EFI boot stub memory allocation optimizations"

* 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/libstub: Retrieve FDT size when loaded from UEFI config table
  efi: Clean up the efi_call_phys_[prolog|epilog]() save/restore interaction
  efi: Disable interrupts around EFI calls, not in the epilog/prolog calls
  x86/efi: Add a "debug" option to the efi= cmdline
  firmware: dmi_scan: Use direct access to static vars
  firmware: dmi_scan: Use full dmi version for SMBIOS3

drivers/firmware/dmi_scan.c

@@ -17,7 +17,9 @@
  */
 static const char dmi_empty_string[] = "        ";
 
-static u16 __initdata dmi_ver;
+static u32 dmi_ver __initdata;
+static u32 dmi_len;
+static u16 dmi_num;
 /*
  * Catch too early calls to dmi_check_system():
  */
@@ -78,7 +80,7 @@ static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
  *	We have to be cautious here. We have seen BIOSes with DMI pointers
  *	pointing to completely the wrong place for example
  */
-static void dmi_table(u8 *buf, u32 len, int num,
+static void dmi_table(u8 *buf,
 		      void (*decode)(const struct dmi_header *, void *),
 		      void *private_data)
 {
@@ -91,8 +93,8 @@ static void dmi_table(u8 *buf, u32 len, int num,
 	 * off the end of the table (should never happen but sometimes does
 	 * on bogus implementations.)
 	 */
-	while ((!num || i < num) &&
-	       (data - buf + sizeof(struct dmi_header)) <= len) {
+	while ((!dmi_num || i < dmi_num) &&
+	       (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
 		const struct dmi_header *dm = (const struct dmi_header *)data;
 
 		/*
@@ -101,9 +103,9 @@ static void dmi_table(u8 *buf, u32 len, int num,
 		 *  table in dmi_decode or dmi_string
 		 */
 		data += dm->length;
-		while ((data - buf < len - 1) && (data[0] || data[1]))
+		while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
 			data++;
-		if (data - buf < len - 1)
+		if (data - buf < dmi_len - 1)
 			decode(dm, private_data);
 
 		/*
@@ -118,8 +120,6 @@ static void dmi_table(u8 *buf, u32 len, int num,
 }
 
 static phys_addr_t dmi_base;
-static u32 dmi_len;
-static u16 dmi_num;
 
 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
 		void *))
@@ -130,7 +130,7 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
 	if (buf == NULL)
 		return -1;
 
-	dmi_table(buf, dmi_len, dmi_num, decode, NULL);
+	dmi_table(buf, decode, NULL);
 
 	add_device_randomness(buf, dmi_len);
 
@@ -201,7 +201,7 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
 	 * the UUID are supposed to be little-endian encoded.  The specification
 	 * says that this is the defacto standard.
 	 */
-	if (dmi_ver >= 0x0206)
+	if (dmi_ver >= 0x020600)
 		sprintf(s, "%pUL", d);
 	else
 		sprintf(s, "%pUB", d);
@@ -473,7 +473,7 @@ static void __init dmi_format_ids(char *buf, size_t len)
  */
 static int __init dmi_present(const u8 *buf)
 {
-	int smbios_ver;
+	u32 smbios_ver;
 
 	if (memcmp(buf, "_SM_", 4) == 0 &&
 	    buf[5] < 32 && dmi_checksum(buf, buf[5])) {
@@ -506,14 +506,16 @@ static int __init dmi_present(const u8 *buf)
 		if (dmi_walk_early(dmi_decode) == 0) {
 			if (smbios_ver) {
 				dmi_ver = smbios_ver;
-				pr_info("SMBIOS %d.%d present.\n",
-				       dmi_ver >> 8, dmi_ver & 0xFF);
+				pr_info("SMBIOS %d.%d%s present.\n",
+					dmi_ver >> 8, dmi_ver & 0xFF,
+					(dmi_ver < 0x0300) ? "" : ".x");
 			} else {
 				dmi_ver = (buf[14] & 0xF0) << 4 |
 					   (buf[14] & 0x0F);
 				pr_info("Legacy DMI %d.%d present.\n",
 				       dmi_ver >> 8, dmi_ver & 0xFF);
 			}
+			dmi_ver <<= 8;
 			dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
 			printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);
 			return 0;
@@ -531,14 +533,16 @@ static int __init dmi_smbios3_present(const u8 *buf)
 {
 	if (memcmp(buf, "_SM3_", 5) == 0 &&
 	    buf[6] < 32 && dmi_checksum(buf, buf[6])) {
-		dmi_ver = get_unaligned_be16(buf + 7);
+		dmi_ver = get_unaligned_be32(buf + 6);
+		dmi_ver &= 0xFFFFFF;
 		dmi_num = 0;			/* No longer specified */
 		dmi_len = get_unaligned_le32(buf + 12);
 		dmi_base = get_unaligned_le64(buf + 16);
 
 		if (dmi_walk_early(dmi_decode) == 0) {
-			pr_info("SMBIOS %d.%d present.\n",
-				dmi_ver >> 8, dmi_ver & 0xFF);
+			pr_info("SMBIOS %d.%d.%d present.\n",
+				dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
+				dmi_ver & 0xFF);
 			dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
 			pr_debug("DMI: %s\n", dmi_ids_string);
 			return 0;
@@ -893,7 +897,7 @@ int dmi_walk(void (*decode)(const struct dmi_header *, void *),
 	if (buf == NULL)
 		return -1;
 
-	dmi_table(buf, dmi_len, dmi_num, decode, private_data);
+	dmi_table(buf, decode, private_data);
 
 	dmi_unmap(buf);
 	return 0;

drivers/firmware/efi/libstub/arm-stub.c

@@ -175,7 +175,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
 	unsigned long initrd_addr;
 	u64 initrd_size = 0;
 	unsigned long fdt_addr = 0;  /* Original DTB */
-	u64 fdt_size = 0;  /* We don't get size from configuration table */
+	unsigned long fdt_size = 0;
 	char *cmdline_ptr = NULL;
 	int cmdline_size = 0;
 	unsigned long new_fdt_addr;
@@ -239,8 +239,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
 	} else {
 		status = handle_cmdline_files(sys_table, image, cmdline_ptr,
 					      "dtb=",
-					      ~0UL, (unsigned long *)&fdt_addr,
-					      (unsigned long *)&fdt_size);
+					      ~0UL, &fdt_addr, &fdt_size);
 
 		if (status != EFI_SUCCESS) {
 			pr_efi_err(sys_table, "Failed to load device tree!\n");
@@ -252,7 +251,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
 		pr_efi(sys_table, "Using DTB from command line\n");
 	} else {
 		/* Look for a device tree configuration table entry. */
-		fdt_addr = (uintptr_t)get_fdt(sys_table);
+		fdt_addr = (uintptr_t)get_fdt(sys_table, &fdt_size);
 		if (fdt_addr)
 			pr_efi(sys_table, "Using DTB from configuration table\n");
 	}

drivers/firmware/efi/libstub/efistub.h

@@ -41,7 +41,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
 					    unsigned long fdt_addr,
 					    unsigned long fdt_size);
 
-void *get_fdt(efi_system_table_t *sys_table);
+void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size);
 
 void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
 		     unsigned long desc_size, efi_memory_desc_t *runtime_map,

drivers/firmware/efi/libstub/fdt.c

@@ -323,7 +323,7 @@ fail:
 	return EFI_LOAD_ERROR;
 }
 
-void *get_fdt(efi_system_table_t *sys_table)
+void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
 {
 	efi_guid_t fdt_guid = DEVICE_TREE_GUID;
 	efi_config_table_t *tables;
@@ -336,6 +336,11 @@ void *get_fdt(efi_system_table_t *sys_table)
 	for (i = 0; i < sys_table->nr_tables; i++)
 		if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
 			fdt = (void *) tables[i].table;
+			if (fdt_check_header(fdt) != 0) {
+				pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
+				return NULL;
+			}
+			*fdt_size = fdt_totalsize(fdt);
 			break;
 	 }