A set of EFI fixes:

- Don't return a garbage screen info when EFI framebuffer is not available
 
  - Make the early EFI console work proper with wider fonts instead of drawing
    garbage
 
  - Prevent a memory buffer leak in allocate_e820()
 
  - Print the firmware error record proper so it can be decoded by users
 
  - Fix a symbol clash in the host tool build which only happens with newer
    compilers.
 
  - Add a missing check for the event log version of TPM which caused boot
    fails on several Dell systems due to an attempt to decode SHA-1 format
    with the crypto agile algorithm
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Merge tag 'efi-urgent-2020-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI fixes from Thomas Gleixner:
 "A set of EFI fixes:

   - Don't return a garbage screen info when EFI framebuffer is not
     available

   - Make the early EFI console work properly with wider fonts instead
     of drawing garbage

   - Prevent a memory buffer leak in allocate_e820()

   - Print the firmware error record properly so it can be decoded by
     users

   - Fix a symbol clash in the host tool build which only happens with
     newer compilers.

   - Add a missing check for the event log version of TPM which caused
     boot failures on several Dell systems due to an attempt to decode
     SHA-1 format with the crypto agile algorithm"

* tag 'efi-urgent-2020-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  tpm: check event log version before reading final events
  efi: Pull up arch-specific prototype efi_systab_show_arch()
  x86/boot: Mark global variables as static
  efi: cper: Add support for printing Firmware Error Record Reference
  efi/libstub/x86: Avoid EFI map buffer alloc in allocate_e820()
  efi/earlycon: Fix early printk for wider fonts
  efi/libstub: Avoid returning uninitialized data from setup_graphics()

arch/x86/boot/tools/build.c

@@ -59,14 +59,14 @@ u8 buf[SETUP_SECT_MAX*512];
 #define PECOFF_COMPAT_RESERVE 0x0
 #endif
 
-unsigned long efi32_stub_entry;
-unsigned long efi64_stub_entry;
-unsigned long efi_pe_entry;
-unsigned long efi32_pe_entry;
-unsigned long kernel_info;
-unsigned long startup_64;
-unsigned long _ehead;
-unsigned long _end;
+static unsigned long efi32_stub_entry;
+static unsigned long efi64_stub_entry;
+static unsigned long efi_pe_entry;
+static unsigned long efi32_pe_entry;
+static unsigned long kernel_info;
+static unsigned long startup_64;
+static unsigned long _ehead;
+static unsigned long _end;
 
 /*----------------------------------------------------------------------*/
 

drivers/firmware/efi/cper.c

@@ -407,6 +407,58 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	}
 }
 
+static const char * const fw_err_rec_type_strs[] = {
+	"IPF SAL Error Record",
+	"SOC Firmware Error Record Type1 (Legacy CrashLog Support)",
+	"SOC Firmware Error Record Type2",
+};
+
+static void cper_print_fw_err(const char *pfx,
+			      struct acpi_hest_generic_data *gdata,
+			      const struct cper_sec_fw_err_rec_ref *fw_err)
+{
+	void *buf = acpi_hest_get_payload(gdata);
+	u32 offset, length = gdata->error_data_length;
+
+	printk("%s""Firmware Error Record Type: %s\n", pfx,
+	       fw_err->record_type < ARRAY_SIZE(fw_err_rec_type_strs) ?
+	       fw_err_rec_type_strs[fw_err->record_type] : "unknown");
+	printk("%s""Revision: %d\n", pfx, fw_err->revision);
+
+	/* Record Type based on UEFI 2.7 */
+	if (fw_err->revision == 0) {
+		printk("%s""Record Identifier: %08llx\n", pfx,
+		       fw_err->record_identifier);
+	} else if (fw_err->revision == 2) {
+		printk("%s""Record Identifier: %pUl\n", pfx,
+		       &fw_err->record_identifier_guid);
+	}
+
+	/*
+	 * The FW error record may contain trailing data beyond the
+	 * structure defined by the specification. As the fields
+	 * defined (and hence the offset of any trailing data) vary
+	 * with the revision, set the offset to account for this
+	 * variation.
+	 */
+	if (fw_err->revision == 0) {
+		/* record_identifier_guid not defined */
+		offset = offsetof(struct cper_sec_fw_err_rec_ref,
+				  record_identifier_guid);
+	} else if (fw_err->revision == 1) {
+		/* record_identifier not defined */
+		offset = offsetof(struct cper_sec_fw_err_rec_ref,
+				  record_identifier);
+	} else {
+		offset = sizeof(*fw_err);
+	}
+
+	buf += offset;
+	length -= offset;
+
+	print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, buf, length, true);
+}
+
 static void cper_print_tstamp(const char *pfx,
 				   struct acpi_hest_generic_data_v300 *gdata)
 {
@@ -494,6 +546,16 @@ cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata
 		else
 			goto err_section_too_small;
 #endif
+	} else if (guid_equal(sec_type, &CPER_SEC_FW_ERR_REC_REF)) {
+		struct cper_sec_fw_err_rec_ref *fw_err = acpi_hest_get_payload(gdata);
+
+		printk("%ssection_type: Firmware Error Record Reference\n",
+		       newpfx);
+		/* The minimal FW Error Record contains 16 bytes */
+		if (gdata->error_data_length >= SZ_16)
+			cper_print_fw_err(newpfx, gdata, fw_err);
+		else
+			goto err_section_too_small;
 	} else {
 		const void *err = acpi_hest_get_payload(gdata);
 

drivers/firmware/efi/earlycon.c

@@ -114,14 +114,16 @@ static void efi_earlycon_write_char(u32 *dst, unsigned char c, unsigned int h)
 	const u32 color_black = 0x00000000;
 	const u32 color_white = 0x00ffffff;
 	const u8 *src;
-	u8 s8;
-	int m;
+	int m, n, bytes;
+	u8 x;
 
-	src = font->data + c * font->height;
-	s8 = *(src + h);
+	bytes = BITS_TO_BYTES(font->width);
+	src = font->data + c * font->height * bytes + h * bytes;
 
-	for (m = 0; m < 8; m++) {
-		if ((s8 >> (7 - m)) & 1)
+	for (m = 0; m < font->width; m++) {
+		n = m % 8;
+		x = *(src + m / 8);
+		if ((x >> (7 - n)) & 1)
 			*dst = color_white;
 		else
 			*dst = color_black;

drivers/firmware/efi/efi.c

@@ -130,11 +130,8 @@ static ssize_t systab_show(struct kobject *kobj,
 	if (efi.smbios != EFI_INVALID_TABLE_ADDR)
 		str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
 
-	if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86)) {
-		extern char *efi_systab_show_arch(char *str);
-
+	if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86))
 		str = efi_systab_show_arch(str);
-	}
 
 	return str - buf;
 }

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

@@ -60,7 +60,11 @@ static struct screen_info *setup_graphics(void)
 		si = alloc_screen_info();
 		if (!si)
 			return NULL;
-		efi_setup_gop(si, &gop_proto, size);
+		status = efi_setup_gop(si, &gop_proto, size);
+		if (status != EFI_SUCCESS) {
+			free_screen_info(si);
+			return NULL;
+		}
 	}
 	return si;
 }

drivers/firmware/efi/libstub/efistub.h

@@ -92,6 +92,19 @@ extern __pure efi_system_table_t  *efi_system_table(void);
 #define EFI_LOCATE_BY_REGISTER_NOTIFY		1
 #define EFI_LOCATE_BY_PROTOCOL			2
 
+/*
+ * An efi_boot_memmap is used by efi_get_memory_map() to return the
+ * EFI memory map in a dynamically allocated buffer.
+ *
+ * The buffer allocated for the EFI memory map includes extra room for
+ * a minimum of EFI_MMAP_NR_SLACK_SLOTS additional EFI memory descriptors.
+ * This facilitates the reuse of the EFI memory map buffer when a second
+ * call to ExitBootServices() is needed because of intervening changes to
+ * the EFI memory map. Other related structures, e.g. x86 e820ext, need
+ * to factor in this headroom requirement as well.
+ */
+#define EFI_MMAP_NR_SLACK_SLOTS	8
+
 struct efi_boot_memmap {
 	efi_memory_desc_t	**map;
 	unsigned long		*map_size;

drivers/firmware/efi/libstub/mem.c

@@ -5,8 +5,6 @@
 
 #include "efistub.h"
 
-#define EFI_MMAP_NR_SLACK_SLOTS	8
-
 static inline bool mmap_has_headroom(unsigned long buff_size,
 				     unsigned long map_size,
 				     unsigned long desc_size)

drivers/firmware/efi/libstub/tpm.c

@@ -54,7 +54,7 @@ void efi_retrieve_tpm2_eventlog(void)
 	efi_status_t status;
 	efi_physical_addr_t log_location = 0, log_last_entry = 0;
 	struct linux_efi_tpm_eventlog *log_tbl = NULL;
-	struct efi_tcg2_final_events_table *final_events_table;
+	struct efi_tcg2_final_events_table *final_events_table = NULL;
 	unsigned long first_entry_addr, last_entry_addr;
 	size_t log_size, last_entry_size;
 	efi_bool_t truncated;
@@ -127,7 +127,8 @@ void efi_retrieve_tpm2_eventlog(void)
 	 * Figure out whether any events have already been logged to the
 	 * final events structure, and if so how much space they take up
 	 */
-	final_events_table = get_efi_config_table(LINUX_EFI_TPM_FINAL_LOG_GUID);
+	if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
+		final_events_table = get_efi_config_table(LINUX_EFI_TPM_FINAL_LOG_GUID);
 	if (final_events_table && final_events_table->nr_events) {
 		struct tcg_pcr_event2_head *header;
 		int offset;

drivers/firmware/efi/libstub/x86-stub.c

@@ -606,24 +606,18 @@ static efi_status_t allocate_e820(struct boot_params *params,
 				  struct setup_data **e820ext,
 				  u32 *e820ext_size)
 {
-	unsigned long map_size, desc_size, buff_size;
-	struct efi_boot_memmap boot_map;
-	efi_memory_desc_t *map;
+	unsigned long map_size, desc_size, map_key;
 	efi_status_t status;
-	__u32 nr_desc;
+	__u32 nr_desc, desc_version;
 
-	boot_map.map		= ↦
-	boot_map.map_size	= &map_size;
-	boot_map.desc_size	= &desc_size;
-	boot_map.desc_ver	= NULL;
-	boot_map.key_ptr	= NULL;
-	boot_map.buff_size	= &buff_size;
+	/* Only need the size of the mem map and size of each mem descriptor */
+	map_size = 0;
+	status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key,
+			     &desc_size, &desc_version);
+	if (status != EFI_BUFFER_TOO_SMALL)
+		return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED;
 
-	status = efi_get_memory_map(&boot_map);
-	if (status != EFI_SUCCESS)
-		return status;
-
-	nr_desc = buff_size / desc_size;
+	nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS;
 
 	if (nr_desc > ARRAY_SIZE(params->e820_table)) {
 		u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);

drivers/firmware/efi/tpm.c

@@ -62,8 +62,11 @@ int __init efi_tpm_eventlog_init(void)
 	tbl_size = sizeof(*log_tbl) + log_tbl->size;
 	memblock_reserve(efi.tpm_log, tbl_size);
 
-	if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR)
+	if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR ||
+	    log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
+		pr_warn(FW_BUG "TPM Final Events table missing or invalid\n");
 		goto out;
+	}
 
 	final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl));
 

include/linux/cper.h

@@ -521,6 +521,15 @@ struct cper_sec_pcie {
 	u8	aer_info[96];
 };
 
+/* Firmware Error Record Reference, UEFI v2.7 sec N.2.10  */
+struct cper_sec_fw_err_rec_ref {
+	u8 record_type;
+	u8 revision;
+	u8 reserved[6];
+	u64 record_identifier;
+	guid_t record_identifier_guid;
+};
+
 /* Reset to default packing */
 #pragma pack()
 

include/linux/efi.h

@@ -1245,4 +1245,6 @@ struct linux_efi_memreserve {
 
 void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size);
 
+char *efi_systab_show_arch(char *str);
+
 #endif /* _LINUX_EFI_H */