[Qemu-devel] [PATCH] smbios: Add 1 terminator if there is any string field defined in given table.

[Lin Ma]

If user specifies binary file on command line to load smbios entries, then
will get error messages while decoding them in guest.

Reproducer:
1. dump a smbios table to a binary file from host or guest.(says table 1)
2. load the binary file through command line: 'qemu -smbios file=...'.
3. perform 'dmidecode' or 'dmidecode -t 1' in guest.

It reports 'Invalid entry length...' because qemu doesn't add terminator(s) for
the table correctly.
For smbios tables which have string field provided, qemu should add 1 
terminator.
For smbios tables which dont have string field provided, qemu should add 2.

This patch fixed the issue.

Signed-off-by: Lin Ma <address@hidden>
---
 hw/smbios/smbios.c         | 90 ++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/smbios/smbios.h | 44 +++++++++++++++++++++++
 2 files changed, 134 insertions(+)

diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 74c7102..6293bc5 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -885,6 +885,9 @@ void smbios_entry_add(QemuOpts *opts)
 {
     const char *val;
 
+    int i, terminator_count = 2, table_str_field_count = 0;
+    int *tables_str_field_offset = NULL;
+
     assert(!smbios_immutable);
 
     val = qemu_opt_get(opts, "file");
@@ -926,7 +929,94 @@ void smbios_entry_add(QemuOpts *opts)
             smbios_type4_count++;
         }
 
+        switch (header->type) {
+        case 0:
+            tables_str_field_offset = g_malloc0(sizeof(int) * \
+                                                TYPE_0_STR_FIELD_COUNT);
+            tables_str_field_offset = (int []){\
+                                    TYPE_0_STR_FIELD_OFFSET_VENDOR, \
+                                    TYPE_0_STR_FIELD_OFFSET_BIOS_VERSION, \
+                                    TYPE_0_STR_FIELD_OFFSET_BIOS_RELEASE_DATE};
+            table_str_field_count = sizeof(tables_str_field_offset) / \
+                                    sizeof(tables_str_field_offset[0]);
+            break;
+        case 1:
+            tables_str_field_offset = g_malloc0(sizeof(int) * \
+                                                TYPE_1_STR_FIELD_COUNT);
+            tables_str_field_offset = (int []){
+                                    TYPE_1_STR_FIELD_OFFSET_MANUFACTURER, \
+                                    TYPE_1_STR_FIELD_OFFSET_PRODUCT, \
+                                    TYPE_1_STR_FIELD_OFFSET_VERSION, \
+                                    TYPE_1_STR_FIELD_OFFSET_SERIAL, \
+                                    TYPE_1_STR_FIELD_OFFSET_SKU, \
+                                    TYPE_1_STR_FIELD_OFFSET_FAMILY};
+            table_str_field_count = sizeof(tables_str_field_offset) / \
+                                    sizeof(tables_str_field_offset[0]);
+            break;
+        case 2:
+            tables_str_field_offset = g_malloc0(sizeof(int) * \
+                                                TYPE_2_STR_FIELD_COUNT);
+            tables_str_field_offset = (int []){\
+                                    TYPE_2_STR_FIELD_OFFSET_MANUFACTURER, \
+                                    TYPE_2_STR_FIELD_OFFSET_PRODUCT, \
+                                    TYPE_2_STR_FIELD_OFFSET_VERSION, \
+                                    TYPE_2_STR_FIELD_OFFSET_SERIAL, \
+                                    TYPE_2_STR_FIELD_OFFSET_ASSET, \
+                                    TYPE_2_STR_FIELD_OFFSET_LOCATION};
+            table_str_field_count = sizeof(tables_str_field_offset) / \
+                                    sizeof(tables_str_field_offset[0]);
+            break;
+        case 3:
+            tables_str_field_offset = g_malloc0(sizeof(int) * \
+                                                TYPE_3_STR_FIELD_COUNT);
+            tables_str_field_offset = (int []){\
+                                    TYPE_3_STR_FIELD_OFFSET_MANUFACTURER, \
+                                    TYPE_3_STR_FIELD_OFFSET_VERSION, \
+                                    TYPE_3_STR_FIELD_OFFSET_SERIAL, \
+                                    TYPE_3_STR_FIELD_OFFSET_ASSET, \
+                                    TYPE_3_STR_FIELD_OFFSET_SKU};
+            table_str_field_count = sizeof(tables_str_field_offset) / \
+                                    sizeof(tables_str_field_offset[0]);
+            break;
+        case 4:
+            tables_str_field_offset = g_malloc0(sizeof(int) * \
+                                                TYPE_4_STR_FIELD_COUNT);
+            tables_str_field_offset = (int []){\
+                                    TYPE_4_STR_FIELD_OFFSET_SOCKET, \
+                                    
TYPE_4_STR_FIELD_OFFSET_PROCESSOR_MANUFACTURER, \
+                                    TYPE_4_STR_FIELD_OFFSET_PROCESSOR_VERSION, 
\
+                                    TYPE_4_STR_FIELD_OFFSET_SERIAL, \
+                                    TYPE_4_STR_FIELD_OFFSET_ASSET, \
+                                    TYPE_4_STR_FIELD_OFFSET_PART};
+            table_str_field_count = sizeof(tables_str_field_offset) / \
+                                    sizeof(tables_str_field_offset[0]);
+            break;
+        case 17:
+            tables_str_field_offset = g_malloc0(sizeof(int) * \
+                                                TYPE_17_STR_FIELD_COUNT);
+            tables_str_field_offset = (int []){\
+                                    TYPE_17_STR_FIELD_OFFSET_DEVICE_LOCATOR, \
+                                    TYPE_17_STR_FIELD_OFFSET_BANK_LOCATOR, \
+                                    TYPE_17_STR_FIELD_OFFSET_MANUFACTURER, \
+                                    TYPE_17_STR_FIELD_OFFSET_SERIAL, \
+                                    TYPE_17_STR_FIELD_OFFSET_ASSET, \
+                                    TYPE_17_STR_FIELD_OFFSET_PART};
+            table_str_field_count = sizeof(tables_str_field_offset) / \
+                                    sizeof(tables_str_field_offset[0]);
+            break;
+        default:
+            break;
+        }
+
+        for (i = 0; i < table_str_field_count; i++) {
+            if (*(uint8_t *)(smbios_tables + tables_str_field_offset[i]) > 0) {
+                terminator_count = 1;
+                break;
+            }
+        }
+
         smbios_tables_len += size;
+        smbios_tables_len += terminator_count;
         if (size > smbios_table_max) {
             smbios_table_max = size;
         }
diff --git a/include/hw/smbios/smbios.h b/include/hw/smbios/smbios.h
index 1cd53cc..6d59c3d 100644
--- a/include/hw/smbios/smbios.h
+++ b/include/hw/smbios/smbios.h
@@ -267,4 +267,48 @@ void smbios_get_tables(const struct smbios_phys_mem_area 
*mem_array,
                        const unsigned int mem_array_size,
                        uint8_t **tables, size_t *tables_len,
                        uint8_t **anchor, size_t *anchor_len);
+
+#define TYPE_0_STR_FIELD_OFFSET_VENDOR 0x4
+#define TYPE_0_STR_FIELD_OFFSET_BIOS_VERSION 0x5
+#define TYPE_0_STR_FIELD_OFFSET_BIOS_RELEASE_DATE 0x8
+#define TYPE_0_STR_FIELD_COUNT 3
+
+#define TYPE_1_STR_FIELD_OFFSET_MANUFACTURER 0x4
+#define TYPE_1_STR_FIELD_OFFSET_PRODUCT 0x5
+#define TYPE_1_STR_FIELD_OFFSET_VERSION 0x6
+#define TYPE_1_STR_FIELD_OFFSET_SERIAL 0x7
+#define TYPE_1_STR_FIELD_OFFSET_SKU 0x19
+#define TYPE_1_STR_FIELD_OFFSET_FAMILY 0x1a
+#define TYPE_1_STR_FIELD_COUNT 6
+
+#define TYPE_2_STR_FIELD_OFFSET_MANUFACTURER 0x4
+#define TYPE_2_STR_FIELD_OFFSET_PRODUCT 0x5
+#define TYPE_2_STR_FIELD_OFFSET_VERSION 0x6
+#define TYPE_2_STR_FIELD_OFFSET_SERIAL 0x7
+#define TYPE_2_STR_FIELD_OFFSET_ASSET 0x8
+#define TYPE_2_STR_FIELD_OFFSET_LOCATION 0xa
+#define TYPE_2_STR_FIELD_COUNT 6
+
+#define TYPE_3_STR_FIELD_OFFSET_MANUFACTURER 0x4
+#define TYPE_3_STR_FIELD_OFFSET_VERSION 0x6
+#define TYPE_3_STR_FIELD_OFFSET_SERIAL 0x7
+#define TYPE_3_STR_FIELD_OFFSET_ASSET 0x8
+#define TYPE_3_STR_FIELD_OFFSET_SKU 0x14
+#define TYPE_3_STR_FIELD_COUNT 5
+
+#define TYPE_4_STR_FIELD_OFFSET_SOCKET 0x4
+#define TYPE_4_STR_FIELD_OFFSET_PROCESSOR_MANUFACTURER 0x7
+#define TYPE_4_STR_FIELD_OFFSET_PROCESSOR_VERSION 0x10
+#define TYPE_4_STR_FIELD_OFFSET_SERIAL 0x20
+#define TYPE_4_STR_FIELD_OFFSET_ASSET 0x21
+#define TYPE_4_STR_FIELD_OFFSET_PART 0x22
+#define TYPE_4_STR_FIELD_COUNT 6
+
+#define TYPE_17_STR_FIELD_OFFSET_DEVICE_LOCATOR 0x10
+#define TYPE_17_STR_FIELD_OFFSET_BANK_LOCATOR 0x11
+#define TYPE_17_STR_FIELD_OFFSET_MANUFACTURER 0x17
+#define TYPE_17_STR_FIELD_OFFSET_SERIAL 0x18
+#define TYPE_17_STR_FIELD_OFFSET_ASSET 0x19
+#define TYPE_17_STR_FIELD_OFFSET_PART 0x1a
+#define TYPE_17_STR_FIELD_COUNT 6
 #endif /* QEMU_SMBIOS_H */
-- 
2.9.2