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From: Eduardo Habkost <ehabkost@redhat.com>
Date: Tue, 9 Jan 2018 13:45:13 -0200
Subject: [PATCH] i386: Change X86CPUDefinition::model_id to const char*

It is valid to have a 48-character model ID on CPUID, however the
definition of X86CPUDefinition::model_id is char[48], which can
make the compiler drop the null terminator from the string.

If a CPU model happens to have 48 bytes on model_id, "-cpu help"
will print garbage and the object_property_set_str() call at
x86_cpu_load_def() will read data outside the model_id array.

We could increase the array size to 49, but this would mean the
compiler would not issue a warning if a 49-char string is used by
mistake for model_id.

To make things simpler, simply change model_id to be const char*,
and validate the string length using an assert() on
x86_register_cpudef_type().

Reported-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180109154519.25634-2-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
(cherry picked from commit 807e9869b8c4119b81df902625af818519e01759)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
(cherry picked from commit 4b220d88ba76fb2623ce4b8ba1f1eea66b82144e)
---
 target/i386/cpu.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index df73958b82..a861518790 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -749,7 +749,7 @@ struct X86CPUDefinition {
     int model;
     int stepping;
     FeatureWordArray features;
-    char model_id[48];
+    const char *model_id;
 };
 
 static X86CPUDefinition builtin_x86_defs[] = {
@@ -918,6 +918,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             I486_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "pentium",
@@ -929,6 +930,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             PENTIUM_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "pentium2",
@@ -940,6 +942,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             PENTIUM2_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "pentium3",
@@ -951,6 +954,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             PENTIUM3_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "athlon",
@@ -2670,6 +2674,9 @@ static void x86_register_cpudef_type(X86CPUDefinition *def)
      * they shouldn't be set on the CPU model table.
      */
     assert(!(def->features[FEAT_8000_0001_EDX] & CPUID_EXT2_AMD_ALIASES));
+    /* catch mistakes instead of silently truncating model_id when too long */
+    assert(def->model_id && strlen(def->model_id) <= 48);
+
 
     type_register(&ti);
     g_free(typename);