bump version to 2.9.1-9

[pve-qemu.git] / debian / patches / extra / 0030-i386-Change-X86CPUDefinition-model_id-to-const-char.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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_cpu_cpudef_class_init.

Reported-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 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 3d53cb4c86..c673521016 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -753,7 +753,7 @@ struct X86CPUDefinition {
     int model;
     int stepping;
     FeatureWordArray features;
-    char model_id[48];
+    const char *model_id;
 };
 
 static X86CPUDefinition builtin_x86_defs[] = {
@@ -922,6 +922,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             I486_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "pentium",
@@ -933,6 +934,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             PENTIUM_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "pentium2",
@@ -944,6 +946,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             PENTIUM2_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "pentium3",
@@ -955,6 +958,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_1_EDX] =
             PENTIUM3_FEATURES,
         .xlevel = 0,
+        .model_id = "",
     },
     {
         .name = "athlon",
@@ -2617,6 +2621,9 @@ 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);
-- 
2.11.0