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i386: Change X86CPUDefinition::model_id to const char*

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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().

Backports commit 4b220d88ba76fb2623ce4b8ba1f1eea66b82144e from qemu
This commit is contained in:
Eduardo Habkost 2018-03-05 12:32:35 -05:00 committed by Lioncash
parent d89704eb0f
commit 181524d695
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 8 additions and 1 deletions
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9
qemu/target/i386/cpu.c
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@ -883,7 +883,7 @@ struct X86CPUDefinition {
int model;
int stepping;
FeatureWordArray features;
char model_id[48];
const char *model_id;
bool cache_info_passthrough;
};
@ -1094,6 +1094,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
// FEAT_1_EDX
I486_FEATURES,
},
"",
},
{
"pentium",
@ -1104,6 +1105,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
// FEAT_1_EDX
PENTIUM_FEATURES,
},
"",
},
{
"pentium2",
@ -1114,6 +1116,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
// FEAT_1_EDX
PENTIUM2_FEATURES,
},
"",
},
{
"pentium3",
@ -1124,6 +1127,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
// FEAT_1_EDX
PENTIUM3_FEATURES,
},
"",
},
{
"athlon",
@ -2526,6 +2530,9 @@ static void x86_register_cpudef_type(struct uc_struct *uc, X86CPUDefinition *def
x86_cpu_cpudef_class_init,
};
/* catch mistakes instead of silently truncating model_id when too long */
assert(def->model_id && strlen(def->model_id) <= 48);
type_register(uc, &ti);
g_free(typename);
}