1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/policy/win/sandbox_warmup.h"
#include <windows.h>
#include "base/check.h"
#include "base/no_destructor.h"
#include "sandbox/policy/win/hook_util/hook_util.h"
#include "sandbox/win/src/win_utils.h"
namespace sandbox::policy {
namespace {
// Stores the default lcid.
LCID g_user_default_lcid = 0;
// Returns the lcid seen at startup.
LCID HookedGetUserDefaultLCID() {
return g_user_default_lcid;
}
} // namespace
void WarmupRandomnessInfrastructure() {
sandbox::WarmupRandomnessInfrastructure();
}
bool HookDwriteGetUserDefaultLCID() {
// Should not be called twice.
static bool first_call = true;
CHECK(first_call);
first_call = false;
// In Chrome dwrite.dll should be loaded as it is an import of chrome.dll.
HMODULE h_dwrite = ::GetModuleHandleW(L"dwrite.dll");
if (!h_dwrite) {
return false;
}
// Store this for our hook to return if it is called.
g_user_default_lcid = GetUserDefaultLCID();
// We never call the original version of GetUserDefaultLCID and never unhook.
static base::NoDestructor<sandbox::policy::IATHook> dwrite_hook;
// dwrite.dll imports 1-2-1 in Windows 10 10240 & 1-2-0 in Windows 11 22631.
const char* apisets[] = {"api-ms-win-core-localization-l1-2-0.dll",
"api-ms-win-core-localization-l1-2-1.dll",
"api-ms-win-core-localization-l1-2-2.dll"};
for (const char* apiset : apisets) {
if (NO_ERROR ==
dwrite_hook->Hook(h_dwrite, apiset, "GetUserDefaultLCID",
reinterpret_cast<void*>(HookedGetUserDefaultLCID))) {
return true;
}
}
return false;
}
} // namespace sandbox::policy
|
