-
Notifications
You must be signed in to change notification settings - Fork 0
/
kernel_module_loader.cpp
184 lines (164 loc) · 6.04 KB
/
kernel_module_loader.cpp
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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
#include "kernel_module_loader.hpp"
#include "common.h"
const std::vector<std::string> kernel_modules_requested = TWFunc::split_string(EXPAND(TW_LOAD_VENDOR_MODULES), ' ', true);
bool KernelModuleLoader::Load_Vendor_Modules() {
// check /lib/modules (ramdisk vendor_boot)
// check /lib/modules/N.N (ramdisk vendor_boot)
// check /lib/modules/N.N-gki (ramdisk vendor_boot)
// check /vendor/lib/modules (ramdisk)
// check /vendor/lib/modules/1.1 (ramdisk prebuilt modules)
// check /vendor/lib/modules/N.N (vendor mounted)
// check /vendor/lib/modules/N.N-gki (vendor mounted)
// check /vendor_dlkm/lib/modules (vendor_dlkm mounted)
int modules_loaded = 0;
LOGINFO("Attempting to load modules\n");
std::string vendor_base_dir(VENDOR_MODULE_DIR);
std::string base_dir(VENDOR_BOOT_MODULE_DIR);
std::string vendor_dlkm_base_dir(VENDOR_DLKM_MODULE_DIR);
std::vector<std::string> module_dirs;
std::vector<std::string> vendor_module_dirs;
TWPartition* ven = PartitionManager.Find_Partition_By_Path("/vendor");
TWPartition* ven_dlkm = PartitionManager.Find_Partition_By_Path("/vendor_dlkm");
vendor_module_dirs.push_back(VENDOR_MODULE_DIR);
vendor_module_dirs.push_back(vendor_base_dir + "/1.1");
module_dirs.push_back(base_dir);
struct utsname uts;
if (uname(&uts)) {
LOGERR("Unable to query kernel for version info\n");
}
std::string rls(uts.release);
std::vector<std::string> release = TWFunc::split_string(rls, '.', true);
int expected_module_count = kernel_modules_requested.size();
module_dirs.push_back(base_dir + "/" + release[0] + "." + release[1]);
std::string gki = "/" + release[0] + "." + release[1] + "-gki";
module_dirs.push_back(base_dir + gki);
vendor_module_dirs.push_back(vendor_base_dir + gki);
for (auto&& module_dir:module_dirs) {
modules_loaded += Try_And_Load_Modules(module_dir, false);
if (modules_loaded >= expected_module_count) goto exit;
}
for (auto&& module_dir:vendor_module_dirs) {
modules_loaded += Try_And_Load_Modules(module_dir, false);
if (modules_loaded >= expected_module_count) goto exit;
}
if (ven) {
LOGINFO("Checking mounted /vendor\n");
ven->Mount(true);
}
if (ven_dlkm) {
LOGINFO("Checking mounted /vendor_dlkm\n");
ven_dlkm->Mount(true);
}
for (auto&& module_dir:vendor_module_dirs) {
modules_loaded += Try_And_Load_Modules(module_dir, true);
if (modules_loaded >= expected_module_count) goto exit;
}
modules_loaded += Try_And_Load_Modules(vendor_dlkm_base_dir, true);
if (modules_loaded >= expected_module_count) goto exit;
exit:
if (ven)
ven->UnMount(false);
if (ven_dlkm)
ven_dlkm->UnMount(false);
android::base::SetProperty("twrp.modules.loaded", "true");
#ifdef TW_BATTERY_SYSFS_WAIT_SECONDS
TWFunc::Wait_For_Battery(std::chrono::seconds(TW_BATTERY_SYSFS_WAIT_SECONDS));
#endif
return true;
}
int KernelModuleLoader::Try_And_Load_Modules(std::string module_dir, bool vendor_is_mounted) {
LOGINFO("Checking directory: %s\n", module_dir.c_str());
int modules_loaded = 0;
std::string dest_module_dir;
dest_module_dir = "/tmp" + module_dir;
TWFunc::Recursive_Mkdir(dest_module_dir);
Copy_Modules_To_Tmpfs(module_dir);
if (!Write_Module_List(dest_module_dir))
return kernel_modules_requested.size();
if (!vendor_is_mounted && module_dir == "/vendor/lib/modules") {
module_dir = "/lib/modules";
}
LOGINFO("mounting %s on %s\n", dest_module_dir.c_str(), module_dir.c_str());
if (mount(dest_module_dir.c_str(), module_dir.c_str(), "", MS_BIND, NULL) == 0) {
Modprobe m({module_dir}, "modules.load.twrp", false);
m.LoadListedModules(false);
modules_loaded = m.GetModuleCount();
umount2(module_dir.c_str(), MNT_DETACH);
LOGINFO("Modules Loaded: %d\n", modules_loaded);
}
return modules_loaded;
}
std::vector<string> KernelModuleLoader::Skip_Loaded_Kernel_Modules() {
std::vector<string> kernel_modules = kernel_modules_requested;
std::vector<string> loaded_modules;
std::string kernel_module_file = "/proc/modules";
if (TWFunc::read_file(kernel_module_file, loaded_modules) < 0)
LOGINFO("failed to get loaded kernel modules\n");
LOGINFO("number of modules loaded by init: %zu\n", loaded_modules.size());
if (loaded_modules.size() == 0)
return kernel_modules;
for (auto&& module_line:loaded_modules) {
auto module = TWFunc::Split_String(module_line, " ")[0];
std::string full_module_name = module + ".ko";
auto found = std::find(kernel_modules.begin(), kernel_modules.end(), full_module_name);
if (found != kernel_modules.end()) {
LOGINFO("found module to dedupe: %s\n", (*found).c_str());
kernel_modules.erase(found);
}
}
return kernel_modules;
}
bool KernelModuleLoader::Write_Module_List(std::string module_dir) {
DIR* d;
struct dirent* de;
std::vector<std::string> kernel_modules;
d = opendir(module_dir.c_str());
auto deduped_modules = Skip_Loaded_Kernel_Modules();
if (deduped_modules.size() == 0) {
LOGINFO("Requested modules are loaded\n");
return false;
}
if (d != nullptr) {
while ((de = readdir(d)) != nullptr) {
std::string kernel_module = de->d_name;
if (de->d_type == DT_REG) {
if (android::base::EndsWith(kernel_module, ".ko")) {
for (auto&& requested:kernel_modules_requested) {
if (kernel_module == requested) {
kernel_modules.push_back(kernel_module);
continue;
}
}
continue;
}
}
}
std::string module_file = module_dir + "/modules.load.twrp";
TWFunc::write_to_file(module_file, kernel_modules);
closedir(d);
}
return true;
}
bool KernelModuleLoader::Copy_Modules_To_Tmpfs(std::string module_dir) {
std::string ramdisk_dir = "/tmp" + module_dir;
DIR* d;
struct dirent* de;
d = opendir(module_dir.c_str());
if (d != nullptr) {
while ((de = readdir(d)) != nullptr) {
std::string kernel_module = de->d_name;
if (de->d_type == DT_REG) {
std::string src = module_dir + "/" + de->d_name;
std::string dest = ramdisk_dir + "/" + de->d_name;
if (TWFunc::copy_file(src, dest, 0700, false) != 0) {
return false;
}
}
}
closedir(d);
} else {
LOGINFO("Unable to open module directory: %s. Skipping\n", module_dir.c_str());
return false;
}
return true;
}