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kernel loader: don't try to reload modules already loaded by init

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Change-Id: I58fb2ee369bdb9f5c5f9e6c8ea3f15781ae60ece
This commit is contained in:
bigbiff
2021-10-09 12:37:29 -04:00
parent e6d833aeb3
commit 850fa28798
4 changed files with 129 additions and 91 deletions
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199
kernel_module_loader.cpp
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@@ -2,78 +2,108 @@
const std::vector<std::string> kernel_modules_requested = TWFunc::split_string(EXPAND(TW_LOAD_VENDOR_MODULES), ' ', true);
bool KernelModuleLoader::Load_Vendor_Modules(BOOT_MODE mode) {
// 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)
int modules_loaded = 0;
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)
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::vector<std::string> module_dirs;
std::vector<std::string> vendor_module_dirs;
LOGINFO("Attempting to load modules\n");
std::string vendor_base_dir(VENDOR_MODULE_DIR);
std::string base_dir(VENDOR_BOOT_MODULE_DIR);
std::vector<std::string> module_dirs;
std::vector<std::string> vendor_module_dirs;
TWPartition* ven = PartitionManager.Find_Partition_By_Path("/vendor");
vendor_module_dirs.push_back(VENDOR_MODULE_DIR);
vendor_module_dirs.push_back(vendor_base_dir + "/1.1");
TWPartition* ven = PartitionManager.Find_Partition_By_Path("/vendor");
vendor_module_dirs.push_back(VENDOR_MODULE_DIR);
vendor_module_dirs.push_back(vendor_base_dir + "/1.1");
module_dirs.push_back(base_dir);
module_dirs.push_back(base_dir);
struct utsname uts;
if (uname(&uts)) {
LOGERR("Unable to query kernel for version info\n");
}
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 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]);
for (auto&& module_dir:module_dirs) {
modules_loaded += Try_And_Load_Modules(module_dir);
if (modules_loaded >= expected_module_count) goto exit;
}
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);
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) {
LOGINFO("Checking mounted /vendor\n");
ven->Mount(true);
}
for (auto&& module_dir:vendor_module_dirs) {
modules_loaded += Try_And_Load_Modules(module_dir);
if (modules_loaded >= expected_module_count) goto exit;
}
for (auto&& module_dir:vendor_module_dirs) {
modules_loaded += Try_And_Load_Modules(module_dir, true);
if (modules_loaded >= expected_module_count) goto exit;
}
exit:
if (ven)
ven->UnMount(false);
if (ven)
ven->UnMount(false);
return true;
}
int KernelModuleLoader::Try_And_Load_Modules(std::string module_dir) {
LOGINFO("Checking directory: %s\n", module_dir.c_str());
std::string dest_module_dir;
dest_module_dir = "/tmp" + module_dir;
TWFunc::Recursive_Mkdir(dest_module_dir);
Copy_Modules_To_Tmpfs(module_dir);
Write_Module_List(dest_module_dir);
Modprobe m({dest_module_dir}, "modules.load.twrp");
m.EnableVerbose(true);
m.LoadListedModules(false);
int modules_loaded = m.GetModuleCount();
LOGINFO("Modules Loaded: %d\n", modules_loaded);
return modules_loaded;
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");
m.EnableVerbose(true);
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: %lu\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) {
@@ -81,6 +111,11 @@ bool KernelModuleLoader::Write_Module_List(std::string module_dir) {
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;
@@ -89,40 +124,40 @@ bool KernelModuleLoader::Write_Module_List(std::string module_dir) {
for (auto&& requested:kernel_modules_requested) {
if (kernel_module == requested) {
kernel_modules.push_back(kernel_module);
continue;
}
continue;
}
}
continue;
}
}
}
std::string module_file = module_dir + "/modules.load.twrp";
std::string module_file = module_dir + "/modules.load.twrp";
TWFunc::write_to_file(module_file, kernel_modules);
closedir(d);
closedir(d);
}
return true;
}
bool KernelModuleLoader::Copy_Modules_To_Tmpfs(std::string module_dir) {
std::string ramdisk_dir = "/tmp" + module_dir;
DIR* d;
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;
}
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;
}