620 lines
16 KiB
C++
620 lines
16 KiB
C++
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#include <sys/mount.h>
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#include <map>
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#include <utility>
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#include <utils.hpp>
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#include <magisk.hpp>
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#include <selinux.hpp>
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#include <daemon.hpp>
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#include <resetprop.hpp>
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#include <flags.h>
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using namespace std;
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#define SKIP_DOTS {\
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if (entry->d_name == "."sv || entry->d_name == ".."sv) \
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continue;\
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}
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#ifdef MAGISK_DEBUG
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#define VLOGI(tag, from, to) LOGI("%-8s: %s <- %s\n", tag, to, from)
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#else
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#define VLOGI(tag, from, to) LOGI("%-8s: %s\n", tag, to)
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#endif
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#define TYPE_INTER (1 << 0) /* intermediate node */
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#define TYPE_MIRROR (1 << 1) /* mount from mirror */
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#define TYPE_SKEL (1 << 2) /* replace with tmpfs */
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#define TYPE_MODULE (1 << 3) /* mount from module */
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#define TYPE_ROOT (1 << 4) /* partition root */
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#define TYPE_DIR (TYPE_INTER|TYPE_MIRROR|TYPE_SKEL|TYPE_ROOT)
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vector<string> module_list;
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class node_entry;
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class dir_node;
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class inter_node;
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class mirror_node;
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class skel_node;
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class module_node;
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class root_node;
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static void merge_node(node_entry *a, node_entry *b);
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template<class T> static bool isa(node_entry *node);
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static int bind_mount(const char *from, const char *to) {
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int ret = xmount(from, to, nullptr, MS_BIND, nullptr);
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if (ret == 0)
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VLOGI("bind_mnt", from, to);
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return ret;
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}
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template<class T> uint8_t type_id() { return 0; }
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template<> uint8_t type_id<dir_node>() { return TYPE_DIR; }
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template<> uint8_t type_id<inter_node>() { return TYPE_INTER; }
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template<> uint8_t type_id<mirror_node>() { return TYPE_MIRROR; }
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template<> uint8_t type_id<skel_node>() { return TYPE_SKEL; }
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template<> uint8_t type_id<module_node>() { return TYPE_MODULE; }
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template<> uint8_t type_id<root_node>() { return TYPE_ROOT; }
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class node_entry {
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public:
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virtual ~node_entry() = default;
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bool is_dir() { return file_type() == DT_DIR; }
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bool is_lnk() { return file_type() == DT_LNK; }
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bool is_reg() { return file_type() == DT_REG; }
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uint8_t type() { return node_type; }
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const string &name() { return _name; }
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dir_node *parent() { return _parent; }
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virtual void mount() = 0;
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static string module_mnt;
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static string mirror_dir;
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protected:
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template<class T>
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node_entry(const char *name, uint8_t file_type, T*)
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: _name(name), _file_type(file_type), node_type(type_id<T>()) {}
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template<class T>
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node_entry(T*) : node_type(type_id<T>()) {}
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// Paths
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const string &node_path();
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string mirror_path() { return mirror_dir + node_path(); }
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void create_and_mount(const string &src);
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/* Use top bit of _file_type for node exist status */
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bool exist() { return static_cast<bool>(_file_type & (1 << 7)); }
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void set_exist() { _file_type |= (1 << 7); }
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uint8_t file_type() { return static_cast<uint8_t>(_file_type & ~(1 << 7)); }
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private:
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friend void merge_node(node_entry *a, node_entry *b);
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friend class dir_node;
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bool need_clone();
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// Node properties
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string _name;
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uint8_t _file_type;
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uint8_t node_type;
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dir_node *_parent = nullptr;
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// Cache
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string _node_path;
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};
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class dir_node : public node_entry {
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public:
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friend void merge_node(node_entry *a, node_entry *b);
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typedef map<string_view, node_entry *> map_type;
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typedef map_type::iterator map_iter;
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~dir_node() override;
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// Return false to indicate need to upgrade to module
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bool collect_files(const char *module, int dfd);
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// Return false to indicate need to upgrade to skeleton
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bool prepare();
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// Default directory mount logic
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void mount() override {
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for (auto &pair : children)
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pair.second->mount();
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}
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/***************
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* Tree Methods
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***************/
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bool is_empty() { return children.empty(); }
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template<class T>
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T *child(string_view name) { return iter_to_node<T>(children.find(name)); }
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// Lazy val
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root_node *root() {
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if (!_root)
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_root = _parent->root();
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return _root;
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}
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// Return child with name or nullptr
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node_entry *extract(string_view name);
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// Return false if rejected
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bool insert(node_entry *node) {
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return node
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? iter_to_node(insert(children.find(node->_name), node->node_type,
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[=](auto _) { return node; })) != nullptr
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: false;
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}
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// Return inserted node or null if rejected
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template<class T, class ...Args>
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T *emplace(string_view name, Args &...args) {
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return iter_to_node<T>(insert(children.find(name), type_id<T>(),
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[&](auto _) { return new T(std::forward<Args>(args)...); }));
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}
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// Return inserted node, existing node with same rank, or null
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template<class T, class ...Args>
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T *emplace_or_get(string_view name, Args &...args) {
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return iter_to_node<T>(insert(children.find(name), type_id<T>(),
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[&](auto _) { return new T(std::forward<Args>(args)...); }, true));
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}
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// Return upgraded node or null if rejected
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template<class T, class ...Args>
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T *upgrade(string_view name, Args &...args) {
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return iter_to_node<T>(upgrade<T>(children.find(name), args...));
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}
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protected:
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template<class T>
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dir_node(const char *name, uint8_t file_type, T *self) : node_entry(name, file_type, self) {
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if constexpr (std::is_same_v<T, root_node>)
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_root = self;
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}
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template<class T>
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dir_node(node_entry *node, T *self) : node_entry(self) {
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merge_node(this, node);
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if constexpr (std::is_same_v<T, root_node>)
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_root = self;
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}
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template<class T>
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dir_node(const char *name, T *self) : dir_node(name, DT_DIR, self) {}
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private:
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// Root node lookup cache
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root_node *_root;
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// dir nodes host children
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map_type children;
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template<class T = node_entry>
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T *iter_to_node(const map_iter &it) {
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return reinterpret_cast<T*>(it == children.end() ? nullptr : it->second);
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}
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/* fn signature: (node_ent *&) -> node_ent *
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* fn gets reference to the existing node, may be null.
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* If fn consumes input, need to set reference to null.
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* Returns new node or null to reject the insertion. */
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template<typename Func>
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map_iter insert(map_iter it, uint8_t type, Func fn, bool allow_same = false);
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template<class To, class From = node_entry, class ...Args>
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map_iter upgrade(map_iter it, Args &...args) {
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return insert(it, type_id<To>(), [&](node_entry *&ex) -> node_entry * {
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if (!ex)
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return nullptr;
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if constexpr (!std::is_same_v<From, node_entry>) {
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// Type check if specific type is selected
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if (!isa<From>(ex))
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return nullptr;
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}
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auto node = new To(reinterpret_cast<From *>(ex), std::forward<Args>(args)...);
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ex = nullptr;
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return node;
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});
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}
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};
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class root_node : public dir_node {
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public:
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root_node(const char *name) : dir_node(name, this), prefix("") {}
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root_node(node_entry *node) : dir_node(node, this), prefix("/system") {}
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const char * const prefix;
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};
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class inter_node : public dir_node {
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public:
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inter_node(const char *name, const char *module) : dir_node(name, this), module(module) {}
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private:
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const char *module;
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friend class module_node;
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};
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void node_entry::create_and_mount(const string &src) {
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const string &dest = node_path();
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if (is_lnk()) {
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VLOGI("cp_link", src.data(), dest.data());
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cp_afc(src.data(), dest.data());
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} else {
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if (is_dir())
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xmkdir(dest.data(), 0);
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else if (is_reg())
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close(xopen(dest.data(), O_RDONLY | O_CREAT | O_CLOEXEC, 0));
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else
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return;
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bind_mount(src.data(), dest.data());
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}
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}
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class module_node : public node_entry {
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public:
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module_node(const char *module, dirent *entry)
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: node_entry(entry->d_name, entry->d_type, this), module(module) {}
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module_node(node_entry *node, const char *module) : node_entry(this), module(module) {
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merge_node(this, node);
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}
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module_node(inter_node *node) : module_node(node, node->module) {}
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void mount() override {
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string src = module_mnt + module + parent()->root()->prefix + node_path();
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if (exist())
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clone_attr(mirror_path().data(), src.data());
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if (isa<skel_node>(parent()))
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create_and_mount(src);
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else if (is_dir() || is_reg())
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bind_mount(src.data(), node_path().data());
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}
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private:
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const char *module;
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};
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class mirror_node : public dir_node {
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public:
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mirror_node(dirent *entry) : dir_node(entry->d_name, entry->d_type, this) {}
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void mount() override {
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create_and_mount(mirror_path());
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dir_node::mount();
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}
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};
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class skel_node : public dir_node {
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public:
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skel_node(node_entry *node) : dir_node(node, this) {}
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void mount() override {
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string src = mirror_path();
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const string &dest = node_path();
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file_attr a;
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getattr(src.data(), &a);
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xmount("tmpfs", dest.data(), "tmpfs", 0, nullptr);
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VLOGI("mnt_tmp", "tmpfs", dest.data());
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setattr(dest.data(), &a);
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dir_node::mount();
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}
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};
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// Poor man's dynamic cast without RTTI
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template<class T>
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static bool isa(node_entry *node) {
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return node && (node->type() & type_id<T>());
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}
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template<class T>
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static T *dyn_cast(node_entry *node) {
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return isa<T>(node) ? reinterpret_cast<T*>(node) : nullptr;
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}
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// Merge b -> a, b will be deleted
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static void merge_node(node_entry *a, node_entry *b) {
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a->_name.swap(b->_name);
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a->_file_type = b->_file_type;
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a->_parent = b->_parent;
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// Merge children if both is dir
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if (auto aa = dyn_cast<dir_node>(a); aa) {
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if (auto bb = dyn_cast<dir_node>(b); bb) {
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aa->children.merge(bb->children);
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for (auto &pair : aa->children)
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pair.second->_parent = aa;
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}
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}
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delete b;
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}
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string node_entry::module_mnt;
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string node_entry::mirror_dir;
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const string &node_entry::node_path() {
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if (_parent && _node_path.empty())
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_node_path = _parent->node_path() + '/' + _name;
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return _node_path;
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}
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dir_node::~dir_node() {
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for (auto &it : children)
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delete it.second;
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children.clear();
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}
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template<typename Func>
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dir_node::map_iter dir_node::insert(dir_node::map_iter it, uint8_t type, Func fn, bool allow_same) {
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node_entry *node = nullptr;
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if (it != children.end()) {
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if (it->second->node_type < type) {
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// Upgrade existing node only if higher precedence
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node = fn(it->second);
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if (!node)
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return children.end();
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if (it->second)
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merge_node(node, it->second);
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it = children.erase(it);
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// Minor optimization to make insert O(1) by using hint
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if (it == children.begin())
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it = children.emplace(node->_name, node).first;
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else
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it = children.emplace_hint(--it, node->_name, node);
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} else {
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if (allow_same && it->second->node_type == type)
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return it;
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return children.end();
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}
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} else {
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node = fn(node);
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if (!node)
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return it;
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node->_parent = this;
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it = children.emplace(node->_name, node).first;
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}
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return it;
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}
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node_entry* dir_node::extract(string_view name) {
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auto it = children.find(name);
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if (it != children.end()) {
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auto ret = it->second;
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children.erase(it);
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return ret;
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}
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return nullptr;
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}
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bool node_entry::need_clone() {
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/* We need to upgrade parent to skeleton if:
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* - Target does not exist
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* - Source or target is a symlink */
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bool clone = false;
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struct stat st;
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if (lstat(node_path().data(), &st) != 0) {
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clone = true;
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} else {
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set_exist(); // cache exist result
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if (is_lnk() || S_ISLNK(st.st_mode))
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clone = true;
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}
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return clone;
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}
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bool dir_node::prepare() {
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bool upgrade_skel = false;
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for (auto it = children.begin(); it != children.end();) {
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auto child = it->second;
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if (child->need_clone()) {
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if (node_type > type_id<skel_node>()) {
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// Upgrade will fail, remove unsupported child node
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delete child;
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it = children.erase(it);
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continue;
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}
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// Tell parent to upgrade self to skel
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upgrade_skel = true;
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// If child is inter_node, upgrade to module
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if (auto nit = upgrade<module_node, inter_node>(it); nit != children.end()) {
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it = nit;
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goto increment;
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}
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}
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if (auto dn = dyn_cast<dir_node>(child); dn && dn->is_dir() && !dn->prepare()) {
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// Upgrade child to skeleton (shall always success)
|
||
|
it = upgrade<skel_node>(it);
|
||
|
auto skel = iter_to_node<skel_node>(it);
|
||
|
string mirror = skel->mirror_path();
|
||
|
auto dir = xopen_dir(mirror.data());
|
||
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
||
|
SKIP_DOTS
|
||
|
// Insert mirror nodes
|
||
|
skel->emplace<mirror_node>(entry->d_name, entry);
|
||
|
}
|
||
|
}
|
||
|
increment:
|
||
|
++it;
|
||
|
}
|
||
|
return !upgrade_skel;
|
||
|
}
|
||
|
|
||
|
bool dir_node::collect_files(const char *module, int dfd) {
|
||
|
auto dir = xopen_dir(xopenat(dfd, _name.data(), O_RDONLY | O_CLOEXEC));
|
||
|
if (!dir)
|
||
|
return true;
|
||
|
|
||
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
||
|
SKIP_DOTS
|
||
|
if (entry->d_name == ".replace"sv) {
|
||
|
// Stop traversing and tell parent to upgrade self to module
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (entry->d_type == DT_DIR) {
|
||
|
// Need check cause emplace could fail due to previous module dir replace
|
||
|
if (auto dn = emplace_or_get<inter_node>(entry->d_name, entry->d_name, module); dn &&
|
||
|
!dn->collect_files(module, dirfd(dir.get()))) {
|
||
|
// Upgrade node to module due to '.replace'
|
||
|
upgrade<module_node>(dn->name(), module);
|
||
|
}
|
||
|
} else {
|
||
|
emplace<module_node>(entry->d_name, module, entry);
|
||
|
}
|
||
|
}
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
static void mount_modules() {
|
||
|
node_entry::mirror_dir = MAGISKTMP + "/" MIRRDIR;
|
||
|
node_entry::module_mnt = MAGISKTMP + "/" MODULEMNT "/";
|
||
|
|
||
|
auto root = make_unique<root_node>("");
|
||
|
auto system = new root_node("system");
|
||
|
root->insert(system);
|
||
|
|
||
|
char buf1[4096];
|
||
|
char buf2[4096];
|
||
|
LOGI("* Loading modules\n");
|
||
|
for (const auto &m : module_list) {
|
||
|
auto module = m.data();
|
||
|
char *b1 = buf1 + sprintf(buf1, MODULEROOT "/%s/", module);
|
||
|
|
||
|
// Read props
|
||
|
strcpy(b1, "system.prop");
|
||
|
if (access(buf1, F_OK) == 0) {
|
||
|
LOGI("%s: loading [system.prop]\n", module);
|
||
|
load_prop_file(buf1, false);
|
||
|
}
|
||
|
|
||
|
// Copy sepolicy rules
|
||
|
strcpy(b1, "sepolicy.rule");
|
||
|
char *b2 = buf2 + sprintf(buf2, "%s/" MIRRDIR "/persist", MAGISKTMP.data());
|
||
|
if (access(buf1, F_OK) == 0 && access(buf2, F_OK) == 0) {
|
||
|
b2 += sprintf(b2, "/magisk/%s", module);
|
||
|
xmkdirs(buf2, 0755);
|
||
|
strcpy(b2, "/sepolicy.rule");
|
||
|
cp_afc(buf1, buf2);
|
||
|
}
|
||
|
|
||
|
// Check whether skip mounting
|
||
|
strcpy(b1, "skip_mount");
|
||
|
if (access(buf1, F_OK) == 0)
|
||
|
continue;
|
||
|
|
||
|
// Double check whether the system folder exists
|
||
|
strcpy(b1, "system");
|
||
|
if (access(buf1, F_OK) != 0)
|
||
|
continue;
|
||
|
|
||
|
LOGI("%s: loading mount files\n", module);
|
||
|
b1[-1] = '\0';
|
||
|
int fd = xopen(buf1, O_RDONLY | O_CLOEXEC);
|
||
|
system->collect_files(module, fd);
|
||
|
close(fd);
|
||
|
}
|
||
|
if (system->is_empty())
|
||
|
return;
|
||
|
|
||
|
// Handle special read-only partitions
|
||
|
for (const char *part : { "/vendor", "/product", "/system_ext" }) {
|
||
|
struct stat st;
|
||
|
if (lstat(part, &st) == 0 && S_ISDIR(st.st_mode)) {
|
||
|
if (auto old = system->extract(part + 1); old) {
|
||
|
auto new_node = new root_node(old);
|
||
|
root->insert(new_node);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
root->prepare();
|
||
|
root->mount();
|
||
|
}
|
||
|
|
||
|
static void prepare_modules() {
|
||
|
// Upgrade modules
|
||
|
if (auto dir = open_dir(MODULEUPGRADE); dir) {
|
||
|
int ufd = dirfd(dir.get());
|
||
|
int mfd = xopen(MODULEROOT, O_RDONLY | O_CLOEXEC);
|
||
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
||
|
if (entry->d_type == DT_DIR) {
|
||
|
if (entry->d_name == "."sv || entry->d_name == ".."sv)
|
||
|
continue;
|
||
|
// Cleanup old module if exists
|
||
|
if (faccessat(mfd, entry->d_name, F_OK, 0) == 0) {
|
||
|
frm_rf(xopenat(mfd, entry->d_name, O_RDONLY | O_CLOEXEC));
|
||
|
unlinkat(mfd, entry->d_name, AT_REMOVEDIR);
|
||
|
}
|
||
|
LOGI("Upgrade / New module: %s\n", entry->d_name);
|
||
|
renameat(ufd, entry->d_name, mfd, entry->d_name);
|
||
|
}
|
||
|
}
|
||
|
close(mfd);
|
||
|
rm_rf(MODULEUPGRADE);
|
||
|
}
|
||
|
|
||
|
// Setup module mount (workaround nosuid selabel issue)
|
||
|
auto src = MAGISKTMP + "/" MIRRDIR MODULEROOT;
|
||
|
auto dest = MAGISKTMP + "/" MODULEMNT;
|
||
|
bind_mount(src.data(), dest.data());
|
||
|
|
||
|
restorecon();
|
||
|
chmod(SECURE_DIR, 0700);
|
||
|
}
|
||
|
|
||
|
static void collect_modules() {
|
||
|
auto dir = xopen_dir(MODULEROOT);
|
||
|
int dfd = dirfd(dir.get());
|
||
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
||
|
if (entry->d_type == DT_DIR) {
|
||
|
if (entry->d_name == "."sv || entry->d_name == ".."sv || entry->d_name == ".core"sv)
|
||
|
continue;
|
||
|
|
||
|
int modfd = xopenat(dfd, entry->d_name, O_RDONLY);
|
||
|
run_finally f([=]{ close(modfd); });
|
||
|
|
||
|
if (faccessat(modfd, "remove", F_OK, 0) == 0) {
|
||
|
LOGI("%s: remove\n", entry->d_name);
|
||
|
auto uninstaller = MODULEROOT + "/"s + entry->d_name + "/uninstall.sh";
|
||
|
if (access(uninstaller.data(), F_OK) == 0)
|
||
|
exec_script(uninstaller.data());
|
||
|
frm_rf(xdup(modfd));
|
||
|
unlinkat(dfd, entry->d_name, AT_REMOVEDIR);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
unlinkat(modfd, "update", 0);
|
||
|
|
||
|
if (faccessat(modfd, "disable", F_OK, 0) != 0)
|
||
|
module_list.emplace_back(entry->d_name);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void handle_modules() {
|
||
|
prepare_modules();
|
||
|
collect_modules();
|
||
|
|
||
|
// Execute module scripts
|
||
|
LOGI("* Running module post-fs-data scripts\n");
|
||
|
exec_module_script("post-fs-data", module_list);
|
||
|
|
||
|
// Recollect modules (module scripts could remove itself)
|
||
|
module_list.clear();
|
||
|
collect_modules();
|
||
|
|
||
|
mount_modules();
|
||
|
}
|