*/
ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS = 0x100,
+ /* This flag used to load library in a different namespace. The namespace is
+ * specified in library_namespace.
+ */
+ ANDROID_DLEXT_USE_NAMESPACE = 0x200,
+
/* Mask of valid bits */
ANDROID_DLEXT_VALID_FLAG_BITS = ANDROID_DLEXT_RESERVED_ADDRESS |
ANDROID_DLEXT_RESERVED_ADDRESS_HINT |
ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET |
ANDROID_DLEXT_FORCE_LOAD |
ANDROID_DLEXT_FORCE_FIXED_VADDR |
- ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS,
+ ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS |
+ ANDROID_DLEXT_USE_NAMESPACE,
};
+struct android_namespace_t;
+
typedef struct {
uint64_t flags;
void* reserved_addr;
int relro_fd;
int library_fd;
off64_t library_fd_offset;
+ struct android_namespace_t* library_namespace;
} android_dlextinfo;
extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo);
+/*
+ * Initializes public namespace. The path is the list of sonames
+ * separated by colon. Example: "libc.so:libm.so:libdl.so".
+ *
+ * The libraries in this list should be loaded prior to this call.
+ */
+extern bool android_init_public_namespace(const char* path);
+
+/*
+ * Creates new linker namespace.
+ * ld_library_path and default_library_path represent the search path
+ * for the libraries in the namespace.
+ *
+ * The libraries in the namespace are searched by folowing order:
+ * 1. ld_library_path (Think of this as namespace-local LD_LIBRARY_PATH)
+ * 2. In directories specified by DT_RUNPATH of the "needed by" binary.
+ * 3. deault_library_path (This of this as namespace-local default library path)
+ *
+ * When is_isolated is true the resulted namespace requires all of the libraries
+ * to be on the search path; the search_path is ld_library_path:default_library_path.
+ *
+ * If a library or any of its dependencies are outside of the search path and not
+ * part of the public namespace dlopen will fail.
+ */
+extern struct android_namespace_t* android_create_namespace(const char* name,
+ const char* ld_library_path,
+ const char* default_library_path,
+ bool is_isolated);
+
__END_DECLS
#endif /* __ANDROID_DLEXT_H__ */
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc __unused, int* pcount __unused) { return 0; }
#endif
-int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data) __unused, void* data __unused) { return 0; }
+int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data) __unused,
+ void* data __unused) {
+ return 0;
+}
void android_get_LD_LIBRARY_PATH(char* buffer __unused, size_t buffer_size __unused) { }
void android_update_LD_LIBRARY_PATH(const char* ld_library_path __unused) { }
-void* android_dlopen_ext(const char* filename __unused, int flag __unused, const android_dlextinfo* extinfo __unused) { return 0; }
+void* android_dlopen_ext(const char* filename __unused, int flag __unused,
+ const android_dlextinfo* extinfo __unused) {
+ return 0;
+}
void android_set_application_target_sdk_version(uint32_t target __unused) { }
uint32_t android_get_application_target_sdk_version() { return 0; }
+
+bool android_init_public_namespace(const char* paths __unused) { return false; }
+struct android_namespace_t* android_create_namespace(const char* name __unused,
+ const char* ld_library_path __unused,
+ const char* default_library_path __unused,
+ bool isolated __unused) {
+ return 0;
+}
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
*;
};
+LIBC_N {
+ global:
+ android_init_public_namespace;
+ android_create_namespace;
+} LIBC;
+
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;
dlfcn.cpp \
linker.cpp \
linker_allocator.cpp \
- linker_sdk_versions.cpp \
linker_block_allocator.cpp \
linker_libc_support.c \
linker_mapped_file_fragment.cpp \
linker_memory.cpp \
linker_phdr.cpp \
+ linker_sdk_versions.cpp \
linker_utils.cpp \
rt.cpp \
const ElfW(Sym)* sym = nullptr;
void* caller_addr = __builtin_return_address(0);
soinfo* caller = find_containing_library(caller_addr);
+ if (caller == nullptr) {
+ char buf[256];
+ __libc_format_buffer(buf, sizeof(buf), "dlsym couldn't locate its caller address=%p; "
+ "the caller was code not loaded by the dynamic linker", caller_addr);
+ __bionic_format_dlerror(buf, nullptr);
+ return nullptr;
+ }
if (handle == RTLD_DEFAULT || handle == RTLD_NEXT) {
- sym = dlsym_linear_lookup(symbol, &found, caller, handle);
+ sym = dlsym_linear_lookup(caller->get_namespace(), symbol, &found, caller, handle);
} else {
sym = dlsym_handle_lookup(reinterpret_cast<soinfo*>(handle), &found, symbol);
}
return get_application_target_sdk_version();
}
+bool android_init_public_namespace(const char* path) {
+ ScopedPthreadMutexLocker locker(&g_dl_mutex);
+ bool success = init_public_namespace(path);
+ if (!success) {
+ __bionic_format_dlerror("android_init_public_namespace failed", linker_get_error_buffer());
+ }
+
+ return success;
+}
+
+android_namespace_t* android_create_namespace(const char* name, const char* ld_library_path,
+ const char* default_library_path, bool is_isolated) {
+ ScopedPthreadMutexLocker locker(&g_dl_mutex);
+
+ android_namespace_t* result = create_namespace(name, ld_library_path,
+ default_library_path, is_isolated);
+
+ if (result == nullptr) {
+ __bionic_format_dlerror("android_create_namespace failed", linker_get_error_buffer());
+ }
+
+ return result;
+}
+
// name_offset: starting index of the name in libdl_info.strtab
#define ELF32_SYM_INITIALIZER(name_offset, value, shndx) \
{ name_offset, \
// 00000000001 1111111112222222222 3333333333444444444455555555556666666666777 777777788888888889999999999
// 01234567890 1234567890123456789 0123456789012345678901234567890123456789012 345678901234567890123456789
"erate_phdr\0android_dlopen_ext\0android_set_application_target_sdk_version\0android_get_application_tar"
- // 0000000000111111
- // 0123456789012345
- "get_sdk_version\0"
+ // 0000000000111111 111122222222223333333333444444 4444555555555566666666667
+ // 0123456789012345 678901234567890123456789012345 6789012345678901234567890
+ "get_sdk_version\0android_init_public_namespace\0android_create_namespace\0"
#if defined(__arm__)
- // 216
+ // 271
"dl_unwind_find_exidx\0"
#endif
;
ELFW(SYM_INITIALIZER)(111, &android_dlopen_ext, 1),
ELFW(SYM_INITIALIZER)(130, &android_set_application_target_sdk_version, 1),
ELFW(SYM_INITIALIZER)(173, &android_get_application_target_sdk_version, 1),
+ ELFW(SYM_INITIALIZER)(216, &android_init_public_namespace, 1),
+ ELFW(SYM_INITIALIZER)(246, &android_create_namespace, 1),
#if defined(__arm__)
- ELFW(SYM_INITIALIZER)(216, &dl_unwind_find_exidx, 1),
+ ELFW(SYM_INITIALIZER)(271, &dl_unwind_find_exidx, 1),
#endif
};
// Note that adding any new symbols here requires stubbing them out in libdl.
static unsigned g_libdl_buckets[1] = { 1 };
#if defined(__arm__)
-static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 0 };
+static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0 };
#else
-static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0 };
+static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 0 };
#endif
static uint8_t __libdl_info_buf[sizeof(soinfo)] __attribute__((aligned(8)));
static soinfo* __libdl_info = nullptr;
+extern android_namespace_t g_default_namespace;
+
// This is used by the dynamic linker. Every process gets these symbols for free.
soinfo* get_libdl_info() {
if (__libdl_info == nullptr) {
- __libdl_info = new (__libdl_info_buf) soinfo("libdl.so", nullptr, 0, RTLD_GLOBAL);
+ __libdl_info = new (__libdl_info_buf) soinfo(&g_default_namespace, "libdl.so", nullptr, 0, RTLD_GLOBAL);
__libdl_info->flags_ |= FLAG_LINKED;
__libdl_info->strtab_ = ANDROID_LIBDL_STRTAB;
__libdl_info->symtab_ = g_libdl_symtab;
T* element;
};
+// ForwardInputIterator
+template<typename T>
+class LinkedListIterator {
+ public:
+ LinkedListIterator() : entry_(nullptr) {}
+ LinkedListIterator(const LinkedListIterator<T>& that) : entry_(that.entry_) {}
+ explicit LinkedListIterator(LinkedListEntry<T>* entry) : entry_(entry) {}
+
+ LinkedListIterator<T>& operator=(const LinkedListIterator<T>& that) {
+ entry_ = that.entry_;
+ return *this;
+ }
+
+ LinkedListIterator<T>& operator++() {
+ entry_ = entry_->next;
+ return *this;
+ }
+
+ T* operator*() {
+ return entry_->element;
+ }
+
+ bool operator==(const LinkedListIterator<T>& that) const {
+ return entry_ == that.entry_;
+ }
+
+ bool operator!=(const LinkedListIterator<T>& that) const {
+ return entry_ != that.entry_;
+ }
+
+ private:
+ LinkedListEntry<T> *entry_;
+};
+
/*
* Represents linked list of objects of type T
*/
template<typename T, typename Allocator>
class LinkedList {
public:
+ typedef LinkedListIterator<T> iterator;
+ typedef T* value_type;
+
LinkedList() : head_(nullptr), tail_(nullptr) {}
~LinkedList() {
clear();
}
Allocator::free(e);
+
e = next;
} else {
p = e;
return nullptr;
}
+ iterator begin() {
+ return iterator(head_);
+ }
+
+ iterator end() {
+ return iterator(nullptr);
+ }
+
+ iterator find(T* value) {
+ for (LinkedListEntry<T>* e = head_; e != nullptr; e = e->next) {
+ if (e->element == value) {
+ return iterator(e);
+ }
+ }
+
+ return end();
+ }
+
size_t copy_to_array(T* array[], size_t array_length) const {
size_t sz = 0;
for (LinkedListEntry<T>* e = head_; sz < array_length && e != nullptr; e = e->next) {
#undef ELF_ST_TYPE
#define ELF_ST_TYPE(x) (static_cast<uint32_t>(x) & 0xf)
+struct android_namespace_t {
+ public:
+ android_namespace_t() : name_(nullptr), is_isolated_(false) {}
+
+ const char* get_name() const { return name_; }
+ void set_name(const char* name) { name_ = name; }
+
+ bool is_isolated() const { return is_isolated_; }
+ void set_isolated(bool isolated) { is_isolated_ = isolated; }
+
+ const std::vector<std::string>& get_ld_library_paths() const {
+ return ld_library_paths_;
+ }
+ void set_ld_library_paths(std::vector<std::string>&& library_paths) {
+ ld_library_paths_ = library_paths;
+ }
+
+ const std::vector<std::string>& get_default_library_paths() const {
+ return default_library_paths_;
+ }
+ void set_default_library_paths(std::vector<std::string>&& library_paths) {
+ default_library_paths_ = library_paths;
+ }
+
+ soinfo::soinfo_list_t& soinfo_list() { return soinfo_list_; }
+
+ // For isolated namespaces - checks if the file is on the search path;
+ // always returns true for not isolated namespace.
+ bool is_accessible(const std::string& path);
+
+ private:
+ const char* name_;
+ bool is_isolated_;
+ std::vector<std::string> ld_library_paths_;
+ std::vector<std::string> default_library_paths_;
+ soinfo::soinfo_list_t soinfo_list_;
+
+ DISALLOW_COPY_AND_ASSIGN(android_namespace_t);
+};
+
+android_namespace_t g_default_namespace;
+
static ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf);
static LinkerTypeAllocator<soinfo> g_soinfo_allocator;
static LinkerTypeAllocator<LinkedListEntry<soinfo>> g_soinfo_links_allocator;
+static LinkerTypeAllocator<android_namespace_t> g_namespace_allocator;
+
static soinfo* solist;
static soinfo* sonext;
static soinfo* somain; // main process, always the one after libdl_info
static const ElfW(Versym) kVersymNotNeeded = 0;
static const ElfW(Versym) kVersymGlobal = 1;
-static const char* const kZipFileSeparator = "!/";
static const char* const* g_default_ld_paths;
-static std::vector<std::string> g_ld_library_paths;
static std::vector<std::string> g_ld_preload_names;
static std::vector<soinfo*> g_ld_preloads;
+static bool g_public_namespace_initialized;
+static soinfo::soinfo_list_t g_public_namespace;
+
__LIBC_HIDDEN__ int g_ld_debug_verbosity;
__LIBC_HIDDEN__ abort_msg_t* g_abort_message = nullptr; // For debuggerd.
rtld_db_dlactivity();
}
+bool android_namespace_t::is_accessible(const std::string& file) {
+ if (!is_isolated_) {
+ return true;
+ }
+
+ for (const auto& dir : ld_library_paths_) {
+ if (file_is_in_dir(file, dir)) {
+ return true;
+ }
+ }
+
+ for (const auto& dir : default_library_paths_) {
+ if (file_is_in_dir(file, dir)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
LinkedListEntry<soinfo>* SoinfoListAllocator::alloc() {
return g_soinfo_links_allocator.alloc();
}
g_soinfo_links_allocator.free(entry);
}
-static soinfo* soinfo_alloc(const char* name, struct stat* file_stat,
- off64_t file_offset, uint32_t rtld_flags) {
+static soinfo* soinfo_alloc(android_namespace_t* ns, const char* name,
+ struct stat* file_stat, off64_t file_offset,
+ uint32_t rtld_flags) {
if (strlen(name) >= PATH_MAX) {
DL_ERR("library name \"%s\" too long", name);
return nullptr;
}
- soinfo* si = new (g_soinfo_allocator.alloc()) soinfo(name, file_stat, file_offset, rtld_flags);
+ soinfo* si = new (g_soinfo_allocator.alloc()) soinfo(ns, name, file_stat,
+ file_offset, rtld_flags);
sonext->next = si;
sonext = si;
+ ns->soinfo_list().push_back(si);
+
TRACE("name %s: allocated soinfo @ %p", name, si);
return si;
}
sonext = prev;
}
+ // remove from the namespace
+ si->get_namespace()->soinfo_list().remove_if([&](soinfo* candidate) {
+ return si == candidate;
+ });
+
si->~soinfo();
g_soinfo_allocator.free(si);
}
-static void parse_path(const char* path, const char* delimiters,
+// For every path element this function checks of it exists, and is a directory,
+// and normalizes it:
+// 1. For regular path it converts it to realpath()
+// 2. For path in a zip file it uses realpath on the zipfile
+// normalizes entry name by calling normalize_path function.
+static void resolve_paths(std::vector<std::string>& paths,
+ std::vector<std::string>* resolved_paths) {
+ resolved_paths->clear();
+ for (const auto& path : paths) {
+ char resolved_path[PATH_MAX];
+ const char* original_path = path.c_str();
+ if (realpath(original_path, resolved_path) != nullptr) {
+ struct stat s;
+ if (stat(resolved_path, &s) == 0) {
+ if (S_ISDIR(s.st_mode)) {
+ resolved_paths->push_back(resolved_path);
+ } else {
+ DL_WARN("Warning: \"%s\" is not a directory (excluding from path)", resolved_path);
+ continue;
+ }
+ } else {
+ DL_WARN("Warning: cannot stat file \"%s\": %s", resolved_path, strerror(errno));
+ continue;
+ }
+ } else {
+ std::string zip_path;
+ std::string entry_path;
+
+ std::string normalized_path;
+
+ if (!normalize_path(original_path, &normalized_path)) {
+ DL_WARN("Warning: unable to normalize \"%s\"", original_path);
+ continue;
+ }
+
+ if (parse_zip_path(normalized_path.c_str(), &zip_path, &entry_path)) {
+ if (realpath(zip_path.c_str(), resolved_path) == nullptr) {
+ DL_WARN("Warning: unable to resolve \"%s\": %s", zip_path.c_str(), strerror(errno));
+ continue;
+ }
+
+ ZipArchiveHandle handle = nullptr;
+ if (OpenArchive(resolved_path, &handle) != 0) {
+ DL_WARN("Warning: unable to open zip archive: %s", resolved_path);
+ continue;
+ }
+
+ // Check if zip-file has a dir with entry_path name
+ void* cookie = nullptr;
+ std::string prefix_str = entry_path + "/";
+ ZipString prefix(prefix_str.c_str());
+
+ ZipEntry out_data;
+ ZipString out_name;
+
+ int32_t error_code;
+
+ if ((error_code = StartIteration(handle, &cookie, &prefix, nullptr)) != 0) {
+ DL_WARN("Unable to iterate over zip-archive entries \"%s\";"
+ " error code: %d", zip_path.c_str(), error_code);
+ continue;
+ }
+
+ if (Next(cookie, &out_data, &out_name) != 0) {
+ DL_WARN("Unable to find entries starting with \"%s\" in \"%s\"",
+ prefix_str.c_str(), zip_path.c_str());
+ continue;
+ }
+
+ auto zip_guard = make_scope_guard([&]() {
+ if (cookie != nullptr) {
+ EndIteration(cookie);
+ }
+ CloseArchive(handle);
+ });
+
+ resolved_paths->push_back(std::string(resolved_path) + kZipFileSeparator + entry_path);
+ }
+ }
+ }
+}
+
+static void split_path(const char* path, const char* delimiters,
std::vector<std::string>* paths) {
- paths->clear();
if (path != nullptr) {
*paths = android::base::Split(path, delimiters);
}
}
+static void parse_path(const char* path, const char* delimiters,
+ std::vector<std::string>* resolved_paths) {
+ std::vector<std::string> paths;
+ split_path(path, delimiters, &paths);
+ resolve_paths(paths, resolved_paths);
+}
+
static void parse_LD_LIBRARY_PATH(const char* path) {
- parse_path(path, ":", &g_ld_library_paths);
+ std::vector<std::string> ld_libary_paths;
+ parse_path(path, ":", &ld_libary_paths);
+ g_default_namespace.set_ld_library_paths(std::move(ld_libary_paths));
}
void soinfo::set_dt_runpath(const char* path) {
- if (!has_min_version(2)) {
+ if (!has_min_version(3)) {
return;
}
- parse_path(path, ":", &dt_runpath_);
+ std::vector<std::string> runpaths;
+
+ split_path(path, ":", &runpaths);
std::string origin = dirname(get_realpath());
// FIXME: add $LIB and $PLATFORM.
std::pair<std::string, std::string> substs[] = {{"ORIGIN", origin}};
- for (auto&& s : dt_runpath_) {
+ for (auto&& s : runpaths) {
size_t pos = 0;
while (pos < s.size()) {
pos = s.find("$", pos);
++pos;
}
}
+
+ resolve_paths(runpaths, &dt_runpath_);
}
static void parse_LD_PRELOAD(const char* path) {
- // We have historically supported ':' as well as ' ' in LD_PRELOAD.
- parse_path(path, " :", &g_ld_preload_names);
+ g_ld_preload_names.clear();
+ if (path != nullptr) {
+ // We have historically supported ':' as well as ' ' in LD_PRELOAD.
+ g_ld_preload_names = android::base::Split(path, " :");
+ }
}
static bool realpath_fd(int fd, std::string* realpath) {
return true;
}
-soinfo::soinfo(const char* realpath, const struct stat* file_stat,
- off64_t file_offset, int rtld_flags) {
+soinfo::soinfo(android_namespace_t* ns, const char* realpath,
+ const struct stat* file_stat, off64_t file_offset,
+ int rtld_flags) {
memset(this, 0, sizeof(*this));
if (realpath != nullptr) {
}
this->rtld_flags_ = rtld_flags;
+ this->namespace_ = ns;
}
void protect_data(int protection) {
g_soinfo_allocator.protect_all(protection);
g_soinfo_links_allocator.protect_all(protection);
+ g_namespace_allocator.protect_all(protection);
}
static size_t ref_count_;
// libraries and they are loaded in breath-first (correct) order we can just execute
// dlsym(RTLD_DEFAULT, ...); instead of doing two stage lookup.
if (si == somain) {
- return dlsym_linear_lookup(name, found, nullptr, RTLD_DEFAULT);
+ return dlsym_linear_lookup(&g_default_namespace, name, found, nullptr, RTLD_DEFAULT);
}
SymbolName symbol_name(name);
beginning of the global solist. Otherwise the search starts at the
specified soinfo (for RTLD_NEXT).
*/
-const ElfW(Sym)* dlsym_linear_lookup(const char* name,
+const ElfW(Sym)* dlsym_linear_lookup(android_namespace_t* ns,
+ const char* name,
soinfo** found,
soinfo* caller,
void* handle) {
SymbolName symbol_name(name);
- soinfo* start = solist;
+ soinfo::soinfo_list_t& soinfo_list = ns->soinfo_list();
+ soinfo::soinfo_list_t::iterator start = soinfo_list.begin();
if (handle == RTLD_NEXT) {
if (caller == nullptr) {
return nullptr;
} else {
- start = caller->next;
+ soinfo::soinfo_list_t::iterator it = soinfo_list.find(caller);
+ CHECK (it != soinfo_list.end());
+ start = ++it;
}
}
const ElfW(Sym)* s = nullptr;
- for (soinfo* si = start; si != nullptr; si = si->next) {
+ for (soinfo::soinfo_list_t::iterator it = start, end = soinfo_list.end(); it != end; ++it) {
+ soinfo* si = *it;
// Do not skip RTLD_LOCAL libraries in dlsym(RTLD_DEFAULT, ...)
// if the library is opened by application with target api level <= 22
// See http://b/21565766
return true;
}
-static int open_library_on_default_path(const char* name, off64_t* file_offset, std::string* realpath) {
- for (size_t i = 0; g_default_ld_paths[i] != nullptr; ++i) {
- char buf[512];
- if (!format_path(buf, sizeof(buf), g_default_ld_paths[i], name)) {
- continue;
- }
-
- int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC));
- if (fd != -1) {
- *file_offset = 0;
- if (!realpath_fd(fd, realpath)) {
- PRINT("warning: unable to get realpath for the library \"%s\". Will use given path.", buf);
- *realpath = buf;
- }
- return fd;
- }
- }
-
- return -1;
-}
-
static int open_library_on_paths(ZipArchiveCache* zip_archive_cache,
const char* name, off64_t* file_offset,
const std::vector<std::string>& paths,
std::string* realpath) {
- for (const auto& path_str : paths) {
+ for (const auto& path : paths) {
char buf[512];
- const char* const path = path_str.c_str();
- if (!format_path(buf, sizeof(buf), path, name)) {
+ if (!format_path(buf, sizeof(buf), path.c_str(), name)) {
continue;
}
return -1;
}
-static int open_library(ZipArchiveCache* zip_archive_cache,
+static int open_library(android_namespace_t* ns,
+ ZipArchiveCache* zip_archive_cache,
const char* name, soinfo *needed_by,
off64_t* file_offset, std::string* realpath) {
TRACE("[ opening %s ]", name);
// If the name contains a slash, we should attempt to open it directly and not search the paths.
if (strchr(name, '/') != nullptr) {
+ int fd = -1;
+
if (strstr(name, kZipFileSeparator) != nullptr) {
- int fd = open_library_in_zipfile(zip_archive_cache, name, file_offset, realpath);
+ fd = open_library_in_zipfile(zip_archive_cache, name, file_offset, realpath);
+ }
+
+ if (fd == -1) {
+ fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC));
if (fd != -1) {
- return fd;
+ *file_offset = 0;
+ if (!realpath_fd(fd, realpath)) {
+ PRINT("warning: unable to get realpath for the library \"%s\". Will use given path.", name);
+ *realpath = name;
+ }
}
}
- int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC));
- if (fd != -1) {
- *file_offset = 0;
- if (!realpath_fd(fd, realpath)) {
- PRINT("warning: unable to get realpath for the library \"%s\". Will use given path.", name);
- *realpath = name;
- }
+ if (fd != -1 && !ns->is_accessible(*realpath)) {
+ fd = -1;
}
return fd;
}
- // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths.
- int fd = open_library_on_paths(zip_archive_cache, name, file_offset, g_ld_library_paths, realpath);
+ // Otherwise we try LD_LIBRARY_PATH first, and fall back to the default library path
+ int fd = open_library_on_paths(zip_archive_cache, name, file_offset, ns->get_ld_library_paths(), realpath);
if (fd == -1 && needed_by != nullptr) {
fd = open_library_on_paths(zip_archive_cache, name, file_offset, needed_by->get_dt_runpath(), realpath);
+ // Check if the library is accessible
+ if (fd != -1 && !ns->is_accessible(*realpath)) {
+ fd = -1;
+ }
}
if (fd == -1) {
- fd = open_library_on_default_path(name, file_offset, realpath);
+ fd = open_library_on_paths(zip_archive_cache, name, file_offset, ns->get_default_library_paths(), realpath);
}
return fd;
}
}
-static bool load_library(LoadTask* task,
+static bool load_library(android_namespace_t* ns,
+ LoadTask* task,
LoadTaskList* load_tasks,
int rtld_flags,
const std::string& realpath) {
// Check for symlink and other situations where
// file can have different names, unless ANDROID_DLEXT_FORCE_LOAD is set
if (extinfo == nullptr || (extinfo->flags & ANDROID_DLEXT_FORCE_LOAD) == 0) {
- for (soinfo* si = solist; si != nullptr; si = si->next) {
- if (si->get_st_dev() != 0 &&
- si->get_st_ino() != 0 &&
- si->get_st_dev() == file_stat.st_dev &&
- si->get_st_ino() == file_stat.st_ino &&
- si->get_file_offset() == file_offset) {
- TRACE("library \"%s\" is already loaded under different name/path \"%s\" - "
- "will return existing soinfo", name, si->get_realpath());
- task->set_soinfo(si);
- return true;
+ auto predicate = [&](soinfo* si) {
+ return si->get_st_dev() != 0 &&
+ si->get_st_ino() != 0 &&
+ si->get_st_dev() == file_stat.st_dev &&
+ si->get_st_ino() == file_stat.st_ino &&
+ si->get_file_offset() == file_offset;
+ };
+
+ soinfo* si = ns->soinfo_list().find_if(predicate);
+
+ // check public namespace
+ if (si == nullptr) {
+ si = g_public_namespace.find_if(predicate);
+ if (si != nullptr) {
+ ns->soinfo_list().push_back(si);
}
}
+
+ if (si != nullptr) {
+ TRACE("library \"%s\" is already loaded under different name/path \"%s\" - "
+ "will return existing soinfo", name, si->get_realpath());
+ task->set_soinfo(si);
+ return true;
+ }
}
if ((rtld_flags & RTLD_NOLOAD) != 0) {
return false;
}
- soinfo* si = soinfo_alloc(realpath.c_str(), &file_stat, file_offset, rtld_flags);
+ soinfo* si = soinfo_alloc(ns, realpath.c_str(), &file_stat, file_offset, rtld_flags);
if (si == nullptr) {
return false;
}
}
-static bool load_library(LoadTask* task,
+static bool load_library(android_namespace_t* ns,
+ LoadTask* task,
ZipArchiveCache* zip_archive_cache,
LoadTaskList* load_tasks,
int rtld_flags) {
task->set_fd(extinfo->library_fd, false);
task->set_file_offset(file_offset);
- return load_library(task, load_tasks, rtld_flags, realpath);
+ return load_library(ns, task, load_tasks, rtld_flags, realpath);
}
// Open the file.
- int fd = open_library(zip_archive_cache, name, needed_by, &file_offset, &realpath);
+ int fd = open_library(ns, zip_archive_cache, name, needed_by, &file_offset, &realpath);
if (fd == -1) {
DL_ERR("library \"%s\" not found", name);
return false;
task->set_fd(fd, true);
task->set_file_offset(file_offset);
- return load_library(task, load_tasks, rtld_flags, realpath);
+ return load_library(ns, task, load_tasks, rtld_flags, realpath);
}
// Returns true if library was found and false in 2 cases
-// 1. The library was found but loaded under different target_sdk_version
-// (*candidate != nullptr)
+// 1. (for default namespace only) The library was found but loaded under different
+// target_sdk_version (*candidate != nullptr)
// 2. The library was not found by soname (*candidate is nullptr)
-static bool find_loaded_library_by_soname(const char* name, soinfo** candidate) {
+static bool find_loaded_library_by_soname(android_namespace_t* ns,
+ const char* name, soinfo** candidate) {
*candidate = nullptr;
// Ignore filename with path.
uint32_t target_sdk_version = get_application_target_sdk_version();
- for (soinfo* si = solist; si != nullptr; si = si->next) {
+ return !ns->soinfo_list().visit([&](soinfo* si) {
const char* soname = si->get_soname();
if (soname != nullptr && (strcmp(name, soname) == 0)) {
// If the library was opened under different target sdk version
// in any case.
bool is_libdl = si == solist;
if (is_libdl || (si->get_dt_flags_1() & DF_1_GLOBAL) != 0 ||
- !si->is_linked() || si->get_target_sdk_version() == target_sdk_version) {
+ !si->is_linked() || si->get_target_sdk_version() == target_sdk_version ||
+ ns != &g_default_namespace) {
*candidate = si;
- return true;
+ return false;
} else if (*candidate == nullptr) {
- // for the different sdk version - remember the first library.
+ // for the different sdk version in the default namespace
+ // remember the first library.
*candidate = si;
}
}
- }
- return false;
+ return true;
+ });
}
-static bool find_library_internal(LoadTask* task,
+static bool find_library_internal(android_namespace_t* ns,
+ LoadTask* task,
ZipArchiveCache* zip_archive_cache,
LoadTaskList* load_tasks,
int rtld_flags) {
soinfo* candidate;
- if (find_loaded_library_by_soname(task->get_name(), &candidate)) {
+ if (find_loaded_library_by_soname(ns, task->get_name(), &candidate)) {
task->set_soinfo(candidate);
return true;
}
+ if (ns != &g_default_namespace) {
+ // check public namespace
+ candidate = g_public_namespace.find_if([&](soinfo* si) {
+ return strcmp(task->get_name(), si->get_soname()) == 0;
+ });
+
+ if (candidate != nullptr) {
+ ns->soinfo_list().push_back(candidate);
+ task->set_soinfo(candidate);
+ return true;
+ }
+ }
+
// Library might still be loaded, the accurate detection
// of this fact is done by load_library.
TRACE("[ '%s' find_loaded_library_by_soname returned false (*candidate=%s@%p). Trying harder...]",
task->get_name(), candidate == nullptr ? "n/a" : candidate->get_realpath(), candidate);
- if (load_library(task, zip_archive_cache, load_tasks, rtld_flags)) {
+ if (load_library(ns, task, zip_archive_cache, load_tasks, rtld_flags)) {
return true;
} else {
// In case we were unable to load the library but there
//
// This group consists of the main executable, LD_PRELOADs
// and libraries with the DF_1_GLOBAL flag set.
-static soinfo::soinfo_list_t make_global_group() {
+static soinfo::soinfo_list_t make_global_group(android_namespace_t* ns) {
soinfo::soinfo_list_t global_group;
- for (soinfo* si = somain; si != nullptr; si = si->next) {
+ ns->soinfo_list().for_each([&](soinfo* si) {
if ((si->get_dt_flags_1() & DF_1_GLOBAL) != 0) {
global_group.push_back(si);
}
- }
+ });
return global_group;
}
// not their transitive dependencies) as children of the start_with library.
// This is false when find_libraries is called for dlopen(), when newly loaded
// libraries must form a disjoint tree.
-static bool find_libraries(soinfo* start_with,
+static bool find_libraries(android_namespace_t* ns,
+ soinfo* start_with,
const char* const library_names[],
size_t library_names_count, soinfo* soinfos[],
std::vector<soinfo*>* ld_preloads,
}
// Construct global_group.
- soinfo::soinfo_list_t global_group = make_global_group();
+ soinfo::soinfo_list_t global_group = make_global_group(ns);
// If soinfos array is null allocate one on stack.
// The array is needed in case of failure; for example
bool is_dt_needed = needed_by != nullptr && (needed_by != start_with || add_as_children);
task->set_extinfo(is_dt_needed ? nullptr : extinfo);
- if(!find_library_internal(task, &zip_archive_cache, &load_tasks, rtld_flags)) {
+ if(!find_library_internal(ns, task, &zip_archive_cache, &load_tasks, rtld_flags)) {
return false;
}
return linked;
}
-static soinfo* find_library(const char* name, int rtld_flags,
+static soinfo* find_library(android_namespace_t* ns,
+ const char* name, int rtld_flags,
const android_dlextinfo* extinfo,
soinfo* needed_by) {
soinfo* si;
if (name == nullptr) {
si = somain;
- } else if (!find_libraries(needed_by, &name, 1, &si, nullptr, 0, rtld_flags,
+ } else if (!find_libraries(ns, needed_by, &name, 1, &si, nullptr, 0, rtld_flags,
extinfo, /* add_as_children */ false)) {
return nullptr;
}
TRACE("deprecated (old format of soinfo): %s needs to unload %s",
si->get_realpath(), library_name);
- soinfo* needed = find_library(library_name, RTLD_NOLOAD, nullptr, nullptr);
+ soinfo* needed = find_library(si->get_namespace(),
+ library_name, RTLD_NOLOAD, nullptr, nullptr);
+
if (needed != nullptr) {
// Not found: for example if symlink was deleted between dlopen and dlclose
// Since we cannot really handle errors at this point - print and continue.
DL_ERR("invalid flags to dlopen: %x", flags);
return nullptr;
}
+
+ android_namespace_t* ns = caller->get_namespace();
+
if (extinfo != nullptr) {
if ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0) {
DL_ERR("invalid extended flags to android_dlopen_ext: 0x%" PRIx64, extinfo->flags);
"compatible with ANDROID_DLEXT_RESERVED_ADDRESS/ANDROID_DLEXT_RESERVED_ADDRESS_HINT");
return nullptr;
}
+
+ if ((extinfo->flags & ANDROID_DLEXT_USE_NAMESPACE) != 0) {
+ if (extinfo->library_namespace == nullptr) {
+ DL_ERR("ANDROID_DLEXT_USE_NAMESPACE is set but extinfo->library_namespace is null");
+ return nullptr;
+ }
+ ns = extinfo->library_namespace;
+ }
}
ProtectedDataGuard guard;
- soinfo* si = find_library(name, flags, extinfo, caller);
+ soinfo* si = find_library(ns, name, flags, extinfo, caller);
if (si != nullptr) {
si->call_constructors();
}
+
return si;
}
soinfo_unload(si);
}
+bool init_public_namespace(const char* libs) {
+ CHECK(libs != nullptr);
+ if (g_public_namespace_initialized) {
+ DL_ERR("Public namespace has already been initialized.");
+ return false;
+ }
+
+ std::vector<std::string> sonames = android::base::Split(libs, ":");
+
+ ProtectedDataGuard guard;
+
+ auto failure_guard = make_scope_guard([&]() {
+ g_public_namespace.clear();
+ });
+
+ soinfo* candidate;
+ for (const auto& soname : sonames) {
+ if (!find_loaded_library_by_soname(&g_default_namespace, soname.c_str(), &candidate)) {
+ DL_ERR("Error initializing public namespace: \"%s\" was not found"
+ " in the default namespace", soname.c_str());
+ return false;
+ }
+
+ candidate->set_nodelete();
+ g_public_namespace.push_back(candidate);
+ }
+
+ failure_guard.disable();
+ g_public_namespace_initialized = true;
+ return true;
+}
+
+android_namespace_t* create_namespace(const char* name,
+ const char* ld_library_path,
+ const char* default_library_path,
+ bool is_isolated) {
+ if (!g_public_namespace_initialized) {
+ DL_ERR("Cannot create namespace: public namespace is not initialized.");
+ return nullptr;
+ }
+
+ ProtectedDataGuard guard;
+ std::vector<std::string> ld_library_paths;
+ std::vector<std::string> default_library_paths;
+
+ parse_path(ld_library_path, ":", &ld_library_paths);
+ parse_path(default_library_path, ":", &default_library_paths);
+
+ android_namespace_t* ns = new (g_namespace_allocator.alloc()) android_namespace_t();
+ ns->set_name(name);
+ ns->set_isolated(is_isolated);
+ ns->set_ld_library_paths(std::move(ld_library_paths));
+ ns->set_default_library_paths(std::move(default_library_paths));
+
+ // TODO(dimtiry): Should this be global group of caller's namespace?
+ auto global_group = make_global_group(&g_default_namespace);
+ std::copy(global_group.begin(), global_group.end(), std::back_inserter(ns->soinfo_list()));
+
+ return ns;
+}
+
static ElfW(Addr) call_ifunc_resolver(ElfW(Addr) resolver_addr) {
typedef ElfW(Addr) (*ifunc_resolver_t)(void);
ifunc_resolver_t ifunc_resolver = reinterpret_cast<ifunc_resolver_t>(resolver_addr);
}
}
+void soinfo::set_nodelete() {
+ rtld_flags_ |= RTLD_NODELETE;
+}
+
const char* soinfo::get_realpath() const {
#if defined(__work_around_b_24465209__)
if (has_min_version(2)) {
static std::vector<std::string> g_empty_runpath;
const std::vector<std::string>& soinfo::get_dt_runpath() const {
- if (has_min_version(2)) {
+ if (has_min_version(3)) {
return dt_runpath_;
}
return g_empty_runpath;
}
+android_namespace_t* soinfo::get_namespace() {
+ if (has_min_version(3)) {
+ return namespace_;
+ }
+
+ return &g_default_namespace;
+}
+
ElfW(Addr) soinfo::resolve_symbol_address(const ElfW(Sym)* s) const {
if (ELF_ST_TYPE(s->st_info) == STT_GNU_IFUNC) {
return call_ifunc_resolver(s->st_value + load_bias);
* be on the soinfo list.
*/
static void init_linker_info_for_gdb(ElfW(Addr) linker_base) {
- linker_soinfo_for_gdb = new (linker_soinfo_for_gdb_buf) soinfo(LINKER_PATH, nullptr, 0, 0);
+ linker_soinfo_for_gdb = new (linker_soinfo_for_gdb_buf) soinfo(nullptr, LINKER_PATH,
+ nullptr, 0, 0);
linker_soinfo_for_gdb->load_bias = linker_base;
insert_soinfo_into_debug_map(linker_soinfo_for_gdb);
}
-static void init_default_ld_library_path() {
+static void init_default_namespace() {
+ g_default_namespace.set_name("(default)");
+ g_default_namespace.set_isolated(false);
+
const char *interp = phdr_table_get_interpreter_name(somain->phdr, somain->phnum,
somain->load_bias);
const char* bname = basename(interp);
- if (bname && (strcmp(bname, "linker_asan") == 0 || strcmp(bname, "linker_asan64") == 0))
+ if (bname && (strcmp(bname, "linker_asan") == 0 || strcmp(bname, "linker_asan64") == 0)) {
g_default_ld_paths = kAsanDefaultLdPaths;
- else
+ } else {
g_default_ld_paths = kDefaultLdPaths;
+ }
+
+ std::vector<std::string> ld_default_paths;
+ for (size_t i = 0; g_default_ld_paths[i] != nullptr; ++i) {
+ ld_default_paths.push_back(g_default_ld_paths[i]);
+ }
+
+ g_default_namespace.set_default_library_paths(std::move(ld_default_paths));
};
extern "C" int __system_properties_init(void);
INFO("[ android linker & debugger ]");
- soinfo* si = soinfo_alloc(args.argv[0], nullptr, 0, RTLD_GLOBAL);
+ soinfo* si = soinfo_alloc(&g_default_namespace, args.argv[0], nullptr, 0, RTLD_GLOBAL);
if (si == nullptr) {
exit(EXIT_FAILURE);
}
somain = si;
- init_default_ld_library_path();
+ init_default_namespace();
if (!si->prelink_image()) {
- __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer());
- exit(EXIT_FAILURE);
+ __libc_fatal("CANNOT LINK EXECUTABLE: %s", linker_get_error_buffer());
}
// add somain to global group
needed_library_name_list.copy_to_array(needed_library_names, needed_libraries_count);
if (needed_libraries_count > 0 &&
- !find_libraries(si, needed_library_names, needed_libraries_count, nullptr,
- &g_ld_preloads, ld_preloads_count, RTLD_GLOBAL, nullptr,
+ !find_libraries(&g_default_namespace, si, needed_library_names, needed_libraries_count,
+ nullptr, &g_ld_preloads, ld_preloads_count, RTLD_GLOBAL, nullptr,
/* add_as_children */ true)) {
- __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer());
- exit(EXIT_FAILURE);
+ __libc_fatal("CANNOT LINK EXECUTABLE: %s", linker_get_error_buffer());
} else if (needed_libraries_count == 0) {
if (!si->link_image(g_empty_list, soinfo::soinfo_list_t::make_list(si), nullptr)) {
- __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer());
- exit(EXIT_FAILURE);
+ __libc_fatal("CANNOT LINK EXECUTABLE: %s", linker_get_error_buffer());
}
si->increment_ref_count();
}
ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr);
ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff);
- soinfo linker_so(nullptr, nullptr, 0, 0);
+ soinfo linker_so(nullptr, nullptr, nullptr, 0, 0);
// If the linker is not acting as PT_INTERP entry_point is equal to
// _start. Which means that the linker is running as an executable and
// This happens when user tries to run 'adb shell /system/bin/linker'
// see also https://code.google.com/p/android/issues/detail?id=63174
if (reinterpret_cast<ElfW(Addr)>(&_start) == entry_point) {
- __libc_fatal("This is %s, the helper program for shared library executables.\n", args.argv[0]);
+ __libc_fatal("This is %s, the helper program for shared library executables.", args.argv[0]);
}
linker_so.base = linker_addr;
// are not yet initialized, and therefore we cannot use linked_list.push_*
// functions at this point.
if (!(linker_so.prelink_image() && linker_so.link_image(g_empty_list, g_empty_list, nullptr))) {
- // It would be nice to print an error message, but if the linker
- // can't link itself, there's no guarantee that we'll be able to
- // call write() (because it involves a GOT reference). We may as
- // well try though...
- const char* msg = "CANNOT LINK EXECUTABLE: ";
- write(2, msg, strlen(msg));
- write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf));
- write(2, "\n", 1);
- _exit(EXIT_FAILURE);
+ __libc_fatal("CANNOT LINK EXECUTABLE: %s", linker_get_error_buffer());
}
__libc_init_main_thread(args);
// before get_libdl_info().
solist = get_libdl_info();
sonext = get_libdl_info();
+ g_default_namespace.soinfo_list().push_back(get_libdl_info());
// We have successfully fixed our own relocations. It's safe to run
// the main part of the linker now.
#define SUPPORTED_DT_FLAGS_1 (DF_1_NOW | DF_1_GLOBAL | DF_1_NODELETE)
-#define SOINFO_VERSION 2
+#define SOINFO_VERSION 3
#if defined(__work_around_b_24465209__)
#define SOINFO_NAME_LEN 128
bool has_DT_SYMBOLIC;
public:
- soinfo(const char* name, const struct stat* file_stat, off64_t file_offset, int rtld_flags);
+ soinfo(android_namespace_t* ns, const char* name, const struct stat* file_stat,
+ off64_t file_offset, int rtld_flags);
void call_constructors();
void call_destructors();
void set_linked();
void set_linker_flag();
void set_main_executable();
+ void set_nodelete();
void increment_ref_count();
size_t decrement_ref_count();
void set_dt_runpath(const char *);
const std::vector<std::string>& get_dt_runpath() const;
+ android_namespace_t* get_namespace();
private:
bool elf_lookup(SymbolName& symbol_name, const version_info* vi, uint32_t* symbol_index) const;
uint32_t target_sdk_version_;
+ // version >= 3
std::vector<std::string> dt_runpath_;
+ android_namespace_t* namespace_;
friend soinfo* get_libdl_info();
};
int do_dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data);
-const ElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* caller, void* handle);
+const ElfW(Sym)* dlsym_linear_lookup(android_namespace_t* ns, const char* name, soinfo** found,
+ soinfo* caller, void* handle);
+
soinfo* find_containing_library(const void* addr);
const ElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* name);
void set_application_target_sdk_version(uint32_t target);
uint32_t get_application_target_sdk_version();
+bool init_public_namespace(const char* path);
+android_namespace_t* create_namespace(const char* name, const char* ld_library_path,
+ const char* default_library_path, bool is_isolated);
+
#endif
bool normalize_path(const char* path, std::string* normalized_path) {
// Input should be an absolute path
if (path[0] != '/') {
- PRINT("canonize_path - invalid input: '%s', the input path should be absolute", path);
+ PRINT("normalize_path - invalid input: '%s', the input path should be absolute", path);
return false;
}
return true;
}
+bool file_is_in_dir(const std::string& file, const std::string& dir) {
+ const char* needle = dir.c_str();
+ const char* haystack = file.c_str();
+ size_t needle_len = strlen(needle);
+
+ return (strncmp(haystack, needle, needle_len) == 0 &&
+ haystack[needle_len] == '/' &&
+ strchr(haystack + needle_len + 1, '/') == nullptr);
+}
+
+const char* const kZipFileSeparator = "!/";
+
+bool parse_zip_path(const char* input_path, std::string* zip_path, std::string* entry_path) {
+ std::string normalized_path;
+ if (!normalize_path(input_path, &normalized_path)) {
+ return false;
+ }
+
+ const char* const path = normalized_path.c_str();
+ TRACE("Trying zip file open from path '%s' -> normalized '%s'", input_path, path);
+
+ // Treat an '!/' separator inside a path as the separator between the name
+ // of the zip file on disk and the subdirectory to search within it.
+ // For example, if path is "foo.zip!/bar/bas/x.so", then we search for
+ // "bar/bas/x.so" within "foo.zip".
+ const char* const separator = strstr(path, kZipFileSeparator);
+ if (separator == nullptr) {
+ return false;
+ }
+
+ char buf[512];
+ if (strlcpy(buf, path, sizeof(buf)) >= sizeof(buf)) {
+ PRINT("Warning: ignoring very long library path: %s", path);
+ return false;
+ }
+
+ buf[separator - path] = '\0';
+
+ *zip_path = buf;
+ *entry_path = &buf[separator - path + 2];
+
+ return true;
+}
+
#include <string>
+extern const char* const kZipFileSeparator;
+
bool normalize_path(const char* path, std::string* normalized_path);
+bool file_is_in_dir(const std::string& file, const std::string& dir);
+bool parse_zip_path(const char* input_path, std::string* zip_path, std::string* entry_path);
#endif
ASSERT_FALSE(normalize_path("root///dir/.///dir2/somedir/../zipfile!/dir/dir9//..///afile", &output));
ASSERT_EQ("unchanged", output);
}
+
+TEST(linker_utils, file_is_in_dir_smoke) {
+ ASSERT_TRUE(file_is_in_dir("/foo/bar/file", "/foo/bar"));
+ ASSERT_FALSE(file_is_in_dir("/foo/bar/file", "/foo"));
+
+ ASSERT_FALSE(file_is_in_dir("/foo/bar/file", "/bar/foo"));
+
+ ASSERT_TRUE(file_is_in_dir("/file", ""));
+ ASSERT_FALSE(file_is_in_dir("/file", "/"));
+}
+
+TEST(linker_utils, parse_zip_path_smoke) {
+ std::string zip_path;
+ std::string entry_path;
+
+ ASSERT_FALSE(parse_zip_path("/not/a/zip/path/file.zip", &zip_path, &entry_path));
+ ASSERT_FALSE(parse_zip_path("/not/a/zip/path/file.zip!path/in/zip", &zip_path, &entry_path));
+ ASSERT_TRUE(parse_zip_path("/zip/path/file.zip!/path/in/zip", &zip_path, &entry_path));
+ ASSERT_EQ("/zip/path/file.zip", zip_path);
+ ASSERT_EQ("path/in/zip", entry_path);
+
+ ASSERT_TRUE(parse_zip_path("/zip/path/file2.zip!/", &zip_path, &entry_path));
+ ASSERT_EQ("/zip/path/file2.zip", zip_path);
+ ASSERT_EQ("", entry_path);
+}
+
LOCAL_MODULE_STEM_32 := $(module)32
LOCAL_MODULE_STEM_64 := $(module)64
else
+
+ifneq ($($(module)_install_to_out_data_dir),)
+ $(module)_install_to_out_data := true
+endif
+
ifeq ($($(module)_install_to_out_data),true)
- LOCAL_MODULE_PATH_32 := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_NATIVE_TESTS)/$(module)
- LOCAL_MODULE_PATH_64 := $(TARGET_OUT_DATA_NATIVE_TESTS)/$(module)
+ ifeq ($($(module)_install_to_out_data_dir),)
+ $(module)_install_to_out_data_dir := $(module)
+ endif
+ LOCAL_MODULE_PATH_32 := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_NATIVE_TESTS)/$($(module)_install_to_out_data_dir)
+ LOCAL_MODULE_PATH_64 := $(TARGET_OUT_DATA_NATIVE_TESTS)/$($(module)_install_to_out_data_dir)
endif
endif
#define LIBSIZE 1024*1024 // how much address space to reserve for it
#if defined(__LP64__)
-#define LIBPATH_PREFIX "/nativetest64/"
+#define NATIVE_TESTS_PATH "/nativetest64"
#else
-#define LIBPATH_PREFIX "/nativetest/"
+#define NATIVE_TESTS_PATH "/nativetest"
#endif
-#define LIBPATH LIBPATH_PREFIX "libdlext_test_fd/libdlext_test_fd.so"
-#define LIBZIPPATH LIBPATH_PREFIX "libdlext_test_zip/libdlext_test_zip_zipaligned.zip"
-#define LIBZIPPATH_WITH_RUNPATH LIBPATH_PREFIX "libdlext_test_runpath_zip/libdlext_test_runpath_zip_zipaligned.zip"
+#define LIBPATH NATIVE_TESTS_PATH "/libdlext_test_fd/libdlext_test_fd.so"
+#define LIBZIPPATH NATIVE_TESTS_PATH "/libdlext_test_zip/libdlext_test_zip_zipaligned.zip"
+#define LIBZIPPATH_WITH_RUNPATH NATIVE_TESTS_PATH "/libdlext_test_runpath_zip/libdlext_test_runpath_zip_zipaligned.zip"
#define LIBZIP_OFFSET PAGE_SIZE
ASSERT_EQ(0, WEXITSTATUS(status));
}
}
+
+// Testing namespaces
+static const char* g_public_lib = "libnstest_public.so";
+
+TEST(dlext, ns_smoke) {
+ static const char* root_lib = "libnstest_root.so";
+ std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
+
+ ASSERT_FALSE(android_init_public_namespace(path.c_str()));
+ ASSERT_STREQ("android_init_public_namespace failed: Error initializing public namespace: "
+ "\"libnstest_public.so\" was not found in the default namespace", dlerror());
+
+ const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
+
+ void* handle_public = dlopen((lib_path + "/public_namespace_libs/" + g_public_lib).c_str(), RTLD_NOW);
+ ASSERT_TRUE(handle_public != nullptr) << dlerror();
+
+ ASSERT_TRUE(android_init_public_namespace(path.c_str())) << dlerror();
+
+ // Check that libraries added to public namespace are NODELETE
+ dlclose(handle_public);
+ handle_public = dlopen((lib_path + "/public_namespace_libs/" + g_public_lib).c_str(), RTLD_NOW | RTLD_NOLOAD);
+ ASSERT_TRUE(handle_public != nullptr) << dlerror();
+
+ android_namespace_t* ns1 = android_create_namespace("private", nullptr, (lib_path + "/private_namespace_libs").c_str(), false);
+ ASSERT_TRUE(ns1 != nullptr) << dlerror();
+
+ android_namespace_t* ns2 = android_create_namespace("private_isolated", nullptr, (lib_path + "/private_namespace_libs").c_str(), true);
+ ASSERT_TRUE(ns2 != nullptr) << dlerror();
+
+ // This should not have affect search path for default namespace:
+ ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
+ void* handle = dlopen(g_public_lib, RTLD_NOW);
+ ASSERT_TRUE(handle != nullptr) << dlerror();
+ dlclose(handle);
+
+ android_dlextinfo extinfo;
+ extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
+ extinfo.library_namespace = ns1;
+
+ void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle1 != nullptr) << dlerror();
+
+ extinfo.library_namespace = ns2;
+ void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle2 != nullptr) << dlerror();
+
+ ASSERT_TRUE(handle1 != handle2);
+
+ typedef const char* (*fn_t)();
+
+ fn_t ns_get_local_string1 = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
+ ASSERT_TRUE(ns_get_local_string1 != nullptr) << dlerror();
+ fn_t ns_get_local_string2 = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_local_string"));
+ ASSERT_TRUE(ns_get_local_string2 != nullptr) << dlerror();
+
+ EXPECT_STREQ("This string is local to root library", ns_get_local_string1());
+ EXPECT_STREQ("This string is local to root library", ns_get_local_string2());
+
+ ASSERT_TRUE(ns_get_local_string1() != ns_get_local_string2());
+
+ fn_t ns_get_private_extern_string1 =
+ reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
+ ASSERT_TRUE(ns_get_private_extern_string1 != nullptr) << dlerror();
+ fn_t ns_get_private_extern_string2 =
+ reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_private_extern_string"));
+ ASSERT_TRUE(ns_get_private_extern_string2 != nullptr) << dlerror();
+
+ EXPECT_STREQ("This string is from private namespace", ns_get_private_extern_string1());
+ EXPECT_STREQ("This string is from private namespace", ns_get_private_extern_string2());
+
+ ASSERT_TRUE(ns_get_private_extern_string1() != ns_get_private_extern_string2());
+
+ fn_t ns_get_public_extern_string1 =
+ reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
+ ASSERT_TRUE(ns_get_public_extern_string1 != nullptr) << dlerror();
+ fn_t ns_get_public_extern_string2 =
+ reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_public_extern_string"));
+ ASSERT_TRUE(ns_get_public_extern_string2 != nullptr) << dlerror();
+
+ EXPECT_STREQ("This string is from public namespace", ns_get_public_extern_string1());
+ ASSERT_TRUE(ns_get_public_extern_string1() == ns_get_public_extern_string2());
+
+ // and now check that dlopen() does the right thing in terms of preserving namespace
+ fn_t ns_get_dlopened_string1 = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
+ ASSERT_TRUE(ns_get_dlopened_string1 != nullptr) << dlerror();
+ fn_t ns_get_dlopened_string2 = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_dlopened_string"));
+ ASSERT_TRUE(ns_get_dlopened_string2 != nullptr) << dlerror();
+
+ EXPECT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string1());
+ EXPECT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string2());
+
+ ASSERT_TRUE(ns_get_dlopened_string1() != ns_get_dlopened_string2());
+
+ dlclose(handle1);
+
+ // Check if handle2 is still alive (and well)
+ ASSERT_STREQ("This string is local to root library", ns_get_local_string2());
+ ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string2());
+ ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string2());
+ ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string2());
+
+ dlclose(handle2);
+}
+
+TEST(dlext, ns_isolated) {
+ static const char* root_lib = "libnstest_root_not_isolated.so";
+ std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
+
+ const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
+ void* handle_public = dlopen((lib_path + "/public_namespace_libs/" + g_public_lib).c_str(), RTLD_NOW);
+ ASSERT_TRUE(handle_public != nullptr) << dlerror();
+
+ ASSERT_TRUE(android_init_public_namespace(path.c_str())) << dlerror();
+
+ android_namespace_t* ns_not_isolated = android_create_namespace("private", nullptr, (lib_path + "/private_namespace_libs").c_str(), false);
+ ASSERT_TRUE(ns_not_isolated != nullptr) << dlerror();
+
+ android_namespace_t* ns_isolated = android_create_namespace("private_isolated1", nullptr, (lib_path + "/private_namespace_libs").c_str(), true);
+ ASSERT_TRUE(ns_isolated != nullptr) << dlerror();
+
+ android_namespace_t* ns_isolated2 = android_create_namespace("private_isolated2", (lib_path + "/private_namespace_libs").c_str(), nullptr, true);
+ ASSERT_TRUE(ns_isolated2 != nullptr) << dlerror();
+
+ ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
+ ASSERT_STREQ("dlopen failed: library \"libnstest_root_not_isolated.so\" not found", dlerror());
+
+ std::string lib_private_external_path =
+ lib_path + "/private_namespace_libs_external/libnstest_private_external.so";
+
+ // Load lib_private_external_path to default namespace
+ // (it should remain invisible for the isolated namespaces after this)
+ void* handle = dlopen(lib_private_external_path.c_str(), RTLD_NOW);
+ ASSERT_TRUE(handle != nullptr) << dlerror();
+
+ android_dlextinfo extinfo;
+ extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
+ extinfo.library_namespace = ns_not_isolated;
+
+ void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle1 != nullptr) << dlerror();
+
+ extinfo.library_namespace = ns_isolated;
+
+ void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle2 == nullptr);
+ ASSERT_STREQ("dlopen failed: library \"libnstest_private_external.so\" not found", dlerror());
+
+ // Check dlopen by absolute path
+ handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle2 == nullptr);
+ ASSERT_EQ("dlopen failed: library \"" + lib_private_external_path + "\" not found", dlerror());
+
+ extinfo.library_namespace = ns_isolated2;
+
+ handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle2 == nullptr);
+ ASSERT_STREQ("dlopen failed: library \"libnstest_private_external.so\" not found", dlerror());
+
+ // Check dlopen by absolute path
+ handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
+ ASSERT_TRUE(handle2 == nullptr);
+ ASSERT_EQ("dlopen failed: library \"" + lib_private_external_path + "\" not found", dlerror());
+
+ typedef const char* (*fn_t)();
+ fn_t ns_get_local_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
+ ASSERT_TRUE(ns_get_local_string != nullptr) << dlerror();
+
+ ASSERT_STREQ("This string is local to root library", ns_get_local_string());
+
+ fn_t ns_get_private_extern_string =
+ reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
+ ASSERT_TRUE(ns_get_private_extern_string != nullptr) << dlerror();
+
+ ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string());
+
+ fn_t ns_get_public_extern_string =
+ reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
+ ASSERT_TRUE(ns_get_public_extern_string != nullptr) << dlerror();
+
+ ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string());
+
+ fn_t ns_get_dlopened_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
+ ASSERT_TRUE(ns_get_dlopened_string != nullptr) << dlerror();
+
+ ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string());
+
+ dlclose(handle1);
+}
--- /dev/null
+#
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# -----------------------------------------------------------------------------
+# This set of libraries are used to verify linker namespaces.
+# -----------------------------------------------------------------------------
+
+# -----------------------------------------------------------------------------
+# Test cases
+# 1. Check that private libraries loaded in different namespaces are
+# different. Check that dlsym does not confuse them.
+# 2. Check that public libraries loaded in different namespaces are shared
+# between them.
+# 3. Check that namespace sticks on dlopen
+#
+# Dependency tree (visibility)
+# libnstest_root.so (this should be local to the namespace)
+# +-> libnstest_public.so
+# +-> libnstest_private.so
+#
+# libnstest_dlopened.so (library in private namespace dlopened from libnstest_root.so)
+# -----------------------------------------------------------------------------
+libnstest_root_src_files := namespaces_root.cpp
+libnstest_root_shared_libraries := libnstest_public libnstest_private
+libnstest_root_install_to_out_data_dir := private_namespace_libs
+module := libnstest_root
+include $(LOCAL_PATH)/Android.build.target.testlib.mk
+
+libnstest_public_src_files := namespaces_public.cpp
+module := libnstest_public
+libnstest_public_install_to_out_data_dir := public_namespace_libs
+include $(LOCAL_PATH)/Android.build.target.testlib.mk
+
+libnstest_private_src_files := namespaces_private.cpp
+libnstest_private_install_to_out_data_dir := private_namespace_libs
+module := libnstest_private
+include $(LOCAL_PATH)/Android.build.target.testlib.mk
+
+libnstest_dlopened_src_files := namespaces_dlopened.cpp
+libnstest_dlopened_install_to_out_data_dir := private_namespace_libs
+module := libnstest_dlopened
+include $(LOCAL_PATH)/Android.build.target.testlib.mk
+
+# -----------------------------------------------------------------------------
+# This set of libraries is to test isolated namespaces
+#
+# Isolated namespaces do not allow loading of the library outside of
+# the search paths.
+#
+# This library cannot be loaded in isolated namespace because one of DT_NEEDED
+# libraries is outside of the search paths.
+#
+# libnstest_root_not_isolated.so (DT_RUNPATH = $ORIGIN/../private_namespace_libs_external/)
+# +-> libnstest_public.so
+# +-> libnstest_private_external.so (located in $ORIGIN/../private_namespace_libs_external/)
+#
+# Search path: $NATIVE_TESTS/private_namespace_libs/
+# -----------------------------------------------------------------------------
+libnstest_root_not_isolated_src_files := namespaces_root.cpp
+libnstest_root_not_isolated_shared_libraries := libnstest_public libnstest_private_external
+libnstest_root_not_isolated_install_to_out_data_dir := private_namespace_libs
+libnstest_root_not_isolated_ldflags := -Wl,--rpath,\$$ORIGIN/../private_namespace_libs_external \
+ -Wl,--enable-new-dtags
+
+module := libnstest_root_not_isolated
+include $(LOCAL_PATH)/Android.build.target.testlib.mk
+
+libnstest_private_external_src_files := namespaces_private.cpp
+libnstest_private_external_install_to_out_data_dir := private_namespace_libs_external
+module := libnstest_private_external
+include $(LOCAL_PATH)/Android.build.target.testlib.mk
--- /dev/null
+#
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+build_target := SHARED_LIBRARY
+build_type := target
+include $(TEST_PATH)/Android.build.mk
+
$(LOCAL_PATH)/Android.build.dlopen_check_order_dlsym.mk \
$(LOCAL_PATH)/Android.build.dlopen_check_order_reloc_siblings.mk \
$(LOCAL_PATH)/Android.build.dlopen_check_order_reloc_main_executable.mk \
+ $(LOCAL_PATH)/Android.build.linker_namespaces.mk \
$(LOCAL_PATH)/Android.build.pthread_atfork.mk \
$(LOCAL_PATH)/Android.build.testlib.mk \
$(LOCAL_PATH)/Android.build.versioned_lib.mk \
include $(LOCAL_PATH)/Android.build.testlib.mk
# -----------------------------------------------------------------------------
+# Build test helper libraries for linker namespaces
+# -----------------------------------------------------------------------------
+include $(LOCAL_PATH)/Android.build.linker_namespaces.mk
+
+# -----------------------------------------------------------------------------
# Build DT_RUNPATH test helper libraries
# -----------------------------------------------------------------------------
include $(LOCAL_PATH)/Android.build.dt_runpath.mk
--- /dev/null
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const char* g_private_dlopened_string = "This string is from private namespace "
+ "(dlopened library)";
+
--- /dev/null
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const char* g_private_extern_string = "This string is from private namespace";
+
--- /dev/null
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const char* g_public_extern_string = "This string is from public namespace";
+
--- /dev/null
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <dlfcn.h>
+
+static const char* g_local_string = "This string is local to root library";
+extern "C" const char* g_private_extern_string;
+extern "C" const char* g_public_extern_string;
+
+bool g_dlopened = false;
+
+extern "C" const char* ns_get_local_string() {
+ return g_local_string;
+}
+
+extern "C" const char* ns_get_private_extern_string() {
+ return g_private_extern_string;
+}
+
+extern "C" const char* ns_get_public_extern_string() {
+ return g_public_extern_string;
+}
+
+extern "C" const char* ns_get_dlopened_string() {
+ void* handle = dlopen("libnstest_dlopened.so", RTLD_NOW | RTLD_GLOBAL);
+ if (handle == nullptr) {
+ return nullptr;
+ }
+
+ const char* result = *static_cast<const char**>(dlsym(handle, "g_private_dlopened_string"));
+ if (result != nullptr) {
+ g_dlopened = true;
+ }
+
+ return result;
+}
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