diff options
Diffstat (limited to 'init/builtins.cpp')
| -rw-r--r-- | init/builtins.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/init/builtins.cpp b/init/builtins.cpp index 52828c00d..4a66e46f1 100644 --- a/init/builtins.cpp +++ b/init/builtins.cpp @@ -1093,6 +1093,86 @@ static Result<Success> do_parse_apex_configs(const BuiltinArguments& args) { } } +static Result<Success> bind_mount_file(const char* source, const char* mount_point, + bool remount_private) { + if (remount_private && mount(nullptr, mount_point, nullptr, MS_PRIVATE, nullptr) == -1) { + return ErrnoError() << "Could not change " << mount_point << " to a private mount point"; + } + if (mount(source, mount_point, nullptr, MS_BIND, nullptr) == -1) { + return ErrnoError() << "Could not bind-mount " << source << " to " << mount_point; + } + return Success(); +} + +static Result<Success> bind_mount_bionic(const char* linker_source, const char* lib_dir_source, + const char* linker_mount_point, const char* lib_mount_dir, + bool remount_private) { + if (access(linker_source, F_OK) != 0) { + return Success(); + } + if (auto result = bind_mount_file(linker_source, linker_mount_point, remount_private); + !result) { + return result; + } + for (auto libname : kBionicLibFileNames) { + std::string mount_point = lib_mount_dir + libname; + std::string source = lib_dir_source + libname; + if (auto result = bind_mount_file(source.c_str(), mount_point.c_str(), remount_private); + !result) { + return result; + } + } + return Success(); +} + +// The bootstrap bionic libs and the bootstrap linker are bind-mounted to +// the mount points for pre-apexd processes. +static Result<Success> do_prepare_bootstrap_bionic(const BuiltinArguments& args) { + static bool prepare_bootstrap_bionic_done = false; + if (prepare_bootstrap_bionic_done) { + return Error() << "prepare_bootstrap_bionic was already executed. Cannot be executed again"; + } + if (auto result = bind_mount_bionic(kBootstrapLinkerPath, kBootstrapBionicLibsDir, + kLinkerMountPoint, kBionicLibsMountPointDir, false); + !result) { + return result; + } + if (auto result = bind_mount_bionic(kBootstrapLinkerPath64, kBootstrapBionicLibsDir64, + kLinkerMountPoint64, kBionicLibsMountPointDir64, false); + !result) { + return result; + } + + LOG(INFO) << "prepare_bootstrap_bionic done"; + prepare_bootstrap_bionic_done = true; + return Success(); +} + +// The bionic libs and the dynamic linker from the runtime APEX are bind-mounted +// to the mount points. As a result, the previous mounts done by +// prepare_bootstrap_bionic become hidden. +static Result<Success> do_setup_runtime_bionic(const BuiltinArguments& args) { + static bool setup_runtime_bionic_done = false; + if (setup_runtime_bionic_done) { + return Error() << "setup_runtime_bionic was already executed. Cannot be executed again"; + } + if (auto result = bind_mount_bionic(kRuntimeLinkerPath, kRuntimeBionicLibsDir, + kLinkerMountPoint, kBionicLibsMountPointDir, true); + !result) { + return result; + } + if (auto result = bind_mount_bionic(kRuntimeLinkerPath64, kRuntimeBionicLibsDir64, + kLinkerMountPoint64, kBionicLibsMountPointDir64, true); + !result) { + return result; + } + + ServiceList::GetInstance().MarkRuntimeAvailable(); + LOG(INFO) << "setup_runtime_bionic done"; + setup_runtime_bionic_done = true; + return Success(); +} + // Builtin-function-map start const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const { constexpr std::size_t kMax = std::numeric_limits<std::size_t>::max(); @@ -1131,6 +1211,7 @@ const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const { {"mount_all", {1, kMax, {false, do_mount_all}}}, {"mount", {3, kMax, {false, do_mount}}}, {"parse_apex_configs", {0, 0, {false, do_parse_apex_configs}}}, + {"prepare_bootstrap_bionic",{0, 0, {false, do_prepare_bootstrap_bionic}}}, {"umount", {1, 1, {false, do_umount}}}, {"readahead", {1, 2, {true, do_readahead}}}, {"restart", {1, 1, {false, do_restart}}}, @@ -1139,6 +1220,7 @@ const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const { {"rm", {1, 1, {true, do_rm}}}, {"rmdir", {1, 1, {true, do_rmdir}}}, {"setprop", {2, 2, {true, do_setprop}}}, + {"setup_runtime_bionic", {0, 0, {false, do_setup_runtime_bionic}}}, {"setrlimit", {3, 3, {false, do_setrlimit}}}, {"start", {1, 1, {false, do_start}}}, {"stop", {1, 1, {false, do_stop}}}, |