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Commit 13e51e7f authored by Oli Lan's avatar Oli Lan
Browse files

Create DE_sys APEX data directories. 

This creates the directory /data/misc/apexdata, at the same time as other
directories under /data/misc. Then, when apexd has finished activating
APEXes, a directory is created under /data/misc/apexdata for every
APEX, with the same name as the APEX module name.

See go/apex-data-directories.

APEXes are discovered by scanning the /apex directory. It may be better
to delegate this process to a library, but it is proposed to defer that
change to a future CL.

Bug: 141148175
Test: Built and flashed, checked directories were created.
Change-Id: I639d6f490ae0b97f116ce38ff3ac348bd73aa20e
parent 1fd9c556

init/builtins.cpp

+68 −25
Original line number Diff line number Diff line
@@ -360,57 +360,61 @@ static Result<void> do_interface_stop(const BuiltinArguments& args) { 
    return {};

}



// mkdir <path> [mode] [owner] [group] [<option> ...]

static Result<void> do_mkdir(const BuiltinArguments& args) {

    auto options = ParseMkdir(args.args);

    if (!options) return options.error();

static Result<void> make_dir_with_options(const MkdirOptions& options) {

    std::string ref_basename;

    if (options->ref_option == "ref") {

    if (options.ref_option == "ref") {

        ref_basename = fscrypt_key_ref;

    } else if (options->ref_option == "per_boot_ref") {

    } else if (options.ref_option == "per_boot_ref") {

        ref_basename = fscrypt_key_per_boot_ref;

    } else {

        return Error() << "Unknown key option: '" << options->ref_option << "'";

        return Error() << "Unknown key option: '" << options.ref_option << "'";

    }



    struct stat mstat;

    if (lstat(options->target.c_str(), &mstat) != 0) {

    if (lstat(options.target.c_str(), &mstat) != 0) {

        if (errno != ENOENT) {

            return ErrnoError() << "lstat() failed on " << options->target;

            return ErrnoError() << "lstat() failed on " << options.target;

        }

        if (!make_dir(options->target, options->mode)) {

            return ErrnoErrorIgnoreEnoent() << "mkdir() failed on " << options->target;

        if (!make_dir(options.target, options.mode)) {

            return ErrnoErrorIgnoreEnoent() << "mkdir() failed on " << options.target;

        }

        if (lstat(options->target.c_str(), &mstat) != 0) {

            return ErrnoError() << "lstat() failed on new " << options->target;

        if (lstat(options.target.c_str(), &mstat) != 0) {

            return ErrnoError() << "lstat() failed on new " << options.target;

        }

    }

    if (!S_ISDIR(mstat.st_mode)) {

        return Error() << "Not a directory on " << options->target;

        return Error() << "Not a directory on " << options.target;

    }

    bool needs_chmod = (mstat.st_mode & ~S_IFMT) != options->mode;

    if ((options->uid != static_cast<uid_t>(-1) && options->uid != mstat.st_uid) ||

        (options->gid != static_cast<gid_t>(-1) && options->gid != mstat.st_gid)) {

        if (lchown(options->target.c_str(), options->uid, options->gid) == -1) {

            return ErrnoError() << "lchown failed on " << options->target;

    bool needs_chmod = (mstat.st_mode & ~S_IFMT) != options.mode;

    if ((options.uid != static_cast<uid_t>(-1) && options.uid != mstat.st_uid) ||

        (options.gid != static_cast<gid_t>(-1) && options.gid != mstat.st_gid)) {

        if (lchown(options.target.c_str(), options.uid, options.gid) == -1) {

            return ErrnoError() << "lchown failed on " << options.target;

        }

        // chown may have cleared S_ISUID and S_ISGID, chmod again

        needs_chmod = true;

    }

    if (needs_chmod) {

        if (fchmodat(AT_FDCWD, options->target.c_str(), options->mode, AT_SYMLINK_NOFOLLOW) == -1) {

            return ErrnoError() << "fchmodat() failed on " << options->target;

        if (fchmodat(AT_FDCWD, options.target.c_str(), options.mode, AT_SYMLINK_NOFOLLOW) == -1) {

            return ErrnoError() << "fchmodat() failed on " << options.target;

        }

    }

    if (fscrypt_is_native()) {

        if (!FscryptSetDirectoryPolicy(ref_basename, options->fscrypt_action, options->target)) {

        if (!FscryptSetDirectoryPolicy(ref_basename, options.fscrypt_action, options.target)) {

            return reboot_into_recovery(

                    {"--prompt_and_wipe_data", "--reason=set_policy_failed:"s + options->target});

                    {"--prompt_and_wipe_data", "--reason=set_policy_failed:"s + options.target});

        }

    }

    return {};

}



// mkdir <path> [mode] [owner] [group] [<option> ...]

static Result<void> do_mkdir(const BuiltinArguments& args) {

    auto options = ParseMkdir(args.args);

    if (!options) return options.error();

    return make_dir_with_options(*options);

}



/* umount <path> */

static Result<void> do_umount(const BuiltinArguments& args) {

    if (umount(args[1].c_str()) < 0) {
@@ -1172,7 +1176,7 @@ static Result<void> do_mark_post_data(const BuiltinArguments& args) { 
    return {};

}



static Result<void> do_parse_apex_configs(const BuiltinArguments& args) {

static Result<void> parse_apex_configs() {

    glob_t glob_result;

    static constexpr char glob_pattern[] = "/apex/*/etc/*.rc";

    const int ret = glob(glob_pattern, GLOB_MARK, nullptr, &glob_result);
@@ -1211,6 +1215,45 @@ static Result<void> do_parse_apex_configs(const BuiltinArguments& args) { 
    }

}



/*

 * Creates a directory under /data/misc/apexdata/ for each APEX.

 */

static Result<void> create_apex_data_dirs() {

    auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir("/apex"), closedir);

    if (!dirp) {

        return ErrnoError() << "Unable to open apex directory";

    }

    struct dirent* entry;

    while ((entry = readdir(dirp.get())) != nullptr) {

        if (entry->d_type != DT_DIR) continue;



        const char* name = entry->d_name;

        // skip any starting with "."

        if (name[0] == '.') continue;



        if (strchr(name, '@') != nullptr) continue;



        auto path = "/data/misc/apexdata/" + std::string(name);

        auto system_uid = DecodeUid("system");

        auto options =

                MkdirOptions{path, 0700, *system_uid, *system_uid, FscryptAction::kNone, "ref"};

        make_dir_with_options(options);

    }

    return {};

}



static Result<void> do_perform_apex_config(const BuiltinArguments& args) {

    auto create_dirs = create_apex_data_dirs();

    if (!create_dirs) {

        return create_dirs.error();

    }

    auto parse_configs = parse_apex_configs();

    if (!parse_configs) {

        return parse_configs.error();

    }

    return {};

}



static Result<void> do_enter_default_mount_ns(const BuiltinArguments& args) {

    if (SwitchToDefaultMountNamespace()) {

        return {};
@@ -1271,7 +1314,7 @@ const BuiltinFunctionMap& GetBuiltinFunctionMap() { 
        // mount and umount are run in the same context as mount_all for symmetry.

        {"mount_all",               {1,     kMax, {false,  do_mount_all}}},

        {"mount",                   {3,     kMax, {false,  do_mount}}},

        {"parse_apex_configs",      {0,     0,    {false,  do_parse_apex_configs}}},

        {"perform_apex_config",     {0,     0,    {false,  do_perform_apex_config}}},

        {"umount",                  {1,     1,    {false,  do_umount}}},

        {"umount_all",              {1,     1,    {false,  do_umount_all}}},

        {"readahead",               {1,     2,    {true,   do_readahead}}},

rootdir/init.rc

+3 −1
Original line number Diff line number Diff line
@@ -579,6 +579,7 @@ on post-fs-data 
    mkdir /data/misc/profman 0770 system shell

    mkdir /data/misc/gcov 0770 root root

    mkdir /data/misc/installd 0700 root root

    mkdir /data/misc/apexdata 0700 root root



    mkdir /data/preloads 0775 system system encryption=None
@@ -668,7 +669,8 @@ on post-fs-data 


    # Wait for apexd to finish activating APEXes before starting more processes.

    wait_for_prop apexd.status ready

    parse_apex_configs

    perform_apex_config



    exec_start derive_sdk



    init_user0