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Commit 55c0e5bd authored by Al Viro's avatar Al Viro
Browse files

smack: take the guts of smack_parse_opts_str() into a new helper 



smack_add_opt() adds an already matched option to growing smack_mnt_options

Reviewed-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 757cbe59

security/smack/smack_lsm.c

+57 −57
Original line number Diff line number Diff line
@@ -629,94 +629,94 @@ static int smack_sb_copy_data(char *orig, char *smackopts) 
	return 0;

}



/**

 * smack_parse_opts_str - parse Smack specific mount options

 * @options: mount options string

 * @opts: where to store converted mount opts

 *

 * Returns 0 on success or -ENOMEM on error.

 *

 * converts Smack specific mount options to generic security option format

 */

static int smack_parse_opts_str(char *options,

		void **mnt_opts)

static int smack_add_opt(int token, const char *s, void **mnt_opts)

{

	struct smack_mnt_opts *opts = *mnt_opts;

	char *p;

	int rc = -ENOMEM;

	int token;



	if (!options)

		return 0;



	while ((p = strsep(&options, ",")) != NULL) {

		substring_t args[MAX_OPT_ARGS];



		if (!*p)

			continue;



		token = match_token(p, smk_mount_tokens, args);



	if (!opts) {

		opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);

		if (!opts)

			return -ENOMEM;

		*mnt_opts = opts;

	}



	if (!s)

		return -ENOMEM;



	switch (token) {

	case Opt_fsdefault:

		if (opts->fsdefault)

			goto out_opt_err;

			opts->fsdefault = match_strdup(&args[0]);

			if (!opts->fsdefault)

				goto out_err;

		opts->fsdefault = s;

		break;

	case Opt_fsfloor:

		if (opts->fsfloor)

			goto out_opt_err;

			opts->fsfloor = match_strdup(&args[0]);

			if (!opts->fsfloor)

				goto out_err;

		opts->fsfloor = s;

		break;

	case Opt_fshat:

		if (opts->fshat)

			goto out_opt_err;

			opts->fshat = match_strdup(&args[0]);

			if (!opts->fshat)

				goto out_err;

		opts->fshat = s;

		break;

	case Opt_fsroot:

		if (opts->fsroot)

			goto out_opt_err;

			opts->fsroot = match_strdup(&args[0]);

			if (!opts->fsroot)

				goto out_err;

		opts->fsroot = s;

		break;

	case Opt_fstransmute:

		if (opts->fstransmute)

			goto out_opt_err;

			opts->fstransmute = match_strdup(&args[0]);

			if (!opts->fstransmute)

				goto out_err;

		opts->fstransmute = s;

		break;

		default:

			rc = -EINVAL;

			pr_warn("Smack:  unknown mount option\n");

			goto out_err;

		}

	}

	*mnt_opts = opts;

	return 0;



out_opt_err:

	rc = -EINVAL;

	pr_warn("Smack: duplicate mount options\n");

	return -EINVAL;

}



out_err:

	if (opts)

		smack_free_mnt_opts(opts);

/**

 * smack_parse_opts_str - parse Smack specific mount options

 * @options: mount options string

 * @opts: where to store converted mount opts

 *

 * Returns 0 on success or -ENOMEM on error.

 *

 * converts Smack specific mount options to generic security option format

 */

static int smack_parse_opts_str(char *options,

		void **mnt_opts)

{

	char *p;

	int rc = -ENOMEM;

	int token;



	if (!options)

		return 0;



	while ((p = strsep(&options, ",")) != NULL) {

		substring_t args[MAX_OPT_ARGS];

		const char *arg;



		if (!*p)

			continue;



		token = match_token(p, smk_mount_tokens, args);



		arg = match_strdup(&args[0]);

		rc = smack_add_opt(token, arg, mnt_opts);

		if (unlikely(rc)) {

			kfree(arg);

			if (*mnt_opts)

				smack_free_mnt_opts(*mnt_opts);

			*mnt_opts = NULL;

			return rc;

		}

	}

	return 0;

}



static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)

{