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Commit c3300aaf authored by Al Viro's avatar Al Viro
Browse files

smack: get rid of match_token() 



same issue as with selinux...

[fix by Andrei Vagin folded in]

Reviewed-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 55c0e5bd

security/smack/smack_lsm.c

+38 −18
Original line number Diff line number Diff line
@@ -59,14 +59,31 @@ static LIST_HEAD(smk_ipv6_port_list); 
static struct kmem_cache *smack_inode_cache;

int smack_enabled;



static const match_table_t smk_mount_tokens = {

	{Opt_fsdefault, SMK_FSDEFAULT "%s"},

	{Opt_fsfloor, SMK_FSFLOOR "%s"},

	{Opt_fshat, SMK_FSHAT "%s"},

	{Opt_fsroot, SMK_FSROOT "%s"},

	{Opt_fstransmute, SMK_FSTRANS "%s"},

	{Opt_error, NULL},

#define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}

static struct {

	const char *name;

	int len;

	int opt;

} smk_mount_opts[] = {

	A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute)

};

#undef A



static int match_opt_prefix(char *s, int l, char **arg)

{

	int i;



	for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) {

		size_t len = smk_mount_opts[i].len;

		if (len > l || memcmp(s, smk_mount_opts[i].name, len))

			continue;

		if (len == l || s[len] != '=')

			continue;

		*arg = s + len + 1;

		return smk_mount_opts[i].opt;

	}

	return Opt_error;

}



#ifdef CONFIG_SECURITY_SMACK_BRINGUP

static char *smk_bu_mess[] = {
@@ -689,23 +706,23 @@ static int smack_add_opt(int token, const char *s, void **mnt_opts) 
static int smack_parse_opts_str(char *options,

		void **mnt_opts)

{

	char *p;

	int rc = -ENOMEM;

	int token;

	char *from = options;



	if (!options)

		return 0;



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

		substring_t args[MAX_OPT_ARGS];

		const char *arg;



		if (!*p)

			continue;

	while (1) {

		char *next = strchr(from, ',');

		int token, len, rc;

		char *arg = NULL;



		token = match_token(p, smk_mount_tokens, args);

		if (next)

			len = next - from;

		else

			len = strlen(from);



		arg = match_strdup(&args[0]);

		token = match_opt_prefix(from, len, &arg);

		arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL);

		rc = smack_add_opt(token, arg, mnt_opts);

		if (unlikely(rc)) {

			kfree(arg);
@@ -714,6 +731,9 @@ static int smack_parse_opts_str(char *options, 
			*mnt_opts = NULL;

			return rc;

		}

		if (!from[len])

			break;

		from += len + 1;

	}

	return 0;

}