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Commit 4b6f405f authored by Namhyung Kim's avatar Namhyung Kim Committed by Paul Moore
Browse files

selinux: introduce str_read() helper 



There're some code duplication for reading a string value during
policydb_read().  Add str_read() helper to fix it.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Signed-off-by: default avatarPaul Moore <pmoore@redhat.com>
parent 5c7001b8

security/selinux/ss/policydb.c

+37 −96
Original line number Diff line number Diff line
@@ -1080,6 +1080,26 @@ static int context_read_and_validate(struct context *c, 
 * binary representation file.

 */



static int str_read(char **strp, gfp_t flags, void *fp, u32 len)

{

	int rc;

	char *str;



	str = kmalloc(len + 1, flags);

	if (!str)

		return -ENOMEM;



	/* it's expected the caller should free the str */

	*strp = str;



	rc = next_entry(str, fp, len);

	if (rc)

		return rc;



	str[len] = '\0';

	return 0;

}



static int perm_read(struct policydb *p, struct hashtab *h, void *fp)

{

	char *key = NULL;
@@ -1100,15 +1120,9 @@ static int perm_read(struct policydb *p, struct hashtab *h, void *fp) 
	len = le32_to_cpu(buf[0]);

	perdatum->value = le32_to_cpu(buf[1]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_KERNEL);

	if (!key)

		goto bad;



	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_KERNEL, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	rc = hashtab_insert(h, key, perdatum);

	if (rc)
@@ -1146,15 +1160,9 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp) 
	comdatum->permissions.nprim = le32_to_cpu(buf[2]);

	nel = le32_to_cpu(buf[3]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_KERNEL);

	if (!key)

		goto bad;



	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_KERNEL, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	for (i = 0; i < nel; i++) {

		rc = perm_read(p, comdatum->permissions.table, fp);
@@ -1321,25 +1329,14 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) 


	ncons = le32_to_cpu(buf[5]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_KERNEL);

	if (!key)

		goto bad;



	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_KERNEL, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	if (len2) {

		rc = -ENOMEM;

		cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);

		if (!cladatum->comkey)

			goto bad;

		rc = next_entry(cladatum->comkey, fp, len2);

		rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);

		if (rc)

			goto bad;

		cladatum->comkey[len2] = '\0';



		rc = -EINVAL;

		cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
@@ -1422,15 +1419,9 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) 
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)

		role->bounds = le32_to_cpu(buf[2]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_KERNEL);

	if (!key)

		goto bad;



	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_KERNEL, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	rc = ebitmap_read(&role->dominates, fp);

	if (rc)
@@ -1495,14 +1486,9 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) 
		typdatum->primary = le32_to_cpu(buf[2]);

	}



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_KERNEL);

	if (!key)

		goto bad;

	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_KERNEL, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	rc = hashtab_insert(h, key, typdatum);

	if (rc)
@@ -1565,14 +1551,9 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) 
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)

		usrdatum->bounds = le32_to_cpu(buf[2]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_KERNEL);

	if (!key)

		goto bad;

	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_KERNEL, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	rc = ebitmap_read(&usrdatum->roles, fp);

	if (rc)
@@ -1616,14 +1597,9 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp) 
	len = le32_to_cpu(buf[0]);

	levdatum->isalias = le32_to_cpu(buf[1]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_ATOMIC);

	if (!key)

		goto bad;

	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_ATOMIC, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	rc = -ENOMEM;

	levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
@@ -1664,14 +1640,9 @@ static int cat_read(struct policydb *p, struct hashtab *h, void *fp) 
	catdatum->value = le32_to_cpu(buf[1]);

	catdatum->isalias = le32_to_cpu(buf[2]);



	rc = -ENOMEM;

	key = kmalloc(len + 1, GFP_ATOMIC);

	if (!key)

		goto bad;

	rc = next_entry(key, fp, len);

	rc = str_read(&key, GFP_ATOMIC, fp, len);

	if (rc)

		goto bad;

	key[len] = '\0';



	rc = hashtab_insert(h, key, catdatum);

	if (rc)
@@ -1968,18 +1939,12 @@ static int filename_trans_read(struct policydb *p, void *fp) 
			goto out;

		len = le32_to_cpu(buf[0]);



		rc = -ENOMEM;

		name = kmalloc(len + 1, GFP_KERNEL);

		if (!name)

			goto out;



		ft->name = name;



		/* path component string */

		rc = next_entry(name, fp, len);

		rc = str_read(&name, GFP_KERNEL, fp, len);

		if (rc)

			goto out;

		name[len] = 0;



		ft->name = name;



		rc = next_entry(buf, fp, sizeof(u32) * 4);

		if (rc)
@@ -2045,17 +2010,10 @@ static int genfs_read(struct policydb *p, void *fp) 
		if (!newgenfs)

			goto out;



		rc = -ENOMEM;

		newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);

		if (!newgenfs->fstype)

			goto out;



		rc = next_entry(newgenfs->fstype, fp, len);

		rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);

		if (rc)

			goto out;



		newgenfs->fstype[len] = 0;



		for (genfs_p = NULL, genfs = p->genfs; genfs;

		     genfs_p = genfs, genfs = genfs->next) {

			rc = -EINVAL;
@@ -2091,15 +2049,9 @@ static int genfs_read(struct policydb *p, void *fp) 
			if (!newc)

				goto out;



			rc = -ENOMEM;

			newc->u.name = kmalloc(len + 1, GFP_KERNEL);

			if (!newc->u.name)

				goto out;



			rc = next_entry(newc->u.name, fp, len);

			rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);

			if (rc)

				goto out;

			newc->u.name[len] = 0;



			rc = next_entry(buf, fp, sizeof(u32));

			if (rc)
@@ -2189,16 +2141,10 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, 
					goto out;

				len = le32_to_cpu(buf[0]);



				rc = -ENOMEM;

				c->u.name = kmalloc(len + 1, GFP_KERNEL);

				if (!c->u.name)

					goto out;



				rc = next_entry(c->u.name, fp, len);

				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);

				if (rc)

					goto out;



				c->u.name[len] = 0;

				rc = context_read_and_validate(&c->context[0], p, fp);

				if (rc)

					goto out;
@@ -2240,16 +2186,11 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, 
				if (c->v.behavior > SECURITY_FS_USE_MAX)

					goto out;



				rc = -ENOMEM;

				len = le32_to_cpu(buf[1]);

				c->u.name = kmalloc(len + 1, GFP_KERNEL);

				if (!c->u.name)

					goto out;



				rc = next_entry(c->u.name, fp, len);

				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);

				if (rc)

					goto out;

				c->u.name[len] = 0;



				rc = context_read_and_validate(&c->context[0], p, fp);

				if (rc)

					goto out;