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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: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Namhyung Kim
Paul Moore
parent
5c7001b84b
commit
4b6f405f72
@ -1080,6 +1080,26 @@ out:
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* binary representation file.
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*/
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static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
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{
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int rc;
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char *str;
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str = kmalloc(len + 1, flags);
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if (!str)
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return -ENOMEM;
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/* it's expected the caller should free the str */
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*strp = str;
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rc = next_entry(str, fp, len);
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if (rc)
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return rc;
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str[len] = '\0';
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return 0;
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}
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static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
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{
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char *key = NULL;
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@ -1100,15 +1120,9 @@ static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
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len = le32_to_cpu(buf[0]);
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perdatum->value = le32_to_cpu(buf[1]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_KERNEL);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_KERNEL, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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rc = hashtab_insert(h, key, perdatum);
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if (rc)
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@ -1146,15 +1160,9 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp)
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comdatum->permissions.nprim = le32_to_cpu(buf[2]);
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nel = le32_to_cpu(buf[3]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_KERNEL);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_KERNEL, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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for (i = 0; i < nel; i++) {
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rc = perm_read(p, comdatum->permissions.table, fp);
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@ -1321,25 +1329,14 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp)
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ncons = le32_to_cpu(buf[5]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_KERNEL);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_KERNEL, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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if (len2) {
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rc = -ENOMEM;
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cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
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if (!cladatum->comkey)
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goto bad;
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rc = next_entry(cladatum->comkey, fp, len2);
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rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
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if (rc)
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goto bad;
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cladatum->comkey[len2] = '\0';
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rc = -EINVAL;
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cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
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@ -1422,15 +1419,9 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp)
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if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
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role->bounds = le32_to_cpu(buf[2]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_KERNEL);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_KERNEL, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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rc = ebitmap_read(&role->dominates, fp);
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if (rc)
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@ -1495,14 +1486,9 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp)
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typdatum->primary = le32_to_cpu(buf[2]);
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}
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_KERNEL);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_KERNEL, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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rc = hashtab_insert(h, key, typdatum);
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if (rc)
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@ -1565,14 +1551,9 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp)
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if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
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usrdatum->bounds = le32_to_cpu(buf[2]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_KERNEL);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_KERNEL, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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rc = ebitmap_read(&usrdatum->roles, fp);
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if (rc)
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@ -1616,14 +1597,9 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
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len = le32_to_cpu(buf[0]);
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levdatum->isalias = le32_to_cpu(buf[1]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_ATOMIC);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_ATOMIC, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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rc = -ENOMEM;
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levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
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@ -1664,14 +1640,9 @@ static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
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catdatum->value = le32_to_cpu(buf[1]);
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catdatum->isalias = le32_to_cpu(buf[2]);
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rc = -ENOMEM;
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key = kmalloc(len + 1, GFP_ATOMIC);
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if (!key)
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goto bad;
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rc = next_entry(key, fp, len);
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rc = str_read(&key, GFP_ATOMIC, fp, len);
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if (rc)
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goto bad;
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key[len] = '\0';
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rc = hashtab_insert(h, key, catdatum);
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if (rc)
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@ -1968,19 +1939,13 @@ static int filename_trans_read(struct policydb *p, void *fp)
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goto out;
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len = le32_to_cpu(buf[0]);
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rc = -ENOMEM;
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name = kmalloc(len + 1, GFP_KERNEL);
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if (!name)
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/* path component string */
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rc = str_read(&name, GFP_KERNEL, fp, len);
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if (rc)
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goto out;
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ft->name = name;
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/* path component string */
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rc = next_entry(name, fp, len);
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if (rc)
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goto out;
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name[len] = 0;
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rc = next_entry(buf, fp, sizeof(u32) * 4);
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if (rc)
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goto out;
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@ -2045,17 +2010,10 @@ static int genfs_read(struct policydb *p, void *fp)
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if (!newgenfs)
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goto out;
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rc = -ENOMEM;
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newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
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if (!newgenfs->fstype)
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goto out;
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rc = next_entry(newgenfs->fstype, fp, len);
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rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
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if (rc)
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goto out;
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newgenfs->fstype[len] = 0;
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for (genfs_p = NULL, genfs = p->genfs; genfs;
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genfs_p = genfs, genfs = genfs->next) {
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rc = -EINVAL;
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@ -2091,15 +2049,9 @@ static int genfs_read(struct policydb *p, void *fp)
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if (!newc)
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goto out;
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rc = -ENOMEM;
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newc->u.name = kmalloc(len + 1, GFP_KERNEL);
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if (!newc->u.name)
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goto out;
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rc = next_entry(newc->u.name, fp, len);
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rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
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if (rc)
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goto out;
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newc->u.name[len] = 0;
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rc = next_entry(buf, fp, sizeof(u32));
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if (rc)
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@ -2189,16 +2141,10 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
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goto out;
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len = le32_to_cpu(buf[0]);
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rc = -ENOMEM;
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c->u.name = kmalloc(len + 1, GFP_KERNEL);
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if (!c->u.name)
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goto out;
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rc = next_entry(c->u.name, fp, len);
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rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
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if (rc)
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goto out;
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c->u.name[len] = 0;
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rc = context_read_and_validate(&c->context[0], p, fp);
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if (rc)
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goto out;
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@ -2240,16 +2186,11 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
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if (c->v.behavior > SECURITY_FS_USE_MAX)
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goto out;
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rc = -ENOMEM;
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len = le32_to_cpu(buf[1]);
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c->u.name = kmalloc(len + 1, GFP_KERNEL);
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if (!c->u.name)
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goto out;
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rc = next_entry(c->u.name, fp, len);
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rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
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if (rc)
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goto out;
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c->u.name[len] = 0;
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rc = context_read_and_validate(&c->context[0], p, fp);
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if (rc)
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goto out;
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