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提交 4b6f405f 编写于 作者: N Namhyung Kim 提交者： Paul Moore
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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: NNamhyung Kim <namhyung@kernel.org>
Signed-off-by: NPaul Moore <pmoore@redhat.com>
上级 5c7001b8
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Showing with 37 addition and 96 deletion
security/selinux/ss/policydb.c
浏览文件 @ 4b6f405f
......@@ -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;
......
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