mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-03 07:38:10 +00:00
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
1 changed files with 37 additions and 96 deletions
|
|
@ -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)
|
||||
|
|
@ -1968,19 +1939,13 @@ 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)
|
||||
/* path component string */
|
||||
rc = str_read(&name, GFP_KERNEL, fp, len);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
ft->name = name;
|
||||
|
||||
/* path component string */
|
||||
rc = next_entry(name, fp, len);
|
||||
if (rc)
|
||||
goto out;
|
||||
name[len] = 0;
|
||||
|
||||
rc = next_entry(buf, fp, sizeof(u32) * 4);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
|
@ -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;
|
||||
|
|
|
|||
Loading…
Reference in a new issue