int ext4_to_fuse_acl(acl_ea_header **facl, size_t *facl_sz,
const ext4_acl_header *eacl, size_t eacl_sz)
{
int i, eacl_count;
acl_ea_header *f;
ext4_acl_entry *e;
acl_ea_entry *a;
size_t f_sz;
unsigned char *hptr;
int err = 0;
eacl_count = ext4_acl_count(eacl_sz);
f_sz = acl_ea_size(eacl_count);
if (eacl_count < 0 ||
eacl->a_version != ext2fs_cpu_to_le32(EXT4_ACL_VERSION))
return -EINVAL;
f = malloc(f_sz);
if (!f)
return -ENOMEM;
f->a_version = ACL_EA_VERSION;
hptr = (unsigned char *) (eacl + 1);
for (i = 0, a = f->a_entries; i < eacl_count; i++, a++) {
e = (ext4_acl_entry *) hptr;
a->e_tag = ext2fs_le16_to_cpu(e->e_tag);
a->e_perm = ext2fs_le16_to_cpu(e->e_perm);
switch (a->e_tag) {
case ACL_USER:
case ACL_GROUP:
a->e_id = ext2fs_le32_to_cpu(e->e_id);
hptr += sizeof(ext4_acl_entry);
break;
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
hptr += sizeof(ext4_acl_entry_short);
break;
default:
err = -EINVAL;
goto out;
}
}
*facl = f;
*facl_sz = f_sz;
return err;
out:
free(f);
return err;
}
/*
* Convert from filesystem to in-memory representation.
*/
static struct posix_acl *
ext4_acl_from_disk(const void *value, size_t size)
{
const char *end = (char *)value + size;
int n, count;
struct posix_acl *acl;
if (!value)
return NULL;
if (size < sizeof(ext4_acl_header))
return ERR_PTR(-EINVAL);
if (((ext4_acl_header *)value)->a_version !=
cpu_to_le32(EXT4_ACL_VERSION))
return ERR_PTR(-EINVAL);
value = (char *)value + sizeof(ext4_acl_header);
count = ext4_acl_count(size);
if (count < 0)
return ERR_PTR(-EINVAL);
if (count == 0)
return NULL;
acl = posix_acl_alloc(count, GFP_NOFS);
if (!acl)
return ERR_PTR(-ENOMEM);
for (n = 0; n < count; n++) {
ext4_acl_entry *entry =
(ext4_acl_entry *)value;
if ((char *)value + sizeof(ext4_acl_entry_short) > end)
goto fail;
acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
switch (acl->a_entries[n].e_tag) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
value = (char *)value +
sizeof(ext4_acl_entry_short);
acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
break;
case ACL_USER:
case ACL_GROUP:
value = (char *)value + sizeof(ext4_acl_entry);
if ((char *)value > end)
goto fail;
acl->a_entries[n].e_id =
le32_to_cpu(entry->e_id);
break;
default:
goto fail;
}
}
if (value != end)
goto fail;
return acl;
fail:
posix_acl_release(acl);
return ERR_PTR(-EINVAL);
}