if (IS_ERR(p))
return PTR_ERR(p);
+ ret = -ENOMEM;
clone = posix_acl_clone(p, GFP_NOFS);
if (!clone)
- goto no_mem;
+ goto err_release;
ret = posix_acl_create_masq(clone, mode);
if (ret < 0)
- goto no_mem_clone;
+ goto err_release_clone;
if (ret == 0)
posix_acl_release(clone);
return 0;
-no_mem_clone:
+err_release_clone:
posix_acl_release(clone);
-no_mem:
+err_release:
posix_acl_release(p);
- return -ENOMEM;
+ return ret;
}
EXPORT_SYMBOL_GPL(posix_acl_create);
+/**
+ * posix_acl_update_mode - update mode in set_acl
+ *
+ * Update the file mode when setting an ACL: compute the new file permission
+ * bits based on the ACL. In addition, if the ACL is equivalent to the new
+ * file mode, set *acl to NULL to indicate that no ACL should be set.
+ *
+ * As with chmod, clear the setgit bit if the caller is not in the owning group
+ * or capable of CAP_FSETID (see inode_change_ok).
+ *
+ * Called from set_acl inode operations.
+ */
+int posix_acl_update_mode(struct inode *inode, umode_t *mode_p,
+ struct posix_acl **acl)
+{
+ umode_t mode = inode->i_mode;
+ int error;
+
+ error = posix_acl_equiv_mode(*acl, &mode);
+ if (error < 0)
+ return error;
+ if (error == 0)
+ *acl = NULL;
+ if (!in_group_p(inode->i_gid) &&
+ !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+ mode &= ~S_ISGID;
+ *mode_p = mode;
+ return 0;
+}
+EXPORT_SYMBOL(posix_acl_update_mode);
+
/*
* Fix up the uids and gids in posix acl extended attributes in place.
*/
-static void posix_acl_fix_xattr_userns(
+int posix_acl_fix_xattr_userns(
struct user_namespace *to, struct user_namespace *from,
void *value, size_t size)
{
- posix_acl_xattr_header *header = (posix_acl_xattr_header *)value;
- posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end;
+ struct posix_acl_xattr_header *header = value;
+ struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end;
int count;
- kuid_t uid;
- kgid_t gid;
+ kuid_t kuid;
+ kgid_t kgid;
+ uid_t uid;
+ gid_t gid;
+ int ret = 0;
+ if (to == from)
+ return 0;
if (!value)
- return;
- if (size < sizeof(posix_acl_xattr_header))
- return;
+ return 0;
+ if (size < sizeof(struct posix_acl_xattr_header))
+ return -EINVAL;
if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
- return;
+ return -EINVAL;
count = posix_acl_xattr_count(size);
if (count < 0)
- return;
+ return -EINVAL;
if (count == 0)
- return;
+ return 0;
for (end = entry + count; entry != end; entry++) {
switch(le16_to_cpu(entry->e_tag)) {
case ACL_USER:
- uid = make_kuid(from, le32_to_cpu(entry->e_id));
- entry->e_id = cpu_to_le32(from_kuid(to, uid));
+ kuid = make_kuid(from, le32_to_cpu(entry->e_id));
+ uid = from_kuid(to, kuid);
+ entry->e_id = cpu_to_le32(uid);
+ if (uid == (uid_t)-1)
+ ret = -EOVERFLOW;
break;
case ACL_GROUP:
- gid = make_kgid(from, le32_to_cpu(entry->e_id));
- entry->e_id = cpu_to_le32(from_kgid(to, gid));
+ kgid = make_kgid(from, le32_to_cpu(entry->e_id));
+ gid = from_kgid(to, kgid);
+ entry->e_id = cpu_to_le32(gid);
+ if (gid == (gid_t)-1)
+ ret = -EOVERFLOW;
break;
default:
break;
}
}
+
+ return ret;
}
+EXPORT_SYMBOL(posix_acl_fix_xattr_userns);
void posix_acl_fix_xattr_from_user(void *value, size_t size)
{
struct user_namespace *user_ns = current_user_ns();
- if (user_ns == &init_user_ns)
- return;
posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
}
void posix_acl_fix_xattr_to_user(void *value, size_t size)
{
struct user_namespace *user_ns = current_user_ns();
- if (user_ns == &init_user_ns)
- return;
posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
}
posix_acl_from_xattr(struct user_namespace *user_ns,
const void *value, size_t size)
{
- posix_acl_xattr_header *header = (posix_acl_xattr_header *)value;
- posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end;
+ const struct posix_acl_xattr_header *header = value;
+ const struct posix_acl_xattr_entry *entry = (const void *)(header + 1), *end;
int count;
struct posix_acl *acl;
struct posix_acl_entry *acl_e;
if (!value)
return NULL;
- if (size < sizeof(posix_acl_xattr_header))
+ if (size < sizeof(struct posix_acl_xattr_header))
return ERR_PTR(-EINVAL);
if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
return ERR_PTR(-EOPNOTSUPP);
posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
void *buffer, size_t size)
{
- posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer;
- posix_acl_xattr_entry *ext_entry;
+ struct posix_acl_xattr_header *ext_acl = buffer;
+ struct posix_acl_xattr_entry *ext_entry;
int real_size, n;
real_size = posix_acl_xattr_size(acl->a_count);
if (real_size > size)
return -ERANGE;
- ext_entry = ext_acl->a_entries;
+ ext_entry = (void *)(ext_acl + 1);
ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
for (n=0; n < acl->a_count; n++, ext_entry++) {
int error;
if (type == ACL_TYPE_ACCESS) {
- error = posix_acl_equiv_mode(acl, &inode->i_mode);
- if (error < 0)
- return 0;
- if (error == 0)
- acl = NULL;
+ error = posix_acl_update_mode(inode,
+ &inode->i_mode, &acl);
+ if (error)
+ return error;
}
- inode->i_ctime = CURRENT_TIME;
+ inode->i_ctime = current_time(inode);
set_cached_acl(inode, type, acl);
return 0;
}
projects / mirror_ubuntu-zesty-kernel.git / blobdiff