diff options
| -rw-r--r-- | fs/namei.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/namei.c b/fs/namei.c index 186bd2464fd5..942c1f096f6b 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -984,13 +984,15 @@ static bool safe_hardlink_source(struct inode *inode) */ static int may_linkat(struct path *link) { - struct inode *inode; + struct inode *inode = link->dentry->d_inode; + + /* Inode writeback is not safe when the uid or gid are invalid. */ + if (!uid_valid(inode->i_uid) || !gid_valid(inode->i_gid)) + return -EOVERFLOW; if (!sysctl_protected_hardlinks) return 0; - inode = link->dentry->d_inode; - /* Source inode owner (or CAP_FOWNER) can hardlink all they like, * otherwise, it must be a safe source. */ @@ -2749,6 +2751,11 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir) BUG_ON(!inode); BUG_ON(victim->d_parent->d_inode != dir); + + /* Inode writeback is not safe when the uid or gid are invalid. */ + if (!uid_valid(inode->i_uid) || !gid_valid(inode->i_gid)) + return -EOVERFLOW; + audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); error = inode_permission(dir, MAY_WRITE | MAY_EXEC); |