diff options
Diffstat (limited to 'fs/overlayfs/inode.c')
| -rw-r--r-- | fs/overlayfs/inode.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index ec0c2a050043..76546314e35f 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -98,6 +98,29 @@ int ovl_permission(struct inode *inode, int mask) realdentry = ovl_entry_real(oe, &is_upper); + if (ovl_is_default_permissions(inode)) { + struct kstat stat; + struct path realpath = { .dentry = realdentry }; + + if (mask & MAY_NOT_BLOCK) + return -ECHILD; + + realpath.mnt = ovl_entry_mnt_real(oe, inode, is_upper); + + err = vfs_getattr(&realpath, &stat); + if (err) + return err; + + if ((stat.mode ^ inode->i_mode) & S_IFMT) + return -ESTALE; + + inode->i_mode = stat.mode; + inode->i_uid = stat.uid; + inode->i_gid = stat.gid; + + return generic_permission(inode, mask); + } + /* Careful in RCU walk mode */ realinode = ACCESS_ONCE(realdentry->d_inode); if (!realinode) { |