VFS: provide correct root directory for lookups

This fixes a VFS panic and a chroot(2) security hole.

Change-Id: Ifd1923f886501cf3a73277aab89db974798c47dc

diff --git a/minix/servers/vfs/path.c b/minix/servers/vfs/path.c
index 3ee444ea077ecaf0f2a5348c28ffb2118fac712e..ffbc67d3d9ed0c635ae656ebc0486f3b5b0cb8c3 100644 (file)
--- a/minix/servers/vfs/path.c
+++ b/minix/servers/vfs/path.c
@@ -430,7 +430,7 @@ struct fproc *rfp;
 
   /* Is the process' root directory on the same partition?,
    * if so, set the chroot directory too. */
-  if (rfp->fp_rd->v_dev == rfp->fp_wd->v_dev)
+  if (rfp->fp_rd->v_dev == start_node->v_dev)
        root_ino = rfp->fp_rd->v_inode_nr;
   else
        root_ino = 0;