From e7b4aa7d99313d4fce05fc497a870819076f14ca Mon Sep 17 00:00:00 2001
From: David van Moolenbroek <david@minix3.org>
Date: Sun, 24 Aug 2014 09:27:02 +0000
Subject: [PATCH] VFS: provide correct root directory for lookups

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

Change-Id: Ifd1923f886501cf3a73277aab89db974798c47dc
---
 minix/servers/vfs/path.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/minix/servers/vfs/path.c b/minix/servers/vfs/path.c
index 3ee444ea0..ffbc67d3d 100644
--- 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;