Patch "ovl: Copy up underlying inode's ->i_mode to overlay inode" has been added to the 4.6-stable tree

This is a note to let you know that I've just added the patch titled

    ovl: Copy up underlying inode's ->i_mode to overlay inode

to the 4.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ovl-copy-up-underlying-inode-s-i_mode-to-overlay-inode.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Vivek Goyal <[email protected]>
Date: Fri, 1 Jul 2016 16:34:25 -0400
Subject: ovl: Copy up underlying inode's ->i_mode to overlay inode

From: Vivek Goyal <[email protected]>

commit 07a2daab49c549a37b5b744cbebb6e3f445f12bc upstream.

Right now when a new overlay inode is created, we initialize overlay inode's ->i_mode from underlying inode ->i_mode but we retain only file type bits (S_IFMT) and discard permission bits.

This patch changes it and retains permission bits too. This should allow overlay to do permission checks on overlay inode itself in task context.

[SzM] It also fixes clearing suid/sgid bits on write.

---
 fs/overlayfs/inode.c     |    3 +--
 fs/overlayfs/overlayfs.h |    1 +
 2 files changed, 2 insertions(+), 2 deletions(-)

@@ -423,12 +423,11 @@ struct inode *ovl_new_inode(struct super
 	if (!inode)
 		return NULL;
 
-	mode &= S_IFMT;
-
 	inode->i_ino = get_next_ino();
 	inode->i_mode = mode;
 	inode->i_flags |= S_NOATIME | S_NOCMTIME;
 
+	mode &= S_IFMT;
 	switch (mode) {
 	case S_IFDIR:
 		inode->i_private = oe;

@@ -185,6 +185,7 @@ static inline void ovl_copyattr(struct i
 {
 	to->i_uid = from->i_uid;
 	to->i_gid = from->i_gid;
+	to->i_mode = from->i_mode;
 }
 
 /* dir.c */

Patches currently in stable-queue which might be from [email protected] are

queue-4.6/ovl-copy-up-underlying-inode-s-i_mode-to-overlay-inode.patch