linux-kernel - [PATCH 8/9] Unionfs: fix unionfs_setattr to handle ATTR_KILL

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Message-Id: <1193010686931-git-send-email-ezk@cs.sunysb.edu>
Date:	Sun, 21 Oct 2007 19:51:21 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>,
	Christoph Hellwig <hch@....de>,
	Jeff Layton <jlayton@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 8/9] Unionfs: fix unionfs_setattr to handle ATTR_KILL_S*ID

From: Jeff Layton <jlayton@...hat.com>

Don't allow unionfs_setattr to trip the BUG() in notify_change. Clear
ATTR_MODE if the either ATTR_KILL_S*ID is set. This also allows the
lower filesystem to interpret these bits in its own way.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
Cc: Josef 'Jeff' Sipek <jsipek@...sunysb.edu>
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/inode.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 4e59ace..6ca52f4 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -1048,6 +1048,13 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
 	bend = dbend(dentry);
 	inode = dentry->d_inode;
 
+	/*
+	 * mode change is for clearing setuid/setgid. Allow lower filesystem
+	 * to reinterpret it in its own way.
+	 */
+	if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+		ia->ia_valid &= ~ATTR_MODE;
+
 	for (bindex = bstart; (bindex <= bend) || (bindex == bstart);
 	     bindex++) {
 		lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
-- 
1.5.2.2

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