linux-kernel - [patch 121/149] GFS2: Fix permissions checking for setflags ioctl()

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Message-Id: <20100701173217.021158977@clark.site>
Date:	Thu, 01 Jul 2010 10:32:27 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [patch 121/149] GFS2: Fix permissions checking for setflags ioctl()

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Steven Whitehouse <swhiteho@...hat.com>

commit 7df0e0397b9a18358573274db9fdab991941062f upstream.

We should be checking for the ownership of the file for which
flags are being set, rather than just for write access.

Reported-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/gfs2/file.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -218,6 +218,11 @@ static int do_gfs2_set_flags(struct file
 	if (error)
 		goto out_drop_write;
 
+	error = -EACCES;
+	if (!is_owner_or_cap(inode))
+		goto out;
+
+	error = 0;
 	flags = ip->i_diskflags;
 	new_flags = (flags & ~mask) | (reqflags & mask);
 	if ((new_flags ^ flags) == 0)
@@ -275,8 +280,10 @@ static int gfs2_set_flags(struct file *f
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	u32 fsflags, gfsflags;
+
 	if (get_user(fsflags, ptr))
 		return -EFAULT;
+
 	gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
 	if (!S_ISDIR(inode->i_mode)) {
 		if (gfsflags & GFS2_DIF_INHERIT_JDATA)


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