linux-kernel - [096/111] ext4: Make sure the MOVE_EXT ioctl cant overwrite append-only files

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Message-Id: <20100811235504.434865196@clark.site>
Date:	Wed, 11 Aug 2010 16:55:17 -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,
	"Theodore Tso" <tytso@....edu>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>
Subject: [096/111] ext4: Make sure the MOVE_EXT ioctl cant overwrite append-only files

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

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

From: Theodore Ts'o <tytso@....edu>

commit 1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72 upstream.

Dan Roseberg has reported a problem with the MOVE_EXT ioctl.  If the
donor file is an append-only file, we should not allow the operation
to proceed, lest we end up overwriting the contents of an append-only
file.

Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Cc: Dan Rosenberg <dan.j.rosenberg@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/ext4/move_extent.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -958,6 +958,9 @@ mext_check_arguments(struct inode *orig_
 		return -EINVAL;
 	}
 
+	if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode))
+		return -EPERM;
+
 	/* Ext4 move extent does not support swapfile */
 	if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) {
 		ext4_debug("ext4 move extent: The argument files should "


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