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Message-Id: <20100524230351.313162248@clark.site>
Date: Mon, 24 May 2010 15:59:54 -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,
Chris Mason <chris.mason@...cle.com>
Subject: [22/34] Btrfs: check for read permission on src file in the clone ioctl
2.6.34-stable review patch. If anyone has any objections, please let us know.
------------------
From: Dan Rosenberg <dan.j.rosenberg@...il.com>
commit 5dc6416414fb3ec6e2825fd4d20c8bf1d7fe0395 upstream.
The existing code would have allowed you to clone a file that was
only open for writing
Signed-off-by: Chris Mason <chris.mason@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
fs/btrfs/ioctl.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -959,12 +959,17 @@ static noinline long btrfs_ioctl_clone(s
ret = -EBADF;
goto out_drop_write;
}
+
src = src_file->f_dentry->d_inode;
ret = -EINVAL;
if (src == inode)
goto out_fput;
+ /* the src must be open for reading */
+ if (!(src_file->f_mode & FMODE_READ))
+ goto out_fput;
+
ret = -EISDIR;
if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
goto out_fput;
--
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