linux-kernel - [ 16/34] ecryptfs: read on a directory should return EISDIR if not supported

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Message-Id: <20120301213924.846787322@linuxfoundation.org>
Date:	Thu, 01 Mar 2012 13:39:38 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Andy Whitcroft <apw@...onical.com>,
	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
Subject: [ 16/34] ecryptfs: read on a directory should return EISDIR if not supported

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Andy Whitcroft <apw@...onical.com>

commit 323ef68faf1bbd9b1e66aea268fd09d358d7e8ab upstream.

read() calls against a file descriptor connected to a directory are
incorrectly returning EINVAL rather than EISDIR:

  [EISDIR]
    [XSI] [Option Start] The fildes argument refers to a directory and the
    implementation does not allow the directory to be read using read()
    or pread(). The readdir() function should be used instead. [Option End]

This occurs because we do not have a .read operation defined for
ecryptfs directories.  Connect this up to generic_read_dir().

BugLink: http://bugs.launchpad.net/bugs/719691
Signed-off-by: Andy Whitcroft <apw@...onical.com>
Signed-off-by: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>

---
 fs/ecryptfs/file.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -323,6 +323,7 @@ ecryptfs_compat_ioctl(struct file *file,
 
 const struct file_operations ecryptfs_dir_fops = {
 	.readdir = ecryptfs_readdir,
+	.read = generic_read_dir,
 	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = ecryptfs_compat_ioctl,


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