linux-kernel - [PATCH 4/5] ecryptfs: fixed testing of file descriptor flags

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Message-Id: <201011031111.35066.roberto.sassu@polito.it>
Date:	Wed, 3 Nov 2010 11:11:34 +0100
From:	Roberto Sassu <roberto.sassu@...ito.it>
To:	tyhicks@...ux.vnet.ibm.com
Cc:	kirkland@...onical.com, jmorris@...ei.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 4/5] ecryptfs: fixed testing of file descriptor flags

This patch replaces the check (lower_file->f_flags & O_RDONLY) with
((lower_file & O_ACCMODE) == O_RDONLY).

Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
---
 fs/ecryptfs/file.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 5cfcc3c..26bd93d 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -200,8 +200,8 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 			ecryptfs_dentry->d_name.name, rc);
 		goto out_free;
 	}
-	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
-	    && !(file->f_flags & O_RDONLY)) {
+	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE) == O_RDONLY
+	    && (file->f_flags & O_ACCMODE) != O_RDONLY) {
 		rc = -EPERM;
 		printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
 		       "file must hence be opened RO\n", __func__);
-- 
1.7.2.3


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