From 9fe79d7600497ed8a95c3981cbe5b73ab98222f0 Mon Sep 17 00:00:00 2001 From: Tyler Hicks Date: Tue, 12 Jun 2012 11:17:01 -0700 Subject: eCryptfs: Properly check for O_RDONLY flag before doing privileged open If the first attempt at opening the lower file read/write fails, eCryptfs will retry using a privileged kthread. However, the privileged retry should not happen if the lower file's inode is read-only because a read/write open will still be unsuccessful. The check for determining if the open should be retried was intended to be based on the access mode of the lower file's open flags being O_RDONLY, but the check was incorrectly performed. This would cause the open to be retried by the privileged kthread, resulting in a second failed open of the lower file. This patch corrects the check to determine if the open request should be handled by the privileged kthread. Signed-off-by: Tyler Hicks Reported-by: Dan Carpenter Acked-by: Dan Carpenter diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c index 69f994a..0dbe58a 100644 --- a/fs/ecryptfs/kthread.c +++ b/fs/ecryptfs/kthread.c @@ -149,7 +149,7 @@ int ecryptfs_privileged_open(struct file **lower_file, (*lower_file) = dentry_open(lower_dentry, lower_mnt, flags, cred); if (!IS_ERR(*lower_file)) goto out; - if (flags & O_RDONLY) { + if ((flags & O_ACCMODE) == O_RDONLY) { rc = PTR_ERR((*lower_file)); goto out; } -- cgit v0.10.2