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authorTyler Hicks <tyhicks@canonical.com>2012-06-12 11:17:01 -0700
committerTyler Hicks <tyhicks@canonical.com>2012-07-03 16:34:09 -0700
commit9fe79d7600497ed8a95c3981cbe5b73ab98222f0 (patch)
tree802b94cedec2570945e323e4f2de4ba8fc8cb2b1 /fs/ecryptfs
parentff826b2b5b269ad440afa686ede879ccabfda387 (diff)
downloadlinux-9fe79d7600497ed8a95c3981cbe5b73ab98222f0.tar.gz
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 <tyhicks@canonical.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r--fs/ecryptfs/kthread.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c
index 69f994a7d52..0dbe58a8b17 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;
}