fanotify: groups can specify their f_flags for new fd

Currently fanotify fds opened for thier listeners are done with f_flags
equal to O_RDONLY | O_LARGEFILE.  This patch instead takes f_flags from the
fanotify_init syscall and uses those when opening files in the context of
the listener.

Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index da01091f93eb..7182c83be90e 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -81,7 +81,7 @@ static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event)
          * are NULL;  That's fine, just don't call dentry open */
         if (dentry && mnt)
                 new_file = dentry_open(dentry, mnt,
-                                       O_RDONLY | O_LARGEFILE | FMODE_NONOTIFY,
+                                       group->fanotify_data.f_flags | FMODE_NONOTIFY,
                                        current_cred());
         else
                 new_file = ERR_PTR(-EOVERFLOW);
@@ -625,9 +625,6 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
         pr_debug("%s: flags=%d event_f_flags=%d\n",
                 __func__, flags, event_f_flags);
 
-        if (event_f_flags)
-                return -EINVAL;
-
         if (!capable(CAP_SYS_ADMIN))
                 return -EACCES;
 
@@ -645,6 +642,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
         if (IS_ERR(group))
                 return PTR_ERR(group);
 
+        group->fanotify_data.f_flags = event_f_flags;
 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
         mutex_init(&group->fanotify_data.access_mutex);
         init_waitqueue_head(&group->fanotify_data.access_waitq);