diff options
Diffstat (limited to 'fs/notify/inotify/inotify_user.c')
| -rw-r--r-- | fs/notify/inotify/inotify_user.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c index 5b1e2a497e51..b8d08d0d0a4d 100644 --- a/fs/notify/inotify/inotify_user.c +++ b/fs/notify/inotify/inotify_user.c @@ -706,7 +706,19 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, int ret; unsigned flags = 0; - /* don't allow invalid bits: we don't want flags set */ + /* + * We share a lot of code with fs/dnotify. We also share + * the bit layout between inotify's IN_* and the fsnotify + * FS_*. This check ensures that only the inotify IN_* + * bits get passed in and set in watches/events. + */ + if (unlikely(mask & ~ALL_INOTIFY_BITS)) + return -EINVAL; + /* + * Require at least one valid bit set in the mask. + * Without _something_ set, we would have no events to + * watch for. + */ if (unlikely(!(mask & ALL_INOTIFY_BITS))) return -EINVAL; |