On Tue, Oct 19, 2021 at 3:04 AM Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx> wrote: > > Wire up the FAN_FS_ERROR event in the fanotify_mark syscall, allowing > user space to request the monitoring of FAN_FS_ERROR events. > > These events are limited to filesystem marks, so check it is the > case in the syscall handler. > > Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx> > Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx> > --- > Changes since v7: > - Move the verification closer to similar code (Amir) > --- > fs/notify/fanotify/fanotify.c | 2 +- > fs/notify/fanotify/fanotify_user.c | 4 ++++ > include/linux/fanotify.h | 6 +++++- > 3 files changed, 10 insertions(+), 2 deletions(-) > > diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c > index 0f6694eadb63..20169b8d5ab7 100644 > --- a/fs/notify/fanotify/fanotify.c > +++ b/fs/notify/fanotify/fanotify.c > @@ -821,7 +821,7 @@ static int fanotify_handle_event(struct fsnotify_group *group, u32 mask, > BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM); > BUILD_BUG_ON(FAN_FS_ERROR != FS_ERROR); > > - BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19); > + BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 20); > > mask = fanotify_group_event_mask(group, iter_info, mask, data, > data_type, dir); > diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c > index b83c61c934d0..22dca806c7e2 100644 > --- a/fs/notify/fanotify/fanotify_user.c > +++ b/fs/notify/fanotify/fanotify_user.c > @@ -1535,6 +1535,10 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask, > group->priority == FS_PRIO_0) > goto fput_and_out; > > + if (mask & FAN_FS_ERROR && > + mark_type != FAN_MARK_FILESYSTEM) > + goto fput_and_out; > + > /* > * Events that do not carry enough information to report > * event->fd require a group that supports reporting fid. Those > diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h > index 52d464802d99..616af2ea20f3 100644 > --- a/include/linux/fanotify.h > +++ b/include/linux/fanotify.h > @@ -91,9 +91,13 @@ extern struct ctl_table fanotify_table[]; /* for sysctl */ > #define FANOTIFY_INODE_EVENTS (FANOTIFY_DIRENT_EVENTS | \ > FAN_ATTRIB | FAN_MOVE_SELF | FAN_DELETE_SELF) > > +/* Events that can only be reported with data type FSNOTIFY_EVENT_ERROR */ > +#define FANOTIFY_ERROR_EVENTS (FAN_FS_ERROR) > + > /* Events that user can request to be notified on */ > #define FANOTIFY_EVENTS (FANOTIFY_PATH_EVENTS | \ > - FANOTIFY_INODE_EVENTS) > + FANOTIFY_INODE_EVENTS | \ > + FANOTIFY_ERROR_EVENTS) > > /* Events that require a permission response from user */ > #define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM | \ > -- > 2.33.0 >
