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xwayland: do not allow apps to change focus after wlroots request

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Ilia Bozhinov 2020-07-19 14:57:10 +02:00 committed by Simon Ser
parent 1dbcfdaf81
commit 74f7be7287
2 changed files with 19 additions and 4 deletions
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1
include/xwayland/xwm.h
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@ -128,6 +128,7 @@ struct wlr_xwm {
#if WLR_HAS_XCB_ERRORS #if WLR_HAS_XCB_ERRORS
xcb_errors_context_t *errors_context; xcb_errors_context_t *errors_context;
#endif #endif
unsigned int last_focus_seq;
struct wl_listener compositor_new_surface; struct wl_listener compositor_new_surface;
struct wl_listener compositor_destroy; struct wl_listener compositor_destroy;

22
xwayland/xwm.c
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@ -275,8 +275,9 @@ static void xwm_set_focus_window(struct wlr_xwm *xwm,
} else { } else {
xwm_send_wm_message(xsurface, &message_data, XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT); xwm_send_wm_message(xsurface, &message_data, XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT);
xcb_set_input_focus(xwm->xcb_conn, XCB_INPUT_FOCUS_POINTER_ROOT, xcb_void_cookie_t cookie = xcb_set_input_focus(xwm->xcb_conn,
xsurface->window_id, XCB_CURRENT_TIME); XCB_INPUT_FOCUS_POINTER_ROOT, xsurface->window_id, XCB_CURRENT_TIME);
xwm->last_focus_seq = cookie.sequence;
} }
uint32_t values[1]; uint32_t values[1];
@ -1293,6 +1294,16 @@ static void xwm_handle_client_message(struct wlr_xwm *xwm,
} }
} }
static bool validate_focus_serial(uint16_t last_focus_seq, uint16_t event_seq) {
uint16_t rev_dist = event_seq - last_focus_seq;
if (rev_dist >= UINT16_MAX / 2) {
// Probably overflow or too old
return false;
}
return true;
}
static void xwm_handle_focus_in(struct wlr_xwm *xwm, static void xwm_handle_focus_in(struct wlr_xwm *xwm,
xcb_focus_in_event_t *ev) { xcb_focus_in_event_t *ev) {
// Do not interfere with grabs // Do not interfere with grabs
@ -1311,10 +1322,13 @@ static void xwm_handle_focus_in(struct wlr_xwm *xwm,
// Note: Some applications rely on being able to change focus, for ex. Steam: // Note: Some applications rely on being able to change focus, for ex. Steam:
// https://github.com/swaywm/sway/issues/1865 // https://github.com/swaywm/sway/issues/1865
// Because of that, we allow changing focus between surfaces belonging to the // Because of that, we allow changing focus between surfaces belonging to the
// same application. // same application. We must be careful to ignore requests that are too old
// though, because otherwise it may lead to race conditions:
// https://github.com/swaywm/wlroots/issues/2324
struct wlr_xwayland_surface *requested_focus = lookup_surface(xwm, ev->event); struct wlr_xwayland_surface *requested_focus = lookup_surface(xwm, ev->event);
if (xwm->focus_surface && requested_focus && if (xwm->focus_surface && requested_focus &&
requested_focus->pid == xwm->focus_surface->pid) { requested_focus->pid == xwm->focus_surface->pid &&
validate_focus_serial(xwm->last_focus_seq, ev->sequence)) {
xwm_set_focus_window(xwm, requested_focus); xwm_set_focus_window(xwm, requested_focus);
} else { } else {
xwm_set_focus_window(xwm, xwm->focus_surface); xwm_set_focus_window(xwm, xwm->focus_surface);