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xwm: prevent X11 clients from blowing our stack by opening too many windows

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Allocate window arrays for list property updates on the heap instead.
This commit is contained in:
Tudor Brindus 2021-05-19 20:48:18 -04:00 committed by Simon Ser
parent ae2f3ecb68
commit 6605d7c390
1 changed files with 11 additions and 2 deletions
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13
xwayland/xwm.c
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@ -237,7 +237,11 @@ static void xwm_set_net_client_list(struct wlr_xwm *xwm) {
} }
} }
xcb_window_t windows[mapped_surfaces + 1]; xcb_window_t *windows = malloc(sizeof(xcb_window_t) * mapped_surfaces);
if (!windows) {
return;
}
size_t index = 0; size_t index = 0;
wl_list_for_each(surface, &xwm->surfaces, link) { wl_list_for_each(surface, &xwm->surfaces, link) {
if (surface->mapped) { if (surface->mapped) {
@ -248,11 +252,15 @@ static void xwm_set_net_client_list(struct wlr_xwm *xwm) {
xcb_change_property(xwm->xcb_conn, XCB_PROP_MODE_REPLACE, xcb_change_property(xwm->xcb_conn, XCB_PROP_MODE_REPLACE,
xwm->screen->root, xwm->atoms[NET_CLIENT_LIST], xwm->screen->root, xwm->atoms[NET_CLIENT_LIST],
XCB_ATOM_WINDOW, 32, mapped_surfaces, windows); XCB_ATOM_WINDOW, 32, mapped_surfaces, windows);
free(windows);
} }
static void xwm_set_net_client_list_stacking(struct wlr_xwm *xwm) { static void xwm_set_net_client_list_stacking(struct wlr_xwm *xwm) {
size_t num_surfaces = wl_list_length(&xwm->surfaces_in_stack_order); size_t num_surfaces = wl_list_length(&xwm->surfaces_in_stack_order);
xcb_window_t windows[num_surfaces + 1]; xcb_window_t *windows = malloc(sizeof(xcb_window_t) * num_surfaces);
if (!windows) {
return;
}
// We store surfaces in top-to-bottom order because this is easier to reason // We store surfaces in top-to-bottom order because this is easier to reason
// about, but _NET_CLIENT_LIST_STACKING is supposed to be in bottom-to-top // about, but _NET_CLIENT_LIST_STACKING is supposed to be in bottom-to-top
@ -266,6 +274,7 @@ static void xwm_set_net_client_list_stacking(struct wlr_xwm *xwm) {
xcb_change_property(xwm->xcb_conn, XCB_PROP_MODE_REPLACE, xwm->screen->root, xcb_change_property(xwm->xcb_conn, XCB_PROP_MODE_REPLACE, xwm->screen->root,
xwm->atoms[NET_CLIENT_LIST_STACKING], XCB_ATOM_WINDOW, 32, num_surfaces, xwm->atoms[NET_CLIENT_LIST_STACKING], XCB_ATOM_WINDOW, 32, num_surfaces,
windows); windows);
free(windows);
} }
static void xsurface_set_net_wm_state(struct wlr_xwayland_surface *xsurface); static void xsurface_set_net_wm_state(struct wlr_xwayland_surface *xsurface);